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       gnutls_aead_cipher_decrypt - API function


       #include <gnutls/crypto.h>

       int  gnutls_aead_cipher_decrypt(gnutls_aead_cipher_hd_t handle, const void * nonce, size_t
       nonce_len, const void * auth, size_t auth_len, size_t tag_size, const void * ctext, size_t
       ctext_len, void * ptext, size_t * ptext_len);


       gnutls_aead_cipher_hd_t handle
                   is a gnutls_aead_cipher_hd_t type.

       const void * nonce
                   the nonce to set

       size_t nonce_len
                   The length of the nonce

       const void * auth
                   additional data to be authenticated

       size_t auth_len
                   The length of the data

       size_t tag_size
                   The size of the tag to use (use zero for the default)

       const void * ctext
                   the data to decrypt (including the authentication tag)

       size_t ctext_len
                   the length of data to decrypt (includes tag size)

       void * ptext
                   the decrypted data

       size_t * ptext_len
                   the length of decrypted data (initially must hold the maximum available size)


       This  function  will  decrypt the given data using the algorithm specified by the context.
       This function  must  be  provided  the  complete  data  to  be  decrypted,  including  the
       authentication  tag.  On  several  AEAD ciphers, the authentication tag is appended to the
       ciphertext, though this is not a  general  rule.  This  function  will  fail  if  the  tag
       verification fails.


       Zero or a negative error code on verification failure or other error.




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