Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_verify_hash.c @ 1677:e05c0e394f1d
Make DEBUG_NOFORK a #if not #ifdef
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 21 May 2020 22:58:56 +0800 |
parents | 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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file rsa_verify_hash.c |
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13 RSA PKCS #1 v1.5 or v2 PSS signature verification, Tom St Denis and Andreas Lange |
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14 */ |
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15 |
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16 #ifdef LTC_MRSA |
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17 |
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18 /** |
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19 PKCS #1 de-sign then v1.5 or PSS depad |
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20 @param sig The signature data |
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21 @param siglen The length of the signature data (octets) |
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22 @param hash The hash of the message that was signed |
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23 @param hashlen The length of the hash of the message that was signed (octets) |
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24 @param padding Type of padding (LTC_PKCS_1_PSS, LTC_PKCS_1_V1_5 or LTC_PKCS_1_V1_5_NA1) |
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25 @param hash_idx The index of the desired hash |
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26 @param saltlen The length of the salt used during signature |
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27 @param stat [out] The result of the signature comparison, 1==valid, 0==invalid |
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28 @param key The public RSA key corresponding to the key that performed the signature |
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29 @return CRYPT_OK on success (even if the signature is invalid) |
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30 */ |
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31 int rsa_verify_hash_ex(const unsigned char *sig, unsigned long siglen, |
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32 const unsigned char *hash, unsigned long hashlen, |
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33 int padding, |
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34 int hash_idx, unsigned long saltlen, |
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35 int *stat, rsa_key *key) |
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36 { |
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37 unsigned long modulus_bitlen, modulus_bytelen, x; |
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38 int err; |
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39 unsigned char *tmpbuf; |
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40 |
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41 LTC_ARGCHK(hash != NULL); |
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42 LTC_ARGCHK(sig != NULL); |
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43 LTC_ARGCHK(stat != NULL); |
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44 LTC_ARGCHK(key != NULL); |
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45 |
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46 /* default to invalid */ |
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47 *stat = 0; |
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48 |
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49 /* valid padding? */ |
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50 |
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51 if ((padding != LTC_PKCS_1_V1_5) && |
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52 (padding != LTC_PKCS_1_PSS) && |
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53 (padding != LTC_PKCS_1_V1_5_NA1)) { |
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54 return CRYPT_PK_INVALID_PADDING; |
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55 } |
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56 |
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57 if (padding != LTC_PKCS_1_V1_5_NA1) { |
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58 /* valid hash ? */ |
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59 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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60 return err; |
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61 } |
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62 } |
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63 |
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64 /* get modulus len in bits */ |
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65 modulus_bitlen = mp_count_bits( (key->N)); |
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66 |
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67 /* outlen must be at least the size of the modulus */ |
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68 modulus_bytelen = mp_unsigned_bin_size( (key->N)); |
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69 if (modulus_bytelen != siglen) { |
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70 return CRYPT_INVALID_PACKET; |
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71 } |
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72 |
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73 /* allocate temp buffer for decoded sig */ |
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74 tmpbuf = XMALLOC(siglen); |
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75 if (tmpbuf == NULL) { |
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76 return CRYPT_MEM; |
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77 } |
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78 |
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79 /* RSA decode it */ |
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80 x = siglen; |
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81 if ((err = ltc_mp.rsa_me(sig, siglen, tmpbuf, &x, PK_PUBLIC, key)) != CRYPT_OK) { |
285
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diff
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|
82 XFREE(tmpbuf); |
1b9e69c058d2
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|
83 return err; |
1b9e69c058d2
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|
84 } |
382
0cbe8f6dbf9e
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diff
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|
85 |
0cbe8f6dbf9e
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diff
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|
86 /* make sure the output is the right size */ |
0cbe8f6dbf9e
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87 if (x != siglen) { |
0cbe8f6dbf9e
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|
88 XFREE(tmpbuf); |
0cbe8f6dbf9e
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|
89 return CRYPT_INVALID_PACKET; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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|
90 } |
0cbe8f6dbf9e
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|
91 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
92 if (padding == LTC_PKCS_1_PSS) { |
382
0cbe8f6dbf9e
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|
93 /* PSS decode and verify it */ |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
94 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
95 if(modulus_bitlen%8 == 1){ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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96 err = pkcs_1_pss_decode(hash, hashlen, tmpbuf+1, x-1, saltlen, hash_idx, modulus_bitlen, stat); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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97 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
98 else{ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
99 err = pkcs_1_pss_decode(hash, hashlen, tmpbuf, x, saltlen, hash_idx, modulus_bitlen, stat); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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100 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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101 |
382
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102 } else { |
1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
103 /* PKCS #1 v1.5 decode it */ |
382
0cbe8f6dbf9e
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|
104 unsigned char *out; |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
105 unsigned long outlen; |
382
0cbe8f6dbf9e
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|
106 int decoded; |
0cbe8f6dbf9e
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|
107 |
0cbe8f6dbf9e
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|
108 /* allocate temp buffer for decoded hash */ |
0cbe8f6dbf9e
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|
109 outlen = ((modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0)) - 3; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
110 out = XMALLOC(outlen); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
111 if (out == NULL) { |
0cbe8f6dbf9e
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|
112 err = CRYPT_MEM; |
0cbe8f6dbf9e
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113 goto bail_2; |
0cbe8f6dbf9e
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|
114 } |
0cbe8f6dbf9e
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|
115 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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116 if ((err = pkcs_1_v1_5_decode(tmpbuf, x, LTC_PKCS_1_EMSA, modulus_bitlen, out, &outlen, &decoded)) != CRYPT_OK) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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117 XFREE(out); |
382
0cbe8f6dbf9e
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118 goto bail_2; |
0cbe8f6dbf9e
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119 } |
0cbe8f6dbf9e
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|
120 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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121 if (padding == LTC_PKCS_1_V1_5) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
122 unsigned long loid[16], reallen; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
123 ltc_asn1_list digestinfo[2], siginfo[2]; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
124 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
125 /* not all hashes have OIDs... so sad */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
126 if (hash_descriptor[hash_idx].OIDlen == 0) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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1435
diff
changeset
|
127 err = CRYPT_INVALID_ARG; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
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|
128 goto bail_2; |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
changeset
|
129 } |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
130 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
131 /* now we must decode out[0...outlen-1] using ASN.1, test the OID and then test the hash */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
132 /* construct the SEQUENCE |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
133 SEQUENCE { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
134 SEQUENCE {hashoid OID |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
135 blah NULL |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
136 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
137 hash OCTET STRING |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
138 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
139 */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
140 LTC_SET_ASN1(digestinfo, 0, LTC_ASN1_OBJECT_IDENTIFIER, loid, sizeof(loid)/sizeof(loid[0])); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
141 LTC_SET_ASN1(digestinfo, 1, LTC_ASN1_NULL, NULL, 0); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
142 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 2); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
143 LTC_SET_ASN1(siginfo, 1, LTC_ASN1_OCTET_STRING, tmpbuf, siglen); |
382
0cbe8f6dbf9e
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285
diff
changeset
|
144 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
145 if ((err = der_decode_sequence(out, outlen, siginfo, 2)) != CRYPT_OK) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
146 /* fallback to Legacy:missing NULL */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
147 LTC_SET_ASN1(siginfo, 0, LTC_ASN1_SEQUENCE, digestinfo, 1); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
148 if ((err = der_decode_sequence(out, outlen, siginfo, 2)) != CRYPT_OK) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
149 XFREE(out); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
150 goto bail_2; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
151 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
152 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
153 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
154 if ((err = der_length_sequence(siginfo, 2, &reallen)) != CRYPT_OK) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
155 XFREE(out); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
156 goto bail_2; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
157 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
158 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
159 /* test OID */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
160 if ((reallen == outlen) && |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
161 (digestinfo[0].size == hash_descriptor[hash_idx].OIDlen) && |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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285
diff
changeset
|
162 (XMEMCMP(digestinfo[0].data, hash_descriptor[hash_idx].OID, sizeof(unsigned long) * hash_descriptor[hash_idx].OIDlen) == 0) && |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
163 (siginfo[1].size == hashlen) && |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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285
diff
changeset
|
164 (XMEMCMP(siginfo[1].data, hash, hashlen) == 0)) { |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
165 *stat = 1; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
166 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
167 } else { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
168 /* only check if the hash is equal */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
169 if ((hashlen == outlen) && |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
170 (XMEMCMP(out, hash, hashlen) == 0)) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
171 *stat = 1; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
172 } |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
173 } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
174 |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
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175 #ifdef LTC_CLEAN_STACK |
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176 zeromem(out, outlen); |
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177 #endif |
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178 XFREE(out); |
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179 } |
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180 |
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181 bail_2: |
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182 #ifdef LTC_CLEAN_STACK |
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183 zeromem(tmpbuf, siglen); |
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184 #endif |
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185 XFREE(tmpbuf); |
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186 return err; |
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187 } |
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188 |
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189 #endif /* LTC_MRSA */ |
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190 |
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191 /* ref: $Format:%D$ */ |
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192 /* git commit: $Format:%H$ */ |
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193 /* commit time: $Format:%ai$ */ |