remove encauth ocb ocb3

[zpackage] / libtomcrypt / src / encauth / ocb3 / ocb3_decrypt.c

diff --git a/libtomcrypt/src/encauth/ocb3/ocb3_decrypt.c b/libtomcrypt/src/encauth/ocb3/ocb3_decrypt.c
deleted file mode 100644 (file)
index 4973bd2..0000000
--- a/libtomcrypt/src/encauth/ocb3/ocb3_decrypt.c
+++ /dev/null
@@ -1,86 +0,0 @@
-/* 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_decrypt.c
-   OCB implementation, decrypt data, by Tom St Denis
-*/
-#include "tomcrypt.h"
-
-#ifdef LTC_OCB3_MODE
-
-/**
-   Decrypt blocks of ciphertext with OCB
-   @param ocb     The OCB state
-   @param ct      The ciphertext (length multiple of the block size of the block cipher)
-   @param ctlen   The length of the input (octets)
-   @param pt      [out] The plaintext (length of ct)
-   @return CRYPT_OK if successful
-*/
-int ocb3_decrypt(ocb3_state *ocb, const unsigned char *ct, unsigned long ctlen, unsigned char *pt)
-{
-   unsigned char tmp[MAXBLOCKSIZE];
-   int err, i, full_blocks;
-   unsigned char *pt_b, *ct_b;
-
-   LTC_ARGCHK(ocb != NULL);
-   if (ctlen == 0) return CRYPT_OK; /* no data, nothing to do */
-   LTC_ARGCHK(ct != NULL);
-   LTC_ARGCHK(pt != 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 (ctlen % ocb->block_len) { /* ctlen has to bu multiple of block_len */
-      return CRYPT_INVALID_ARG;
-   }
-
-   full_blocks = ctlen/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[] = ct[] XOR ocb->Offset_current[] */
-     ocb3_int_xor_blocks(tmp, ct_b, ocb->Offset_current, ocb->block_len);
-
-     /* decrypt */
-     if ((err = cipher_descriptor[ocb->cipher].ecb_decrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
-        goto LBL_ERR;
-     }
-
-     /* pt[] = tmp[] XOR ocb->Offset_current[] */
-     ocb3_int_xor_blocks(pt_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: $Format:%ai$ */