remove encauth ocb ocb3

[zpackage] / libtomcrypt / src / encauth / ocb3 / ocb3_decrypt_last.c

diff --git a/libtomcrypt/src/encauth/ocb3/ocb3_decrypt_last.c b/libtomcrypt/src/encauth/ocb3/ocb3_decrypt_last.c
deleted file mode 100644 (file)
index 70608dc..0000000
--- a/libtomcrypt/src/encauth/ocb3/ocb3_decrypt_last.c
+++ /dev/null
@@ -1,110 +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_last.c
-   OCB implementation, internal helper, by Karel Miko
-*/
-#include "tomcrypt.h"
-
-#ifdef LTC_OCB3_MODE
-
-/**
-   Finish an OCB (decryption) stream
-   @param ocb    The OCB state
-   @param ct     The remaining ciphertext
-   @param ctlen  The length of the ciphertext (octets)
-   @param pt     [out] The output buffer
-   @return CRYPT_OK if successful
-*/
-int ocb3_decrypt_last(ocb3_state *ocb, const unsigned char *ct, unsigned long ctlen, unsigned char *pt)
-{
-   unsigned char iOffset_star[MAXBLOCKSIZE];
-   unsigned char iPad[MAXBLOCKSIZE];
-   int err, x, full_blocks, full_blocks_len, last_block_len;
-
-   LTC_ARGCHK(ocb != NULL);
-   if (ct == NULL) LTC_ARGCHK(ctlen == 0);
-   if (ctlen != 0) {
-      LTC_ARGCHK(ct    != NULL);
-      LTC_ARGCHK(pt    != NULL);
-   }
-
-   if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
-      goto LBL_ERR;
-   }
-
-   full_blocks = ctlen/ocb->block_len;
-   full_blocks_len = full_blocks * ocb->block_len;
-   last_block_len = ctlen - full_blocks_len;
-
-   /* process full blocks first */
-   if (full_blocks>0) {
-     if ((err = ocb3_decrypt(ocb, ct, full_blocks_len, pt)) != CRYPT_OK) {
-       goto LBL_ERR;
-     }
-   }
-
-   if (last_block_len>0) {
-     /* Offset_* = Offset_m xor L_* */
-     ocb3_int_xor_blocks(iOffset_star, ocb->Offset_current, ocb->L_star, ocb->block_len);
-
-     /* Pad = ENCIPHER(K, Offset_*) */
-     if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(iOffset_star, iPad, &ocb->key)) != CRYPT_OK) {
-       goto LBL_ERR;
-     }
-
-     /* P_* = C_* xor Pad[1..bitlen(C_*)] */
-     ocb3_int_xor_blocks(pt+full_blocks_len, (unsigned char *)ct+full_blocks_len, iPad, last_block_len);
-
-     /* Checksum_* = Checksum_m xor (P_* || 1 || zeros(127-bitlen(P_*))) */
-     ocb3_int_xor_blocks(ocb->checksum, ocb->checksum, pt+full_blocks_len, last_block_len);
-     for(x=last_block_len; x<ocb->block_len; x++) {
-       if (x == last_block_len)
-         ocb->checksum[x] ^= 0x80;
-       else
-         ocb->checksum[x] ^= 0x00;
-     }
-
-     /* Tag = ENCIPHER(K, Checksum_* xor Offset_* xor L_$) xor HASH(K,A) */
-     /* at this point we calculate only: Tag_part = ENCIPHER(K, Checksum_* xor Offset_* xor L_$) */
-     for(x=0; x<ocb->block_len; x++) {
-       ocb->tag_part[x] = (ocb->checksum[x] ^ iOffset_star[x]) ^ ocb->L_dollar[x];
-     }
-     if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->tag_part, ocb->tag_part, &ocb->key)) != CRYPT_OK) {
-       goto LBL_ERR;
-     }
-   }
-   else {
-     /* Tag = ENCIPHER(K, Checksum_m xor Offset_m xor L_$) xor HASH(K,A) */
-     /* at this point we calculate only: Tag_part = ENCIPHER(K, Checksum_m xor Offset_m xor L_$) */
-     for(x=0; x<ocb->block_len; x++) {
-       ocb->tag_part[x] = (ocb->checksum[x] ^ ocb->Offset_current[x]) ^ ocb->L_dollar[x];
-     }
-     if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->tag_part, ocb->tag_part, &ocb->key)) != CRYPT_OK) {
-       goto LBL_ERR;
-     }
-   }
-
-   err = CRYPT_OK;
-
-LBL_ERR:
-#ifdef LTC_CLEAN_STACK
-   zeromem(iOffset_star, MAXBLOCKSIZE);
-   zeromem(iPad, MAXBLOCKSIZE);
-#endif
-
-   return err;
-}
-
-#endif
-
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */