On 14 May 2013 14:44, yassine ahmed <[email protected]> wrote: > hi all, > please i don't know how calculate the icv (Integrity Check Value). used in > aes-gcm algorithm
The "Integrity Check Value" is known as the authentication tag. In order to retrieve the tag you must call EVP_CIPHER_CTX_ctrl with a "type" argument of EVP_CTRL_GCM_GET_TAG. A full example is available here: http://wiki.opensslfoundation.com/index.php/EVP_Authenticated_Encryption_and_Decryption Also see the openssl manual: http://wiki.opensslfoundation.com/index.php/Manual:EVP_EncryptInit%283%29#GCM_Mode Matt ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List [email protected] Automated List Manager [email protected]
