Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c @ 1646:6d1bbe7d5fa5 DROPBEAR_2019.77

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2019.77
author Matt Johnston <matt@ucc.asn.au>
date Sat, 23 Mar 2019 21:46:29 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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11 /**
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12 @file pkcs_1_mgf1.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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13 The Mask Generation Function (MGF1) for PKCS #1, Tom St Denis
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14 */
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15
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_PKCS_1
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17
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18 /**
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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19 Perform PKCS #1 MGF1 (internal)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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20 @param hash_idx The index of the hash desired
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21 @param seed The seed for MGF1
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22 @param seedlen The length of the seed
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23 @param mask [out] The destination
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24 @param masklen The length of the mask desired
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25 @return CRYPT_OK if successful
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26 */
382
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27 int pkcs_1_mgf1(int hash_idx,
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28 const unsigned char *seed, unsigned long seedlen,
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29 unsigned char *mask, unsigned long masklen)
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30 {
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31 unsigned long hLen, x;
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32 ulong32 counter;
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33 int err;
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34 hash_state *md;
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35 unsigned char *buf;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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36
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37 LTC_ARGCHK(seed != NULL);
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38 LTC_ARGCHK(mask != NULL);
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39
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40 /* ensure valid hash */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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41 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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45 /* get hash output size */
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46 hLen = hash_descriptor[hash_idx].hashsize;
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47
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48 /* allocate memory */
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49 md = XMALLOC(sizeof(hash_state));
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50 buf = XMALLOC(hLen);
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51 if (md == NULL || buf == NULL) {
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52 if (md != NULL) {
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53 XFREE(md);
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54 }
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55 if (buf != NULL) {
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56 XFREE(buf);
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57 }
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58 return CRYPT_MEM;
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59 }
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60
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61 /* start counter */
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62 counter = 0;
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63
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64 while (masklen > 0) {
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65 /* handle counter */
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66 STORE32H(counter, buf);
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67 ++counter;
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68
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69 /* get hash of seed || counter */
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70 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
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71 goto LBL_ERR;
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72 }
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73 if ((err = hash_descriptor[hash_idx].process(md, seed, seedlen)) != CRYPT_OK) {
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74 goto LBL_ERR;
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75 }
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76 if ((err = hash_descriptor[hash_idx].process(md, buf, 4)) != CRYPT_OK) {
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77 goto LBL_ERR;
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78 }
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79 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
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80 goto LBL_ERR;
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81 }
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82
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83 /* store it */
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84 for (x = 0; x < hLen && masklen > 0; x++, masklen--) {
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85 *mask++ = buf[x];
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86 }
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87 }
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88
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89 err = CRYPT_OK;
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90 LBL_ERR:
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91 #ifdef LTC_CLEAN_STACK
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92 zeromem(buf, hLen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 zeromem(md, sizeof(hash_state));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
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95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 XFREE(md);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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100 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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101
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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diff changeset
102 #endif /* LTC_PKCS_1 */
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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103
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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104 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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105 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
106 /* commit time: $Format:%ai$ */