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c9bcca21e4
--HG-- branch : libtomcrypt-orig extra : convert_revision : 1626dca9b669f35fc7b143ba5133a7ea90a191d3
47 lines
1.2 KiB
C
47 lines
1.2 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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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "mycrypt.h"
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#ifdef CFB
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int cfb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CFB *cfb)
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{
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int err;
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_ARGCHK(pt != NULL);
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_ARGCHK(ct != NULL);
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_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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cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key);
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cfb->padlen = 0;
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}
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cfb->pad[cfb->padlen] = (*ct = *pt ^ 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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