759 def MAC(flags, handle, signingKey, seqNum, message):  argument
766 …cksum'] = struct.unpack('<q',handle(hmac_md5(signingKey, struct.pack('<i',seqNum)+message)[:8]))[0]
767            messageSignature['SeqNum'] = seqNum
768            seqNum += 1
771 …ure['Checksum'] = struct.unpack('<q',hmac_md5(signingKey, struct.pack('<i',seqNum)+message)[:8])[0]
772            messageSignature['SeqNum'] = seqNum
773            seqNum += 1
781        messageSignature['SeqNum'] = struct.unpack('<i',messageSignature['SeqNum'])[0] ^ seqNum
786 def SEAL(flags, signingKey, sealingKey, messageToSign, messageToEncrypt, seqNum, handle):  argument
788    signature = MAC(flags, handle, signingKey, seqNum, messageToSign)
791 def SIGN(flags, signingKey, message, seqNum, handle):  argument
792    return MAC(flags, handle, signingKey, seqNum, message)