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Diffstat (limited to 'src/encauth/gcm/gcm_reset.c')
| -rw-r--r-- | src/encauth/gcm/gcm_reset.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/encauth/gcm/gcm_reset.c b/src/encauth/gcm/gcm_reset.c new file mode 100644 index 0000000..b336a92 --- /dev/null +++ b/src/encauth/gcm/gcm_reset.c @@ -0,0 +1,44 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ + +/** + @file gcm_reset.c + GCM implementation, reset a used state so it can accept IV data, by Tom St Denis +*/ +#include "tomcrypt.h" + +#ifdef GCM_MODE + +/** + Reset a GCM state to as if you just called gcm_init(). This saves the initialization time. + @param gcm The GCM state to reset + @return CRYPT_OK on success +*/ +int gcm_reset(gcm_state *gcm) +{ + LTC_ARGCHK(gcm != NULL); + + zeromem(gcm->buf, sizeof(gcm->buf)); + zeromem(gcm->X, sizeof(gcm->X)); + gcm->mode = GCM_MODE_IV; + gcm->ivmode = 0; + gcm->buflen = 0; + gcm->totlen = 0; + gcm->pttotlen = 0; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_reset.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:58 $ */ |