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66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/* 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_decrypt.c
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CFB implementation, decrypt data, Tom St Denis
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*/
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#ifdef LTC_CFB_MODE
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/**
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CFB decrypt
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@param ct Ciphertext
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@param pt [out] Plaintext
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@param len Length of ciphertext (octets)
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@param cfb CFB state
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@return CRYPT_OK if successful
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*/
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int cfb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CFB *cfb)
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{
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int err;
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(cfb != NULL);
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if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
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return err;
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}
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/* is blocklen/padlen valid? */
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if (cfb->blocklen < 0 || cfb->blocklen > (int)sizeof(cfb->IV) ||
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cfb->padlen < 0 || cfb->padlen > (int)sizeof(cfb->pad)) {
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return CRYPT_INVALID_ARG;
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}
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while (len-- > 0) {
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if (cfb->padlen == cfb->blocklen) {
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if ((err = cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key)) != CRYPT_OK) {
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return err;
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}
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cfb->padlen = 0;
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}
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cfb->pad[cfb->padlen] = *ct;
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*pt = *ct ^ cfb->IV[cfb->padlen];
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++pt;
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++ct;
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++(cfb->padlen);
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}
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return CRYPT_OK;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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