Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_memory_multi.c @ 1832:a974a80f5f44

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author Matt Johnston <matt@codeconstruct.com.au>
date Tue, 12 Oct 2021 21:29:42 +0800
parents 6dba84798cd5
children
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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 */
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9 #include "tomcrypt.h"
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10 #include <stdarg.h>
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11
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12 /**
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13 @file hmac_memory_multi.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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14 HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer
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15 */
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16
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17 #ifdef LTC_HMAC
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19 /**
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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20 HMAC multiple blocks of memory to produce the authentication tag
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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21 @param hash The index of the hash to use
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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22 @param key The secret key
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23 @param keylen The length of the secret key (octets)
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24 @param out [out] Destination of the authentication tag
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25 @param outlen [in/out] Max size and resulting size of authentication tag
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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26 @param in The data to HMAC
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27 @param inlen The length of the data to HMAC (octets)
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28 @param ... tuples of (data,len) pairs to HMAC, terminated with a (NULL,x) (x=don't care)
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29 @return CRYPT_OK if successful
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30 */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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31 int hmac_memory_multi(int hash,
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32 const unsigned char *key, unsigned long keylen,
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33 unsigned char *out, unsigned long *outlen,
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34 const unsigned char *in, unsigned long inlen, ...)
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35
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36 {
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37 hmac_state *hmac;
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38 int err;
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39 va_list args;
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40 const unsigned char *curptr;
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41 unsigned long curlen;
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(in != NULL);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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45 LTC_ARGCHK(out != NULL);
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46 LTC_ARGCHK(outlen != NULL);
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47
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48 /* allocate ram for hmac state */
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49 hmac = XMALLOC(sizeof(hmac_state));
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50 if (hmac == NULL) {
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51 return CRYPT_MEM;
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52 }
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53
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54 if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
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55 goto LBL_ERR;
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56 }
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57
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58 va_start(args, inlen);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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59 curptr = in;
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60 curlen = inlen;
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61 for (;;) {
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62 /* process buf */
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63 if ((err = hmac_process(hmac, curptr, curlen)) != CRYPT_OK) {
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64 goto LBL_ERR;
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65 }
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66 /* step to next */
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67 curptr = va_arg(args, const unsigned char*);
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68 if (curptr == NULL) {
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69 break;
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70 }
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71 curlen = va_arg(args, unsigned long);
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72 }
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73 if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
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74 goto LBL_ERR;
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75 }
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76 LBL_ERR:
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77 #ifdef LTC_CLEAN_STACK
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78 zeromem(hmac, sizeof(hmac_state));
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79 #endif
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80 XFREE(hmac);
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81 va_end(args);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 return err;
285
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83 }
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84
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85 #endif
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86
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87
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 /* commit time: $Format:%ai$ */