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89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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#include <stdarg.h>
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#ifdef LTC_HASH_HELPERS
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/**
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@file hash_memory_multi.c
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Hash (multiple buffers) memory helper, Tom St Denis
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*/
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/**
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Hash multiple (non-adjacent) blocks of memory at once.
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@param hash The index of the hash you wish to use
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@param out [out] Where to store the digest
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@param outlen [in/out] Max size and resulting size of the digest
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@param in The data you wish to hash
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@param inlen The length of the data to hash (octets)
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@param ... tuples of (data,len) pairs to hash, terminated with a (NULL,x) (x=don't care)
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@return CRYPT_OK if successful
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*/
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int hash_memory_multi(int hash, unsigned char *out, unsigned long *outlen,
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const unsigned char *in, unsigned long inlen, ...)
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{
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hash_state *md;
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int err;
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va_list args;
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const unsigned char *curptr;
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unsigned long curlen;
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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return err;
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}
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if (*outlen < hash_descriptor[hash].hashsize) {
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*outlen = hash_descriptor[hash].hashsize;
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return CRYPT_BUFFER_OVERFLOW;
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}
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md = XMALLOC(sizeof(hash_state));
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if (md == NULL) {
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return CRYPT_MEM;
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}
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if ((err = hash_descriptor[hash].init(md)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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va_start(args, inlen);
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curptr = in;
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curlen = inlen;
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for (;;) {
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/* process buf */
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if ((err = hash_descriptor[hash].process(md, curptr, curlen)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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/* step to next */
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curptr = va_arg(args, const unsigned char*);
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if (curptr == NULL) {
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break;
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}
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curlen = va_arg(args, unsigned long);
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}
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err = hash_descriptor[hash].done(md, out);
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*outlen = hash_descriptor[hash].hashsize;
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LBL_ERR:
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#ifdef LTC_CLEAN_STACK
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zeromem(md, sizeof(hash_state));
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#endif
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XFREE(md);
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va_end(args);
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return err;
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}
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#endif /* #ifdef LTC_HASH_HELPERS */
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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