[openssl-users] GCM cipher decryption

[c.holper at ades.at]

Hi!

2 questions about GCM and the following OpenSSL-Sample please.

https://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption#Authenticated_Decryption_using_GCM_mode

and the function

int decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char 
*aad, int aad_len, unsigned char *tag, unsigned char *key, unsigned char 
*iv, unsigned char *plaintext)


* Is ciphertext the pure ciperhtext OR
is it with IV and TAG still in the string??

* If the 2nd: The IV is expected to be in front of the ciphertext and 
the TAG is expected to be past of the ciphertext - correct?
| IV | ciphertext | TAG |

thanks!
Christoph