64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wconversion"
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#pragma clang diagnostic ignored "-Wshorten-64-to-32"
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/**
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@file f9_init.c
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F9 Support, start an F9 state
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*/
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#ifdef LTC_F9_MODE
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/** Initialize F9-MAC state
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@param f9 [out] f9 state to initialize
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@param cipher Index of cipher to use
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@param key [in] Secret key
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@param keylen Length of secret key in octets
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Return CRYPT_OK on success
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*/
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int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen)
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{
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int x, err;
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LTC_ARGCHK(f9 != NULL);
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LTC_ARGCHK(key != NULL);
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/* schedule the key */
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if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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return err;
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}
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#ifdef LTC_FAST
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if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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return CRYPT_INVALID_ARG;
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}
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#endif
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if ((err = ecb_start(cipher, key, keylen, 0, &f9->key)) != CRYPT_OK) {
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goto done;
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}
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/* make the second key */
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for (x = 0; (unsigned)x < keylen; x++) {
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f9->akey[x] = key[x] ^ 0xAA;
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}
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/* setup struct */
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zeromem(f9->IV, cipher_descriptor[cipher].block_length);
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zeromem(f9->ACC, cipher_descriptor[cipher].block_length);
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f9->blocksize = cipher_descriptor[cipher].block_length;
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f9->cipher = cipher;
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f9->buflen = 0;
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f9->keylen = keylen;
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done:
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return err;
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}
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#endif
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#pragma clang diagnostic pop
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