remove encauth ocb ocb3

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

diff --git a/libtomcrypt/src/encauth/ocb/s_ocb_done.c b/libtomcrypt/src/encauth/ocb/s_ocb_done.c
deleted file mode 100644 (file)
index e0501ed..0000000
--- a/libtomcrypt/src/encauth/ocb/s_ocb_done.c
+++ /dev/null
@@ -1,146 +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 s_ocb_done.c
-   OCB implementation, internal helper, by Tom St Denis
-*/
-#include "tomcrypt.h"
-
-#ifdef LTC_OCB_MODE
-
-/* Since the last block is encrypted in CTR mode the same code can
- * be used to finish a decrypt or encrypt stream.  The only difference
- * is we XOR the final ciphertext into the checksum so we have to xor it
- * before we CTR [decrypt] or after [encrypt]
- *
- * the names pt/ptlen/ct really just mean in/inlen/out but this is the way I wrote it...
- */
-
-/**
-   Shared code to finish an OCB stream
-   @param ocb    The OCB state
-   @param pt     The remaining plaintext [or input]
-   @param ptlen  The length of the input (octets)
-   @param ct     [out] The output buffer
-   @param tag    [out] The destination for the authentication tag
-   @param taglen [in/out] The max size and resulting size of the authentication tag
-   @param mode   The mode we are terminating, 0==encrypt, 1==decrypt
-   @return       CRYPT_OK if successful
-*/
-int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen,
-               unsigned char *ct, unsigned char *tag, unsigned long *taglen, int mode)
-
-{
-   unsigned char *Z, *Y, *X;
-   int err, x;
-
-   LTC_ARGCHK(ocb    != NULL);
-   LTC_ARGCHK(pt     != NULL);
-   LTC_ARGCHK(ct     != NULL);
-   LTC_ARGCHK(tag    != NULL);
-   LTC_ARGCHK(taglen != NULL);
-   if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
-      return err;
-   }
-   if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length ||
-       (int)ptlen > ocb->block_len || (int)ptlen < 0) {
-      return CRYPT_INVALID_ARG;
-   }
-
-   /* allocate ram */
-   Z = XMALLOC(MAXBLOCKSIZE);
-   Y = XMALLOC(MAXBLOCKSIZE);
-   X = XMALLOC(MAXBLOCKSIZE);
-   if (X == NULL || Y == NULL || Z == NULL) {
-      if (X != NULL) {
-         XFREE(X);
-      }
-      if (Y != NULL) {
-         XFREE(Y);
-      }
-      if (Z != NULL) {
-         XFREE(Z);
-      }
-      return CRYPT_MEM;
-   }
-
-   /* compute X[m] = len(pt[m]) XOR Lr XOR Z[m] */
-   ocb_shift_xor(ocb, X);
-   XMEMCPY(Z, X, ocb->block_len);
-
-   X[ocb->block_len-1] ^= (ptlen*8)&255;
-   X[ocb->block_len-2] ^= ((ptlen*8)>>8)&255;
-   for (x = 0; x < ocb->block_len; x++) {
-       X[x] ^= ocb->Lr[x];
-   }
-
-   /* Y[m] = E(X[m])) */
-   if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(X, Y, &ocb->key)) != CRYPT_OK) {
-      goto error;
-   }
-
-   if (mode == 1) {
-      /* decrypt mode, so let's xor it first */
-      /* xor C[m] into checksum */
-      for (x = 0; x < (int)ptlen; x++) {
-         ocb->checksum[x] ^= ct[x];
-      }
-   }
-
-   /* C[m] = P[m] xor Y[m] */
-   for (x = 0; x < (int)ptlen; x++) {
-       ct[x] = pt[x] ^ Y[x];
-   }
-
-   if (mode == 0) {
-      /* encrypt mode */
-      /* xor C[m] into checksum */
-      for (x = 0; x < (int)ptlen; x++) {
-          ocb->checksum[x] ^= ct[x];
-      }
-   }
-
-   /* xor Y[m] and Z[m] into checksum */
-   for (x = 0; x < ocb->block_len; x++) {
-       ocb->checksum[x] ^= Y[x] ^ Z[x];
-   }
-
-   /* encrypt checksum, er... tag!! */
-   if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->checksum, X, &ocb->key)) != CRYPT_OK) {
-      goto error;
-   }
-   cipher_descriptor[ocb->cipher].done(&ocb->key);
-
-   /* now store it */
-   for (x = 0; x < ocb->block_len && x < (int)*taglen; x++) {
-       tag[x] = X[x];
-   }
-   *taglen = x;
-
-#ifdef LTC_CLEAN_STACK
-   zeromem(X, MAXBLOCKSIZE);
-   zeromem(Y, MAXBLOCKSIZE);
-   zeromem(Z, MAXBLOCKSIZE);
-   zeromem(ocb, sizeof(*ocb));
-#endif
-error:
-   XFREE(X);
-   XFREE(Y);
-   XFREE(Z);
-
-   return err;
-}
-
-#endif
-
-
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */