Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_verify_hash.c @ 1461:fb90a5ba84e0
Merge pull request #49 from fperrad/20170812_lint
Some linting, const parameters
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 25 Jan 2018 21:55:25 +0800 |
parents | f849a5ca2efc |
children | 6dba84798cd5 |
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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://libtom.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 rsa_verify_hash.c |
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15 RSA LTC_PKCS #1 v1.5 or v2 PSS signature verification, Tom St Denis and Andreas Lange |
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16 */ |
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17 |
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18 #ifdef LTC_MRSA |
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19 |
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20 /** |
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21 LTC_PKCS #1 de-sign then v1.5 or PSS depad |
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22 @param sig The signature data |
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23 @param siglen The length of the signature data (octets) |
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24 @param hash The hash of the message that was signed |
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25 @param hashlen The length of the hash of the message that was signed (octets) |
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26 @param padding Type of padding (LTC_LTC_PKCS_1_PSS or LTC_LTC_PKCS_1_V1_5) |
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27 @param hash_idx The index of the desired hash |
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28 @param saltlen The length of the salt used during signature |
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29 @param stat [out] The result of the signature comparison, 1==valid, 0==invalid |
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30 @param key The public RSA key corresponding to the key that performed the signature |
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31 @return CRYPT_OK on success (even if the signature is invalid) |
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32 */ |
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33 int rsa_verify_hash_ex(const unsigned char *sig, unsigned long siglen, |
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34 const unsigned char *hash, unsigned long hashlen, |
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35 int padding, |
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36 int hash_idx, unsigned long saltlen, |
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37 int *stat, rsa_key *key) |
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38 { |
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39 unsigned long modulus_bitlen, modulus_bytelen, x; |
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40 int err; |
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41 unsigned char *tmpbuf; |
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42 |
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43 LTC_ARGCHK(hash != NULL); |
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44 LTC_ARGCHK(sig != NULL); |
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45 LTC_ARGCHK(stat != NULL); |
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46 LTC_ARGCHK(key != NULL); |
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47 |
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48 /* default to invalid */ |
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49 *stat = 0; |
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50 |
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51 /* valid padding? */ |
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52 |
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53 if ((padding != LTC_LTC_PKCS_1_V1_5) && |
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54 (padding != LTC_LTC_PKCS_1_PSS)) { |
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55 return CRYPT_PK_INVALID_PADDING; |
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56 } |
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57 |
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58 if (padding == LTC_LTC_PKCS_1_PSS) { |
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59 /* valid hash ? */ |
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60 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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61 return err; |
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62 } |
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63 } |
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64 |
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65 /* get modulus len in bits */ |
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66 modulus_bitlen = mp_count_bits( (key->N)); |
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67 |
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68 /* outlen must be at least the size of the modulus */ |
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69 modulus_bytelen = mp_unsigned_bin_size( (key->N)); |
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70 if (modulus_bytelen != siglen) { |
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71 return CRYPT_INVALID_PACKET; |
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72 } |
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73 |
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74 /* allocate temp buffer for decoded sig */ |
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75 tmpbuf = XMALLOC(siglen); |
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76 if (tmpbuf == NULL) { |
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77 return CRYPT_MEM; |
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78 } |
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79 |
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80 /* RSA decode it */ |
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parents:
diff
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|
81 x = siglen; |
382
0cbe8f6dbf9e
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|
82 if ((err = ltc_mp.rsa_me(sig, siglen, tmpbuf, &x, PK_PUBLIC, key)) != CRYPT_OK) { |
285
1b9e69c058d2
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parents:
diff
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|
83 XFREE(tmpbuf); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
84 return err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
85 } |
382
0cbe8f6dbf9e
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285
diff
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|
86 |
0cbe8f6dbf9e
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diff
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|
87 /* make sure the output is the right size */ |
0cbe8f6dbf9e
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|
88 if (x != siglen) { |
0cbe8f6dbf9e
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285
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|
89 XFREE(tmpbuf); |
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|
90 return CRYPT_INVALID_PACKET; |
0cbe8f6dbf9e
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|
91 } |
0cbe8f6dbf9e
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92 |
1435
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update to libtomcrypt 1.17 (with Dropbear changes)
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382
diff
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|
93 if (padding == LTC_LTC_PKCS_1_PSS) { |
382
0cbe8f6dbf9e
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|
94 /* PSS decode and verify it */ |
0cbe8f6dbf9e
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95 err = pkcs_1_pss_decode(hash, hashlen, tmpbuf, x, saltlen, hash_idx, modulus_bitlen, stat); |
0cbe8f6dbf9e
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96 } else { |
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|
97 /* LTC_PKCS #1 v1.5 decode it */ |
382
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|
98 unsigned char *out; |
0cbe8f6dbf9e
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99 unsigned long outlen, loid[16]; |
0cbe8f6dbf9e
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|
100 int decoded; |
0cbe8f6dbf9e
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101 ltc_asn1_list digestinfo[2], siginfo[2]; |
0cbe8f6dbf9e
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102 |
0cbe8f6dbf9e
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103 /* not all hashes have OIDs... so sad */ |
0cbe8f6dbf9e
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104 if (hash_descriptor[hash_idx].OIDlen == 0) { |
0cbe8f6dbf9e
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105 err = CRYPT_INVALID_ARG; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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106 goto bail_2; |
0cbe8f6dbf9e
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|
107 } |
0cbe8f6dbf9e
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108 |
0cbe8f6dbf9e
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|
109 /* allocate temp buffer for decoded hash */ |
0cbe8f6dbf9e
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110 outlen = ((modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0)) - 3; |
0cbe8f6dbf9e
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111 out = XMALLOC(outlen); |
0cbe8f6dbf9e
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112 if (out == NULL) { |
0cbe8f6dbf9e
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113 err = CRYPT_MEM; |
0cbe8f6dbf9e
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114 goto bail_2; |
0cbe8f6dbf9e
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115 } |
0cbe8f6dbf9e
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116 |
1435
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update to libtomcrypt 1.17 (with Dropbear changes)
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diff
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117 if ((err = pkcs_1_v1_5_decode(tmpbuf, x, LTC_LTC_PKCS_1_EMSA, modulus_bitlen, out, &outlen, &decoded)) != CRYPT_OK) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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118 XFREE(out); |
0cbe8f6dbf9e
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|
119 goto bail_2; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
120 } |
0cbe8f6dbf9e
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121 |
0cbe8f6dbf9e
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diff
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|
122 /* now we must decode out[0...outlen-1] using ASN.1, test the OID and then test the hash */ |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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|
123 /* construct the SEQUENCE |
0cbe8f6dbf9e
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|
124 SEQUENCE { |
0cbe8f6dbf9e
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|
125 SEQUENCE {hashoid OID |
0cbe8f6dbf9e
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|
126 blah NULL |
0cbe8f6dbf9e
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diff
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|
127 } |
0cbe8f6dbf9e
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diff
changeset
|
128 hash OCTET STRING |
0cbe8f6dbf9e
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diff
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|
129 } |
0cbe8f6dbf9e
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diff
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|
130 */ |
0cbe8f6dbf9e
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|
131 LTC_SET_ASN1(digestinfo, 0, LTC_ASN1_OBJECT_IDENTIFIER, loid, sizeof(loid)/sizeof(loid[0])); |
0cbe8f6dbf9e
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|
132 LTC_SET_ASN1(digestinfo, 1, LTC_ASN1_NULL, NULL, 0); |
0cbe8f6dbf9e
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diff
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|
133 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 2); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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|
134 LTC_SET_ASN1(siginfo, 1, LTC_ASN1_OCTET_STRING, tmpbuf, siglen); |
0cbe8f6dbf9e
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diff
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|
135 |
0cbe8f6dbf9e
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diff
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|
136 if ((err = der_decode_sequence(out, outlen, siginfo, 2)) != CRYPT_OK) { |
0cbe8f6dbf9e
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|
137 XFREE(out); |
0cbe8f6dbf9e
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|
138 goto bail_2; |
0cbe8f6dbf9e
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diff
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|
139 } |
0cbe8f6dbf9e
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|
140 |
0cbe8f6dbf9e
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|
141 /* test OID */ |
0cbe8f6dbf9e
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|
142 if ((digestinfo[0].size == hash_descriptor[hash_idx].OIDlen) && |
0cbe8f6dbf9e
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|
143 (XMEMCMP(digestinfo[0].data, hash_descriptor[hash_idx].OID, sizeof(unsigned long) * hash_descriptor[hash_idx].OIDlen) == 0) && |
0cbe8f6dbf9e
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diff
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|
144 (siginfo[1].size == hashlen) && |
0cbe8f6dbf9e
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diff
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|
145 (XMEMCMP(siginfo[1].data, hash, hashlen) == 0)) { |
0cbe8f6dbf9e
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|
146 *stat = 1; |
0cbe8f6dbf9e
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|
147 } |
0cbe8f6dbf9e
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|
148 |
0cbe8f6dbf9e
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|
149 #ifdef LTC_CLEAN_STACK |
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|
150 zeromem(out, outlen); |
0cbe8f6dbf9e
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|
151 #endif |
0cbe8f6dbf9e
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|
152 XFREE(out); |
0cbe8f6dbf9e
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diff
changeset
|
153 } |
0cbe8f6dbf9e
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diff
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|
154 |
0cbe8f6dbf9e
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|
155 bail_2: |
0cbe8f6dbf9e
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|
156 #ifdef LTC_CLEAN_STACK |
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|
157 zeromem(tmpbuf, siglen); |
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158 #endif |
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159 XFREE(tmpbuf); |
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160 return err; |
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161 } |
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162 |
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163 #endif /* LTC_MRSA */ |
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164 |
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165 /* $Source$ */ |
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166 /* $Revision$ */ |
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167 /* $Date$ */ |