cipher: message authentication failed

Technical Discussion
1

I am using crypto/cipher to encrypt and decrypt password. Client encrypts the password and sends to remote server over the network. When the server receives the password, during decryption, error “cipher: message authentication failed” is seen. This issue is seen only when communication is over the network.

Issue is not seen when client and server are running on the same machine.

I am following standard implementation mentioned in https://golang.org/src/crypto/cipher/gcm.go

  • Nonce is of length 12 and new nonce is generated everytime using rand function

  • Encrypt implements " gcm.Seal(nonce, nonce, []byte(passwordStr), nil)"

  • Decrypt implements " gcm.Open(nil, nonce, encrypted, nil)". Error is encountered in this method.

Let me know if anyone else has faced same issue.

1 Like
2

How are you sending the data from the client to the server?

3

If you have the issue only when you send the encrypted string over the network perhaps you should care about encoding the data, eg:

4

I have faced the same issue. @nandinimurthy were you able to resolve? and what did you do?

5

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