1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
6 * The library is free for all purposes without any express
12 #ifdef LTC_HASH_HELPERS
14 @file hash_memory_multi.c
15 Hash (multiple buffers) memory helper, Tom St Denis
19 Hash multiple (non-adjacent) blocks of memory at once.
20 @param hash The index of the hash you wish to use
21 @param out [out] Where to store the digest
22 @param outlen [in/out] Max size and resulting size of the digest
23 @param in The data you wish to hash
24 @param inlen The length of the data to hash (octets)
25 @param ... tuples of (data,len) pairs to hash, terminated with a (NULL,x) (x=don't care)
26 @return CRYPT_OK if successful
28 int hash_memory_multi(int hash, unsigned char *out, unsigned long *outlen,
29 const unsigned char *in, unsigned long inlen, ...)
34 const unsigned char *curptr;
37 LTC_ARGCHK(in != NULL);
38 LTC_ARGCHK(out != NULL);
39 LTC_ARGCHK(outlen != NULL);
41 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
45 if (*outlen < hash_descriptor[hash].hashsize) {
46 *outlen = hash_descriptor[hash].hashsize;
47 return CRYPT_BUFFER_OVERFLOW;
50 md = XMALLOC(sizeof(hash_state));
55 if ((err = hash_descriptor[hash].init(md)) != CRYPT_OK) {
59 va_start(args, inlen);
64 if ((err = hash_descriptor[hash].process(md, curptr, curlen)) != CRYPT_OK) {
68 curptr = va_arg(args, const unsigned char*);
72 curlen = va_arg(args, unsigned long);
74 err = hash_descriptor[hash].done(md, out);
75 *outlen = hash_descriptor[hash].hashsize;
77 #ifdef LTC_CLEAN_STACK
78 zeromem(md, sizeof(hash_state));
84 #endif /* #ifdef LTC_HASH_HELPERS */
86 /* ref: $Format:%D$ */
87 /* git commit: $Format:%H$ */
88 /* commit time: $Format:%ai$ */