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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/gcrypt.texi | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/gcrypt.texi b/doc/gcrypt.texi index b608dba2..277717d2 100644 --- a/doc/gcrypt.texi +++ b/doc/gcrypt.texi @@ -2005,6 +2005,33 @@ truncated lengths (4, 8, 12, 13, 14, or 15). @end deftypefun +For encryption of AEAD cipher modes, it should be possible to generate +an initialization vector internally within libgcrypt implementation, +in coordinated way, instead of calling @code{gcry_cipher_setiv} with +arbitrary value, so that it can ensure the security properties of AEAD +block cipher. For this purpose, the following two functions are provided: + +@deftypefun {gcry_error_t} gcry_cipher_setup_geniv (gcry_cipher_hd_t @var{h}, @ + int @var{method}, const void *@var{fixed_iv}, size_t @var{fixed_ivlen}, @ + const void *@var{dyn_iv}, size_t @var{dyn_ivlen}) + +Set up an initialization vector generation for AEAD cipher modes. +Generation is specified by @var{method}, fixed part of initialization +vector by @var{fixed_iv} and @var{fixed_ivlen}, and dynamic part of +initialization vector by @var{dyn_iv} and @var{dyn_ivlen}. +For @var{method}, valid values are @code{GCRY_CIPHER_GENIV_METHOD_CONCAT} +and @code{GCRY_CIPHER_GENIV_METHOD_XOR}. +@end deftypefun + +@deftypefun {gcry_error_t} gcry_cipher_geniv (gcry_cipher_hd_t @var{h}, @ + void *@var{iv}, size_t @var{ivlen}) + +Generate the initialization vector into the output buffer @var{iv} +with length @var{ivlen}. The initialization vector will be used by +following @code{gcry_cipher_encrypt} call. +@end deftypefun + + The actual encryption and decryption is done by using one of the following functions. They may be used as often as required to process all the data. |