Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_memory_multi.c @ 1056:a2bfd4374878 nocircbuffer

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Avoid malloc in hmac
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 14:46:04 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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.com
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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 hmac_memory_multi.c
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16 HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer
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17 */
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18
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19 #ifdef LTC_HMAC
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20
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21 /**
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22 HMAC multiple blocks of memory to produce the authentication tag
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23 @param hash The index of the hash to use
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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 of the authentication tag
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27 @param outlen [in/out] Max size and resulting size of authentication tag
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28 @param in The data to HMAC
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29 @param inlen The length of the data to HMAC (octets)
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30 @param ... tuples of (data,len) pairs to HMAC, 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 hmac_memory_multi(int hash,
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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 {
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39 hmac_state *hmac;
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40 int err;
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41 va_list args;
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42 const unsigned char *curptr;
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43 unsigned long curlen;
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44
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45 LTC_ARGCHK(key != NULL);
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46 LTC_ARGCHK(in != NULL);
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47 LTC_ARGCHK(out != NULL);
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48 LTC_ARGCHK(outlen != NULL);
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49
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50 /* allocate ram for hmac state */
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51 hmac = XMALLOC(sizeof(hmac_state));
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52 if (hmac == NULL) {
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53 return CRYPT_MEM;
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54 }
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55
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56 if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
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57 goto LBL_ERR;
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58 }
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59
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60 va_start(args, inlen);
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61 curptr = in;
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62 curlen = inlen;
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63 for (;;) {
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64 /* process buf */
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65 if ((err = hmac_process(hmac, curptr, curlen)) != CRYPT_OK) {
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66 goto LBL_ERR;
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67 }
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68 /* step to next */
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69 curptr = va_arg(args, const unsigned char*);
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70 if (curptr == NULL) {
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71 break;
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72 }
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73 curlen = va_arg(args, unsigned long);
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74 }
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75 if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
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76 goto LBL_ERR;
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77 }
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78 LBL_ERR:
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79 #ifdef LTC_CLEAN_STACK
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80 zeromem(hmac, sizeof(hmac_state));
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81 #endif
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82 XFREE(hmac);
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83 va_end(args);
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84 return err;
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85 }
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86
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87 #endif
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88
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89
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory_multi.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
91 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
92 /* $Date: 2006/11/03 00:39:49 $ */