diff options
Diffstat (limited to 'libtomcrypt/src/encauth/eax/eax_decrypt.c')
| -rw-r--r-- | libtomcrypt/src/encauth/eax/eax_decrypt.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/libtomcrypt/src/encauth/eax/eax_decrypt.c b/libtomcrypt/src/encauth/eax/eax_decrypt.c new file mode 100644 index 0000000..22a66ab --- /dev/null +++ b/libtomcrypt/src/encauth/eax/eax_decrypt.c @@ -0,0 +1,50 @@ +/* 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.com + */ + +/** + @file eax_decrypt.c + EAX implementation, decrypt block, by Tom St Denis +*/ +#include "tomcrypt.h" + +#ifdef EAX_MODE + +/** + Decrypt data with the EAX protocol + @param eax The EAX state + @param ct The ciphertext + @param pt [out] The plaintext + @param length The length (octets) of the ciphertext + @return CRYPT_OK if successful +*/ +int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt, + unsigned long length) +{ + int err; + + LTC_ARGCHK(eax != NULL); + LTC_ARGCHK(pt != NULL); + LTC_ARGCHK(ct != NULL); + + /* omac ciphertext */ + if ((err = omac_process(&eax->ctomac, ct, length)) != CRYPT_OK) { + return err; + } + + /* decrypt */ + return ctr_decrypt(ct, pt, length, &eax->ctr); +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/encauth/eax/eax_decrypt.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2006/03/31 14:15:35 $ */ |