Mercurial > dropbear

annotate libtomcrypt/src/hashes/helper/hash_memory_multi.c @ 1333:6fafb500de88

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reduce buf->pos if shrinking
author Matt Johnston <matt@ucc.asn.au>
date Sat, 13 May 2017 23:43:09 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
382
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
285
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10 */
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11 #include "tomcrypt.h"
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12 #include <stdarg.h>
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13 /**
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14 @file hash_memory_multi.c
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15 Hash (multiple buffers) memory helper, Tom St Denis
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16 */
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17
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18 /**
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19 Hash multiple (non-adjacent) blocks of memory at once.
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20 @param hash The index of the hash you wish to use
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21 @param out [out] Where to store the digest
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22 @param outlen [in/out] Max size and resulting size of the digest
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23 @param in The data you wish to hash
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24 @param inlen The length of the data to hash (octets)
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25 @param ... tuples of (data,len) pairs to hash, terminated with a (NULL,x) (x=don't care)
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26 @return CRYPT_OK if successful
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27 */
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28 int hash_memory_multi(int hash, unsigned char *out, unsigned long *outlen,
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29 const unsigned char *in, unsigned long inlen, ...)
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30 {
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31 hash_state *md;
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32 int err;
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33 va_list args;
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34 const unsigned char *curptr;
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35 unsigned long curlen;
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36
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37 LTC_ARGCHK(in != NULL);
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38 LTC_ARGCHK(out != NULL);
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39 LTC_ARGCHK(outlen != NULL);
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40
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41 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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45 if (*outlen < hash_descriptor[hash].hashsize) {
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46 *outlen = hash_descriptor[hash].hashsize;
285
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47 return CRYPT_BUFFER_OVERFLOW;
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48 }
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49
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50 md = XMALLOC(sizeof(hash_state));
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51 if (md == NULL) {
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52 return CRYPT_MEM;
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53 }
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54
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55 if ((err = hash_descriptor[hash].init(md)) != CRYPT_OK) {
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56 goto LBL_ERR;
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57 }
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58
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59 va_start(args, inlen);
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60 curptr = in;
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61 curlen = inlen;
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62 for (;;) {
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63 /* process buf */
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64 if ((err = hash_descriptor[hash].process(md, curptr, curlen)) != CRYPT_OK) {
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65 goto LBL_ERR;
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66 }
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67 /* step to next */
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68 curptr = va_arg(args, const unsigned char*);
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69 if (curptr == NULL) {
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70 break;
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71 }
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72 curlen = va_arg(args, unsigned long);
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73 }
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74 err = hash_descriptor[hash].done(md, out);
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75 *outlen = hash_descriptor[hash].hashsize;
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76 LBL_ERR:
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77 #ifdef LTC_CLEAN_STACK
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78 zeromem(md, sizeof(hash_state));
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79 #endif
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80 XFREE(md);
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81 va_end(args);
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82 return err;
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83 }
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84
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85 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_memory_multi.c,v $ */
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86 /* $Revision: 1.5 $ */
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87 /* $Date: 2006/06/16 21:53:41 $ */