+++ /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 ocb_done_decrypt.c
- OCB implementation, terminate decryption, by Tom St Denis
-*/
-#include "tomcrypt.h"
-
-#ifdef LTC_OCB_MODE
-
-/**
- Terminate a decrypting OCB state
- @param ocb The OCB state
- @param ct The ciphertext (if any)
- @param ctlen The length of the ciphertext (octets)
- @param pt [out] The plaintext
- @param tag The authentication tag (to compare against)
- @param taglen The length of the authentication tag provided
- @param stat [out] The result of the tag comparison
- @return CRYPT_OK if the process was successful regardless if the tag is valid
-*/
-int ocb_done_decrypt(ocb_state *ocb,
- const unsigned char *ct, unsigned long ctlen,
- unsigned char *pt,
- const unsigned char *tag, unsigned long taglen, int *stat)
-{
- int err;
- unsigned char *tagbuf;
- unsigned long tagbuflen;
-
- LTC_ARGCHK(ocb != NULL);
- LTC_ARGCHK(pt != NULL);
- LTC_ARGCHK(ct != NULL);
- LTC_ARGCHK(tag != NULL);
- LTC_ARGCHK(stat != NULL);
-
- /* default to failed */
- *stat = 0;
-
- /* allocate memory */
- tagbuf = XMALLOC(MAXBLOCKSIZE);
- if (tagbuf == NULL) {
- return CRYPT_MEM;
- }
-
- tagbuflen = MAXBLOCKSIZE;
- if ((err = s_ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) {
- goto LBL_ERR;
- }
-
- if (taglen <= tagbuflen && XMEM_NEQ(tagbuf, tag, taglen) == 0) {
- *stat = 1;
- }
-
- err = CRYPT_OK;
-LBL_ERR:
-#ifdef LTC_CLEAN_STACK
- zeromem(tagbuf, MAXBLOCKSIZE);
-#endif
-
- XFREE(tagbuf);
-
- return err;
-}
-
-#endif
-
-
-/* ref: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */