- Wire for mac decrypting messages full#
- Wire for mac decrypting messages password#
- Wire for mac decrypting messages mac#
The actual mode is determined by the segment size. The CFB mode is actually a set of similar modes.
Wire for mac decrypting messages mac#
Since you're using SHA-256 the MAC is 32 bytes long, so you do this hmac = enc
def verify_hmac(self, input_cipher, mac):Īnd later in decrypt(): verified_hmac = self.verify_hmac((iv+cipher_text), hmac)
Wire for mac decrypting messages full#
What you need to do is hash the IV+ciphertext and compare the result with the hash (called tag or HMAC-tag) that you slice off the full ciphertext. You hash the same data with the same key twice. You're not verifying anything in verify_hmac(). Var hmacKey = (masterKey.substr(length)) You better parse the strings into WordArrays yourself: var encryptionKey = (masterKey.substr(0, length)) As before, if the key is supplied as a string, a UTF-8 encoding is assumed which is not the case here. The () and CryptoJS.HmacSHA256() expect the key either as a WordArray object or as a string. You need to parse the data yourself into a WordArray: var hash = CryptoJS.HmacSHA256((concat), hmacKey) When you pass a string in, as you do, it will assume that the data is UTF-8 encoded and try to decode it as UTF-8. The HmacSHA256() function takes either a WordArray object or a string. If you want to convert the hex encoded registrationKey to base64 encoding, use: var basemessage = (registrationKey).toString(64) Ĭoncat is a hex-encoded string of the IV and ciphertext, because you forced the stringification by "adding" ( +) iv and encrypted. There is no need to encode it again with Base64 and bloat it even more: var basemessage = registrationKey You need to access the ciphertext property to get the encrypted WordArray: var concat = iv + encrypted.ciphertext Īnd var registrationKey = iv + encrypted.ciphertext + hash When you force them to be converted to strings by concatenating them ( +), iv and hash are Hex-encoded, but encrypted is formatted in an OpenSSL compatible format and Base64-encoded. The iv and hash variables are WordArray objects, but encrypted is not. Client (JavaScript):ĪES has a block size of 128 bit and CFB mode expects a full block for the IV. I was getting errors about input length of cipher text but when I switched to CFB mode that fixed it so I don't think it's a padding issue. I'm successful in re-calculating the HMAC but when I try and then decrypt the cipher I get something that seems encrypted with �'s in the result.
Wire for mac decrypting messages password#
Password = 'BJhtfRjKnTDTtPXUBnErKDxfkiMCOLyP'
Verified_hmac = self.verify_hmac((iv+cipher_text), self.hmac_key)Ĭipher = AES.new(self.key, AES.MODE_CFB, iv) # Verify HMAC using concatenation of iv + cipher like in js Return True if digest = local_digest else False Local_hash = HMAC.new(self.hmac_key, digestmod=SHA256) # Calculate hash using derived key from local password New_hash = HMAC.new(hmac_key, digestmod=SHA256) Self.hmac_key = key_hashĭef verify_hmac(self, input_cipher, hmac_key): Var registrationKey = iv + encrypted + hash Įncryption_key = key_hash Var hash = CryptoJS.HmacSHA256(concat, hmacKey) Calculate HMAC using iv and cipher text Var encryptionKey = masterKey.substr(0, length) Var length = masterKey.toString().length / 2 Var masterKey = CryptoJS.SHA256(password).toString() In this particular scenario, I am encrypting data on the client side with Crypto-JS and decrypting it back on a python server with P圜rypto.Įncrypt.js: var password = 'BJhtfRjKnTDTtPXUBnErKDxfkiMCOLyP'
Having a bit of trouble getting a AES cipher text to decrypt.
0 kommentar(er)
