65 lines
1.5 KiB
C
65 lines
1.5 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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/* OCB Implementation by Tom St Denis */
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#include "mycrypt.h"
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#ifdef OCB_MODE
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int ocb_encrypt_authenticate_memory(int cipher,
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const unsigned char *key, unsigned long keylen,
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const unsigned char *nonce,
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const unsigned char *pt, unsigned long ptlen,
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unsigned char *ct,
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unsigned char *tag, unsigned long *taglen)
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{
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int err;
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ocb_state *ocb;
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_ARGCHK(key != NULL);
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_ARGCHK(nonce != NULL);
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_ARGCHK(pt != NULL);
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_ARGCHK(ct != NULL);
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_ARGCHK(tag != NULL);
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_ARGCHK(taglen != NULL);
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/* allocate ram */
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ocb = XMALLOC(sizeof(ocb_state));
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if (ocb == NULL) {
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return CRYPT_MEM;
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}
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if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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goto __ERR;
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}
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while (ptlen > (unsigned long)ocb->block_len) {
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if ((err = ocb_encrypt(ocb, pt, ct)) != CRYPT_OK) {
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goto __ERR;
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}
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ptlen -= ocb->block_len;
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pt += ocb->block_len;
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ct += ocb->block_len;
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}
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err = ocb_done_encrypt(ocb, pt, ptlen, ct, tag, taglen);
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__ERR:
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#ifdef CLEAN_STACK
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zeromem(ocb, sizeof(ocb_state));
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#endif
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XFREE(ocb);
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return err;
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}
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#endif
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