Upload ttd_digital.py

ttd_digital.py

@@ -0,0 +1,43 @@
+import streamlit as st
+import hashlib
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.asymmetric import (
+   padding, rsa, utils
+)
+private_key = rsa.generate_private_key(
+    public_exponent=65537,
+    key_size=2048,
+)
+
+st.write("""
+## Tanda Tangan Digital RSA
+""") 
+input = st.text_input('Masukkan Teks', 'Niko Irsyad')
+
+prehashed_msg = hashlib.sha256(input.encode()).digest()
+signature = private_key.sign(
+    prehashed_msg,
+    padding.PSS(
+        mgf=padding.MGF1(hashes.SHA256()),
+        salt_length=padding.PSS.MAX_LENGTH
+    ),
+    utils.Prehashed(hashes.SHA256())
+)
+
+st.write("Tanda tangan digital :", signature)
+
+public_key = private_key.public_key()
+
+try :
+    public_key.verify(
+        signature,
+        prehashed_msg,
+        padding.PSS(
+            mgf=padding.MGF1(hashes.SHA256()),
+            salt_length=padding.PSS.MAX_LENGTH
+        ),
+        utils.Prehashed(hashes.SHA256())
+    )
+    st.write('Tanda tangan VALID')
+except InvalidSignature:
+    st.write('Tanda tangan INVALID')