Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/sequence/der_decode_subject_public_key_info.c @ 1471:6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 09 Feb 2018 21:44:05 +0800 |
parents | |
children | e9dba7abd939 |
rev | line source |
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1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 @file der_decode_subject_public_key_info.c |
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12 ASN.1 DER, encode a Subject Public Key structure --nmav |
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13 */ |
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14 |
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15 #ifdef LTC_DER |
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16 |
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17 /* AlgorithmIdentifier := SEQUENCE { |
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18 * algorithm OBJECT IDENTIFIER, |
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19 * parameters ANY DEFINED BY algorithm |
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20 * } |
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21 * |
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22 * SubjectPublicKeyInfo := SEQUENCE { |
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23 * algorithm AlgorithmIdentifier, |
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24 * subjectPublicKey BIT STRING |
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25 * } |
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26 */ |
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27 /** |
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28 Decode a subject public key info |
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29 @param in The input buffer |
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30 @param inlen The length of the input buffer |
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31 @param algorithm One out of the enum #public_key_algorithms |
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32 @param public_key The buffer for the public key |
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33 @param public_key_len [in/out] The length of the public key buffer and the written length |
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34 @param parameters_type The parameters' type out of the enum ltc_asn1_type |
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35 @param parameters The parameters to include |
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36 @param parameters_len The number of parameters to include |
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37 @return CRYPT_OK on success |
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38 */ |
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39 int der_decode_subject_public_key_info(const unsigned char *in, unsigned long inlen, |
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40 unsigned int algorithm, void* public_key, unsigned long* public_key_len, |
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41 unsigned long parameters_type, ltc_asn1_list* parameters, unsigned long parameters_len) |
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42 { |
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43 int err; |
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44 unsigned long len; |
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45 oid_st oid; |
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46 unsigned char *tmpbuf; |
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47 unsigned long tmpoid[16]; |
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48 ltc_asn1_list alg_id[2]; |
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49 ltc_asn1_list subject_pubkey[2]; |
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50 |
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51 LTC_ARGCHK(in != NULL); |
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52 LTC_ARGCHK(inlen != 0); |
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53 LTC_ARGCHK(public_key_len != NULL); |
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54 |
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55 err = pk_get_oid(algorithm, &oid); |
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56 if (err != CRYPT_OK) { |
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57 return err; |
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58 } |
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59 |
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60 /* see if the OpenSSL DER format RSA public key will work */ |
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61 tmpbuf = XCALLOC(1, inlen); |
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62 if (tmpbuf == NULL) { |
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63 err = CRYPT_MEM; |
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64 goto LBL_ERR; |
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65 } |
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66 |
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67 /* this includes the internal hash ID and optional params (NULL in this case) */ |
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68 LTC_SET_ASN1(alg_id, 0, LTC_ASN1_OBJECT_IDENTIFIER, tmpoid, sizeof(tmpoid)/sizeof(tmpoid[0])); |
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69 LTC_SET_ASN1(alg_id, 1, (ltc_asn1_type)parameters_type, parameters, parameters_len); |
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70 |
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71 /* the actual format of the SSL DER key is odd, it stores a RSAPublicKey |
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72 * in a **BIT** string ... so we have to extract it then proceed to convert bit to octet |
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73 */ |
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74 LTC_SET_ASN1(subject_pubkey, 0, LTC_ASN1_SEQUENCE, alg_id, 2); |
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75 LTC_SET_ASN1(subject_pubkey, 1, LTC_ASN1_RAW_BIT_STRING, tmpbuf, inlen*8U); |
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76 |
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77 err=der_decode_sequence(in, inlen, subject_pubkey, 2UL); |
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78 if (err != CRYPT_OK) { |
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79 goto LBL_ERR; |
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80 } |
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81 |
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82 if ((alg_id[0].size != oid.OIDlen) || |
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83 XMEMCMP(oid.OID, alg_id[0].data, oid.OIDlen * sizeof(oid.OID[0]))) { |
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84 /* OID mismatch */ |
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85 err = CRYPT_PK_INVALID_TYPE; |
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86 goto LBL_ERR; |
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87 } |
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88 |
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89 len = subject_pubkey[1].size/8; |
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90 if (*public_key_len > len) { |
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91 XMEMCPY(public_key, subject_pubkey[1].data, len); |
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92 *public_key_len = len; |
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93 } else { |
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94 *public_key_len = len; |
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95 err = CRYPT_BUFFER_OVERFLOW; |
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96 goto LBL_ERR; |
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97 } |
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98 |
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99 err = CRYPT_OK; |
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100 |
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101 LBL_ERR: |
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102 |
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103 XFREE(tmpbuf); |
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104 |
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105 return err; |
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106 } |
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107 |
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108 #endif |
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109 |
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110 /* ref: $Format:%D$ */ |
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111 /* git commit: $Format:%H$ */ |
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112 /* commit time: $Format:%ai$ */ |