Mercurial > dropbear

annotate src/mac/omac/omac_memory_multi.c @ 192:9cc34777b479 libtomcrypt

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propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 May 2005 06:36:47 +0000
parents 1c15b283127b
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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 omac_memory_multi.c
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16 OMAC1 support, process multiple blocks of memory, Tom St Denis
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17 */
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18
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19 #ifdef OMAC
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20
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21 /**
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22 OMAC multiple blocks of memory
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23 @param cipher The index of the desired cipher
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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] The destination of the authentication tag
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27 @param outlen [in/out] The max size and resulting size of the authentication tag (octets)
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28 @param in The data to send through OMAC
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29 @param inlen The length of the data to send through OMAC (octets)
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30 @param ... tuples of (data,len) pairs to OMAC, 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 omac_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 omac_state *omac;
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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 omac state */
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50 omac = XMALLOC(sizeof(omac_state));
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51 if (omac == NULL) {
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52 return CRYPT_MEM;
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53 }
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54
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55 /* omac process the message */
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56 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
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57 goto LBL_ERR;
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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 = omac_process(omac, 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 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
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75 goto LBL_ERR;
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76 }
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77 LBL_ERR:
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78 #ifdef LTC_CLEAN_STACK
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79 zeromem(omac, sizeof(omac_state));
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80 #endif
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81 XFREE(omac);
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82 va_end(args);
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83 return err;
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84 }
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85
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86 #endif