+++ /dev/null
-/* LibTomCrypt, modular cryptographic library -- Tom St Denis
- *
- * LibTomCrypt is a library that provides various cryptographic
- * algorithms in a highly modular and flexible manner.
- *
- * The library is free for all purposes without any express
- * guarantee it works.
- */
-
-/**
- @file ocb3_encrypt.c
- OCB implementation, encrypt data, by Tom St Denis
-*/
-#include "tomcrypt.h"
-
-#ifdef LTC_OCB3_MODE
-
-/**
- Encrypt blocks of data with OCB
- @param ocb The OCB state
- @param pt The plaintext (length multiple of the block size of the block cipher)
- @param ptlen The length of the input (octets)
- @param ct [out] The ciphertext (same size as the pt)
- @return CRYPT_OK if successful
-*/
-int ocb3_encrypt(ocb3_state *ocb, const unsigned char *pt, unsigned long ptlen, unsigned char *ct)
-{
- unsigned char tmp[MAXBLOCKSIZE];
- int err, i, full_blocks;
- unsigned char *pt_b, *ct_b;
-
- LTC_ARGCHK(ocb != NULL);
- if (ptlen == 0) return CRYPT_OK; /* no data, nothing to do */
- LTC_ARGCHK(pt != NULL);
- LTC_ARGCHK(ct != NULL);
-
- if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
- return err;
- }
- if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
- return CRYPT_INVALID_ARG;
- }
-
- if (ptlen % ocb->block_len) { /* ptlen has to bu multiple of block_len */
- return CRYPT_INVALID_ARG;
- }
-
- full_blocks = ptlen/ocb->block_len;
- for(i=0; i<full_blocks; i++) {
- pt_b = (unsigned char *)pt+i*ocb->block_len;
- ct_b = (unsigned char *)ct+i*ocb->block_len;
-
- /* ocb->Offset_current[] = ocb->Offset_current[] ^ Offset_{ntz(block_index)} */
- ocb3_int_xor_blocks(ocb->Offset_current, ocb->Offset_current, ocb->L_[ocb3_int_ntz(ocb->block_index)], ocb->block_len);
-
- /* tmp[] = pt[] XOR ocb->Offset_current[] */
- ocb3_int_xor_blocks(tmp, pt_b, ocb->Offset_current, ocb->block_len);
-
- /* encrypt */
- if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
- goto LBL_ERR;
- }
-
- /* ct[] = tmp[] XOR ocb->Offset_current[] */
- ocb3_int_xor_blocks(ct_b, tmp, ocb->Offset_current, ocb->block_len);
-
- /* ocb->checksum[] = ocb->checksum[] XOR pt[] */
- ocb3_int_xor_blocks(ocb->checksum, ocb->checksum, pt_b, ocb->block_len);
-
- ocb->block_index++;
- }
-
- err = CRYPT_OK;
-
-LBL_ERR:
-#ifdef LTC_CLEAN_STACK
- zeromem(tmp, sizeof(tmp));
-#endif
- return err;
-}
-
-#endif
-
-/* ref: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */