Repository: betrusted-io/xous-core (language: python)

Issue:
x25519 vectors
Might be a good idea to port these into Xous and check the implementation against this set of vectors:

https://github.com/google/wycheproof/blob/master/testvectors/x25519_test.json

x25519 vectors
Might be a good idea to port these into Xous and check the implementation against this set of vectors:

https://github.com/google/wycheproof/blob/master/testvectors/x25519_test.json



Discussion / hints:
I'd like to work on this issue and thought about implementing it this way:

* Add a new binary crate `wycheproof-import` with code to parse the test vectors and put them into a file `wycheproof_vectors.bin`.
    * Add the `x25519_test.json` to the crate for easy reproducibility and explicit versioning.
    * Potentially, only considering the `public`, `private` and `shared` fields of each test vector is sufficient since the result is always either `valid` or `acceptable`.
* Add a `wycheproof` subcommand to the `engine` `shellchat` command that runs the vectors using the methods from `x25519_dalek::{StaticSecret, PublicKey}` and reports the results as a summary.

Would that work for you? In particular, I was wondering if another `*.bin` file can be included without breaking something or using too much memory. If only the fields mentioned above were used, the file would contain 518 * 96 bytes.
Hello! Thank you for having a look at this. The good news is that @xobs has a port of engine25519 working in Renode, so you may even be able to emulate your solution to see if it works without the need for real hardware.

I think your approach works well. Overall, it makes sense to just include the vectors as a .bin file as long as there is a way to do that without having to invoke nightly Rust (iirc it's possible to do in stable, but I can't recall how it's done off the top of my head); alternatively, you could do something like an autogenerated Rust module that compiles into some static variables that can be accessed later on. This is the approach that was taken in absorbing the database of FPGA frames to patch for key injection into the bitstream: https://github.com/betrusted-io/xous-core/tree/main/services/root-keys/src/key2bits; there's a Python file that reads in the database and spits out an included .rs file. The main advantage of that approach is that the binary data gets type annotations around it without having to do some `unsafe` cast of a raw chunk of data to a slice or other structure. The main disadvantage is it takes forever for the linker to process big static structures like this.

I don't have a strong opinion either way; as long as it's all done with stable features, casting a repr-C struct onto a binary blob with an unsafe operation to conjure test vectors like this feels like no big deal. If there is a correctness issue resulting from the unsafe operation it'd fall out in the actual x25519 tests failing, and it won't have a domino impact on the correctness of other systems.

From the memory usage standpoint, 50kiB of extra RAM dedicated to the test routine is not going to break the system. We're currently using about 6.7MiB out of 16MiB available RAM space (and all code is copied into RAM right now before being run). Eventually, we'll make deep diagnostic tests like this a "feature" option so we can save on code space, but for now we have enough memory space to carry all the test frameworks.

If you have any questions on how to get Redone running or how to navigate the code base, we welcome them. We're still figuring out what needs to be better documented to make the on-boarding process less painful. 
Thanks for the detailed feedback, it's much appreciated!

I think I found a way to use a .bin file without the need for nightly features by adapting what you were already doing with `engine25519_vectors.bin`. It will need some polishing but should be ready soon.

So far, I did not have any problems getting Xous running on Renode or navigating the code base. However, I was just gathering information for a bug report when @xobs  latest commits unbroke the system for me. Hosted mode worked fine, so I was able to play around a bit. Can't wait to see the hardware go into production. :)
I'd like to work on this issue and thought about implementing it this way:

* Add a new binary crate `wycheproof-import` with code to parse the test vectors and put them into a file `wycheproof_vectors.bin`.
    * Add the `x25519_test.json` to the crate for easy reproducibility and explicit versioning.
    * Potentially, only considering the `public`, `private` and `shared` fields of each test vector is sufficient since the result is always either `valid` or `acceptable`.
* Add a `wycheproof` subcommand to the `engine` `shellchat` command that runs the vectors using the methods from `x25519_dalek::{StaticSecret, PublicKey}` and reports the results as a summary.

Would that work for you? In particular, I was wondering if another `*.bin` file can be included without breaking something or using too much memory. If only the fields mentioned above were used, the file would contain 518 * 96 bytes.
Hello! Thank you for having a look at this. The good news is that @xobs has a port of engine25519 working in Renode, so you may even be able to emulate your solution to see if it works without the need for real hardware.

I think your approach works well. Overall, it makes sense to just include the vectors as a .bin file as long as there is a way to do that without having to invoke nightly Rust (iirc it's possible to do in stable, but I can't recall how it's done off the top of my head); alternatively, you could do something like an autogenerated Rust module that compiles into some static variables that can be accessed later on. This is the approach that was taken in absorbing the database of FPGA frames to patch for key injection into the bitstream: https://github.com/betrusted-io/xous-core/tree/main/services/root-keys/src/key2bits; there's a Python file that reads in the database and spits out an included .rs file. The main advantage of that approach is that the binary data gets type annotations around it without having to do some `unsafe` cast of a raw chunk of data to a slice or other structure. The main disadvantage is it takes forever for the linker to process big static structures like this.

I don't have a strong opinion either way; as long as it's all done with stable features, casting a repr-C struct onto a binary blob with an unsafe operation to conjure test vectors like this feels like no big deal. If there is a correctness issue resulting from the unsafe operation it'd fall out in the actual x25519 tests failing, and it won't have a domino impact on the correctness of other systems.

From the memory usage standpoint, 50kiB of extra RAM dedicated to the test routine is not going to break the system. We're currently using about 6.7MiB out of 16MiB available RAM space (and all code is copied into RAM right now before being run). Eventually, we'll make deep diagnostic tests like this a "feature" option so we can save on code space, but for now we have enough memory space to carry all the test frameworks.

If you have any questions on how to get Redone running or how to navigate the code base, we welcome them. We're still figuring out what needs to be better documented to make the on-boarding process less painful. 
Thanks for the detailed feedback, it's much appreciated!

I think I found a way to use a .bin file without the need for nightly features by adapting what you were already doing with `engine25519_vectors.bin`. It will need some polishing but should be ready soon.

So far, I did not have any problems getting Xous running on Renode or navigating the code base. However, I was just gathering information for a bug report when @xobs  latest commits unbroke the system for me. Hosted mode worked fine, so I was able to play around a bit. Can't wait to see the hardware go into production. :)

Fix patch:
diff --git a/Cargo.lock b/Cargo.lock
index 825e1b156..ab5fbcb9b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -61,9 +61,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.38"
+version = "1.0.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afddf7f520a80dbf76e6f50a35bca42a2331ef227a28b3b6dc5c2e2338d114b1"
+checksum = "28ae2b3dec75a406790005a200b1bd89785afc02517a00ca99ecfe093ee9e6cf"
 
 [[package]]
 name = "atty"
@@ -372,7 +372,7 @@ dependencies = [
  "ansi_term",
  "atty",
  "bitflags",
- "strsim",
+ "strsim 0.8.0",
  "textwrap",
  "unicode-width",
  "vec_map",
@@ -557,6 +557,41 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "darling"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "757c0ded2af11d8e739c4daea1ac623dd1624b06c844cf3f5a39f1bdbd99bb12"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c34d8efb62d0c2d7f60ece80f75e5c63c1588ba68032740494b0b9a996466e3"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim 0.10.0",
+ "syn",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ade7bff147130fe5e6d39f089c6bd49ec0250f35d70b2eebf72afdfc919f15cc"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "debug-here"
 version = "0.2.2"
@@ -676,6 +711,16 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "eyre"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "221239d1d5ea86bf5d6f91c9d6bc3646ffe471b08ff9b0f91c44f115ac969d2b"
+dependencies = [
+ "indenter",
+ "once_cell",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.8"
@@ -709,6 +754,12 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "gam"
 version = "0.1.0"
@@ -844,6 +895,12 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
 [[package]]
 name = "ime-frontend"
 version = "0.1.0"
@@ -897,6 +954,12 @@ dependencies = [
  "xous-names",
 ]
 
+[[package]]
+name = "indenter"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
+
 [[package]]
 name = "itoa"
 version = "0.4.7"
@@ -1247,9 +1310,9 @@ checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.24"
+version = "1.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+checksum = "5c7ed8b8c7b886ea3ed7dde405212185f423ab44682667c8c6dd14aa1d9f6612"
 dependencies = [
  "unicode-xid",
 ]
@@ -1291,9 +1354,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.8"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
+checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
 dependencies = [
  "proc-macro2",
 ]
@@ -1612,6 +1675,12 @@ dependencies = [
  "semver",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61b3909d758bb75c79f23d4736fac9433868679d3ad2ea7a61e3c25cfda9a088"
+
 [[package]]
 name = "ryu"
 version = "1.0.5"
@@ -1664,9 +1733,23 @@ checksum = "568a8e6258aa33c13358f81fd834adb854c6f7c9468520910a9b1e8fac068012"
 
 [[package]]
 name = "serde"
-version = "1.0.123"
+version = "1.0.129"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1f72836d2aa753853178eda473a3b9d8e4eefdaf20523b919677e6de489f8f1"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.129"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92d5161132722baa40d802cc70b15262b98258453e85e5d1d365c757c73869ae"
+checksum = "e57ae87ad533d9a56427558b516d0adac283614e347abf85b0dc0cbbf0a249f3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
 
 [[package]]
 name = "serde_json"
@@ -1679,6 +1762,30 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_with"
+version = "1.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ad9fdbb69badc8916db738c25efd04f0a65297d26c2f8de4b62e57b8c12bc72"
+dependencies = [
+ "hex",
+ "rustversion",
+ "serde",
+ "serde_with_macros",
+]
+
+[[package]]
+name = "serde_with_macros"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1569374bd54623ec8bd592cf22ba6e03c0f177ff55fbc8c29a49e296e7adecf"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "sha2"
 version = "0.9.5"
@@ -1833,6 +1940,12 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
 [[package]]
 name = "subtle"
 version = "2.4.0"
@@ -1876,9 +1989,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.67"
+version = "1.0.75"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6498a9efc342871f91cc2d0d694c674368b4ceb40f62b65a7a08c3792935e702"
+checksum = "b7f58f7e8eaa0009c5fec437aabf511bd9933e4b2d7407bd05273c01a8906ea7"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2308,6 +2421,16 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "wycheproof-import"
+version = "0.1.0"
+dependencies = [
+ "eyre",
+ "serde",
+ "serde_json",
+ "serde_with",
+]
+
 [[package]]
 name = "x11-dl"
 version = "2.18.5"
diff --git a/Cargo.toml b/Cargo.toml
index 8b76bd480..6d5907e7e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -77,6 +77,7 @@ members = [
   "services/spinor",
   "services/root-keys",
   "services/jtag",
+  "wycheproof-import",
 ]
 resolver = "2"
 
diff --git a/services/shellchat/src/cmds/engine.rs b/services/shellchat/src/cmds/engine.rs
index 5d1b4a45a..d96c1ffe6 100644
--- a/services/shellchat/src/cmds/engine.rs
+++ b/services/shellchat/src/cmds/engine.rs
@@ -205,12 +205,77 @@ pub fn benchmark_thread(sid0: usize, sid1: usize, sid2: usize, sid3: usize) {
     xous::destroy_server(sid).unwrap();
 }
 
+mod wycheproof {
+    pub const WYCHEPROOF_NO_TEST_CASES: usize = 518;
+    pub const WHYCHEPROOF_TEST_CASE_SIZE: usize = 96;
+
+    #[export_name = "wycheproof_vectors"]
+    pub static WYCHEPROOF_VECTORS: &[u8; WYCHEPROOF_NO_TEST_CASES * WHYCHEPROOF_TEST_CASE_SIZE] =
+        include_bytes!("x25519_test.bin");
+
+    pub struct WycheproofTestCase {
+        // inferred from the index; not read from the binary data
+        public: [u8; 32],
+        id: usize,
+        private: [u8; 32],
+        shared: [u8; 32],
+    }
+
+    impl WycheproofTestCase {
+        pub fn read(test_index: usize) -> Self {
+            use std::io::Read;
+            let test_offset = test_index * WHYCHEPROOF_TEST_CASE_SIZE;
+            let mut public = [0u8; 32];
+            (&WYCHEPROOF_VECTORS[test_offset..test_offset + 32])
+                .read_exact(&mut public)
+                .unwrap();
+            let mut private = [0u8; 32];
+            (&WYCHEPROOF_VECTORS[test_offset + 32..test_offset + 64])
+                .read_exact(&mut private)
+                .unwrap();
+            let mut shared = [0u8; 32];
+            (&WYCHEPROOF_VECTORS[test_offset + 64..test_offset + 96])
+                .read_exact(&mut shared)
+                .unwrap();
+
+            WycheproofTestCase {
+                id: test_index + 1,
+                public,
+                private,
+                shared,
+            }
+        }
+
+        pub fn run(&self) -> Option<TestCaseError> {
+            use x25519_dalek::{PublicKey, StaticSecret};
+            let private = StaticSecret::from(self.private);
+            let public = PublicKey::from(self.public);
+            let shared = private.diffie_hellman(&public).to_bytes();
+            if shared != self.shared {
+                Some(TestCaseError {
+                    test_id: self.id,
+                    expected: self.shared,
+                    actual: shared,
+                })
+            } else {
+                None
+            }
+        }
+    }
+
+    pub struct TestCaseError {
+        pub(crate) test_id: usize,
+        pub(crate) expected: [u8; 32],
+        pub(crate) actual: [u8; 32],
+    }
+}
 #[derive(Debug)]
 pub struct Engine {
     susres: susres::Susres,
     benchmark_cid: xous::CID,
     start_time: Option<u64>,
 }
+
 impl Engine {
     pub fn new(xns: &xous_names::XousNames, env: &mut CommonEnv) -> Self {
         let sid = xous::create_server().unwrap();
@@ -449,6 +514,22 @@ impl<'a> ShellCmdApi<'a> for Engine {
                         write!(ret, "Passed ed25519 simple check").unwrap();
                     }
                 }
+                "wycheproof" => {
+                    use wycheproof::*;
+                    use hex::ToHex;
+                    let failures: Vec<TestCaseError> = (0..WYCHEPROOF_NO_TEST_CASES)
+                        .filter_map(|test_index| WycheproofTestCase::read(test_index).run())
+                        .collect();
+                    write!(ret, "Ran {} tests. {} failures.", WYCHEPROOF_NO_TEST_CASES, failures.len()).unwrap();
+                    if failures.len() > 0 {
+                        write!(ret, "\nFailed tests: {:?}", failures.iter().map(|tc| tc.test_id).collect::<Vec<usize>>()).unwrap();
+                        for failure in failures {
+                            log::error!("wycheproof test #{} failed:", failure.test_id);
+                            log::error!("expected: {}", failure.expected.encode_hex::<std::string::String>());
+                            log::error!("actual:   {}", failure.actual.encode_hex::<std::string::String>());
+                        }
+                    }
+                }
                 _ => {
                     write!(ret, "{}", helpstring).unwrap();
                 }
diff --git a/wycheproof-import/Cargo.toml b/wycheproof-import/Cargo.toml
new file mode 100644
index 000000000..7f17a8819
--- /dev/null
+++ b/wycheproof-import/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "wycheproof-import"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+eyre = "0.6.5"
+serde = { version = "1.0.129", features = ["derive"] }
+serde_json = "1.0.66"
+serde_with = { version = "1.9.4", features = ["hex"] }
diff --git a/wycheproof-import/README.md b/wycheproof-import/README.md
new file mode 100644
index 000000000..292c677c6
--- /dev/null
+++ b/wycheproof-import/README.md
@@ -0,0 +1,20 @@
+# Wycheproof x25519 Test Vectors
+
+This package contains code to make the Diffie-Hellman Key exchange test vectors for Curve25519
+from [Project Wycheproof](https://github.com/google/wycheproof) usable for Xous.
+
+Project Wycheproof is published under the [Apache-2.0 License](../LICENSES/Apache-2.0.txt). The
+file [x25519_test.json](x25519_test.json) was imported from Project Wycheproof. See the newest corresponding commit
+message to map the local file to the upstream file's version. A subset of the information therein is compiled to binary
+using this package.
+
+## Usage
+
+The repository contains the precompiled test vectors. To run them, use the `engine wycheproof` command when running on
+Renode or on real hardware.
+
+### (Re-)compiling the test vectors
+
+Run `cargo xtask wychproof-import` in order to compile the test cases in `wycheproof-import/x25519_test.json`
+to `services/shellchat/src/cmds/x25519_test.bin` which will be included when compiling
+the `services/shellchat/src/cmds/engine.rs`. The `xtask` command runs the local binary crate with the proper arguments.
diff --git a/wycheproof-import/src/main.rs b/wycheproof-import/src/main.rs
new file mode 100644
index 000000000..edd271b63
--- /dev/null
+++ b/wycheproof-import/src/main.rs
@@ -0,0 +1,75 @@
+use std::env;
+use std::io::Write;
+use std::ops::AddAssign;
+use std::path::Path;
+use std::process::exit;
+
+use eyre::{bail, Result, WrapErr};
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+struct TestData {
+    #[serde(rename(deserialize = "testGroups"))]
+    test_groups: Vec<TestGroup>,
+}
+
+#[derive(Deserialize)]
+struct TestGroup {
+    tests: Vec<TestCase>,
+}
+
+#[serde_with::serde_as]
+#[derive(Debug, Deserialize)]
+struct TestCase {
+    #[serde(rename(deserialize = "tcId"))]
+    id: usize,
+    #[serde_as(as = "serde_with::hex::Hex")]
+    public: [u8; 32],
+    #[serde_as(as = "serde_with::hex::Hex")]
+    private: [u8; 32],
+    #[serde_as(as = "serde_with::hex::Hex")]
+    shared: [u8; 32],
+    result: String,
+}
+
+fn main() -> Result<()> {
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 3 {
+        println!("usage: wycheproof-import <input.json> <output.bin>");
+        exit(0);
+    }
+    let input_file_path = Path::new(&args[1]);
+    let output_file_path = Path::new(&args[2]);
+
+    let test_data = std::fs::read_to_string(input_file_path).wrap_err(format!(
+        "Could not read test data from '{}'",
+        input_file_path.to_string_lossy()
+    ))?;
+    let test_data: TestData =
+        serde_json::from_str(&test_data).wrap_err("Error parsing test vectors")?;
+
+    let expected_results = vec!["valid".to_string(), "acceptable".to_string()];
+    let mut output_file = std::fs::File::create(output_file_path).wrap_err(format!(
+        "Error creating output file '{}'",
+        output_file_path.to_string_lossy()
+    ))?;
+    let mut last_id = 0;
+
+    for test_case in &test_data.test_groups[0].tests {
+        if test_case.id != last_id + 1 {
+            bail!("Expect test cases to be continuously ascending. Expected next tcId to be {}, was {}", last_id + 1, test_case.id)
+        }
+        if !expected_results.contains(&test_case.result) {
+            bail!(
+                "Expect test case results to be one of {:?}",
+                expected_results
+            );
+        }
+        last_id.add_assign(1);
+
+        output_file.write_all(&test_case.public)?;
+        output_file.write_all(&test_case.private)?;
+        output_file.write_all(&test_case.shared)?;
+    }
+    Ok(())
+}
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index 0bbbf0cf3..8ab83f3f7 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -193,6 +193,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         Some("nuke-soc") => update_usb(false, false, true, false)?,
         Some("burn-soc") => update_usb(false, false, false, true)?,
         Some("generate-locales") => generate_locales()?,
+        Some("wycheproof-import") => whycheproof_import()?,
         _ => print_help(),
     }
     Ok(())
@@ -221,6 +222,7 @@ burn-loader             invoke the `usb_update.py` utility to burn the loader
 burn-soc                invoke the `usb_update.py` utility to stage the SoC gateware, which must then be provisioned with secret material using the Precursor device.
 nuke-soc                'Factory reset' - invoke the `usb_update.py` utility to burn the SoC gateware, erasing most secrets. For developers.
 generate-locales        only generate the locales include for the language selected in xous-rs/src/locale.rs
+wycheproof-import       generate binary test vectors for engine-25519 from whycheproof-import/x25519.json
 
 Please refer to tools/README_UPDATE.md for instructions on how to set up `usb_update.py`
 "
@@ -875,6 +877,30 @@ fn generate_locales() -> Result<(), std::io::Error> {
     filetime::set_file_mtime("locales/src/lib.rs", ts)
 }
 
+fn whycheproof_import() -> Result<(), DynError> {
+    let input_file = "wycheproof-import/x25519_test.json";
+    let output_file = "services/shellchat/src/cmds/x25519_test.bin";
+    let status = Command::new(cargo())
+        .current_dir(project_root())
+        .args(&[
+            "run",
+            "--package",
+            "wycheproof-import",
+            "--",
+            input_file,
+            output_file
+        ])
+        .status()?;
+    if !status.success() {
+        return Err("wycheproof-import failed. If any, the output will not be usable.".into());
+    }
+
+    println!();
+    println!("Wrote wycheproof x25519 testvectors to '{}'.", output_file);
+
+    return Ok(())
+}
+
 // fn dist_dir() -> PathBuf {
 //     project_root().join("target/dist")
 // }


Test patch:
diff --git a/services/shellchat/src/cmds/x25519_test.bin b/services/shellchat/src/cmds/x25519_test.bin
new file mode 100644
index 000000000..b92cca6e0
Binary files /dev/null and b/services/shellchat/src/cmds/x25519_test.bin differ
diff --git a/wycheproof-import/x25519_test.json b/wycheproof-import/x25519_test.json
new file mode 100644
index 000000000..431b434bd
--- /dev/null
+++ b/wycheproof-import/x25519_test.json
@@ -0,0 +1,5248 @@
+{
+  "algorithm" : "XDH",
+  "generatorVersion" : "0.8r12",
+  "numberOfTests" : 518,
+  "header" : [
+    "Test vectors of type XdhComp are intended for tests that verify the",
+    "computation of and Xdh key exchange."
+  ],
+  "notes" : {
+    "LowOrderPublic" : "The curves and its twists contain some points of low order. This test vector contains a public key with such a point. While many libraries reject such public keys, doing so is not a strict requirement according to RFC 7748.",
+    "NonCanonicalPublic" : "The public key is in non-canonical form. RFC 7749, section 5 defines the value that this public key represents. Section 7 of the same RFC recommends accepting such keys. If a non-canonical key is accepted then it must follow the RFC.",
+    "SmallPublicKey" : "The public key is insecure and does not belong to a valid private key. Some libraries reject such keys.",
+    "Twist" : "Public keys are either points on a given curve or points on its twist. The functions X25519 and X448 are defined for points on a twist with the goal that the output of computations do not leak private keys. Implementations may accept or reject points on a twist. If a point multiplication is performed then it is important that the result is correct, since otherwise attacks with invalid keys are possible.",
+    "ZeroSharedSecret" : "Some libraries include a check that the shared secret is not all-zero. This check is described in Section 6.1 of RFC 7748. "
+  },
+  "schema" : "xdh_comp_schema.json",
+  "testGroups" : [
+    {
+      "curve" : "curve25519",
+      "type" : "XdhComp",
+      "tests" : [
+        {
+          "tcId" : 1,
+          "comment" : "normal case",
+          "public" : "504a36999f489cd2fdbc08baff3d88fa00569ba986cba22548ffde80f9806829",
+          "private" : "c8a9d5a91091ad851c668b0736c1c9a02936c0d3ad62670858088047ba057475",
+          "shared" : "436a2c040cf45fea9b29a0cb81b1f41458f863d0d61b453d0a982720d6d61320",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 2,
+          "comment" : "public key on twist",
+          "public" : "63aa40c6e38346c5caf23a6df0a5e6c80889a08647e551b3563449befcfc9733",
+          "private" : "d85d8c061a50804ac488ad774ac716c3f5ba714b2712e048491379a500211958",
+          "shared" : "279df67a7c4611db4708a0e8282b195e5ac0ed6f4b2f292c6fbd0acac30d1332",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 3,
+          "comment" : "public key on twist",
+          "public" : "0f83c36fded9d32fadf4efa3ae93a90bb5cfa66893bc412c43fa7287dbb99779",
+          "private" : "c8b45bfd32e55325d9fd648cb302848039000b390e44d521e58aab3b29a6964b",
+          "shared" : "4bc7e01e7d83d6cf67632bf90033487a5fc29eba5328890ea7b1026d23b9a45f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 4,
+          "comment" : "public key on twist",
+          "public" : "0b8211a2b6049097f6871c6c052d3c5fc1ba17da9e32ae458403b05bb283092a",
+          "private" : "f876e34bcbe1f47fbc0fddfd7c1e1aa53d57bfe0f66d243067b424bb6210be51",
+          "shared" : "119d37ed4b109cbd6418b1f28dea83c836c844715cdf98a3a8c362191debd514",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 5,
+          "comment" : "public key on twist",
+          "public" : "343ac20a3b9c6a27b1008176509ad30735856ec1c8d8fcae13912d08d152f46c",
+          "private" : "006ac1f3a653a4cdb1d37bba94738f8b957a57beb24d646e994dc29a276aad45",
+          "shared" : "cc4873aed3fcee4b3aaea7f0d20716b4276359081f634b7bea4b705bfc8a4d3e",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 6,
+          "comment" : "public key on twist",
+          "public" : "fa695fc7be8d1be5bf704898f388c452bafdd3b8eae805f8681a8d15c2d4e142",
+          "private" : "08da77b26d06dff9d9f7fd4c5b3769f8cdd5b30516a5ab806be324ff3eb69e60",
+          "shared" : "b6f8e2fcb1affc79e2ff798319b2701139b95ad6dd07f05cbac78bd83edfd92e",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 7,
+          "comment" : "public key on twist",
+          "public" : "0200000000000000000000000000000000000000000000000000000000000000",
+          "private" : "d03edde9f3e7b799045f9ac3793d4a9277dadeadc41bec0290f81f744f73775f",
+          "shared" : "b87a1722cc6c1e2feecb54e97abd5a22acc27616f78f6e315fd2b73d9f221e57",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 8,
+          "comment" : "public key on twist",
+          "public" : "0300000000000000000000000000000000000000000000000000000000000000",
+          "private" : "e09d57a914e3c29036fd9a442ba526b5cdcdf28216153e636c10677acab6bd6a",
+          "shared" : "a29d8dad28d590cd3017aa97a4761f851bf1d3672b042a4256a45881e2ad9035",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 9,
+          "comment" : "public key on twist",
+          "public" : "ff00000000000000000000000000000000000000000000000000000000000000",
+          "private" : "e0ed78e6ee02f08bec1c15d66fbbe5b83ffc37ea14e1512cc1bd4b2ea6d8066f",
+          "shared" : "e703bc8aa94b7d87ba34e2678353d12cdaaa1a97b5ca3e1b8c060c4636087f07",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 10,
+          "comment" : "public key on twist",
+          "public" : "ffff000000000000000000000000000000000000000000000000000000000000",
+          "private" : "a8a1a2ec9fa9915ae7aace6a37c68591d39e15995c4ef5ebd3561c02f72dda41",
+          "shared" : "ff5cf041e924dbe1a64ac9bdba96bdcdfaf7d59d91c7e33e76ed0e4c8c836446",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 11,
+          "comment" : "public key on twist",
+          "public" : "0000010000000000000000000000000000000000000000000000000000000000",
+          "private" : "a8c9df5820eb399d471dfa3215d96055b3c7d0f4ea49f8ab028d6a6e3194517b",
+          "shared" : "a92a96fa029960f9530e6fe37e2429cd113be4d8f3f4431f8546e6c76351475d",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 12,
+          "comment" : "public key on twist",
+          "public" : "ffffff0f00000000000000000000000000000000000000000000000000000000",
+          "private" : "d0d31c491cbd39271859b4a63a316826507b1db8c701709fd0ffe3eb21c4467c",
+          "shared" : "9f8954868158ec62b6b586b8cae1d67d1b9f4c03d5b3ca0393cee71accc9ab65",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 13,
+          "comment" : "public key on twist",
+          "public" : "ffffffff00000000000000000000000000000000000000000000000000000000",
+          "private" : "d053e7bf1902619cd61c9c739e09d54c4147f46d190720966f7de1d9cffbbd4e",
+          "shared" : "6cbf1dc9af97bc148513a18be4a257de1a3b065584df94e8b43c1ab89720b110",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 14,
+          "comment" : "public key on twist",
+          "public" : "0000000000001000000000000000000000000000000000000000000000000000",
+          "private" : "a021d75009a4596e5a33f12921c10f3670933bc80dde3bba22881b6120582144",
+          "shared" : "38284b7086095a9406028c1f800c071ea106039ad7a1d7f82fe00906fd90594b",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 15,
+          "comment" : "public key on twist",
+          "public" : "0000000000000001000000000000000000000000000000000000000000000000",
+          "private" : "a89c6687f99bd569a01fd8bd438236160d15ce2c57c1d71ebaa3f2da88233863",
+          "shared" : "c721041df0244071794a8db06b9f7eaeec690c257265343666f4416f4166840f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 16,
+          "comment" : "public key on twist",
+          "public" : "ffffffffffffffff000000000000000000000000000000000000000000000000",
+          "private" : "68964bca51465bf0f5ba524b1482ceff0e960a1ed9f48dcc30f1608d0e501a50",
+          "shared" : "25ff9a6631b143dbdbdc207b38e38f832ae079a52a618c534322e77345fd9049",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 17,
+          "comment" : "public key on twist",
+          "public" : "0000000000000000000000000000000000000000000000000100000000000000",
+          "private" : "a8e56bb13a9f2b33b8e6750b4a6e6621dc26ae8c5c624a0992c8f0d5b910f170",
+          "shared" : "f294e7922c6cea587aefe72911630d50f2456a2ba7f21207d57f1ecce04f6213",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 18,
+          "comment" : "public key on twist",
+          "public" : "ffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000",
+          "private" : "e045f55c159451e97814d747050fd7769bd478434a01876a56e553f66384a74c",
+          "shared" : "ff4715bd8cf847b77c244ce2d9b008b19efaa8e845feb85ce4889b5b2c6a4b4d",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 19,
+          "comment" : "public key on twist",
+          "public" : "ffffff030000f8ffff1f0000c0ffffff000000feffff070000f0ffff3f000000",
+          "private" : "105d621e1ef339c3d99245cfb77cd3a5bd0c4427a0e4d8752c3b51f045889b4f",
+          "shared" : "61eace52da5f5ecefafa4f199b077ff64f2e3d2a6ece6f8ec0497826b212ef5f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 20,
+          "comment" : "public key on twist",
+          "public" : "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f0000",
+          "private" : "d88a441e706f606ae7f630f8b21f3c2554739e3e549f804118c03771f608017b",
+          "shared" : "ff1b509a0a1a54726086f1e1c0acf040ab463a2a542e5d54e92c6df8126cf636",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 21,
+          "comment" : "public key on twist",
+          "public" : "0000000000000000000000000000000000000000000000000000000000800000",
+          "private" : "80bbad168222276200aafd36f7f25fdc025632d8bf9f6354bb762e06fb63e250",
+          "shared" : "f134e6267bf93903085117b99932cc0c7ba26f25fca12102a26d7533d9c4272a",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 22,
+          "comment" : "public key on twist",
+          "public" : "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff1f",
+          "private" : "68e134092e94e622c8a0cd18aff55be23dabd994ebdee982d90601f6f0f4b369",
+          "shared" : "74bfc15e5597e9f5193f941e10a5c008fc89f051392723886a4a8fe5093a7354",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 23,
+          "comment" : "public key on twist",
+          "public" : "0000000000000000000000000000000000000000000000000000000000000020",
+          "private" : "e8e43fc1ebac0bbc9b99c8035ee1ac59b90f19a16c42c0b90f96adfcc5fdee78",
+          "shared" : "0d41a5b3af770bf2fcd34ff7972243a0e2cf4d34f2046a144581ae1ec68df03b",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 24,
+          "comment" : "public key on twist",
+          "public" : "000000fcffff070000e0ffff3f000000ffffff010000f8ffff0f0000c0ffff7f",
+          "private" : "18bffb16f92680a9e267473e43c464476d5372ddd1f664f3d0678efe7c98bc79",
+          "shared" : "5894e0963583ae14a0b80420894167f4b759c8d2eb9b69cb675543f66510f646",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 25,
+          "comment" : "public key on twist",
+          "public" : "ffffffffffffff00000000000000ffffffffffffff00000000000000ffffff7f",
+          "private" : "300305eb002bf86c71fe9c0b311993727b9dc618d0ce7251d0dfd8552d17905d",
+          "shared" : "f8624d6e35e6c548ac47832f2e5d151a8e53b9290363b28d2ab8d84ab7cb6a72",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 26,
+          "comment" : "public key on twist",
+          "public" : "00000000ffffffff00000000ffffffff00000000ffffffff00000000ffffff7f",
+          "private" : "80da9f02842247d4ade5ddbac51dbce55ea7dca2844e7f97ab8987ce7fd8bc71",
+          "shared" : "bfe183ba3d4157a7b53ef178613db619e27800f85359c0b39a9fd6e32152c208",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 27,
+          "comment" : "public key on twist",
+          "public" : "edfffffffffffffffffffffffffffeffffffffffffffffffffffffffffffff7f",
+          "private" : "806e7f26ca3246de8182946cbed09f52b95da626c823c7b50450001a47b7b252",
+          "shared" : "bca4a0724f5c1feb184078448c898c8620e7caf81f64cca746f557dff2498859",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 28,
+          "comment" : "public key on twist",
+          "public" : "edfffffffffffffeffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "58354fd64bc022cba3a71b2ae64281e4ea7bf6d65fdbaead1440eeb18604fe62",
+          "shared" : "b3418a52464c15ab0cacbbd43887a1199206d59229ced49202300638d7a40f04",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 29,
+          "comment" : "public key on twist",
+          "public" : "edffffffffffefffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "f0019cf05159794cc8052b00c2e75b7f46fb6693c4b38c02b12a4fe272e8556a",
+          "shared" : "fcde6e0a3d5fd5b63f10c2d3aad4efa05196f26bc0cb26fd6d9d3bd015eaa74f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 30,
+          "comment" : "public key on twist",
+          "public" : "edfeffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "d0fca64cc5f3a0c8e75c824e8b09d1615aa79aeba139bb7302e2bb2fcbe54b40",
+          "shared" : "7d62f189444c6231a48afab10a0af2eee4a52e431ea05ff781d616af2114672f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 31,
+          "comment" : "public key on twist",
+          "public" : "eaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "d02456e456911d3c6cd054933199807732dfdc958642ad1aebe900c793bef24a",
+          "shared" : "07ba5fcbda21a9a17845c401492b10e6de0a168d5c94b606694c11bac39bea41",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 32,
+          "comment" : "public key = 0",
+          "public" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "private" : "88227494038f2bb811d47805bcdf04a2ac585ada7f2f23389bfd4658f9ddd45e",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 33,
+          "comment" : "public key = 1",
+          "public" : "0100000000000000000000000000000000000000000000000000000000000000",
+          "private" : "48232e8972b61c7e61930eb9450b5070eae1c670475685541f0476217e48184f",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 34,
+          "comment" : "edge case public key",
+          "public" : "0400000000000000000000000000000000000000000000000000000000000000",
+          "private" : "a8386f7f16c50731d64f82e6a170b142a4e34f31fd7768fcb8902925e7d1e25a",
+          "shared" : "34b7e4fa53264420d9f943d15513902342b386b172a0b0b7c8b8f2dd3d669f59",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 35,
+          "comment" : "edge case public key",
+          "public" : "0001000000000000000000000000000000000000000000000000000000000000",
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+            "ZeroSharedSecret"
+          ]
+        },
+        {
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+            "LowOrderPublic",
+            "ZeroSharedSecret"
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+        },
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+          "flags" : [
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
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+        {
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+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
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+          "comment" : "public key with low order",
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+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 82,
+          "comment" : "public key with low order",
+          "public" : "eeffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+          "private" : "786a33a4f7af297a20e7642925932bf509e7070fa1bc36986af1eb13f4f50b55",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 83,
+          "comment" : "public key = 57896044618658097711785492504343953926634992332820282019728792003956564819949",
+          "public" : "edffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "40ff586e73d61f0960dc2d763ac19e98225f1194f6fe43d5dd97ad55b3d35961",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 84,
+          "comment" : "public key = 57896044618658097711785492504343953926634992332820282019728792003956564819950",
+          "public" : "eeffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "584fceaebae944bfe93b2e0d0a575f706ce5ada1da2b1311c3b421f9186c7a6f",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "NonCanonicalPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 85,
+          "comment" : "non-canonical public key",
+          "public" : "efffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "0016b62af5cabde8c40938ebf2108e05d27fa0533ed85d70015ad4ad39762d54",
+          "shared" : "b4d10e832714972f96bd3382e4d082a21a8333a16315b3ffb536061d2482360d",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic",
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 86,
+          "comment" : "non-canonical public key",
+          "public" : "f0ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "d83650ba7cec115881916255e3fa5fa0d6b8dcf968731bd2c9d2aec3f561f649",
+          "shared" : "515eac8f1ed0b00c70762322c3ef86716cd2c51fe77cec3d31b6388bc6eea336",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic",
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 87,
+          "comment" : "non-canonical public key",
+          "public" : "f1ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "88dd14e2711ebd0b0026c651264ca965e7e3da5082789fbab7e24425e7b4377e",
+          "shared" : "6919992d6a591e77b3f2bacbd74caf3aea4be4802b18b2bc07eb09ade3ad6662",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 88,
+          "comment" : "non-canonical public key",
+          "public" : "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "private" : "98c2b08cbac14e15953154e3b558d42bb1268a365b0ef2f22725129d8ac5cb7f",
+          "shared" : "9c034fcd8d3bf69964958c0105161fcb5d1ea5b8f8abb371491e42a7684c2322",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 89,
+          "comment" : "non-canonical public key",
+          "public" : "0200000000000000000000000000000000000000000000000000000000000080",
+          "private" : "c0697b6f05e0f3433b44ea352f20508eb0623098a7770853af5ca09727340c4e",
+          "shared" : "ed18b06da512cab63f22d2d51d77d99facd3c4502e4abf4e97b094c20a9ddf10",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic",
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 90,
+          "comment" : "non-canonical public key",
+          "public" : "0300000000000000000000000000000000000000000000000000000000000080",
+          "private" : "18422b58a18e0f4519b7a887b8cfb649e0bfe4b34d75963350a9944e5b7f5b7e",
+          "shared" : "448ce410fffc7e6149c5abec0ad5f3607dfde8a34e2ac3243c3009176168b432",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic",
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 91,
+          "comment" : "non-canonical public key",
+          "public" : "0400000000000000000000000000000000000000000000000000000000000080",
+          "private" : "20620d82487707bedf9ee3549e95cb9390d2618f50cf6acba47ffaa103224a6f",
+          "shared" : "03a633df01480d0d5048d92f51b20dc1d11f73e9515c699429b90a4f6903122a",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 92,
+          "comment" : "non-canonical public key",
+          "public" : "daffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+          "private" : "285a6a7ceeb7122f2c78d99c53b2a902b490892f7dff326f89d12673c3101b53",
+          "shared" : "9b01287717d72f4cfb583ec85f8f936849b17d978dbae7b837db56a62f100a68",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 93,
+          "comment" : "non-canonical public key",
+          "public" : "dbffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+          "private" : "c8e0330ae9dceeff887fba761225879a4bd2e0db08799244136e4721b2c88970",
+          "shared" : "dfe60831c9f4f96c816e51048804dbdc27795d760eced75ef575cbe3b464054b",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 94,
+          "comment" : "non-canonical public key",
+          "public" : "dcffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+          "private" : "10db6210fc1fb13382472fa1787b004b5d11868ab3a79510e0cee30f4a6df26b",
+          "shared" : "50bfa826ca77036dd2bbfd092c3f78e2e4a1f980d7c8e78f2f14dca3cce5cc3c",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic",
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 95,
+          "comment" : "non-canonical public key",
+          "public" : "eaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+          "private" : "9041c6e044a277df8466275ca8b5ee0da7bc028648054ade5c592add3057474e",
+          "shared" : "13da5695a4c206115409b5277a934782fe985fa050bc902cba5616f9156fe277",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 96,
+          "comment" : "non-canonical public key",
+          "public" : "ebffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+          "private" : "b8d499041a6713c0f6f876db7406587fdb44582f9542356ae89cfa958a34d266",
+          "shared" : "63483b5d69236c63cddbed33d8e22baecc2b0ccf886598e863c844d2bf256704",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 97,
+          "comment" : "non-canonical public key",
+          "public" : "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+          "private" : "c85f08e60c845f82099141a66dc4583d2b1040462c544d33d0453b20b1a6377e",
+          "shared" : "e9db74bc88d0d9bf046ddd13f943bccbe6dbb47d49323f8dfeedc4a694991a3c",
+          "result" : "acceptable",
+          "flags" : [
+            "NonCanonicalPublic"
+          ]
+        },
+        {
+          "tcId" : 98,
+          "comment" : "public key = 57896044618658097711785492504343953926634992332820282019728792003956564819968",
+          "public" : "0000000000000000000000000000000000000000000000000000000000000080",
+          "private" : "7887889bac4c629a101d3724f2ed8b98d936fde79e1a1f77d86779626bf8f263",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "NonCanonicalPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 99,
+          "comment" : "public key = 57896044618658097711785492504343953926634992332820282019728792003956564819969",
+          "public" : "0100000000000000000000000000000000000000000000000000000000000080",
+          "private" : "e07971ee820e48b0b266d8be3cdbbb5e900a43f59ee8535c6572418615de4962",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "NonCanonicalPublic",
+            "Twist",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 100,
+          "comment" : "RFC 7748",
+          "public" : "e6db6867583030db3594c1a424b15f7c726624ec26b3353b10a903a6d0ab1c4c",
+          "private" : "a046e36bf0527c9d3b16154b82465edd62144c0ac1fc5a18506a2244ba449a44",
+          "shared" : "c3da55379de9c6908e94ea4df28d084f32eccf03491c71f754b4075577a28552",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 101,
+          "comment" : "RFC 7748",
+          "public" : "e5210f12786811d3f4b7959d0538ae2c31dbe7106fc03c3efc4cd549c715a413",
+          "private" : "4866e9d4d1b4673c5ad22691957d6af5c11b6421e0ea01d42ca4169e7918ba4d",
+          "shared" : "95cbde9476e8907d7aade45cb4b873f88b595a68799fa152e6f8f7647aac7957",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 102,
+          "comment" : "RFC 8037, Section A.6",
+          "public" : "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f",
+          "private" : "77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a",
+          "shared" : "4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 103,
+          "comment" : "edge case for shared secret",
+          "public" : "b7b6d39c765cb60c0c8542f4f3952ffb51d3002d4aeb9f8ff988b192043e6d0a",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "0200000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 104,
+          "comment" : "edge case for shared secret",
+          "public" : "3b18df1e50b899ebd588c3161cbd3bf98ebcc2c1f7df53b811bd0e91b4d5153d",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "0900000000000000000000000000000000000000000000000000000000000000",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 105,
+          "comment" : "edge case for shared secret",
+          "public" : "cab6f9e7d8ce00dfcea9bbd8f069ef7fb2ac504abf83b87db601b5ae0a7f7615",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "1000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 106,
+          "comment" : "edge case for shared secret",
+          "public" : "4977d0d897e1ba566590f60f2eb0db6f7b24c13d436918ccfd32708dfad7e247",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "feffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff3f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 107,
+          "comment" : "edge case for shared secret",
+          "public" : "98730bc03e29e8b057fb1d20ef8c0bffc822485d3db7f45f4e3cc2c3c6d1d14c",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "fcffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff3f",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 108,
+          "comment" : "edge case for shared secret",
+          "public" : "97b4fff682df7f096cd1756569e252db482d45406a3198a1aff282a5da474c49",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "f9ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff3f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 109,
+          "comment" : "edge case for shared secret",
+          "public" : "317781b0163bae74accc06c0d44ef9a911a22b0d37faf7726621591f9343ea2f",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "f3ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff3f",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 110,
+          "comment" : "edge case for shared secret",
+          "public" : "7e26f8f24cb590027f9d1bc49b0e1a242c7d8f43624d3e8fab28ee08e02cb45e",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff03",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 111,
+          "comment" : "edge case for shared secret",
+          "public" : "e96d2780e5469a74620ab5aa2f62151d140c473320dbe1b028f1a48f8e76f95f",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "e5ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 112,
+          "comment" : "edge case for shared secret",
+          "public" : "8d612c5831aa64b057300e7e310f3aa332af34066fefcab2b089c9592878f832",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "e3ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 113,
+          "comment" : "edge case for shared secret",
+          "public" : "8d44108d05d940d3dfe5647ea7a87be24d0d036c9f0a95a2386b839e7b7bf145",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "ddffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 114,
+          "comment" : "edge case for shared secret",
+          "public" : "21a35d5db1b6237c739b56345a930aeee373cdcfb4701266782a8ac594913b29",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "dbffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 115,
+          "comment" : "edge case for shared secret",
+          "public" : "3e5efb63c352ce942762482bc9337a5d35ba55664743ac5e93d11f957336cb10",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000002",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 116,
+          "comment" : "edge case for shared secret",
+          "public" : "8e41f05ea3c76572be104ad8788e970863c6e2ca3daae64d1c2f46decfffa571",
+          "private" : "60a3a4f130b98a5be4b1cedb7cb85584a3520e142d474dc9ccb909a073a9767f",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000008000",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 117,
+          "comment" : "special case public key",
+          "public" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "private" : "c8d07c46bbfb827753b92c70e49583ce8bfa44641a7382258ea903d6a832c96b",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 118,
+          "comment" : "special case public key",
+          "public" : "0100000000000000000000000000000000000000000000000000000000000000",
+          "private" : "90b7ef237a055f348dcb4c4364a59d7d31edc7ab78f2ca254e2c810975c3f543",
+          "shared" : "0000000000000000000000000000000000000000000000000000000000000000",
+          "result" : "acceptable",
+          "flags" : [
+            "SmallPublicKey",
+            "LowOrderPublic",
+            "ZeroSharedSecret"
+          ]
+        },
+        {
+          "tcId" : 119,
+          "comment" : "special case public key",
+          "public" : "0200000000000000000000000000000000000000000000000000000000000000",
+          "private" : "e0a8be63315c4f0f0a3fee607f44d30a55be63f09561d9af93e0a1c9cf0ed751",
+          "shared" : "0c50ac2bfb6815b47d0734c5981379882a24a2de6166853c735329d978baee4d",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 120,
+          "comment" : "special case public key",
+          "public" : "1200000000000000000000000000000000000000000000000000000000000000",
+          "private" : "0840a8af5bc4c48da8850e973d7e14220f45c192cea4020d377eecd25c7c3643",
+          "shared" : "77557137a2a2a651c49627a9b239ac1f2bf78b8a3e72168ccecc10a51fc5ae66",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 121,
+          "comment" : "special case public key",
+          "public" : "1400000000000000000000000000000000000000000000000000000000000000",
+          "private" : "0092229c753a71284d0853909470ad847ab62f439ea51482fb41d30cc3b44743",
+          "shared" : "c88e719ae5c2248b5f90da346a92ae214f44a5d129fd4e9c26cf6a0da1efe077",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 122,
+          "comment" : "special case public key",
+          "public" : "0000000000000000000000000080000000000000000000000000000000000000",
+          "private" : "b8da2bd2d7cf25a3e54e5f87ee15911effb9ff86baec4076d56c8e953670bf5b",
+          "shared" : "4bf6789c7ea036f973cde0af02d6fdb9b64a0b957022111439570fad7d7a453f",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 123,
+          "comment" : "special case public key",
+          "public" : "ffffffffffffffffffffffffffff000000000000000000000000000000000000",
+          "private" : "684cd420af41abb3d10c61e773238cf729c2155f941ac27e15f4c37f49b29576",
+          "shared" : "bcac235ae15cc7148372e11f9315e3bc76ceb904b3d2a8246bd9d9be2082bb62",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 124,
+          "comment" : "special case public key",
+          "public" : "0100000000000000000000000000010000000000000000000000000000000000",
+          "private" : "38cfacaa4460796b4de434bdd6739f0d043671f97fa829517511e6b47aa93474",
+          "shared" : "5dd7d16fff25cc5fdf9e03c3157cb0a235cea17d618f36e6f13461567edeb943",
+          "result" : "acceptable",
+          "flags" : [
+            "Twist"
+          ]
+        },
+        {
+          "tcId" : 125,
+          "comment" : "special case public key",
+          "public" : "0000000000000000000000000000000000000000000000000000004000000000",
+          "private" : "30832e8cb627ac195f77b1105258e4bb18b99a5ed944404bfacb3a039fbdb14b",
+          "shared" : "2816fd031d51d6750f9225ede950625cca47441ca97e43092650396991afcb6d",
+          "result" : "valid",
+          "flags" : []
+        },
+        {
+          "tcId" : 126,
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+          "tcId" : 518,
+          "comment" : "special case private key",
+          "public" : "be3b3edeffaf83c54ae526379b23dd79f1cb41446e3687fef347eb9b5f0dc308",
+          "private" : "b8aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa6a",
+          "shared" : "e3c649beae7cc4a0698d519a0a61932ee5493cbb590dbe14db0274cc8611f914",
+          "result" : "valid",
+          "flags" : []
+        }
+      ]
+    }
+  ]
+}