remove encauth ocb ocb3

[zpackage] / libtomcrypt / src / encauth / ocb / ocb_decrypt.c

diff --git a/libtomcrypt/src/encauth/ocb/ocb_decrypt.c b/libtomcrypt/src/encauth/ocb/ocb_decrypt.c
deleted file mode 100644 (file)
index 5dc8dad..0000000
--- a/libtomcrypt/src/encauth/ocb/ocb_decrypt.c
+++ /dev/null
@@ -1,77 +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 ocb_decrypt.c
-   OCB implementation, decrypt data, by Tom St Denis
-*/
-#include "tomcrypt.h"
-
-#ifdef LTC_OCB_MODE
-
-/**
-  Decrypt a block with OCB.
-  @param ocb    The OCB state
-  @param ct     The ciphertext (length of the block size of the block cipher)
-  @param pt     [out] The plaintext (length of ct)
-  @return CRYPT_OK if successful
-*/
-int ocb_decrypt(ocb_state *ocb, const unsigned char *ct, unsigned char *pt)
-{
-   unsigned char Z[MAXBLOCKSIZE], tmp[MAXBLOCKSIZE];
-   int err, x;
-
-   LTC_ARGCHK(ocb != NULL);
-   LTC_ARGCHK(pt  != NULL);
-   LTC_ARGCHK(ct  != NULL);
-
-   /* check if valid cipher */
-   if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
-      return err;
-   }
-   LTC_ARGCHK(cipher_descriptor[ocb->cipher].ecb_decrypt != NULL);
-
-   /* check length */
-   if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
-      return CRYPT_INVALID_ARG;
-   }
-
-   /* Get Z[i] value */
-   ocb_shift_xor(ocb, Z);
-
-   /* xor ct in, encrypt, xor Z out */
-   for (x = 0; x < ocb->block_len; x++) {
-       tmp[x] = ct[x] ^ Z[x];
-   }
-   if ((err = cipher_descriptor[ocb->cipher].ecb_decrypt(tmp, pt, &ocb->key)) != CRYPT_OK) {
-      return err;
-   }
-   for (x = 0; x < ocb->block_len; x++) {
-       pt[x] ^= Z[x];
-   }
-
-   /* compute checksum */
-   for (x = 0; x < ocb->block_len; x++) {
-       ocb->checksum[x] ^= pt[x];
-   }
-
-
-#ifdef LTC_CLEAN_STACK
-   zeromem(Z, sizeof(Z));
-   zeromem(tmp, sizeof(tmp));
-#endif
-   return CRYPT_OK;
-}
-
-#endif
-
-
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */