[openssl-users] GCM cipher decryption

[Michel]

Hi,

Quick answer : as you probably noticed, IV, ciphertext and tag are expected
to be distinct buffers.
Consequently, ciphertext is just ciphertext (without IV or Tag).

Regards,

Michel.

-----Message d'origine-----
De : openssl-users [mailto:openssl-users-bounces at openssl.org] De la part de
c.holper at ades.at
Envoyé : mardi 12 juillet 2016 17:48
À : openssl-users at openssl.org
Objet : [openssl-users] GCM cipher decryption

Hi!

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

https://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decrypti
on#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
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