Simon Cooksey / mbed-os

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features/mbedtls/src/pkwrite.c@0:fb7af294d5d9, 2016-11-17 (annotated)

Committer:
Simon Cooksey
Date:
Thu Nov 17 16:43:53 2016 +0000
Revision:
0:fb7af294d5d9
Initial commit

Who changed what in which revision?

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Simon Cooksey 0:fb7af294d5d9 1 /*
Simon Cooksey 0:fb7af294d5d9 2 * Public Key layer for writing key files and structures
Simon Cooksey 0:fb7af294d5d9 3 *
Simon Cooksey 0:fb7af294d5d9 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Simon Cooksey 0:fb7af294d5d9 5 * SPDX-License-Identifier: Apache-2.0
Simon Cooksey 0:fb7af294d5d9 6 *
Simon Cooksey 0:fb7af294d5d9 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
Simon Cooksey 0:fb7af294d5d9 8 * not use this file except in compliance with the License.
Simon Cooksey 0:fb7af294d5d9 9 * You may obtain a copy of the License at
Simon Cooksey 0:fb7af294d5d9 10 *
Simon Cooksey 0:fb7af294d5d9 11 * http://www.apache.org/licenses/LICENSE-2.0
Simon Cooksey 0:fb7af294d5d9 12 *
Simon Cooksey 0:fb7af294d5d9 13 * Unless required by applicable law or agreed to in writing, software
Simon Cooksey 0:fb7af294d5d9 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
Simon Cooksey 0:fb7af294d5d9 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Simon Cooksey 0:fb7af294d5d9 16 * See the License for the specific language governing permissions and
Simon Cooksey 0:fb7af294d5d9 17 * limitations under the License.
Simon Cooksey 0:fb7af294d5d9 18 *
Simon Cooksey 0:fb7af294d5d9 19 * This file is part of mbed TLS (https://tls.mbed.org)
Simon Cooksey 0:fb7af294d5d9 20 */
Simon Cooksey 0:fb7af294d5d9 21
Simon Cooksey 0:fb7af294d5d9 22 #if !defined(MBEDTLS_CONFIG_FILE)
Simon Cooksey 0:fb7af294d5d9 23 #include "mbedtls/config.h"
Simon Cooksey 0:fb7af294d5d9 24 #else
Simon Cooksey 0:fb7af294d5d9 25 #include MBEDTLS_CONFIG_FILE
Simon Cooksey 0:fb7af294d5d9 26 #endif
Simon Cooksey 0:fb7af294d5d9 27
Simon Cooksey 0:fb7af294d5d9 28 #if defined(MBEDTLS_PK_WRITE_C)
Simon Cooksey 0:fb7af294d5d9 29
Simon Cooksey 0:fb7af294d5d9 30 #include "mbedtls/pk.h"
Simon Cooksey 0:fb7af294d5d9 31 #include "mbedtls/asn1write.h"
Simon Cooksey 0:fb7af294d5d9 32 #include "mbedtls/oid.h"
Simon Cooksey 0:fb7af294d5d9 33
Simon Cooksey 0:fb7af294d5d9 34 #include <string.h>
Simon Cooksey 0:fb7af294d5d9 35
Simon Cooksey 0:fb7af294d5d9 36 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 37 #include "mbedtls/rsa.h"
Simon Cooksey 0:fb7af294d5d9 38 #endif
Simon Cooksey 0:fb7af294d5d9 39 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 40 #include "mbedtls/ecp.h"
Simon Cooksey 0:fb7af294d5d9 41 #endif
Simon Cooksey 0:fb7af294d5d9 42 #if defined(MBEDTLS_ECDSA_C)
Simon Cooksey 0:fb7af294d5d9 43 #include "mbedtls/ecdsa.h"
Simon Cooksey 0:fb7af294d5d9 44 #endif
Simon Cooksey 0:fb7af294d5d9 45 #if defined(MBEDTLS_PEM_WRITE_C)
Simon Cooksey 0:fb7af294d5d9 46 #include "mbedtls/pem.h"
Simon Cooksey 0:fb7af294d5d9 47 #endif
Simon Cooksey 0:fb7af294d5d9 48
Simon Cooksey 0:fb7af294d5d9 49 #if defined(MBEDTLS_PLATFORM_C)
Simon Cooksey 0:fb7af294d5d9 50 #include "mbedtls/platform.h"
Simon Cooksey 0:fb7af294d5d9 51 #else
Simon Cooksey 0:fb7af294d5d9 52 #include <stdlib.h>
Simon Cooksey 0:fb7af294d5d9 53 #define mbedtls_calloc calloc
Simon Cooksey 0:fb7af294d5d9 54 #define mbedtls_free free
Simon Cooksey 0:fb7af294d5d9 55 #endif
Simon Cooksey 0:fb7af294d5d9 56
Simon Cooksey 0:fb7af294d5d9 57 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 58 /*
Simon Cooksey 0:fb7af294d5d9 59 * RSAPublicKey ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 60 * modulus INTEGER, -- n
Simon Cooksey 0:fb7af294d5d9 61 * publicExponent INTEGER -- e
Simon Cooksey 0:fb7af294d5d9 62 * }
Simon Cooksey 0:fb7af294d5d9 63 */
Simon Cooksey 0:fb7af294d5d9 64 static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
Simon Cooksey 0:fb7af294d5d9 65 mbedtls_rsa_context *rsa )
Simon Cooksey 0:fb7af294d5d9 66 {
Simon Cooksey 0:fb7af294d5d9 67 int ret;
Simon Cooksey 0:fb7af294d5d9 68 size_t len = 0;
Simon Cooksey 0:fb7af294d5d9 69
Simon Cooksey 0:fb7af294d5d9 70 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->E ) );
Simon Cooksey 0:fb7af294d5d9 71 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->N ) );
Simon Cooksey 0:fb7af294d5d9 72
Simon Cooksey 0:fb7af294d5d9 73 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
Simon Cooksey 0:fb7af294d5d9 74 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
Simon Cooksey 0:fb7af294d5d9 75 MBEDTLS_ASN1_SEQUENCE ) );
Simon Cooksey 0:fb7af294d5d9 76
Simon Cooksey 0:fb7af294d5d9 77 return( (int) len );
Simon Cooksey 0:fb7af294d5d9 78 }
Simon Cooksey 0:fb7af294d5d9 79 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 80
Simon Cooksey 0:fb7af294d5d9 81 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 82 /*
Simon Cooksey 0:fb7af294d5d9 83 * EC public key is an EC point
Simon Cooksey 0:fb7af294d5d9 84 */
Simon Cooksey 0:fb7af294d5d9 85 static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
Simon Cooksey 0:fb7af294d5d9 86 mbedtls_ecp_keypair *ec )
Simon Cooksey 0:fb7af294d5d9 87 {
Simon Cooksey 0:fb7af294d5d9 88 int ret;
Simon Cooksey 0:fb7af294d5d9 89 size_t len = 0;
Simon Cooksey 0:fb7af294d5d9 90 unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
Simon Cooksey 0:fb7af294d5d9 91
Simon Cooksey 0:fb7af294d5d9 92 if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
Simon Cooksey 0:fb7af294d5d9 93 MBEDTLS_ECP_PF_UNCOMPRESSED,
Simon Cooksey 0:fb7af294d5d9 94 &len, buf, sizeof( buf ) ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 95 {
Simon Cooksey 0:fb7af294d5d9 96 return( ret );
Simon Cooksey 0:fb7af294d5d9 97 }
Simon Cooksey 0:fb7af294d5d9 98
Simon Cooksey 0:fb7af294d5d9 99 if( *p < start || (size_t)( *p - start ) < len )
Simon Cooksey 0:fb7af294d5d9 100 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
Simon Cooksey 0:fb7af294d5d9 101
Simon Cooksey 0:fb7af294d5d9 102 *p -= len;
Simon Cooksey 0:fb7af294d5d9 103 memcpy( *p, buf, len );
Simon Cooksey 0:fb7af294d5d9 104
Simon Cooksey 0:fb7af294d5d9 105 return( (int) len );
Simon Cooksey 0:fb7af294d5d9 106 }
Simon Cooksey 0:fb7af294d5d9 107
Simon Cooksey 0:fb7af294d5d9 108 /*
Simon Cooksey 0:fb7af294d5d9 109 * ECParameters ::= CHOICE {
Simon Cooksey 0:fb7af294d5d9 110 * namedCurve OBJECT IDENTIFIER
Simon Cooksey 0:fb7af294d5d9 111 * }
Simon Cooksey 0:fb7af294d5d9 112 */
Simon Cooksey 0:fb7af294d5d9 113 static int pk_write_ec_param( unsigned char **p, unsigned char *start,
Simon Cooksey 0:fb7af294d5d9 114 mbedtls_ecp_keypair *ec )
Simon Cooksey 0:fb7af294d5d9 115 {
Simon Cooksey 0:fb7af294d5d9 116 int ret;
Simon Cooksey 0:fb7af294d5d9 117 size_t len = 0;
Simon Cooksey 0:fb7af294d5d9 118 const char *oid;
Simon Cooksey 0:fb7af294d5d9 119 size_t oid_len;
Simon Cooksey 0:fb7af294d5d9 120
Simon Cooksey 0:fb7af294d5d9 121 if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 122 return( ret );
Simon Cooksey 0:fb7af294d5d9 123
Simon Cooksey 0:fb7af294d5d9 124 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
Simon Cooksey 0:fb7af294d5d9 125
Simon Cooksey 0:fb7af294d5d9 126 return( (int) len );
Simon Cooksey 0:fb7af294d5d9 127 }
Simon Cooksey 0:fb7af294d5d9 128 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 129
Simon Cooksey 0:fb7af294d5d9 130 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
Simon Cooksey 0:fb7af294d5d9 131 const mbedtls_pk_context *key )
Simon Cooksey 0:fb7af294d5d9 132 {
Simon Cooksey 0:fb7af294d5d9 133 int ret;
Simon Cooksey 0:fb7af294d5d9 134 size_t len = 0;
Simon Cooksey 0:fb7af294d5d9 135
Simon Cooksey 0:fb7af294d5d9 136 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 137 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
Simon Cooksey 0:fb7af294d5d9 138 MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
Simon Cooksey 0:fb7af294d5d9 139 else
Simon Cooksey 0:fb7af294d5d9 140 #endif
Simon Cooksey 0:fb7af294d5d9 141 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 142 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
Simon Cooksey 0:fb7af294d5d9 143 MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
Simon Cooksey 0:fb7af294d5d9 144 else
Simon Cooksey 0:fb7af294d5d9 145 #endif
Simon Cooksey 0:fb7af294d5d9 146 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
Simon Cooksey 0:fb7af294d5d9 147
Simon Cooksey 0:fb7af294d5d9 148 return( (int) len );
Simon Cooksey 0:fb7af294d5d9 149 }
Simon Cooksey 0:fb7af294d5d9 150
Simon Cooksey 0:fb7af294d5d9 151 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
Simon Cooksey 0:fb7af294d5d9 152 {
Simon Cooksey 0:fb7af294d5d9 153 int ret;
Simon Cooksey 0:fb7af294d5d9 154 unsigned char *c;
Simon Cooksey 0:fb7af294d5d9 155 size_t len = 0, par_len = 0, oid_len;
Simon Cooksey 0:fb7af294d5d9 156 const char *oid;
Simon Cooksey 0:fb7af294d5d9 157
Simon Cooksey 0:fb7af294d5d9 158 c = buf + size;
Simon Cooksey 0:fb7af294d5d9 159
Simon Cooksey 0:fb7af294d5d9 160 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
Simon Cooksey 0:fb7af294d5d9 161
Simon Cooksey 0:fb7af294d5d9 162 if( c - buf < 1 )
Simon Cooksey 0:fb7af294d5d9 163 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
Simon Cooksey 0:fb7af294d5d9 164
Simon Cooksey 0:fb7af294d5d9 165 /*
Simon Cooksey 0:fb7af294d5d9 166 * SubjectPublicKeyInfo ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 167 * algorithm AlgorithmIdentifier,
Simon Cooksey 0:fb7af294d5d9 168 * subjectPublicKey BIT STRING }
Simon Cooksey 0:fb7af294d5d9 169 */
Simon Cooksey 0:fb7af294d5d9 170 *--c = 0;
Simon Cooksey 0:fb7af294d5d9 171 len += 1;
Simon Cooksey 0:fb7af294d5d9 172
Simon Cooksey 0:fb7af294d5d9 173 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
Simon Cooksey 0:fb7af294d5d9 174 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
Simon Cooksey 0:fb7af294d5d9 175
Simon Cooksey 0:fb7af294d5d9 176 if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
Simon Cooksey 0:fb7af294d5d9 177 &oid, &oid_len ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 178 {
Simon Cooksey 0:fb7af294d5d9 179 return( ret );
Simon Cooksey 0:fb7af294d5d9 180 }
Simon Cooksey 0:fb7af294d5d9 181
Simon Cooksey 0:fb7af294d5d9 182 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 183 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
Simon Cooksey 0:fb7af294d5d9 184 {
Simon Cooksey 0:fb7af294d5d9 185 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
Simon Cooksey 0:fb7af294d5d9 186 }
Simon Cooksey 0:fb7af294d5d9 187 #endif
Simon Cooksey 0:fb7af294d5d9 188
Simon Cooksey 0:fb7af294d5d9 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
Simon Cooksey 0:fb7af294d5d9 190 par_len ) );
Simon Cooksey 0:fb7af294d5d9 191
Simon Cooksey 0:fb7af294d5d9 192 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
Simon Cooksey 0:fb7af294d5d9 193 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
Simon Cooksey 0:fb7af294d5d9 194 MBEDTLS_ASN1_SEQUENCE ) );
Simon Cooksey 0:fb7af294d5d9 195
Simon Cooksey 0:fb7af294d5d9 196 return( (int) len );
Simon Cooksey 0:fb7af294d5d9 197 }
Simon Cooksey 0:fb7af294d5d9 198
Simon Cooksey 0:fb7af294d5d9 199 int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
Simon Cooksey 0:fb7af294d5d9 200 {
Simon Cooksey 0:fb7af294d5d9 201 int ret;
Simon Cooksey 0:fb7af294d5d9 202 unsigned char *c = buf + size;
Simon Cooksey 0:fb7af294d5d9 203 size_t len = 0;
Simon Cooksey 0:fb7af294d5d9 204
Simon Cooksey 0:fb7af294d5d9 205 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 206 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
Simon Cooksey 0:fb7af294d5d9 207 {
Simon Cooksey 0:fb7af294d5d9 208 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
Simon Cooksey 0:fb7af294d5d9 209
Simon Cooksey 0:fb7af294d5d9 210 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->QP ) );
Simon Cooksey 0:fb7af294d5d9 211 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DQ ) );
Simon Cooksey 0:fb7af294d5d9 212 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DP ) );
Simon Cooksey 0:fb7af294d5d9 213 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->Q ) );
Simon Cooksey 0:fb7af294d5d9 214 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->P ) );
Simon Cooksey 0:fb7af294d5d9 215 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->D ) );
Simon Cooksey 0:fb7af294d5d9 216 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->E ) );
Simon Cooksey 0:fb7af294d5d9 217 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->N ) );
Simon Cooksey 0:fb7af294d5d9 218 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
Simon Cooksey 0:fb7af294d5d9 219
Simon Cooksey 0:fb7af294d5d9 220 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
Simon Cooksey 0:fb7af294d5d9 221 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
Simon Cooksey 0:fb7af294d5d9 222 MBEDTLS_ASN1_SEQUENCE ) );
Simon Cooksey 0:fb7af294d5d9 223 }
Simon Cooksey 0:fb7af294d5d9 224 else
Simon Cooksey 0:fb7af294d5d9 225 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 226 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 227 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
Simon Cooksey 0:fb7af294d5d9 228 {
Simon Cooksey 0:fb7af294d5d9 229 mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
Simon Cooksey 0:fb7af294d5d9 230 size_t pub_len = 0, par_len = 0;
Simon Cooksey 0:fb7af294d5d9 231
Simon Cooksey 0:fb7af294d5d9 232 /*
Simon Cooksey 0:fb7af294d5d9 233 * RFC 5915, or SEC1 Appendix C.4
Simon Cooksey 0:fb7af294d5d9 234 *
Simon Cooksey 0:fb7af294d5d9 235 * ECPrivateKey ::= SEQUENCE {
Simon Cooksey 0:fb7af294d5d9 236 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
Simon Cooksey 0:fb7af294d5d9 237 * privateKey OCTET STRING,
Simon Cooksey 0:fb7af294d5d9 238 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
Simon Cooksey 0:fb7af294d5d9 239 * publicKey [1] BIT STRING OPTIONAL
Simon Cooksey 0:fb7af294d5d9 240 * }
Simon Cooksey 0:fb7af294d5d9 241 */
Simon Cooksey 0:fb7af294d5d9 242
Simon Cooksey 0:fb7af294d5d9 243 /* publicKey */
Simon Cooksey 0:fb7af294d5d9 244 MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
Simon Cooksey 0:fb7af294d5d9 245
Simon Cooksey 0:fb7af294d5d9 246 if( c - buf < 1 )
Simon Cooksey 0:fb7af294d5d9 247 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
Simon Cooksey 0:fb7af294d5d9 248 *--c = 0;
Simon Cooksey 0:fb7af294d5d9 249 pub_len += 1;
Simon Cooksey 0:fb7af294d5d9 250
Simon Cooksey 0:fb7af294d5d9 251 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
Simon Cooksey 0:fb7af294d5d9 252 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
Simon Cooksey 0:fb7af294d5d9 253
Simon Cooksey 0:fb7af294d5d9 254 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
Simon Cooksey 0:fb7af294d5d9 255 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
Simon Cooksey 0:fb7af294d5d9 256 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
Simon Cooksey 0:fb7af294d5d9 257 len += pub_len;
Simon Cooksey 0:fb7af294d5d9 258
Simon Cooksey 0:fb7af294d5d9 259 /* parameters */
Simon Cooksey 0:fb7af294d5d9 260 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
Simon Cooksey 0:fb7af294d5d9 261
Simon Cooksey 0:fb7af294d5d9 262 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
Simon Cooksey 0:fb7af294d5d9 263 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
Simon Cooksey 0:fb7af294d5d9 264 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
Simon Cooksey 0:fb7af294d5d9 265 len += par_len;
Simon Cooksey 0:fb7af294d5d9 266
Simon Cooksey 0:fb7af294d5d9 267 /* privateKey: write as MPI then fix tag */
Simon Cooksey 0:fb7af294d5d9 268 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
Simon Cooksey 0:fb7af294d5d9 269 *c = MBEDTLS_ASN1_OCTET_STRING;
Simon Cooksey 0:fb7af294d5d9 270
Simon Cooksey 0:fb7af294d5d9 271 /* version */
Simon Cooksey 0:fb7af294d5d9 272 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
Simon Cooksey 0:fb7af294d5d9 273
Simon Cooksey 0:fb7af294d5d9 274 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
Simon Cooksey 0:fb7af294d5d9 275 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
Simon Cooksey 0:fb7af294d5d9 276 MBEDTLS_ASN1_SEQUENCE ) );
Simon Cooksey 0:fb7af294d5d9 277 }
Simon Cooksey 0:fb7af294d5d9 278 else
Simon Cooksey 0:fb7af294d5d9 279 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 280 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
Simon Cooksey 0:fb7af294d5d9 281
Simon Cooksey 0:fb7af294d5d9 282 return( (int) len );
Simon Cooksey 0:fb7af294d5d9 283 }
Simon Cooksey 0:fb7af294d5d9 284
Simon Cooksey 0:fb7af294d5d9 285 #if defined(MBEDTLS_PEM_WRITE_C)
Simon Cooksey 0:fb7af294d5d9 286
Simon Cooksey 0:fb7af294d5d9 287 #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
Simon Cooksey 0:fb7af294d5d9 288 #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
Simon Cooksey 0:fb7af294d5d9 289
Simon Cooksey 0:fb7af294d5d9 290 #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
Simon Cooksey 0:fb7af294d5d9 291 #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
Simon Cooksey 0:fb7af294d5d9 292 #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
Simon Cooksey 0:fb7af294d5d9 293 #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
Simon Cooksey 0:fb7af294d5d9 294
Simon Cooksey 0:fb7af294d5d9 295 /*
Simon Cooksey 0:fb7af294d5d9 296 * Max sizes of key per types. Shown as tag + len (+ content).
Simon Cooksey 0:fb7af294d5d9 297 */
Simon Cooksey 0:fb7af294d5d9 298
Simon Cooksey 0:fb7af294d5d9 299 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 300 /*
Simon Cooksey 0:fb7af294d5d9 301 * RSA public keys:
Simon Cooksey 0:fb7af294d5d9 302 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
Simon Cooksey 0:fb7af294d5d9 303 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
Simon Cooksey 0:fb7af294d5d9 304 * + 1 + 1 + 9 (rsa oid)
Simon Cooksey 0:fb7af294d5d9 305 * + 1 + 1 (params null)
Simon Cooksey 0:fb7af294d5d9 306 * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
Simon Cooksey 0:fb7af294d5d9 307 * RSAPublicKey ::= SEQUENCE { 1 + 3
Simon Cooksey 0:fb7af294d5d9 308 * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
Simon Cooksey 0:fb7af294d5d9 309 * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
Simon Cooksey 0:fb7af294d5d9 310 * }
Simon Cooksey 0:fb7af294d5d9 311 */
Simon Cooksey 0:fb7af294d5d9 312 #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
Simon Cooksey 0:fb7af294d5d9 313
Simon Cooksey 0:fb7af294d5d9 314 /*
Simon Cooksey 0:fb7af294d5d9 315 * RSA private keys:
Simon Cooksey 0:fb7af294d5d9 316 * RSAPrivateKey ::= SEQUENCE { 1 + 3
Simon Cooksey 0:fb7af294d5d9 317 * version Version, 1 + 1 + 1
Simon Cooksey 0:fb7af294d5d9 318 * modulus INTEGER, 1 + 3 + MPI_MAX + 1
Simon Cooksey 0:fb7af294d5d9 319 * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
Simon Cooksey 0:fb7af294d5d9 320 * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
Simon Cooksey 0:fb7af294d5d9 321 * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
Simon Cooksey 0:fb7af294d5d9 322 * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
Simon Cooksey 0:fb7af294d5d9 323 * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
Simon Cooksey 0:fb7af294d5d9 324 * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
Simon Cooksey 0:fb7af294d5d9 325 * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
Simon Cooksey 0:fb7af294d5d9 326 * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
Simon Cooksey 0:fb7af294d5d9 327 * }
Simon Cooksey 0:fb7af294d5d9 328 */
Simon Cooksey 0:fb7af294d5d9 329 #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
Simon Cooksey 0:fb7af294d5d9 330 MBEDTLS_MPI_MAX_SIZE % 2
Simon Cooksey 0:fb7af294d5d9 331 #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
Simon Cooksey 0:fb7af294d5d9 332 + 5 * MPI_MAX_SIZE_2
Simon Cooksey 0:fb7af294d5d9 333
Simon Cooksey 0:fb7af294d5d9 334 #else /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 335
Simon Cooksey 0:fb7af294d5d9 336 #define RSA_PUB_DER_MAX_BYTES 0
Simon Cooksey 0:fb7af294d5d9 337 #define RSA_PRV_DER_MAX_BYTES 0
Simon Cooksey 0:fb7af294d5d9 338
Simon Cooksey 0:fb7af294d5d9 339 #endif /* MBEDTLS_RSA_C */
Simon Cooksey 0:fb7af294d5d9 340
Simon Cooksey 0:fb7af294d5d9 341 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 342 /*
Simon Cooksey 0:fb7af294d5d9 343 * EC public keys:
Simon Cooksey 0:fb7af294d5d9 344 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
Simon Cooksey 0:fb7af294d5d9 345 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
Simon Cooksey 0:fb7af294d5d9 346 * + 1 + 1 + 7 (ec oid)
Simon Cooksey 0:fb7af294d5d9 347 * + 1 + 1 + 9 (namedCurve oid)
Simon Cooksey 0:fb7af294d5d9 348 * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
Simon Cooksey 0:fb7af294d5d9 349 * + 1 (point format) [1]
Simon Cooksey 0:fb7af294d5d9 350 * + 2 * ECP_MAX (coords) [1]
Simon Cooksey 0:fb7af294d5d9 351 * }
Simon Cooksey 0:fb7af294d5d9 352 */
Simon Cooksey 0:fb7af294d5d9 353 #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
Simon Cooksey 0:fb7af294d5d9 354
Simon Cooksey 0:fb7af294d5d9 355 /*
Simon Cooksey 0:fb7af294d5d9 356 * EC private keys:
Simon Cooksey 0:fb7af294d5d9 357 * ECPrivateKey ::= SEQUENCE { 1 + 2
Simon Cooksey 0:fb7af294d5d9 358 * version INTEGER , 1 + 1 + 1
Simon Cooksey 0:fb7af294d5d9 359 * privateKey OCTET STRING, 1 + 1 + ECP_MAX
Simon Cooksey 0:fb7af294d5d9 360 * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
Simon Cooksey 0:fb7af294d5d9 361 * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
Simon Cooksey 0:fb7af294d5d9 362 * }
Simon Cooksey 0:fb7af294d5d9 363 */
Simon Cooksey 0:fb7af294d5d9 364 #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
Simon Cooksey 0:fb7af294d5d9 365
Simon Cooksey 0:fb7af294d5d9 366 #else /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 367
Simon Cooksey 0:fb7af294d5d9 368 #define ECP_PUB_DER_MAX_BYTES 0
Simon Cooksey 0:fb7af294d5d9 369 #define ECP_PRV_DER_MAX_BYTES 0
Simon Cooksey 0:fb7af294d5d9 370
Simon Cooksey 0:fb7af294d5d9 371 #endif /* MBEDTLS_ECP_C */
Simon Cooksey 0:fb7af294d5d9 372
Simon Cooksey 0:fb7af294d5d9 373 #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
Simon Cooksey 0:fb7af294d5d9 374 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
Simon Cooksey 0:fb7af294d5d9 375 #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
Simon Cooksey 0:fb7af294d5d9 376 RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
Simon Cooksey 0:fb7af294d5d9 377
Simon Cooksey 0:fb7af294d5d9 378 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
Simon Cooksey 0:fb7af294d5d9 379 {
Simon Cooksey 0:fb7af294d5d9 380 int ret;
Simon Cooksey 0:fb7af294d5d9 381 unsigned char output_buf[PUB_DER_MAX_BYTES];
Simon Cooksey 0:fb7af294d5d9 382 size_t olen = 0;
Simon Cooksey 0:fb7af294d5d9 383
Simon Cooksey 0:fb7af294d5d9 384 if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
Simon Cooksey 0:fb7af294d5d9 385 sizeof(output_buf) ) ) < 0 )
Simon Cooksey 0:fb7af294d5d9 386 {
Simon Cooksey 0:fb7af294d5d9 387 return( ret );
Simon Cooksey 0:fb7af294d5d9 388 }
Simon Cooksey 0:fb7af294d5d9 389
Simon Cooksey 0:fb7af294d5d9 390 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
Simon Cooksey 0:fb7af294d5d9 391 output_buf + sizeof(output_buf) - ret,
Simon Cooksey 0:fb7af294d5d9 392 ret, buf, size, &olen ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 393 {
Simon Cooksey 0:fb7af294d5d9 394 return( ret );
Simon Cooksey 0:fb7af294d5d9 395 }
Simon Cooksey 0:fb7af294d5d9 396
Simon Cooksey 0:fb7af294d5d9 397 return( 0 );
Simon Cooksey 0:fb7af294d5d9 398 }
Simon Cooksey 0:fb7af294d5d9 399
Simon Cooksey 0:fb7af294d5d9 400 int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
Simon Cooksey 0:fb7af294d5d9 401 {
Simon Cooksey 0:fb7af294d5d9 402 int ret;
Simon Cooksey 0:fb7af294d5d9 403 unsigned char output_buf[PRV_DER_MAX_BYTES];
Simon Cooksey 0:fb7af294d5d9 404 const char *begin, *end;
Simon Cooksey 0:fb7af294d5d9 405 size_t olen = 0;
Simon Cooksey 0:fb7af294d5d9 406
Simon Cooksey 0:fb7af294d5d9 407 if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
Simon Cooksey 0:fb7af294d5d9 408 return( ret );
Simon Cooksey 0:fb7af294d5d9 409
Simon Cooksey 0:fb7af294d5d9 410 #if defined(MBEDTLS_RSA_C)
Simon Cooksey 0:fb7af294d5d9 411 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
Simon Cooksey 0:fb7af294d5d9 412 {
Simon Cooksey 0:fb7af294d5d9 413 begin = PEM_BEGIN_PRIVATE_KEY_RSA;
Simon Cooksey 0:fb7af294d5d9 414 end = PEM_END_PRIVATE_KEY_RSA;
Simon Cooksey 0:fb7af294d5d9 415 }
Simon Cooksey 0:fb7af294d5d9 416 else
Simon Cooksey 0:fb7af294d5d9 417 #endif
Simon Cooksey 0:fb7af294d5d9 418 #if defined(MBEDTLS_ECP_C)
Simon Cooksey 0:fb7af294d5d9 419 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
Simon Cooksey 0:fb7af294d5d9 420 {
Simon Cooksey 0:fb7af294d5d9 421 begin = PEM_BEGIN_PRIVATE_KEY_EC;
Simon Cooksey 0:fb7af294d5d9 422 end = PEM_END_PRIVATE_KEY_EC;
Simon Cooksey 0:fb7af294d5d9 423 }
Simon Cooksey 0:fb7af294d5d9 424 else
Simon Cooksey 0:fb7af294d5d9 425 #endif
Simon Cooksey 0:fb7af294d5d9 426 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
Simon Cooksey 0:fb7af294d5d9 427
Simon Cooksey 0:fb7af294d5d9 428 if( ( ret = mbedtls_pem_write_buffer( begin, end,
Simon Cooksey 0:fb7af294d5d9 429 output_buf + sizeof(output_buf) - ret,
Simon Cooksey 0:fb7af294d5d9 430 ret, buf, size, &olen ) ) != 0 )
Simon Cooksey 0:fb7af294d5d9 431 {
Simon Cooksey 0:fb7af294d5d9 432 return( ret );
Simon Cooksey 0:fb7af294d5d9 433 }
Simon Cooksey 0:fb7af294d5d9 434
Simon Cooksey 0:fb7af294d5d9 435 return( 0 );
Simon Cooksey 0:fb7af294d5d9 436 }
Simon Cooksey 0:fb7af294d5d9 437 #endif /* MBEDTLS_PEM_WRITE_C */
Simon Cooksey 0:fb7af294d5d9 438
Simon Cooksey 0:fb7af294d5d9 439 #endif /* MBEDTLS_PK_WRITE_C */