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65 lines
1.6 KiB
65 lines
1.6 KiB
#define LTC_SOURCE
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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/**
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@file cfb_start.c
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CFB implementation, start chain, Tom St Denis
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*/
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#ifdef LTC_CFB_MODE
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/**
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Initialize a CFB context
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@param cipher The index of the cipher desired
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@param IV The initialization vector
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@param key The secret key
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@param keylen The length of the secret key (octets)
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@param num_rounds Number of rounds in the cipher desired (0 for default)
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@param cfb The CFB state to initialize
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@return CRYPT_OK if successful
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*/
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int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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int keylen, int num_rounds, symmetric_CFB *cfb)
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{
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int x, err;
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LTC_ARGCHK(IV != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(cfb != NULL);
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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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/* copy data */
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cfb->cipher = cipher;
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cfb->blocklen = cipher_descriptor[cipher].block_length;
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for (x = 0; x < cfb->blocklen; x++)
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cfb->IV[x] = IV[x];
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/* init the cipher */
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if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) {
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return err;
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}
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/* encrypt the IV */
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cfb->padlen = 0;
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return cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key);
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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