EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

features/mbedtls/src/pkwrite.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * Public Key layer for writing key files and structures
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21
be_bryan 0:b74591d5ab33 22 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 23 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 24 #else
be_bryan 0:b74591d5ab33 25 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 26 #endif
be_bryan 0:b74591d5ab33 27
be_bryan 0:b74591d5ab33 28 #if defined(MBEDTLS_PK_WRITE_C)
be_bryan 0:b74591d5ab33 29
be_bryan 0:b74591d5ab33 30 #include "mbedtls/pk.h"
be_bryan 0:b74591d5ab33 31 #include "mbedtls/asn1write.h"
be_bryan 0:b74591d5ab33 32 #include "mbedtls/oid.h"
be_bryan 0:b74591d5ab33 33
be_bryan 0:b74591d5ab33 34 #include <string.h>
be_bryan 0:b74591d5ab33 35
be_bryan 0:b74591d5ab33 36 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 37 #include "mbedtls/rsa.h"
be_bryan 0:b74591d5ab33 38 #endif
be_bryan 0:b74591d5ab33 39 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 40 #include "mbedtls/ecp.h"
be_bryan 0:b74591d5ab33 41 #endif
be_bryan 0:b74591d5ab33 42 #if defined(MBEDTLS_ECDSA_C)
be_bryan 0:b74591d5ab33 43 #include "mbedtls/ecdsa.h"
be_bryan 0:b74591d5ab33 44 #endif
be_bryan 0:b74591d5ab33 45 #if defined(MBEDTLS_PEM_WRITE_C)
be_bryan 0:b74591d5ab33 46 #include "mbedtls/pem.h"
be_bryan 0:b74591d5ab33 47 #endif
be_bryan 0:b74591d5ab33 48
be_bryan 0:b74591d5ab33 49 #if defined(MBEDTLS_PLATFORM_C)
be_bryan 0:b74591d5ab33 50 #include "mbedtls/platform.h"
be_bryan 0:b74591d5ab33 51 #else
be_bryan 0:b74591d5ab33 52 #include <stdlib.h>
be_bryan 0:b74591d5ab33 53 #define mbedtls_calloc calloc
be_bryan 0:b74591d5ab33 54 #define mbedtls_free free
be_bryan 0:b74591d5ab33 55 #endif
be_bryan 0:b74591d5ab33 56
be_bryan 0:b74591d5ab33 57 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 58 /*
be_bryan 0:b74591d5ab33 59 * RSAPublicKey ::= SEQUENCE {
be_bryan 0:b74591d5ab33 60 * modulus INTEGER, -- n
be_bryan 0:b74591d5ab33 61 * publicExponent INTEGER -- e
be_bryan 0:b74591d5ab33 62 * }
be_bryan 0:b74591d5ab33 63 */
be_bryan 0:b74591d5ab33 64 static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
be_bryan 0:b74591d5ab33 65 mbedtls_rsa_context *rsa )
be_bryan 0:b74591d5ab33 66 {
be_bryan 0:b74591d5ab33 67 int ret;
be_bryan 0:b74591d5ab33 68 size_t len = 0;
be_bryan 0:b74591d5ab33 69
be_bryan 0:b74591d5ab33 70 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->E ) );
be_bryan 0:b74591d5ab33 71 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->N ) );
be_bryan 0:b74591d5ab33 72
be_bryan 0:b74591d5ab33 73 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
be_bryan 0:b74591d5ab33 74 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 75 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 76
be_bryan 0:b74591d5ab33 77 return( (int) len );
be_bryan 0:b74591d5ab33 78 }
be_bryan 0:b74591d5ab33 79 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 80
be_bryan 0:b74591d5ab33 81 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 82 /*
be_bryan 0:b74591d5ab33 83 * EC public key is an EC point
be_bryan 0:b74591d5ab33 84 */
be_bryan 0:b74591d5ab33 85 static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
be_bryan 0:b74591d5ab33 86 mbedtls_ecp_keypair *ec )
be_bryan 0:b74591d5ab33 87 {
be_bryan 0:b74591d5ab33 88 int ret;
be_bryan 0:b74591d5ab33 89 size_t len = 0;
be_bryan 0:b74591d5ab33 90 unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
be_bryan 0:b74591d5ab33 91
be_bryan 0:b74591d5ab33 92 if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
be_bryan 0:b74591d5ab33 93 MBEDTLS_ECP_PF_UNCOMPRESSED,
be_bryan 0:b74591d5ab33 94 &len, buf, sizeof( buf ) ) ) != 0 )
be_bryan 0:b74591d5ab33 95 {
be_bryan 0:b74591d5ab33 96 return( ret );
be_bryan 0:b74591d5ab33 97 }
be_bryan 0:b74591d5ab33 98
be_bryan 0:b74591d5ab33 99 if( *p < start || (size_t)( *p - start ) < len )
be_bryan 0:b74591d5ab33 100 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
be_bryan 0:b74591d5ab33 101
be_bryan 0:b74591d5ab33 102 *p -= len;
be_bryan 0:b74591d5ab33 103 memcpy( *p, buf, len );
be_bryan 0:b74591d5ab33 104
be_bryan 0:b74591d5ab33 105 return( (int) len );
be_bryan 0:b74591d5ab33 106 }
be_bryan 0:b74591d5ab33 107
be_bryan 0:b74591d5ab33 108 /*
be_bryan 0:b74591d5ab33 109 * ECParameters ::= CHOICE {
be_bryan 0:b74591d5ab33 110 * namedCurve OBJECT IDENTIFIER
be_bryan 0:b74591d5ab33 111 * }
be_bryan 0:b74591d5ab33 112 */
be_bryan 0:b74591d5ab33 113 static int pk_write_ec_param( unsigned char **p, unsigned char *start,
be_bryan 0:b74591d5ab33 114 mbedtls_ecp_keypair *ec )
be_bryan 0:b74591d5ab33 115 {
be_bryan 0:b74591d5ab33 116 int ret;
be_bryan 0:b74591d5ab33 117 size_t len = 0;
be_bryan 0:b74591d5ab33 118 const char *oid;
be_bryan 0:b74591d5ab33 119 size_t oid_len;
be_bryan 0:b74591d5ab33 120
be_bryan 0:b74591d5ab33 121 if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
be_bryan 0:b74591d5ab33 122 return( ret );
be_bryan 0:b74591d5ab33 123
be_bryan 0:b74591d5ab33 124 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
be_bryan 0:b74591d5ab33 125
be_bryan 0:b74591d5ab33 126 return( (int) len );
be_bryan 0:b74591d5ab33 127 }
be_bryan 0:b74591d5ab33 128 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 129
be_bryan 0:b74591d5ab33 130 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
be_bryan 0:b74591d5ab33 131 const mbedtls_pk_context *key )
be_bryan 0:b74591d5ab33 132 {
be_bryan 0:b74591d5ab33 133 int ret;
be_bryan 0:b74591d5ab33 134 size_t len = 0;
be_bryan 0:b74591d5ab33 135
be_bryan 0:b74591d5ab33 136 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 137 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
be_bryan 0:b74591d5ab33 138 MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
be_bryan 0:b74591d5ab33 139 else
be_bryan 0:b74591d5ab33 140 #endif
be_bryan 0:b74591d5ab33 141 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 142 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
be_bryan 0:b74591d5ab33 143 MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
be_bryan 0:b74591d5ab33 144 else
be_bryan 0:b74591d5ab33 145 #endif
be_bryan 0:b74591d5ab33 146 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 147
be_bryan 0:b74591d5ab33 148 return( (int) len );
be_bryan 0:b74591d5ab33 149 }
be_bryan 0:b74591d5ab33 150
be_bryan 0:b74591d5ab33 151 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
be_bryan 0:b74591d5ab33 152 {
be_bryan 0:b74591d5ab33 153 int ret;
be_bryan 0:b74591d5ab33 154 unsigned char *c;
be_bryan 0:b74591d5ab33 155 size_t len = 0, par_len = 0, oid_len;
be_bryan 0:b74591d5ab33 156 const char *oid;
be_bryan 0:b74591d5ab33 157
be_bryan 0:b74591d5ab33 158 c = buf + size;
be_bryan 0:b74591d5ab33 159
be_bryan 0:b74591d5ab33 160 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
be_bryan 0:b74591d5ab33 161
be_bryan 0:b74591d5ab33 162 if( c - buf < 1 )
be_bryan 0:b74591d5ab33 163 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
be_bryan 0:b74591d5ab33 164
be_bryan 0:b74591d5ab33 165 /*
be_bryan 0:b74591d5ab33 166 * SubjectPublicKeyInfo ::= SEQUENCE {
be_bryan 0:b74591d5ab33 167 * algorithm AlgorithmIdentifier,
be_bryan 0:b74591d5ab33 168 * subjectPublicKey BIT STRING }
be_bryan 0:b74591d5ab33 169 */
be_bryan 0:b74591d5ab33 170 *--c = 0;
be_bryan 0:b74591d5ab33 171 len += 1;
be_bryan 0:b74591d5ab33 172
be_bryan 0:b74591d5ab33 173 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
be_bryan 0:b74591d5ab33 174 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
be_bryan 0:b74591d5ab33 175
be_bryan 0:b74591d5ab33 176 if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
be_bryan 0:b74591d5ab33 177 &oid, &oid_len ) ) != 0 )
be_bryan 0:b74591d5ab33 178 {
be_bryan 0:b74591d5ab33 179 return( ret );
be_bryan 0:b74591d5ab33 180 }
be_bryan 0:b74591d5ab33 181
be_bryan 0:b74591d5ab33 182 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 183 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
be_bryan 0:b74591d5ab33 184 {
be_bryan 0:b74591d5ab33 185 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
be_bryan 0:b74591d5ab33 186 }
be_bryan 0:b74591d5ab33 187 #endif
be_bryan 0:b74591d5ab33 188
be_bryan 0:b74591d5ab33 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
be_bryan 0:b74591d5ab33 190 par_len ) );
be_bryan 0:b74591d5ab33 191
be_bryan 0:b74591d5ab33 192 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
be_bryan 0:b74591d5ab33 193 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 194 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 195
be_bryan 0:b74591d5ab33 196 return( (int) len );
be_bryan 0:b74591d5ab33 197 }
be_bryan 0:b74591d5ab33 198
be_bryan 0:b74591d5ab33 199 int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
be_bryan 0:b74591d5ab33 200 {
be_bryan 0:b74591d5ab33 201 int ret;
be_bryan 0:b74591d5ab33 202 unsigned char *c = buf + size;
be_bryan 0:b74591d5ab33 203 size_t len = 0;
be_bryan 0:b74591d5ab33 204
be_bryan 0:b74591d5ab33 205 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 206 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
be_bryan 0:b74591d5ab33 207 {
be_bryan 0:b74591d5ab33 208 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
be_bryan 0:b74591d5ab33 209
be_bryan 0:b74591d5ab33 210 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->QP ) );
be_bryan 0:b74591d5ab33 211 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DQ ) );
be_bryan 0:b74591d5ab33 212 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DP ) );
be_bryan 0:b74591d5ab33 213 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->Q ) );
be_bryan 0:b74591d5ab33 214 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->P ) );
be_bryan 0:b74591d5ab33 215 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->D ) );
be_bryan 0:b74591d5ab33 216 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->E ) );
be_bryan 0:b74591d5ab33 217 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->N ) );
be_bryan 0:b74591d5ab33 218 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
be_bryan 0:b74591d5ab33 219
be_bryan 0:b74591d5ab33 220 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
be_bryan 0:b74591d5ab33 221 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 222 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 223 }
be_bryan 0:b74591d5ab33 224 else
be_bryan 0:b74591d5ab33 225 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 226 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 227 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
be_bryan 0:b74591d5ab33 228 {
be_bryan 0:b74591d5ab33 229 mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
be_bryan 0:b74591d5ab33 230 size_t pub_len = 0, par_len = 0;
be_bryan 0:b74591d5ab33 231
be_bryan 0:b74591d5ab33 232 /*
be_bryan 0:b74591d5ab33 233 * RFC 5915, or SEC1 Appendix C.4
be_bryan 0:b74591d5ab33 234 *
be_bryan 0:b74591d5ab33 235 * ECPrivateKey ::= SEQUENCE {
be_bryan 0:b74591d5ab33 236 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
be_bryan 0:b74591d5ab33 237 * privateKey OCTET STRING,
be_bryan 0:b74591d5ab33 238 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
be_bryan 0:b74591d5ab33 239 * publicKey [1] BIT STRING OPTIONAL
be_bryan 0:b74591d5ab33 240 * }
be_bryan 0:b74591d5ab33 241 */
be_bryan 0:b74591d5ab33 242
be_bryan 0:b74591d5ab33 243 /* publicKey */
be_bryan 0:b74591d5ab33 244 MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
be_bryan 0:b74591d5ab33 245
be_bryan 0:b74591d5ab33 246 if( c - buf < 1 )
be_bryan 0:b74591d5ab33 247 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
be_bryan 0:b74591d5ab33 248 *--c = 0;
be_bryan 0:b74591d5ab33 249 pub_len += 1;
be_bryan 0:b74591d5ab33 250
be_bryan 0:b74591d5ab33 251 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
be_bryan 0:b74591d5ab33 252 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
be_bryan 0:b74591d5ab33 253
be_bryan 0:b74591d5ab33 254 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
be_bryan 0:b74591d5ab33 255 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
be_bryan 0:b74591d5ab33 256 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
be_bryan 0:b74591d5ab33 257 len += pub_len;
be_bryan 0:b74591d5ab33 258
be_bryan 0:b74591d5ab33 259 /* parameters */
be_bryan 0:b74591d5ab33 260 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
be_bryan 0:b74591d5ab33 261
be_bryan 0:b74591d5ab33 262 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
be_bryan 0:b74591d5ab33 263 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
be_bryan 0:b74591d5ab33 264 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
be_bryan 0:b74591d5ab33 265 len += par_len;
be_bryan 0:b74591d5ab33 266
be_bryan 0:b74591d5ab33 267 /* privateKey: write as MPI then fix tag */
be_bryan 0:b74591d5ab33 268 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
be_bryan 0:b74591d5ab33 269 *c = MBEDTLS_ASN1_OCTET_STRING;
be_bryan 0:b74591d5ab33 270
be_bryan 0:b74591d5ab33 271 /* version */
be_bryan 0:b74591d5ab33 272 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
be_bryan 0:b74591d5ab33 273
be_bryan 0:b74591d5ab33 274 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
be_bryan 0:b74591d5ab33 275 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 276 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 277 }
be_bryan 0:b74591d5ab33 278 else
be_bryan 0:b74591d5ab33 279 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 280 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 281
be_bryan 0:b74591d5ab33 282 return( (int) len );
be_bryan 0:b74591d5ab33 283 }
be_bryan 0:b74591d5ab33 284
be_bryan 0:b74591d5ab33 285 #if defined(MBEDTLS_PEM_WRITE_C)
be_bryan 0:b74591d5ab33 286
be_bryan 0:b74591d5ab33 287 #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
be_bryan 0:b74591d5ab33 288 #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
be_bryan 0:b74591d5ab33 289
be_bryan 0:b74591d5ab33 290 #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
be_bryan 0:b74591d5ab33 291 #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
be_bryan 0:b74591d5ab33 292 #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
be_bryan 0:b74591d5ab33 293 #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
be_bryan 0:b74591d5ab33 294
be_bryan 0:b74591d5ab33 295 /*
be_bryan 0:b74591d5ab33 296 * Max sizes of key per types. Shown as tag + len (+ content).
be_bryan 0:b74591d5ab33 297 */
be_bryan 0:b74591d5ab33 298
be_bryan 0:b74591d5ab33 299 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 300 /*
be_bryan 0:b74591d5ab33 301 * RSA public keys:
be_bryan 0:b74591d5ab33 302 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
be_bryan 0:b74591d5ab33 303 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
be_bryan 0:b74591d5ab33 304 * + 1 + 1 + 9 (rsa oid)
be_bryan 0:b74591d5ab33 305 * + 1 + 1 (params null)
be_bryan 0:b74591d5ab33 306 * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
be_bryan 0:b74591d5ab33 307 * RSAPublicKey ::= SEQUENCE { 1 + 3
be_bryan 0:b74591d5ab33 308 * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
be_bryan 0:b74591d5ab33 309 * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
be_bryan 0:b74591d5ab33 310 * }
be_bryan 0:b74591d5ab33 311 */
be_bryan 0:b74591d5ab33 312 #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
be_bryan 0:b74591d5ab33 313
be_bryan 0:b74591d5ab33 314 /*
be_bryan 0:b74591d5ab33 315 * RSA private keys:
be_bryan 0:b74591d5ab33 316 * RSAPrivateKey ::= SEQUENCE { 1 + 3
be_bryan 0:b74591d5ab33 317 * version Version, 1 + 1 + 1
be_bryan 0:b74591d5ab33 318 * modulus INTEGER, 1 + 3 + MPI_MAX + 1
be_bryan 0:b74591d5ab33 319 * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
be_bryan 0:b74591d5ab33 320 * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
be_bryan 0:b74591d5ab33 321 * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
be_bryan 0:b74591d5ab33 322 * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
be_bryan 0:b74591d5ab33 323 * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
be_bryan 0:b74591d5ab33 324 * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
be_bryan 0:b74591d5ab33 325 * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
be_bryan 0:b74591d5ab33 326 * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
be_bryan 0:b74591d5ab33 327 * }
be_bryan 0:b74591d5ab33 328 */
be_bryan 0:b74591d5ab33 329 #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
be_bryan 0:b74591d5ab33 330 MBEDTLS_MPI_MAX_SIZE % 2
be_bryan 0:b74591d5ab33 331 #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
be_bryan 0:b74591d5ab33 332 + 5 * MPI_MAX_SIZE_2
be_bryan 0:b74591d5ab33 333
be_bryan 0:b74591d5ab33 334 #else /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 335
be_bryan 0:b74591d5ab33 336 #define RSA_PUB_DER_MAX_BYTES 0
be_bryan 0:b74591d5ab33 337 #define RSA_PRV_DER_MAX_BYTES 0
be_bryan 0:b74591d5ab33 338
be_bryan 0:b74591d5ab33 339 #endif /* MBEDTLS_RSA_C */
be_bryan 0:b74591d5ab33 340
be_bryan 0:b74591d5ab33 341 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 342 /*
be_bryan 0:b74591d5ab33 343 * EC public keys:
be_bryan 0:b74591d5ab33 344 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
be_bryan 0:b74591d5ab33 345 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
be_bryan 0:b74591d5ab33 346 * + 1 + 1 + 7 (ec oid)
be_bryan 0:b74591d5ab33 347 * + 1 + 1 + 9 (namedCurve oid)
be_bryan 0:b74591d5ab33 348 * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
be_bryan 0:b74591d5ab33 349 * + 1 (point format) [1]
be_bryan 0:b74591d5ab33 350 * + 2 * ECP_MAX (coords) [1]
be_bryan 0:b74591d5ab33 351 * }
be_bryan 0:b74591d5ab33 352 */
be_bryan 0:b74591d5ab33 353 #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
be_bryan 0:b74591d5ab33 354
be_bryan 0:b74591d5ab33 355 /*
be_bryan 0:b74591d5ab33 356 * EC private keys:
be_bryan 0:b74591d5ab33 357 * ECPrivateKey ::= SEQUENCE { 1 + 2
be_bryan 0:b74591d5ab33 358 * version INTEGER , 1 + 1 + 1
be_bryan 0:b74591d5ab33 359 * privateKey OCTET STRING, 1 + 1 + ECP_MAX
be_bryan 0:b74591d5ab33 360 * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
be_bryan 0:b74591d5ab33 361 * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
be_bryan 0:b74591d5ab33 362 * }
be_bryan 0:b74591d5ab33 363 */
be_bryan 0:b74591d5ab33 364 #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
be_bryan 0:b74591d5ab33 365
be_bryan 0:b74591d5ab33 366 #else /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 367
be_bryan 0:b74591d5ab33 368 #define ECP_PUB_DER_MAX_BYTES 0
be_bryan 0:b74591d5ab33 369 #define ECP_PRV_DER_MAX_BYTES 0
be_bryan 0:b74591d5ab33 370
be_bryan 0:b74591d5ab33 371 #endif /* MBEDTLS_ECP_C */
be_bryan 0:b74591d5ab33 372
be_bryan 0:b74591d5ab33 373 #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
be_bryan 0:b74591d5ab33 374 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
be_bryan 0:b74591d5ab33 375 #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
be_bryan 0:b74591d5ab33 376 RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
be_bryan 0:b74591d5ab33 377
be_bryan 0:b74591d5ab33 378 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
be_bryan 0:b74591d5ab33 379 {
be_bryan 0:b74591d5ab33 380 int ret;
be_bryan 0:b74591d5ab33 381 unsigned char output_buf[PUB_DER_MAX_BYTES];
be_bryan 0:b74591d5ab33 382 size_t olen = 0;
be_bryan 0:b74591d5ab33 383
be_bryan 0:b74591d5ab33 384 if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
be_bryan 0:b74591d5ab33 385 sizeof(output_buf) ) ) < 0 )
be_bryan 0:b74591d5ab33 386 {
be_bryan 0:b74591d5ab33 387 return( ret );
be_bryan 0:b74591d5ab33 388 }
be_bryan 0:b74591d5ab33 389
be_bryan 0:b74591d5ab33 390 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
be_bryan 0:b74591d5ab33 391 output_buf + sizeof(output_buf) - ret,
be_bryan 0:b74591d5ab33 392 ret, buf, size, &olen ) ) != 0 )
be_bryan 0:b74591d5ab33 393 {
be_bryan 0:b74591d5ab33 394 return( ret );
be_bryan 0:b74591d5ab33 395 }
be_bryan 0:b74591d5ab33 396
be_bryan 0:b74591d5ab33 397 return( 0 );
be_bryan 0:b74591d5ab33 398 }
be_bryan 0:b74591d5ab33 399
be_bryan 0:b74591d5ab33 400 int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
be_bryan 0:b74591d5ab33 401 {
be_bryan 0:b74591d5ab33 402 int ret;
be_bryan 0:b74591d5ab33 403 unsigned char output_buf[PRV_DER_MAX_BYTES];
be_bryan 0:b74591d5ab33 404 const char *begin, *end;
be_bryan 0:b74591d5ab33 405 size_t olen = 0;
be_bryan 0:b74591d5ab33 406
be_bryan 0:b74591d5ab33 407 if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
be_bryan 0:b74591d5ab33 408 return( ret );
be_bryan 0:b74591d5ab33 409
be_bryan 0:b74591d5ab33 410 #if defined(MBEDTLS_RSA_C)
be_bryan 0:b74591d5ab33 411 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
be_bryan 0:b74591d5ab33 412 {
be_bryan 0:b74591d5ab33 413 begin = PEM_BEGIN_PRIVATE_KEY_RSA;
be_bryan 0:b74591d5ab33 414 end = PEM_END_PRIVATE_KEY_RSA;
be_bryan 0:b74591d5ab33 415 }
be_bryan 0:b74591d5ab33 416 else
be_bryan 0:b74591d5ab33 417 #endif
be_bryan 0:b74591d5ab33 418 #if defined(MBEDTLS_ECP_C)
be_bryan 0:b74591d5ab33 419 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
be_bryan 0:b74591d5ab33 420 {
be_bryan 0:b74591d5ab33 421 begin = PEM_BEGIN_PRIVATE_KEY_EC;
be_bryan 0:b74591d5ab33 422 end = PEM_END_PRIVATE_KEY_EC;
be_bryan 0:b74591d5ab33 423 }
be_bryan 0:b74591d5ab33 424 else
be_bryan 0:b74591d5ab33 425 #endif
be_bryan 0:b74591d5ab33 426 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
be_bryan 0:b74591d5ab33 427
be_bryan 0:b74591d5ab33 428 if( ( ret = mbedtls_pem_write_buffer( begin, end,
be_bryan 0:b74591d5ab33 429 output_buf + sizeof(output_buf) - ret,
be_bryan 0:b74591d5ab33 430 ret, buf, size, &olen ) ) != 0 )
be_bryan 0:b74591d5ab33 431 {
be_bryan 0:b74591d5ab33 432 return( ret );
be_bryan 0:b74591d5ab33 433 }
be_bryan 0:b74591d5ab33 434
be_bryan 0:b74591d5ab33 435 return( 0 );
be_bryan 0:b74591d5ab33 436 }
be_bryan 0:b74591d5ab33 437 #endif /* MBEDTLS_PEM_WRITE_C */
be_bryan 0:b74591d5ab33 438
be_bryan 0:b74591d5ab33 439 #endif /* MBEDTLS_PK_WRITE_C */