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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@gmail.com, http://libtomcrypt.com
*/
#include "tomcrypt.h"
/**
@file f9_init.c
F9 Support, start an F9 state
*/
#ifdef LTC_F9_MODE
/** Initialize F9-MAC state
@param f9 [out] f9 state to initialize
@param cipher Index of cipher to use
@param key [in] Secret key
@param keylen Length of secret key in octets
Return CRYPT_OK on success
*/
int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen)
{
int x, err;
LTC_ARGCHK(f9 != NULL);
LTC_ARGCHK(key != NULL);
/* schedule the key */
if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
return err;
}
#ifdef LTC_FAST
if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
return CRYPT_INVALID_ARG;
}
#endif
if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) {
goto done;
}
/* make the second key */
for (x = 0; (unsigned)x < keylen; x++) {
f9->akey[x] = key[x] ^ 0xAA;
}
/* setup struct */
zeromem(f9->IV, cipher_descriptor[cipher].block_length);
zeromem(f9->ACC, cipher_descriptor[cipher].block_length);
f9->blocksize = cipher_descriptor[cipher].block_length;
f9->cipher = cipher;
f9->buflen = 0;
f9->keylen = keylen;
done:
return err;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_init.c,v $ */
/* $Revision: 1.4 $ */
/* $Date: 2006/11/08 22:54:18 $ */
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