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annotate libtomcrypt/src/pk/asn1/der/sequence/der_decode_subject_public_key_info.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents
children e9dba7abd939
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */