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@radupotop
Created June 5, 2023 16:12
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from Crypto.PublicKey import RSA
from Crypto.Signature.pkcs1_15 import PKCS115_SigScheme
from Crypto.Hash import SHA256
import binascii
# Generate 1024-bit RSA key pair (private + public key)
keyPair = RSA.generate(bits=1024)
pubKey = keyPair.publickey()
# Sign the message using the PKCS#1 v1.5 signature scheme (RSASP1)
msg = b'Message for RSA signing'
hash = SHA256.new(msg)
signer = PKCS115_SigScheme(keyPair)
signature = signer.sign(hash)
print("Signature:", binascii.hexlify(signature))
# Verify valid PKCS#1 v1.5 signature (RSAVP1)
msg = b'Message for RSA signing'
hash = SHA256.new(msg)
verifier = PKCS115_SigScheme(pubKey)
try:
verifier.verify(hash, signature)
print("Signature is valid.")
except:
print("Signature is invalid.")
# Verify invalid PKCS#1 v1.5 signature (RSAVP1)
msg = b'A tampered message'
hash = SHA256.new(msg)
verifier = PKCS115_SigScheme(pubKey)
try:
verifier.verify(hash, signature)
print("Signature is valid.")
except:
print("Signature is invalid.")
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