Mercurial > dropbear

annotate src/mac/pmac/pmac_memory_multi.c @ 212:a3e31d3983cb libtomcrypt

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merge of 24ccd6df75086f1028c185f4ad5946f449bf2e05 and cc138b6aed8d554f52f041a11afecb95e95ed3b8
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 13:24:05 +0000
parents 39d5d58461d6
children
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191
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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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 /**
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15 @file pmac_memory_multi.c
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16 PMAC implementation, process multiple blocks of memory, by Tom St Denis
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17 */
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18
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19 #ifdef PMAC
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20
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21 /**
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22 PMAC multiple blocks of memory
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23 @param cipher The index of the cipher desired
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24 @param key The secret key
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25 @param keylen The length of the secret key (octets)
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26 @param out [out] Destination for the authentication tag
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27 @param outlen [in/out] The max size and resulting size of the authentication tag
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28 @param in The data you wish to send through PMAC
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29 @param inlen The length of data you wish to send through PMAC (octets)
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30 @param ... tuples of (data,len) pairs to PMAC, terminated with a (NULL,x) (x=don't care)
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31 @return CRYPT_OK if successful
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32 */
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33 int pmac_memory_multi(int cipher,
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34 const unsigned char *key, unsigned long keylen,
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35 unsigned char *out, unsigned long *outlen,
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36 const unsigned char *in, unsigned long inlen, ...)
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37 {
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38 int err;
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39 pmac_state *pmac;
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40 va_list args;
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41 const unsigned char *curptr;
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42 unsigned long curlen;
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43
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44 LTC_ARGCHK(key != NULL);
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45 LTC_ARGCHK(in != NULL);
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46 LTC_ARGCHK(out != NULL);
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47 LTC_ARGCHK(outlen != NULL);
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48
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49 /* allocate ram for pmac state */
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50 pmac = XMALLOC(sizeof(pmac_state));
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51 if (pmac == 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 = pmac_init(pmac, cipher, key, keylen)) != CRYPT_OK) {
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56 goto LBL_ERR;
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57 }
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58 va_start(args, inlen);
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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 = pmac_process(pmac, 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 = pmac_done(pmac, 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(pmac, sizeof(pmac_state));
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79 #endif
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80 XFREE(pmac);
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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 #endif
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86
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87 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_memory_multi.c,v $ */
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88 /* $Revision: 1.4 $ */
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89 /* $Date: 2005/05/05 14:35:59 $ */