| // SPDX-License-Identifier: BSD-2-Clause |
| /* 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. |
| */ |
| #include "tomcrypt_private.h" |
| #include <stdarg.h> |
| |
| #ifdef LTC_HASH_HELPERS |
| /** |
| @file hash_memory_multi.c |
| Hash (multiple buffers) memory helper, Tom St Denis |
| */ |
| |
| /** |
| Hash multiple (non-adjacent) blocks of memory at once. |
| @param hash The index of the hash you wish to use |
| @param out [out] Where to store the digest |
| @param outlen [in/out] Max size and resulting size of the digest |
| @param in The data you wish to hash |
| @param inlen The length of the data to hash (octets) |
| @param ... tuples of (data,len) pairs to hash, terminated with a (NULL,x) (x=don't care) |
| @return CRYPT_OK if successful |
| */ |
| int hash_memory_multi(int hash, unsigned char *out, unsigned long *outlen, |
| const unsigned char *in, unsigned long inlen, ...) |
| { |
| hash_state *md; |
| int err; |
| va_list args; |
| const unsigned char *curptr; |
| unsigned long curlen; |
| |
| LTC_ARGCHK(in != NULL); |
| LTC_ARGCHK(out != NULL); |
| LTC_ARGCHK(outlen != NULL); |
| |
| if ((err = hash_is_valid(hash)) != CRYPT_OK) { |
| return err; |
| } |
| |
| if (*outlen < hash_descriptor[hash]->hashsize) { |
| *outlen = hash_descriptor[hash]->hashsize; |
| return CRYPT_BUFFER_OVERFLOW; |
| } |
| |
| md = XMALLOC(sizeof(hash_state)); |
| if (md == NULL) { |
| return CRYPT_MEM; |
| } |
| |
| if ((err = hash_descriptor[hash]->init(md)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| |
| va_start(args, inlen); |
| curptr = in; |
| curlen = inlen; |
| for (;;) { |
| /* process buf */ |
| if ((err = hash_descriptor[hash]->process(md, curptr, curlen)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| /* step to next */ |
| curptr = va_arg(args, const unsigned char*); |
| if (curptr == NULL) { |
| break; |
| } |
| curlen = va_arg(args, unsigned long); |
| } |
| err = hash_descriptor[hash]->done(md, out); |
| *outlen = hash_descriptor[hash]->hashsize; |
| LBL_ERR: |
| #ifdef LTC_CLEAN_STACK |
| zeromem(md, sizeof(hash_state)); |
| #endif |
| XFREE(md); |
| va_end(args); |
| return err; |
| } |
| #endif /* #ifdef LTC_HASH_HELPERS */ |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |