Python PyCrypto: Verify Signature Example.py

def verify_sign(public_key, signature, hashed_data):
    '''
        Verifies with a public key from whom the data came that it was indeed
        signed by their private key
        param: public_key
        param: signature String signature to be verified
        return: Boolean. True if the signature is valid; False otherwise.
    '''
    from Crypto.PublicKey import RSA
    from Crypto.Signature import PKCS1_v1_5
    from base64 import b64decode
    pub_key = public_key
    rsakey = RSA.importKey(pub_key)
    signer = PKCS1_v1_5.new(rsakey)
    if signer.verify(hashed_data, b64decode(signature)):
            return True
    return False