diff options
| author | David Goldwich <david.goldwich@gmail.com> | 2011-09-02 08:20:58 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2011-09-21 08:28:20 +0200 |
| commit | b3e144a7dfc6953df3b3e478eb8b8521ab5c6ecc (patch) | |
| tree | 7a560a4854c9316d3e7e64bdbc14cb30e8734716 /libavutil/des.h | |
| parent | 3ffe32eb96e2414bdd87b353953d77fb83eca8ae (diff) | |
des: add possibility to calculate DES-CBC-MAC with small buffer
This patch adds the possibility to calculate the DES-CBC-MAC of a
source buffer (i.e. the last block of the buffer encrypted in CBC
mode) without having to allocate a destination buffer that is as
long as the complete source buffer, but instead only 8 bytes
for the MAC.
Signed-off-by: David Goldwich <david.goldwich@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Diffstat (limited to 'libavutil/des.h')
| -rw-r--r-- | libavutil/des.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/libavutil/des.h b/libavutil/des.h index 935d7c5d71..cda98122d3 100644 --- a/libavutil/des.h +++ b/libavutil/des.h @@ -33,7 +33,7 @@ struct AVDES { * @brief Initializes an AVDES context. * * @param key_bits must be 64 or 192 - * @param decrypt 0 for encryption, 1 for decryption + * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption */ int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); @@ -49,4 +49,13 @@ int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); */ void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); +/** + * @brief Calculates CBC-MAC using the DES algorithm. + * + * @param count number of 8 byte blocks + * @param dst destination array, can be equal to src, must be 8-byte aligned + * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL + */ +void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); + #endif /* AVUTIL_DES_H */ |