Repository: wultra/powerauth-crypto (java)

Issue:
Update token digest calculation
### Description

Use `KMAC-256` instead of `HmacSha256`.

### Acceptance criteria

_No response_

### Technical specification

_No response_

### QA specification

_No response_

Pull request description:
Fix #703: Update token digest calculation

Patch:
diff --git a/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/lib/util/TokenUtils.java b/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/lib/util/TokenUtils.java
index c634a5e6..b8ce45b4 100644
--- a/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/lib/util/TokenUtils.java
+++ b/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/lib/util/TokenUtils.java
@@ -19,7 +19,9 @@ package com.wultra.security.powerauth.crypto.lib.util;
 import com.wultra.security.powerauth.crypto.lib.generator.KeyGenerator;
 import com.wultra.security.powerauth.crypto.lib.model.exception.CryptoProviderException;
 import com.wultra.security.powerauth.crypto.lib.model.exception.GenericCryptoException;
+import com.wultra.security.powerauth.crypto.lib.v4.kdf.Kmac;
 
+import javax.crypto.SecretKey;
 import java.nio.charset.StandardCharsets;
 import java.util.UUID;
 
@@ -27,11 +29,15 @@ import java.util.UUID;
  * Class used for computing PowerAuth Token digests.
  *
  * @author Petr Dvorak, petr@wultra.com
+ * @author Roman Strobl, roman.strobl@wultra.com
  */
 public class TokenUtils {
 
-    private final KeyGenerator keyGenerator = new KeyGenerator();
-    private final HMACHashUtilities hmac = new HMACHashUtilities();
+    private static final byte[] DIGEST_KMAC_CUSTOM_BYTES = "PA4DIGEST".getBytes(StandardCharsets.UTF_8);
+
+    private static final KeyGenerator KEY_GENERATOR = new KeyGenerator();
+    private static final KeyConvertor KEY_CONVERTOR = new KeyConvertor();
+    private static final HMACHashUtilities HMAC = new HMACHashUtilities();
 
     /**
      * Generate random token ID. Use UUID format.
@@ -45,11 +51,12 @@ public class TokenUtils {
     /**
      * Generate random token secret, 16 random bytes.
      *
+     * @param length Number of random bytes.
      * @return Random token secret.
      * @throws CryptoProviderException In case key cryptography provider is incorrectly initialized.
      */
-    public byte[] generateTokenSecret() throws CryptoProviderException {
-        return keyGenerator.generateRandomBytes(16);
+    public byte[] generateTokenSecret(int length) throws CryptoProviderException {
+        return KEY_GENERATOR.generateRandomBytes(length);
     }
 
     /**
@@ -59,7 +66,7 @@ public class TokenUtils {
      * @throws CryptoProviderException In case key cryptography provider is incorrectly initialized.
      */
     public byte[] generateTokenNonce() throws CryptoProviderException {
-        return keyGenerator.generateRandomBytes(16);
+        return KEY_GENERATOR.generateRandomBytes(16);
     }
 
     /**
@@ -67,7 +74,7 @@ public class TokenUtils {
      * String representation of timestamp.<br>
      * <br>
      * The timestamp conversion works like this: Long timestamp is converted to String and then, bytes of the
-     * String are extracted usign the UTF-8 encoding.<br>
+     * String are extracted using the UTF-8 encoding.<br>
      * <br>
      * Code: <code>String.valueOf(System.currentTimeMillis()).getBytes(StandardCharsets.UTF_8);</code>
      *
@@ -101,12 +108,24 @@ public class TokenUtils {
     public byte[] computeTokenDigest(byte[] nonce, byte[] timestamp, String version, byte[] tokenSecret) throws GenericCryptoException, CryptoProviderException {
         final byte[] amp = "&".getBytes(StandardCharsets.UTF_8);
         final byte[] data;
+        final byte[] digest;
         switch (version) {
-            case "3.3", "3.2" -> data = ByteUtils.concat(nonce, amp, timestamp, amp, version.getBytes(StandardCharsets.UTF_8));
-            case "3.0", "3.1" -> data = ByteUtils.concat(nonce, amp, timestamp);
+            case "3.3", "3.2" -> {
+                data = ByteUtils.concat(nonce, amp, timestamp, amp, version.getBytes(StandardCharsets.UTF_8));
+                digest = HMAC.hash(tokenSecret, data);
+            }
+            case "3.0", "3.1" -> {
+                data = ByteUtils.concat(nonce, amp, timestamp);
+                digest = HMAC.hash(tokenSecret, data);
+            }
+            case "4.0" -> {
+                data = ByteUtils.concat(nonce, amp, timestamp, amp, version.getBytes(StandardCharsets.UTF_8));
+                final SecretKey secretKey = KEY_CONVERTOR.convertBytesToSharedSecretKey(tokenSecret);
+                digest = Kmac.kmac256(secretKey, data, 32, DIGEST_KMAC_CUSTOM_BYTES);
+            }
             default -> throw new GenericCryptoException("Unsupported version value was specified: " + version);
         }
-        return hmac.hash(tokenSecret, data);
+        return digest;
     }
 
     /**
diff --git a/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/server/token/ServerTokenGenerator.java b/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/server/token/ServerTokenGenerator.java
index 9c6c349d..6b149960 100644
--- a/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/server/token/ServerTokenGenerator.java
+++ b/powerauth-java-crypto/src/main/java/com/wultra/security/powerauth/crypto/server/token/ServerTokenGenerator.java
@@ -17,12 +17,14 @@
 package com.wultra.security.powerauth.crypto.server.token;
 
 import com.wultra.security.powerauth.crypto.lib.model.exception.CryptoProviderException;
+import com.wultra.security.powerauth.crypto.lib.model.exception.GenericCryptoException;
 import com.wultra.security.powerauth.crypto.lib.util.TokenUtils;
 
 /**
  * Server side class used for generating new tokens.
  *
  * @author Petr Dvorak, petr@wultra.com
+ * @author Roman Strobl, roman.strobl@wultra.com
  */
 public class ServerTokenGenerator {
 
@@ -37,12 +39,20 @@ public class ServerTokenGenerator {
     }
 
     /**
-     * Generate random token secret, 16 random bytes.
+     * Generate random token secret, 16 or 32 random bytes depending on the version.
+     * @param version Protocol version.
      * @return Random token secret.
      * @throws CryptoProviderException In case key cryptography provider is incorrectly initialized.
+     * @throws GenericCryptoException In case the protocol version is not supported.
      */
-    public byte[] generateTokenSecret() throws CryptoProviderException {
-        return tokenUtils.generateTokenSecret();
+    public byte[] generateTokenSecret(String version) throws CryptoProviderException, GenericCryptoException {
+        final byte[] tokenSecret;
+        switch (version) {
+            case "3.0", "3.1", "3.2", "3.3" -> tokenSecret = tokenUtils.generateTokenSecret(16);
+            case "4.0" -> tokenSecret = tokenUtils.generateTokenSecret(32);
+            default -> throw new GenericCryptoException("Unsupported protocol version: " + version);
+        }
+        return tokenSecret;
     }
 
 }


Test patch:
diff --git a/powerauth-java-crypto/src/test/java/com/wultra/security/powerauth/crypto/lib/util/TokenUtilsTest.java b/powerauth-java-crypto/src/test/java/com/wultra/security/powerauth/crypto/lib/util/TokenUtilsTest.java
new file mode 100644
index 00000000..2eccacf1
--- /dev/null
+++ b/powerauth-java-crypto/src/test/java/com/wultra/security/powerauth/crypto/lib/util/TokenUtilsTest.java
@@ -0,0 +1,114 @@
+/*
+ * PowerAuth Crypto Library
+ * Copyright 2025 Wultra s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.wultra.security.powerauth.crypto.lib.util;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.wultra.security.powerauth.crypto.lib.model.exception.CryptoProviderException;
+import com.wultra.security.powerauth.crypto.lib.model.exception.GenericCryptoException;
+import com.wultra.security.powerauth.crypto.lib.v4.sharedsecret.SharedSecretEcdheTest;
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.Security;
+import java.util.Base64;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Test of token utility methods.
+ *
+ * @author Roman Strobl, roman.strobl@wultra.com
+ */
+public class TokenUtilsTest {
+
+    private static final TokenUtils TOKEN_UTILS = new TokenUtils();
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    static {
+        Security.addProvider(new BouncyCastleProvider());
+    }
+
+    @Test
+    public void testTokenDigestV30() throws CryptoProviderException, GenericCryptoException {
+        final byte[] tokenSecret = TOKEN_UTILS.generateTokenSecret(16);
+        final byte[] timestamp = TOKEN_UTILS.generateTokenTimestamp();
+        final byte[] nonce = TOKEN_UTILS.generateTokenNonce();
+        final byte[] tokenDigest = TOKEN_UTILS.computeTokenDigest(nonce, timestamp, "3.0", tokenSecret);
+        assertTrue(TOKEN_UTILS.validateTokenDigest(nonce, timestamp, "3.0", tokenSecret, tokenDigest));
+    }
+
+    @Test
+    public void testTokenDigestV31() throws CryptoProviderException, GenericCryptoException {
+        final byte[] tokenSecret = TOKEN_UTILS.generateTokenSecret(16);
+        final byte[] timestamp = TOKEN_UTILS.generateTokenTimestamp();
+        final byte[] nonce = TOKEN_UTILS.generateTokenNonce();
+        final byte[] tokenDigest = TOKEN_UTILS.computeTokenDigest(nonce, timestamp, "3.1", tokenSecret);
+        assertTrue(TOKEN_UTILS.validateTokenDigest(nonce, timestamp, "3.1", tokenSecret, tokenDigest));
+    }
+
+    @Test
+    public void testTokenDigestV32() throws CryptoProviderException, GenericCryptoException {
+        final byte[] tokenSecret = TOKEN_UTILS.generateTokenSecret(16);
+        final byte[] timestamp = TOKEN_UTILS.generateTokenTimestamp();
+        final byte[] nonce = TOKEN_UTILS.generateTokenNonce();
+        final byte[] tokenDigest = TOKEN_UTILS.computeTokenDigest(nonce, timestamp, "3.2", tokenSecret);
+        assertTrue(TOKEN_UTILS.validateTokenDigest(nonce, timestamp, "3.2", tokenSecret, tokenDigest));
+    }
+
+    @Test
+    public void testTokenDigestV33() throws CryptoProviderException, GenericCryptoException {
+        final byte[] tokenSecret = TOKEN_UTILS.generateTokenSecret(16);
+        final byte[] timestamp = TOKEN_UTILS.generateTokenTimestamp();
+        final byte[] nonce = TOKEN_UTILS.generateTokenNonce();
+        final byte[] tokenDigest = TOKEN_UTILS.computeTokenDigest(nonce, timestamp, "3.3", tokenSecret);
+        assertTrue(TOKEN_UTILS.validateTokenDigest(nonce, timestamp, "3.3", tokenSecret, tokenDigest));
+    }
+
+    @Test
+    public void testTokenDigestV40() throws CryptoProviderException, GenericCryptoException {
+        final byte[] tokenSecret = TOKEN_UTILS.generateTokenSecret(32);
+        final byte[] timestamp = TOKEN_UTILS.generateTokenTimestamp();
+        final byte[] nonce = TOKEN_UTILS.generateTokenNonce();
+        final byte[] tokenDigest = TOKEN_UTILS.computeTokenDigest(nonce, timestamp, "4.0", tokenSecret);
+        assertTrue(TOKEN_UTILS.validateTokenDigest(nonce, timestamp, "4.0", tokenSecret, tokenDigest));
+    }
+
+    private static Stream<Map<String, String>> jsonDataTokenDigestV40_Provider() throws IOException {
+        final InputStream stream = SharedSecretEcdheTest.class.getResourceAsStream("/com/wultra/security/powerauth/crypto/lib/v4/token/Token_Digest_Test_Vectors.json");
+        final Map<String, List<Map<String, String>>> testData = MAPPER.readValue(stream, new TypeReference<>() {});
+        return testData.get("token_digest_test_vectors").stream();
+    }
+
+    @ParameterizedTest
+    @MethodSource("jsonDataTokenDigestV40_Provider")
+    public void testVectorsTokenDigestV40(Map<String, String> vector) throws Exception {
+        final byte[] tokenSecret = Base64.getDecoder().decode(vector.get("tokenSecret"));
+        final byte[] nonce = Base64.getDecoder().decode(vector.get("nonce"));
+        final byte[] timestamp = Base64.getDecoder().decode(vector.get("timestamp"));
+        final byte[] tokenDigest = Base64.getDecoder().decode(vector.get("tokenDigest"));
+        assertTrue(TOKEN_UTILS.validateTokenDigest(nonce, timestamp, "4.0", tokenSecret, tokenDigest));
+    }
+
+}
diff --git a/powerauth-java-crypto/src/test/resources/com/wultra/security/powerauth/crypto/lib/v4/token/Token_Digest_Test_Vectors.json b/powerauth-java-crypto/src/test/resources/com/wultra/security/powerauth/crypto/lib/v4/token/Token_Digest_Test_Vectors.json
new file mode 100644
index 00000000..ac9c2bda
--- /dev/null
+++ b/powerauth-java-crypto/src/test/resources/com/wultra/security/powerauth/crypto/lib/v4/token/Token_Digest_Test_Vectors.json
@@ -0,0 +1,604 @@
+{
+  "token_digest_test_vectors": [
+    {
+      "tokenSecret": "GTminer6ABUm2t1OAY/3rI7V7YGH99zsjTWIgbvTzyo=",
+      "timestamp": "MTczODkyNzQ4NjUwNA==",
+      "nonce": "LzjsEkjde5gg3O/7xX+Vkg==",
+      "tokenDigest": "BvQusfbGcMMbMc2xyP+zMlgFZNmEgjS7hwRwghJyRyA="
+    },
+    {
+      "tokenSecret": "4EndlGXlxTQfO6dAb67tUmF1oYtJptg4hsZIp44s5Xc=",
+      "timestamp": "MTczODkyNzQ4NjUxOQ==",
+      "nonce": "NkZqsMlyg9xJPcjI0HcMag==",
+      "tokenDigest": "+9RRrjZcDy4PvHDnugvgomBzMavjhPE6C4KyJhCBdEM="
+    },
+    {
+      "tokenSecret": "Ej3dUNmnBuP9/wxKG7/H9gY6qgLdlJDxpIsrH52nO+0=",
+      "timestamp": "MTczODkyNzQ4NjUyNA==",
+      "nonce": "pEn5NasM3nC9OscIRuKhzw==",
+      "tokenDigest": "GbK2O3ovVcUeI3149AxxhtWgzkd3qilSBDWzrQ1fP5I="
+    },
+    {
+      "tokenSecret": "gCqIzHtFuipkxLASAbEKx2FAh2oKksRerYjpfCjecz0=",
+      "timestamp": "MTczODkyNzQ4NjUyOA==",
+      "nonce": "KJHkmF5dvdmXuIHqE0ELKw==",
+      "tokenDigest": "BUuqHTbuFYvJuF8wz9hMtHjy0RBMaejD2NhlfVJWPeQ="
+    },
+    {
+      "tokenSecret": "2K/s4kXdRR9FfeSJ37z93oXGhSR4XM1zGEnEVTfDzj8=",
+      "timestamp": "MTczODkyNzQ4NjUzMg==",
+      "nonce": "/ln7O02za49rCu1XpLMiZA==",
+      "tokenDigest": "tcaOMi9BDdZq9dwV3Z80qFX2NHckVOShjPikL7Qjzgs="
+    },
+    {
+      "tokenSecret": "VI0xZDEijCm9F9sfzp9eudNpMoZ8+V4VQ4mhJnOOzqE=",
+      "timestamp": "MTczODkyNzQ4NjUzNQ==",
+      "nonce": "2kKL2eVf7sgTXNmdKDzBcg==",
+      "tokenDigest": "uXwLvJDnA2632x583Wy3enYX219P+DvfCbyRKtmAQRo="
+    },
+    {
+      "tokenSecret": "xnkOExX7Si0tWO/freSTc5r+nZHdnQfwIEGncSm/UGE=",
+      "timestamp": "MTczODkyNzQ4NjUzOA==",
+      "nonce": "r6xyXcTjmHu+KfNxHypngQ==",
+      "tokenDigest": "0EyEIvENL2lTWIPLyr9kWLpQpFKD7lwZpOFTxZfQ0Sk="
+    },
+    {
+      "tokenSecret": "SRdusB9VZgpM+p1QH3ZGc+QnZ7H9JzX1VsOdC0C1DHk=",
+      "timestamp": "MTczODkyNzQ4NjU0MA==",
+      "nonce": "wvOy2GsebIoy1qQ8chSYHQ==",
+      "tokenDigest": "/1BUK45rN8/Yugo2nDB7QNY2LhSvHb3Rucgdj7K72kE="
+    },
+    {
+      "tokenSecret": "v/LlRmQXeoqlXstMe41+cINq+kHAfIoc3Crs5PTLmKQ=",
+      "timestamp": "MTczODkyNzQ4NjU0Mw==",
+      "nonce": "Wej0Tmtd5te7hOZB5CQ57A==",
+      "tokenDigest": "o4m5Y4WJ0p965GfI/KoFO1wpzVwlqHkNc5g1uP9D4rY="
+    },
+    {
+      "tokenSecret": "bKr9lt72jOHW9HJAOQnBJaQ9G+na4H9JvQEGJ+UcnTE=",
+      "timestamp": "MTczODkyNzQ4NjU0Ng==",
+      "nonce": "d8EQD5f8BEZAC1uz5E/8ZQ==",
+      "tokenDigest": "MDy6USqfyG2n0hZQ1lz3PMNqts8slST5pWoOwD6gnf8="
+    },
+    {
+      "tokenSecret": "pUbk5my50xoI8YP8fzMIxw48pDXS7t2FWhpx+p/qpLY=",
+      "timestamp": "MTczODkyNzQ4NjU0OA==",
+      "nonce": "hys0mn85g+hjgE0Dek/Vjg==",
+      "tokenDigest": "Aa4eMokv2QAqEKGHF9NNuwaLbEbM9MnBCsgLsgQncaE="
+    },
+    {
+      "tokenSecret": "3LZwFCpmCQVnZFDKM5YfxkMde3ExHmTB4MDX14cyXpw=",
+      "timestamp": "MTczODkyNzQ4NjU1MQ==",
+      "nonce": "Yc8BghNiQsWSaZXa2dSicQ==",
+      "tokenDigest": "8u6G3C6KR/yUy52rKR5Ca2Ir+lKtwmE0B2kl2r09/lI="
+    },
+    {
+      "tokenSecret": "7jmDpBbl5vTU+7VsBxi6aU4C59tPdONcoYPcOeLv9xM=",
+      "timestamp": "MTczODkyNzQ4NjU1Mw==",
+      "nonce": "tj+OQoHzdFYOnCVfr3OV4Q==",
+      "tokenDigest": "IJxrDHfmbitNpv+J83SGg83yj30iQD7uqwy/cpqbdnY="
+    },
+    {
+      "tokenSecret": "s767wHI59xRPJ4+EcABjPW5vlhYw09495gmbg45BV4Y=",
+      "timestamp": "MTczODkyNzQ4NjU1Ng==",
+      "nonce": "U1AKO/p9BGNCOhPv6Mz6sw==",
+      "tokenDigest": "QygLAUw68DLHmlhcCc7N1PSJwoVddQj5amTPWXpm91o="
+    },
+    {
+      "tokenSecret": "HX3QNotJb3yE3bD/TMpoRIOWzeY5lHMv74kyP6mCh8I=",
+      "timestamp": "MTczODkyNzQ4NjU1OA==",
+      "nonce": "zndJa29SMoTjKv1A+QTVYA==",
+      "tokenDigest": "sH/tks5urctNpg5QQdT0ut091tVifrF6sfrQV65iFMA="
+    },
+    {
+      "tokenSecret": "TfaJ5sshcrOocuK/i5ZwQ5iFQM8wXxKs7IwgPeWM73E=",
+      "timestamp": "MTczODkyNzQ4NjU2MQ==",
+      "nonce": "yun3bGbcaAthhIJvjtgMKQ==",
+      "tokenDigest": "IbE+661DDCjWn4Zwa0pXT9YFufVEf4Qs+SXefHIFpgg="
+    },
+    {
+      "tokenSecret": "vFQ+zGi8ATB9QIts39VNIif/hDacGUl87jgmFlzJdMs=",
+      "timestamp": "MTczODkyNzQ4NjU2NA==",
+      "nonce": "HwFWeC5XPO+Ak3dnHVqhKA==",
+      "tokenDigest": "W2chz9alW2ojaVtsUxs5306jFQy/BjOALL02JzRwhI0="
+    },
+    {
+      "tokenSecret": "wEc79n2zb9iCWjWVCPCk435IUpEy/800rEin0jQgsJ8=",
+      "timestamp": "MTczODkyNzQ4NjU2Nw==",
+      "nonce": "pR8Ipfc3WTY6mss/EAumpA==",
+      "tokenDigest": "IEX511iyt/CgwR+EcWwbTovMqEs2XdIYNfc7yJiB5vI="
+    },
+    {
+      "tokenSecret": "0R15BT40w+s2Fy8GCc/+eL3jAs75VoJa+WmhpkS6A5M=",
+      "timestamp": "MTczODkyNzQ4NjU2OQ==",
+      "nonce": "oQPRIBqNQyLRrhgG1hljKw==",
+      "tokenDigest": "cD/DbC1fYrzQ+8GtDy5AJX1hfV8crM6ETzmqR+iV5ok="
+    },
+    {
+      "tokenSecret": "U1uj9nUsdw0KVQg8zCeddZY3IRdQ6sLTEO4hmnaOfrk=",
+      "timestamp": "MTczODkyNzQ4NjU3MQ==",
+      "nonce": "kpFYv3xVklyG0qXNHoHWkA==",
+      "tokenDigest": "ccEPyDGmqLDG6x8nXDJgfY8qIETieBpcM8dRM6Qouqg="
+    },
+    {
+      "tokenSecret": "zhv7ra1xC52N9AS6CkbdK3KFPYuDFqlzZmW+HGdwMyQ=",
+      "timestamp": "MTczODkyNzQ4NjU3Mw==",
+      "nonce": "d9+qByd7l/fK+hCU94m5/w==",
+      "tokenDigest": "UN0p9L9yxoq0o2FteUGpDujAhddAu3cAorN83lfk+gA="
+    },
+    {
+      "tokenSecret": "Ybo7gWVxfCAsgv724GLoFrGPPNEsQ+loH8gl24hHM08=",
+      "timestamp": "MTczODkyNzQ4NjU3Ng==",
+      "nonce": "i6XNxtYik2djGSjIYPTedA==",
+      "tokenDigest": "jzU3Ax3GLdDUMXwGak0+9ZpRKZzgmhpTPxf5IyTLY2w="
+    },
+    {
+      "tokenSecret": "rnPZiAdfvMEhcySRmsHGAgS5p5dE+ZRBeROrnvlaEkw=",
+      "timestamp": "MTczODkyNzQ4NjU3OA==",
+      "nonce": "S4XfyYC8Lt1pgbVPqpiEgw==",
+      "tokenDigest": "JNJk35RFUKOUL8jsy6KugObr8WcXx0F2OuQIH8gamiM="
+    },
+    {
+      "tokenSecret": "ZYam2mcVoA9wLNiG6SVLI5fiP7IOw2EiMdjaTB8F8kc=",
+      "timestamp": "MTczODkyNzQ4NjU4MA==",
+      "nonce": "VcOlUY7JOe2Fk0jMZ0uafQ==",
+      "tokenDigest": "kEt2Ya6AIJyQg2s5TVMEbpiLb1IvBp4ABLYj1vS+C0o="
+    },
+    {
+      "tokenSecret": "oTm2Il5X3PcPltQB/AepEt87VAQ4E25I2zPxb2JGwvg=",
+      "timestamp": "MTczODkyNzQ4NjU4Mg==",
+      "nonce": "szs6QA9jqPw36KtMKq1xbw==",
+      "tokenDigest": "R7CYTO5thg5zDmvfw3gcbTC4HyLEADEmT6fQ/DYZvq8="
+    },
+    {
+      "tokenSecret": "CCcN9zfiiaB2778qzSW8kb8zCGHGrCbQ10Zhpzc1/ks=",
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+}
\ No newline at end of file