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comparison libtomcrypt/src/hashes/helper/hash_memory_multi.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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children 0cbe8f6dbf9e
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281:997e6f7dc01e 285:1b9e69c058d2
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12 #include <stdarg.h>
13 /**
14 @file hash_memory_multi.c
15 Hash (multiple buffers) memory helper, Tom St Denis
16 */
17
18 /**
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
27 */
28 int hash_memory_multi(int hash, unsigned char *out, unsigned long *outlen,
29 const unsigned char *in, unsigned long inlen, ...)
30 {
31 hash_state *md;
32 int err;
33 va_list args;
34 const unsigned char *curptr;
35 unsigned long curlen;
36
37 LTC_ARGCHK(in != NULL);
38 LTC_ARGCHK(out != NULL);
39 LTC_ARGCHK(outlen != NULL);
40
41 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
42 return err;
43 }
44
45 if (*outlen < hash_descriptor[hash].hashsize) {
46 return CRYPT_BUFFER_OVERFLOW;
47 }
48
49 md = XMALLOC(sizeof(hash_state));
50 if (md == NULL) {
51 return CRYPT_MEM;
52 }
53
54 if ((err = hash_descriptor[hash].init(md)) != CRYPT_OK) {
55 goto LBL_ERR;
56 }
57
58 va_start(args, inlen);
59 curptr = in;
60 curlen = inlen;
61 for (;;) {
62 /* process buf */
63 if ((err = hash_descriptor[hash].process(md, curptr, curlen)) != CRYPT_OK) {
64 goto LBL_ERR;
65 }
66 /* step to next */
67 curptr = va_arg(args, const unsigned char*);
68 if (curptr == NULL) {
69 break;
70 }
71 curlen = va_arg(args, unsigned long);
72 }
73 err = hash_descriptor[hash].done(md, out);
74 *outlen = hash_descriptor[hash].hashsize;
75 LBL_ERR:
76 #ifdef LTC_CLEAN_STACK
77 zeromem(md, sizeof(hash_state));
78 #endif
79 XFREE(md);
80 va_end(args);
81 return err;
82 }
83
84 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_memory_multi.c,v $ */
85 /* $Revision: 1.3 $ */
86 /* $Date: 2005/05/05 14:35:58 $ */