Update app_og.py

app_og.py

@@ -72,6 +72,11 @@ def sign(data,in2):
         "signature": signature
     }
     return data_json
+
+def validate_signature(public_key: bytes, signature: bytes, transaction_data: bytes):
+    public_key_object = RSA.import_key(public_key)
+    transaction_hash = SHA256.new(transaction_data)
+    pkcs1_15.new(public_key_object).verify(transaction_hash, signature)
     
 def encrypt_text(data,pub_im,priv_im,address):
     pub_key = stegan2.decode(pub_im)
@@ -151,6 +156,15 @@ def decrypt_text(im,in2):
     # Decrypt the data with the AES session key
     cipher_aes = AES.new(session_key, AES.MODE_EAX, nonce)
     data = cipher_aes.decrypt_and_verify(ciphertext, tag)
+    
+    public_key = private_key.publickey().export_key('PEM')
+    data_val = data[0]
+    signature = data[1]
+    transaction_hash = SHA256.new(data_val)
+
+    #transaction
+    
+    print (pkcs1_15.new(public_key).verify(transaction_hash, signature))
     return(data.decode("utf-8"))
 
 def test_fn(im1,im2):