Mercurial > dropbear

annotate src/pk/pkcs1/pkcs_1_mgf1.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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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
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13 /**
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14 @file pkcs_1_mgf1.c
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15 The Mask Generation Function (MGF1) for PKCS #1, Tom St Denis
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16 */
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17
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18 #ifdef PKCS_1
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19
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20 /**
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21 Perform PKCS #1 MGF1 (internal)
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22 @param seed The seed for MGF1
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23 @param seedlen The length of the seed
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24 @param hash_idx The index of the hash desired
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25 @param mask [out] The destination
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26 @param masklen The length of the mask desired
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27 @return CRYPT_OK if successful
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28 */
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29 int pkcs_1_mgf1(const unsigned char *seed, unsigned long seedlen,
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30 int hash_idx,
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31 unsigned char *mask, unsigned long masklen)
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32 {
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33 unsigned long hLen, x;
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34 ulong32 counter;
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35 int err;
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36 hash_state *md;
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37 unsigned char *buf;
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38
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39 LTC_ARGCHK(seed != NULL);
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40 LTC_ARGCHK(mask != NULL);
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41
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42 /* ensure valid hash */
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43 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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44 return err;
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45 }
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46
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47 /* get hash output size */
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48 hLen = hash_descriptor[hash_idx].hashsize;
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49
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50 /* allocate memory */
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51 md = XMALLOC(sizeof(hash_state));
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52 buf = XMALLOC(hLen);
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53 if (md == NULL || buf == NULL) {
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54 if (md != NULL) {
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55 XFREE(md);
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56 }
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57 if (buf != NULL) {
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58 XFREE(buf);
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59 }
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60 return CRYPT_MEM;
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61 }
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62
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63 /* start counter */
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64 counter = 0;
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65
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66 while (masklen > 0) {
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67 /* handle counter */
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68 STORE32H(counter, buf);
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69 ++counter;
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70
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71 /* get hash of seed || counter */
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72 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
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73 goto LBL_ERR;
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74 }
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75 if ((err = hash_descriptor[hash_idx].process(md, seed, seedlen)) != CRYPT_OK) {
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76 goto LBL_ERR;
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77 }
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78 if ((err = hash_descriptor[hash_idx].process(md, buf, 4)) != CRYPT_OK) {
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79 goto LBL_ERR;
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80 }
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81 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
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82 goto LBL_ERR;
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83 }
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84
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85 /* store it */
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86 for (x = 0; x < hLen && masklen > 0; x++, masklen--) {
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87 *mask++ = buf[x];
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88 }
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89 }
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90
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91 err = CRYPT_OK;
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92 LBL_ERR:
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93 #ifdef LTC_CLEAN_STACK
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94 zeromem(buf, hLen);
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95 zeromem(md, sizeof(hash_state));
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96 #endif
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97
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98 XFREE(buf);
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99 XFREE(md);
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100
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101 return err;
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102 }
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103
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104 #endif /* PKCS_1 */