def Sign(self, msg):
"""
Return raw byte string of signature on the SHA-1 hash_id of the message.
@param msg: message to be signed
@type msg: string
@return: string representation of long int signature over message
@rtype: string
"""
emsa_encoded = util.MakeEmsaMessage(msg, self.size)
return util.BigIntToBytes(self.key.sign(emsa_encoded, None)[0])
def Verify(self, msg, sig):
"""
Return True if the signature corresponds to the message.
@param msg: message that has been signed
@type msg: string
@param sig: string representation of long int signature
@type sig: string
@return: True if signature is valid for the message hash. False otherwise.
@rtype: boolean
"""
try:
return self.key.verify(util.MakeEmsaMessage(msg, self.size), (util.BytesToLong(sig),))
except ValueError:
# if sig is not a long, it's invalid
return False