Mercurial > dropbear
view libtomcrypt/src/hashes/helper/hash_memory_multi.c @ 1303:eed9376a4ad6
improve algorithm list parsing
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 11 Jul 2016 22:40:38 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* 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. * * Tom St Denis, [email protected], http://libtomcrypt.com */ #include "tomcrypt.h" #include <stdarg.h> /** @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; } /* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_memory_multi.c,v $ */ /* $Revision: 1.5 $ */ /* $Date: 2006/06/16 21:53:41 $ */