?? xcbc_init.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@gmail.com, http://libtomcrypt.com */#include "tomcrypt.h"/** @file xcbc_init.c XCBC Support, start an XCBC state*/#ifdef LTC_XCBC/** Initialize XCBC-MAC state @param xcbc [out] XCBC 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 xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen){ int x, y, err; symmetric_key *skey; LTC_ARGCHK(xcbc != 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 /* schedule the user key */ skey = XCALLOC(1, sizeof(*skey)); if (skey == NULL) { return CRYPT_MEM; } if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) { goto done; } /* make the three keys */ for (y = 0; y < 3; y++) { for (x = 0; x < cipher_descriptor[cipher].block_length; x++) { xcbc->K[y][x] = y + 1; } cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey); } /* setup K1 */ err = cipher_descriptor[cipher].setup(xcbc->K[0], cipher_descriptor[cipher].block_length, 0, &xcbc->key); /* setup struct */ zeromem(xcbc->IV, cipher_descriptor[cipher].block_length); xcbc->blocksize = cipher_descriptor[cipher].block_length; xcbc->cipher = cipher; xcbc->buflen = 0;done: cipher_descriptor[cipher].done(skey);#ifdef LTC_CLEAN_STACK zeromem(skey, sizeof(*skey));#endif XFREE(skey); return err;}#endif/* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_init.c,v $ *//* $Revision: 1.4 $ *//* $Date: 2006/11/07 03:23:46 $ */
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