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eax_decrypt.c
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eax_decrypt.c
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/* 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@iahu.ca, http://libtomcrypt.org
*/
/* EAX Implementation by Tom St Denis */
#include "mycrypt.h"
#ifdef EAX_MODE
int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt, unsigned long length)
{
int err;
_ARGCHK(eax != NULL);
_ARGCHK(pt != NULL);
_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