1 | /*
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2 | * Public Key layer for writing key files and structures
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3 | *
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4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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5 | * SPDX-License-Identifier: Apache-2.0
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6 | *
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7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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8 | * not use this file except in compliance with the License.
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9 | * You may obtain a copy of the License at
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10 | *
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11 | * http://www.apache.org/licenses/LICENSE-2.0
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12 | *
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13 | * Unless required by applicable law or agreed to in writing, software
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14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 | * See the License for the specific language governing permissions and
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17 | * limitations under the License.
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18 | *
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19 | * This file is part of mbed TLS (https://tls.mbed.org)
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20 | */
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21 |
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22 | #if !defined(MBEDTLS_CONFIG_FILE)
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23 | #include "mbedtls/config.h"
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24 | #else
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25 | #include MBEDTLS_CONFIG_FILE
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26 | #endif
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27 |
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28 | #if defined(MBEDTLS_PK_WRITE_C)
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29 |
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30 | #include "mbedtls/pk.h"
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31 | #include "mbedtls/asn1write.h"
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32 | #include "mbedtls/oid.h"
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33 | #include "mbedtls/platform_util.h"
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34 |
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35 | #include <string.h>
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36 |
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37 | #if defined(MBEDTLS_RSA_C)
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38 | #include "mbedtls/rsa.h"
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39 | #endif
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40 | #if defined(MBEDTLS_ECP_C)
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41 | #include "mbedtls/ecp.h"
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42 | #endif
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43 | #if defined(MBEDTLS_ECDSA_C)
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44 | #include "mbedtls/ecdsa.h"
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45 | #endif
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46 | #if defined(MBEDTLS_PEM_WRITE_C)
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47 | #include "mbedtls/pem.h"
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48 | #endif
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49 |
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50 | #if defined(MBEDTLS_PLATFORM_C)
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51 | #include "mbedtls/platform.h"
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52 | #else
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53 | #include <stdlib.h>
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54 | #define mbedtls_calloc calloc
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55 | #define mbedtls_free free
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56 | #endif
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57 |
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58 | /* Parameter validation macros based on platform_util.h */
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59 | #define PK_VALIDATE_RET( cond ) \
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60 | MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA )
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61 | #define PK_VALIDATE( cond ) \
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62 | MBEDTLS_INTERNAL_VALIDATE( cond )
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63 |
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64 | #if defined(MBEDTLS_RSA_C)
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65 | /*
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66 | * RSAPublicKey ::= SEQUENCE {
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67 | * modulus INTEGER, -- n
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68 | * publicExponent INTEGER -- e
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69 | * }
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70 | */
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71 | static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
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72 | mbedtls_rsa_context *rsa )
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73 | {
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74 | int ret;
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75 | size_t len = 0;
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76 | mbedtls_mpi T;
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77 |
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78 | mbedtls_mpi_init( &T );
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79 |
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80 | /* Export E */
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81 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &T ) ) != 0 ||
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82 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
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83 | goto end_of_export;
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84 | len += ret;
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85 |
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86 | /* Export N */
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87 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, NULL, NULL, NULL ) ) != 0 ||
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88 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
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89 | goto end_of_export;
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90 | len += ret;
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91 |
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92 | end_of_export:
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93 |
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94 | mbedtls_mpi_free( &T );
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95 | if( ret < 0 )
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96 | return( ret );
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97 |
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98 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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99 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
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100 | MBEDTLS_ASN1_SEQUENCE ) );
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101 |
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102 | return( (int) len );
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103 | }
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104 | #endif /* MBEDTLS_RSA_C */
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105 |
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106 | #if defined(MBEDTLS_ECP_C)
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107 | /*
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108 | * EC public key is an EC point
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109 | */
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110 | static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
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111 | mbedtls_ecp_keypair *ec )
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112 | {
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113 | int ret;
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114 | size_t len = 0;
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115 | unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
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116 |
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117 | if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
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118 | MBEDTLS_ECP_PF_UNCOMPRESSED,
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119 | &len, buf, sizeof( buf ) ) ) != 0 )
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120 | {
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121 | return( ret );
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122 | }
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123 |
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124 | if( *p < start || (size_t)( *p - start ) < len )
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125 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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126 |
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127 | *p -= len;
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128 | memcpy( *p, buf, len );
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129 |
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130 | return( (int) len );
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131 | }
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132 |
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133 | /*
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134 | * ECParameters ::= CHOICE {
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135 | * namedCurve OBJECT IDENTIFIER
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136 | * }
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137 | */
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138 | static int pk_write_ec_param( unsigned char **p, unsigned char *start,
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139 | mbedtls_ecp_keypair *ec )
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140 | {
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141 | int ret;
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142 | size_t len = 0;
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143 | const char *oid;
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144 | size_t oid_len;
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145 |
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146 | if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
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147 | return( ret );
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148 |
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149 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
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150 |
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151 | return( (int) len );
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152 | }
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153 | #endif /* MBEDTLS_ECP_C */
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154 |
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155 | int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
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156 | const mbedtls_pk_context *key )
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157 | {
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158 | int ret;
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159 | size_t len = 0;
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160 |
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161 | PK_VALIDATE_RET( p != NULL );
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162 | PK_VALIDATE_RET( *p != NULL );
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163 | PK_VALIDATE_RET( start != NULL );
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164 | PK_VALIDATE_RET( key != NULL );
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165 |
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166 | #if defined(MBEDTLS_RSA_C)
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167 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
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168 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
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169 | else
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170 | #endif
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171 | #if defined(MBEDTLS_ECP_C)
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172 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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173 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
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174 | else
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175 | #endif
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176 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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177 |
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178 | return( (int) len );
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179 | }
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180 |
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181 | int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
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182 | {
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183 | int ret;
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184 | unsigned char *c;
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185 | size_t len = 0, par_len = 0, oid_len;
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186 | const char *oid;
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187 |
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188 | PK_VALIDATE_RET( key != NULL );
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189 | if( size == 0 )
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190 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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191 | PK_VALIDATE_RET( buf != NULL );
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192 |
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193 | c = buf + size;
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194 |
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195 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
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196 |
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197 | if( c - buf < 1 )
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198 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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199 |
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200 | /*
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201 | * SubjectPublicKeyInfo ::= SEQUENCE {
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202 | * algorithm AlgorithmIdentifier,
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203 | * subjectPublicKey BIT STRING }
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204 | */
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205 | *--c = 0;
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206 | len += 1;
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207 |
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208 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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209 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
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210 |
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211 | if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
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212 | &oid, &oid_len ) ) != 0 )
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213 | {
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214 | return( ret );
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215 | }
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216 |
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217 | #if defined(MBEDTLS_ECP_C)
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218 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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219 | {
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220 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
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221 | }
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222 | #endif
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223 |
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224 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
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225 | par_len ) );
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226 |
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227 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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228 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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229 | MBEDTLS_ASN1_SEQUENCE ) );
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230 |
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231 | return( (int) len );
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232 | }
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233 |
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234 | int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
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235 | {
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236 | int ret;
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237 | unsigned char *c;
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238 | size_t len = 0;
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239 |
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240 | PK_VALIDATE_RET( key != NULL );
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241 | if( size == 0 )
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242 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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243 | PK_VALIDATE_RET( buf != NULL );
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244 |
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245 | c = buf + size;
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246 |
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247 | #if defined(MBEDTLS_RSA_C)
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248 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
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249 | {
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250 | mbedtls_mpi T; /* Temporary holding the exported parameters */
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251 | mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
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252 |
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253 | /*
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254 | * Export the parameters one after another to avoid simultaneous copies.
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255 | */
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256 |
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257 | mbedtls_mpi_init( &T );
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258 |
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259 | /* Export QP */
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260 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, NULL, &T ) ) != 0 ||
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261 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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262 | goto end_of_export;
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263 | len += ret;
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264 |
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265 | /* Export DQ */
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266 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, &T, NULL ) ) != 0 ||
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267 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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268 | goto end_of_export;
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269 | len += ret;
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270 |
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271 | /* Export DP */
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272 | if( ( ret = mbedtls_rsa_export_crt( rsa, &T, NULL, NULL ) ) != 0 ||
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273 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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274 | goto end_of_export;
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275 | len += ret;
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276 |
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277 | /* Export Q */
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278 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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279 | &T, NULL, NULL ) ) != 0 ||
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280 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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281 | goto end_of_export;
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282 | len += ret;
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283 |
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284 | /* Export P */
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285 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, &T,
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286 | NULL, NULL, NULL ) ) != 0 ||
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287 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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288 | goto end_of_export;
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289 | len += ret;
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290 |
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291 | /* Export D */
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292 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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293 | NULL, &T, NULL ) ) != 0 ||
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294 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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295 | goto end_of_export;
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296 | len += ret;
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297 |
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298 | /* Export E */
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299 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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300 | NULL, NULL, &T ) ) != 0 ||
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301 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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302 | goto end_of_export;
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303 | len += ret;
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304 |
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305 | /* Export N */
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306 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL,
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307 | NULL, NULL, NULL ) ) != 0 ||
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308 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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309 | goto end_of_export;
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310 | len += ret;
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311 |
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312 | end_of_export:
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313 |
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314 | mbedtls_mpi_free( &T );
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315 | if( ret < 0 )
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316 | return( ret );
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317 |
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318 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
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319 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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320 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c,
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321 | buf, MBEDTLS_ASN1_CONSTRUCTED |
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322 | MBEDTLS_ASN1_SEQUENCE ) );
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323 | }
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324 | else
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325 | #endif /* MBEDTLS_RSA_C */
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326 | #if defined(MBEDTLS_ECP_C)
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327 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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328 | {
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329 | mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
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330 | size_t pub_len = 0, par_len = 0;
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331 |
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332 | /*
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333 | * RFC 5915, or SEC1 Appendix C.4
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334 | *
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335 | * ECPrivateKey ::= SEQUENCE {
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336 | * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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337 | * privateKey OCTET STRING,
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338 | * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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339 | * publicKey [1] BIT STRING OPTIONAL
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340 | * }
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341 | */
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342 |
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343 | /* publicKey */
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344 | MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
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345 |
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346 | if( c - buf < 1 )
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347 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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348 | *--c = 0;
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349 | pub_len += 1;
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350 |
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351 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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352 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
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353 |
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354 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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355 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
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356 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
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357 | len += pub_len;
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358 |
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359 | /* parameters */
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360 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
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361 |
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362 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
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363 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
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364 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
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365 | len += par_len;
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366 |
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367 | /* privateKey: write as MPI then fix tag */
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368 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
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369 | *c = MBEDTLS_ASN1_OCTET_STRING;
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370 |
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371 | /* version */
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372 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
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373 |
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374 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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375 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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376 | MBEDTLS_ASN1_SEQUENCE ) );
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377 | }
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378 | else
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379 | #endif /* MBEDTLS_ECP_C */
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380 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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381 |
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382 | return( (int) len );
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383 | }
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384 |
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385 | #if defined(MBEDTLS_PEM_WRITE_C)
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386 |
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387 | #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
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388 | #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
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389 |
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390 | #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
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391 | #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
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392 | #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
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393 | #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
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394 |
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395 | /*
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396 | * Max sizes of key per types. Shown as tag + len (+ content).
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397 | */
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398 |
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399 | #if defined(MBEDTLS_RSA_C)
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400 | /*
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401 | * RSA public keys:
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402 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
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403 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
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404 | * + 1 + 1 + 9 (rsa oid)
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405 | * + 1 + 1 (params null)
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406 | * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
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407 | * RSAPublicKey ::= SEQUENCE { 1 + 3
|
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408 | * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
|
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409 | * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
|
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410 | * }
|
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411 | */
|
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412 | #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
|
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413 |
|
---|
414 | /*
|
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415 | * RSA private keys:
|
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416 | * RSAPrivateKey ::= SEQUENCE { 1 + 3
|
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417 | * version Version, 1 + 1 + 1
|
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418 | * modulus INTEGER, 1 + 3 + MPI_MAX + 1
|
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419 | * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
|
---|
420 | * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
|
---|
421 | * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
---|
422 | * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
---|
423 | * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
---|
424 | * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
---|
425 | * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
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426 | * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
|
---|
427 | * }
|
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428 | */
|
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429 | #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
|
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430 | MBEDTLS_MPI_MAX_SIZE % 2
|
---|
431 | #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
|
---|
432 | + 5 * MPI_MAX_SIZE_2
|
---|
433 |
|
---|
434 | #else /* MBEDTLS_RSA_C */
|
---|
435 |
|
---|
436 | #define RSA_PUB_DER_MAX_BYTES 0
|
---|
437 | #define RSA_PRV_DER_MAX_BYTES 0
|
---|
438 |
|
---|
439 | #endif /* MBEDTLS_RSA_C */
|
---|
440 |
|
---|
441 | #if defined(MBEDTLS_ECP_C)
|
---|
442 | /*
|
---|
443 | * EC public keys:
|
---|
444 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
|
---|
445 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
|
---|
446 | * + 1 + 1 + 7 (ec oid)
|
---|
447 | * + 1 + 1 + 9 (namedCurve oid)
|
---|
448 | * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
|
---|
449 | * + 1 (point format) [1]
|
---|
450 | * + 2 * ECP_MAX (coords) [1]
|
---|
451 | * }
|
---|
452 | */
|
---|
453 | #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
|
---|
454 |
|
---|
455 | /*
|
---|
456 | * EC private keys:
|
---|
457 | * ECPrivateKey ::= SEQUENCE { 1 + 2
|
---|
458 | * version INTEGER , 1 + 1 + 1
|
---|
459 | * privateKey OCTET STRING, 1 + 1 + ECP_MAX
|
---|
460 | * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
|
---|
461 | * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
|
---|
462 | * }
|
---|
463 | */
|
---|
464 | #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
|
---|
465 |
|
---|
466 | #else /* MBEDTLS_ECP_C */
|
---|
467 |
|
---|
468 | #define ECP_PUB_DER_MAX_BYTES 0
|
---|
469 | #define ECP_PRV_DER_MAX_BYTES 0
|
---|
470 |
|
---|
471 | #endif /* MBEDTLS_ECP_C */
|
---|
472 |
|
---|
473 | #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
|
---|
474 | RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
|
---|
475 | #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
|
---|
476 | RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
|
---|
477 |
|
---|
478 | int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
|
---|
479 | {
|
---|
480 | int ret;
|
---|
481 | unsigned char output_buf[PUB_DER_MAX_BYTES];
|
---|
482 | size_t olen = 0;
|
---|
483 |
|
---|
484 | PK_VALIDATE_RET( key != NULL );
|
---|
485 | PK_VALIDATE_RET( buf != NULL || size == 0 );
|
---|
486 |
|
---|
487 | if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
|
---|
488 | sizeof(output_buf) ) ) < 0 )
|
---|
489 | {
|
---|
490 | return( ret );
|
---|
491 | }
|
---|
492 |
|
---|
493 | if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
|
---|
494 | output_buf + sizeof(output_buf) - ret,
|
---|
495 | ret, buf, size, &olen ) ) != 0 )
|
---|
496 | {
|
---|
497 | return( ret );
|
---|
498 | }
|
---|
499 |
|
---|
500 | return( 0 );
|
---|
501 | }
|
---|
502 |
|
---|
503 | int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
|
---|
504 | {
|
---|
505 | int ret;
|
---|
506 | unsigned char output_buf[PRV_DER_MAX_BYTES];
|
---|
507 | const char *begin, *end;
|
---|
508 | size_t olen = 0;
|
---|
509 |
|
---|
510 | PK_VALIDATE_RET( key != NULL );
|
---|
511 | PK_VALIDATE_RET( buf != NULL || size == 0 );
|
---|
512 |
|
---|
513 | if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
|
---|
514 | return( ret );
|
---|
515 |
|
---|
516 | #if defined(MBEDTLS_RSA_C)
|
---|
517 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
|
---|
518 | {
|
---|
519 | begin = PEM_BEGIN_PRIVATE_KEY_RSA;
|
---|
520 | end = PEM_END_PRIVATE_KEY_RSA;
|
---|
521 | }
|
---|
522 | else
|
---|
523 | #endif
|
---|
524 | #if defined(MBEDTLS_ECP_C)
|
---|
525 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
|
---|
526 | {
|
---|
527 | begin = PEM_BEGIN_PRIVATE_KEY_EC;
|
---|
528 | end = PEM_END_PRIVATE_KEY_EC;
|
---|
529 | }
|
---|
530 | else
|
---|
531 | #endif
|
---|
532 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
---|
533 |
|
---|
534 | if( ( ret = mbedtls_pem_write_buffer( begin, end,
|
---|
535 | output_buf + sizeof(output_buf) - ret,
|
---|
536 | ret, buf, size, &olen ) ) != 0 )
|
---|
537 | {
|
---|
538 | return( ret );
|
---|
539 | }
|
---|
540 |
|
---|
541 | return( 0 );
|
---|
542 | }
|
---|
543 | #endif /* MBEDTLS_PEM_WRITE_C */
|
---|
544 |
|
---|
545 | #endif /* MBEDTLS_PK_WRITE_C */
|
---|