Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_verify_hash.c @ 994:5c5ade336926
Prefer stronger algorithms in algorithm negotiation.
Prefer diffie-hellman-group14-sha1 (2048 bit) over
diffie-hellman-group1-sha1 (1024 bit).
Due to meet-in-the-middle attacks the effective key length of
three key 3DES is 112 bits. AES is stronger and faster then 3DES.
Prefer to delay the start of compression until after authentication
has completed. This avoids exposing compression code to attacks
from unauthenticated users.
(github pull request #9)
author | Fedor Brunner <fedor.brunner@azet.sk> |
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date | Fri, 23 Jan 2015 23:00:25 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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 * 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 |
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13 /** |
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14 @file rsa_verify_hash.c |
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15 RSA 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 MRSA |
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19 |
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20 /** |
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21 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_PKCS_1_PSS or 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_PKCS_1_V1_5) && |
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54 (padding != 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_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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Matt Johnston <matt@ucc.asn.au>
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diff
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|
78 } |
382
0cbe8f6dbf9e
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diff
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|
79 |
285
1b9e69c058d2
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parents:
diff
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|
80 /* RSA decode it */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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>
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|
84 return err; |
1b9e69c058d2
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parents:
diff
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|
85 } |
382
0cbe8f6dbf9e
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diff
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|
86 |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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285
diff
changeset
|
87 /* make sure the output is the right size */ |
0cbe8f6dbf9e
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|
88 if (x != siglen) { |
0cbe8f6dbf9e
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285
diff
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|
89 XFREE(tmpbuf); |
0cbe8f6dbf9e
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|
90 return CRYPT_INVALID_PACKET; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
91 } |
0cbe8f6dbf9e
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|
92 |
0cbe8f6dbf9e
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|
93 if (padding == LTC_PKCS_1_PSS) { |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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285
diff
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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
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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96 } else { |
0cbe8f6dbf9e
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|
97 /* PKCS #1 v1.5 decode it */ |
0cbe8f6dbf9e
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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
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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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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diff
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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
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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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
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
115 } |
0cbe8f6dbf9e
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116 |
0cbe8f6dbf9e
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117 if ((err = pkcs_1_v1_5_decode(tmpbuf, x, LTC_PKCS_1_EMSA, modulus_bitlen, out, &outlen, &decoded)) != CRYPT_OK) { |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
118 XFREE(out); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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|
119 goto bail_2; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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285
diff
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|
120 } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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|
121 |
0cbe8f6dbf9e
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285
diff
changeset
|
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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285
diff
changeset
|
123 /* construct the SEQUENCE |
0cbe8f6dbf9e
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diff
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|
124 SEQUENCE { |
0cbe8f6dbf9e
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diff
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|
125 SEQUENCE {hashoid OID |
0cbe8f6dbf9e
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diff
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|
126 blah NULL |
0cbe8f6dbf9e
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diff
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|
127 } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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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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diff
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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
changeset
|
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
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
137 XFREE(out); |
0cbe8f6dbf9e
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|
138 goto bail_2; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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|
139 } |
0cbe8f6dbf9e
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|
140 |
0cbe8f6dbf9e
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diff
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|
141 /* test OID */ |
0cbe8f6dbf9e
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diff
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|
142 if ((digestinfo[0].size == hash_descriptor[hash_idx].OIDlen) && |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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|
143 (XMEMCMP(digestinfo[0].data, hash_descriptor[hash_idx].OID, sizeof(unsigned long) * hash_descriptor[hash_idx].OIDlen) == 0) && |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
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|
144 (siginfo[1].size == hashlen) && |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
changeset
|
145 (XMEMCMP(siginfo[1].data, hash, hashlen) == 0)) { |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff
changeset
|
146 *stat = 1; |
0cbe8f6dbf9e
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diff
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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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diff
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|
150 zeromem(out, outlen); |
0cbe8f6dbf9e
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diff
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|
151 #endif |
0cbe8f6dbf9e
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|
152 XFREE(out); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
153 } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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154 |
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155 bail_2: |
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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 /* MRSA */ |
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164 |
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165 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_verify_hash.c,v $ */ |
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166 /* $Revision: 1.11 $ */ |
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167 /* $Date: 2006/12/04 03:09:28 $ */ |