Austin Blackstone / Mbed 2 deprecated client-lwip-lightswitch-demo-expanded

mbed client lightswitch demo

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by Austin Blackstone

mbedtls/source/pkwrite.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * Public Key layer for writing key files and structures
mbedAustin 11:cada08fc8a70 3 *
mbedAustin 11:cada08fc8a70 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
mbedAustin 11:cada08fc8a70 5 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 6 *
mbedAustin 11:cada08fc8a70 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
mbedAustin 11:cada08fc8a70 8 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 9 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 10 *
mbedAustin 11:cada08fc8a70 11 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 12 *
mbedAustin 11:cada08fc8a70 13 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 16 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 17 * limitations under the License.
mbedAustin 11:cada08fc8a70 18 *
mbedAustin 11:cada08fc8a70 19 * This file is part of mbed TLS (https://tls.mbed.org)
mbedAustin 11:cada08fc8a70 20 */
mbedAustin 11:cada08fc8a70 21
mbedAustin 11:cada08fc8a70 22 #if !defined(MBEDTLS_CONFIG_FILE)
mbedAustin 11:cada08fc8a70 23 #include "mbedtls/config.h"
mbedAustin 11:cada08fc8a70 24 #else
mbedAustin 11:cada08fc8a70 25 #include MBEDTLS_CONFIG_FILE
mbedAustin 11:cada08fc8a70 26 #endif
mbedAustin 11:cada08fc8a70 27
mbedAustin 11:cada08fc8a70 28 #if defined(MBEDTLS_PK_WRITE_C)
mbedAustin 11:cada08fc8a70 29
mbedAustin 11:cada08fc8a70 30 #include "mbedtls/pk.h"
mbedAustin 11:cada08fc8a70 31 #include "mbedtls/asn1write.h"
mbedAustin 11:cada08fc8a70 32 #include "mbedtls/oid.h"
mbedAustin 11:cada08fc8a70 33
mbedAustin 11:cada08fc8a70 34 #include <string.h>
mbedAustin 11:cada08fc8a70 35
mbedAustin 11:cada08fc8a70 36 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 37 #include "mbedtls/rsa.h"
mbedAustin 11:cada08fc8a70 38 #endif
mbedAustin 11:cada08fc8a70 39 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 40 #include "mbedtls/ecp.h"
mbedAustin 11:cada08fc8a70 41 #endif
mbedAustin 11:cada08fc8a70 42 #if defined(MBEDTLS_ECDSA_C)
mbedAustin 11:cada08fc8a70 43 #include "mbedtls/ecdsa.h"
mbedAustin 11:cada08fc8a70 44 #endif
mbedAustin 11:cada08fc8a70 45 #if defined(MBEDTLS_PEM_WRITE_C)
mbedAustin 11:cada08fc8a70 46 #include "mbedtls/pem.h"
mbedAustin 11:cada08fc8a70 47 #endif
mbedAustin 11:cada08fc8a70 48
mbedAustin 11:cada08fc8a70 49 #if defined(MBEDTLS_PLATFORM_C)
mbedAustin 11:cada08fc8a70 50 #include "mbedtls/platform.h"
mbedAustin 11:cada08fc8a70 51 #else
mbedAustin 11:cada08fc8a70 52 #include <stdlib.h>
mbedAustin 11:cada08fc8a70 53 #define mbedtls_calloc calloc
mbedAustin 11:cada08fc8a70 54 #define mbedtls_free free
mbedAustin 11:cada08fc8a70 55 #endif
mbedAustin 11:cada08fc8a70 56
mbedAustin 11:cada08fc8a70 57 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 58 /*
mbedAustin 11:cada08fc8a70 59 * RSAPublicKey ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 60 * modulus INTEGER, -- n
mbedAustin 11:cada08fc8a70 61 * publicExponent INTEGER -- e
mbedAustin 11:cada08fc8a70 62 * }
mbedAustin 11:cada08fc8a70 63 */
mbedAustin 11:cada08fc8a70 64 static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
mbedAustin 11:cada08fc8a70 65 mbedtls_rsa_context *rsa )
mbedAustin 11:cada08fc8a70 66 {
mbedAustin 11:cada08fc8a70 67 int ret;
mbedAustin 11:cada08fc8a70 68 size_t len = 0;
mbedAustin 11:cada08fc8a70 69
mbedAustin 11:cada08fc8a70 70 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->E ) );
mbedAustin 11:cada08fc8a70 71 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->N ) );
mbedAustin 11:cada08fc8a70 72
mbedAustin 11:cada08fc8a70 73 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
mbedAustin 11:cada08fc8a70 74 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
mbedAustin 11:cada08fc8a70 75 MBEDTLS_ASN1_SEQUENCE ) );
mbedAustin 11:cada08fc8a70 76
mbedAustin 11:cada08fc8a70 77 return( (int) len );
mbedAustin 11:cada08fc8a70 78 }
mbedAustin 11:cada08fc8a70 79 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 80
mbedAustin 11:cada08fc8a70 81 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 82 /*
mbedAustin 11:cada08fc8a70 83 * EC public key is an EC point
mbedAustin 11:cada08fc8a70 84 */
mbedAustin 11:cada08fc8a70 85 static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
mbedAustin 11:cada08fc8a70 86 mbedtls_ecp_keypair *ec )
mbedAustin 11:cada08fc8a70 87 {
mbedAustin 11:cada08fc8a70 88 int ret;
mbedAustin 11:cada08fc8a70 89 size_t len = 0;
mbedAustin 11:cada08fc8a70 90 unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
mbedAustin 11:cada08fc8a70 91
mbedAustin 11:cada08fc8a70 92 if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
mbedAustin 11:cada08fc8a70 93 MBEDTLS_ECP_PF_UNCOMPRESSED,
mbedAustin 11:cada08fc8a70 94 &len, buf, sizeof( buf ) ) ) != 0 )
mbedAustin 11:cada08fc8a70 95 {
mbedAustin 11:cada08fc8a70 96 return( ret );
mbedAustin 11:cada08fc8a70 97 }
mbedAustin 11:cada08fc8a70 98
mbedAustin 11:cada08fc8a70 99 if( *p < start || (size_t)( *p - start ) < len )
mbedAustin 11:cada08fc8a70 100 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
mbedAustin 11:cada08fc8a70 101
mbedAustin 11:cada08fc8a70 102 *p -= len;
mbedAustin 11:cada08fc8a70 103 memcpy( *p, buf, len );
mbedAustin 11:cada08fc8a70 104
mbedAustin 11:cada08fc8a70 105 return( (int) len );
mbedAustin 11:cada08fc8a70 106 }
mbedAustin 11:cada08fc8a70 107
mbedAustin 11:cada08fc8a70 108 /*
mbedAustin 11:cada08fc8a70 109 * ECParameters ::= CHOICE {
mbedAustin 11:cada08fc8a70 110 * namedCurve OBJECT IDENTIFIER
mbedAustin 11:cada08fc8a70 111 * }
mbedAustin 11:cada08fc8a70 112 */
mbedAustin 11:cada08fc8a70 113 static int pk_write_ec_param( unsigned char **p, unsigned char *start,
mbedAustin 11:cada08fc8a70 114 mbedtls_ecp_keypair *ec )
mbedAustin 11:cada08fc8a70 115 {
mbedAustin 11:cada08fc8a70 116 int ret;
mbedAustin 11:cada08fc8a70 117 size_t len = 0;
mbedAustin 11:cada08fc8a70 118 const char *oid;
mbedAustin 11:cada08fc8a70 119 size_t oid_len;
mbedAustin 11:cada08fc8a70 120
mbedAustin 11:cada08fc8a70 121 if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
mbedAustin 11:cada08fc8a70 122 return( ret );
mbedAustin 11:cada08fc8a70 123
mbedAustin 11:cada08fc8a70 124 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
mbedAustin 11:cada08fc8a70 125
mbedAustin 11:cada08fc8a70 126 return( (int) len );
mbedAustin 11:cada08fc8a70 127 }
mbedAustin 11:cada08fc8a70 128 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 129
mbedAustin 11:cada08fc8a70 130 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
mbedAustin 11:cada08fc8a70 131 const mbedtls_pk_context *key )
mbedAustin 11:cada08fc8a70 132 {
mbedAustin 11:cada08fc8a70 133 int ret;
mbedAustin 11:cada08fc8a70 134 size_t len = 0;
mbedAustin 11:cada08fc8a70 135
mbedAustin 11:cada08fc8a70 136 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 137 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
mbedAustin 11:cada08fc8a70 138 MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
mbedAustin 11:cada08fc8a70 139 else
mbedAustin 11:cada08fc8a70 140 #endif
mbedAustin 11:cada08fc8a70 141 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 142 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
mbedAustin 11:cada08fc8a70 143 MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
mbedAustin 11:cada08fc8a70 144 else
mbedAustin 11:cada08fc8a70 145 #endif
mbedAustin 11:cada08fc8a70 146 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
mbedAustin 11:cada08fc8a70 147
mbedAustin 11:cada08fc8a70 148 return( (int) len );
mbedAustin 11:cada08fc8a70 149 }
mbedAustin 11:cada08fc8a70 150
mbedAustin 11:cada08fc8a70 151 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
mbedAustin 11:cada08fc8a70 152 {
mbedAustin 11:cada08fc8a70 153 int ret;
mbedAustin 11:cada08fc8a70 154 unsigned char *c;
mbedAustin 11:cada08fc8a70 155 size_t len = 0, par_len = 0, oid_len;
mbedAustin 11:cada08fc8a70 156 const char *oid;
mbedAustin 11:cada08fc8a70 157
mbedAustin 11:cada08fc8a70 158 c = buf + size;
mbedAustin 11:cada08fc8a70 159
mbedAustin 11:cada08fc8a70 160 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
mbedAustin 11:cada08fc8a70 161
mbedAustin 11:cada08fc8a70 162 if( c - buf < 1 )
mbedAustin 11:cada08fc8a70 163 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
mbedAustin 11:cada08fc8a70 164
mbedAustin 11:cada08fc8a70 165 /*
mbedAustin 11:cada08fc8a70 166 * SubjectPublicKeyInfo ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 167 * algorithm AlgorithmIdentifier,
mbedAustin 11:cada08fc8a70 168 * subjectPublicKey BIT STRING }
mbedAustin 11:cada08fc8a70 169 */
mbedAustin 11:cada08fc8a70 170 *--c = 0;
mbedAustin 11:cada08fc8a70 171 len += 1;
mbedAustin 11:cada08fc8a70 172
mbedAustin 11:cada08fc8a70 173 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
mbedAustin 11:cada08fc8a70 174 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
mbedAustin 11:cada08fc8a70 175
mbedAustin 11:cada08fc8a70 176 if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
mbedAustin 11:cada08fc8a70 177 &oid, &oid_len ) ) != 0 )
mbedAustin 11:cada08fc8a70 178 {
mbedAustin 11:cada08fc8a70 179 return( ret );
mbedAustin 11:cada08fc8a70 180 }
mbedAustin 11:cada08fc8a70 181
mbedAustin 11:cada08fc8a70 182 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 183 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
mbedAustin 11:cada08fc8a70 184 {
mbedAustin 11:cada08fc8a70 185 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
mbedAustin 11:cada08fc8a70 186 }
mbedAustin 11:cada08fc8a70 187 #endif
mbedAustin 11:cada08fc8a70 188
mbedAustin 11:cada08fc8a70 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
mbedAustin 11:cada08fc8a70 190 par_len ) );
mbedAustin 11:cada08fc8a70 191
mbedAustin 11:cada08fc8a70 192 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
mbedAustin 11:cada08fc8a70 193 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
mbedAustin 11:cada08fc8a70 194 MBEDTLS_ASN1_SEQUENCE ) );
mbedAustin 11:cada08fc8a70 195
mbedAustin 11:cada08fc8a70 196 return( (int) len );
mbedAustin 11:cada08fc8a70 197 }
mbedAustin 11:cada08fc8a70 198
mbedAustin 11:cada08fc8a70 199 int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
mbedAustin 11:cada08fc8a70 200 {
mbedAustin 11:cada08fc8a70 201 int ret;
mbedAustin 11:cada08fc8a70 202 unsigned char *c = buf + size;
mbedAustin 11:cada08fc8a70 203 size_t len = 0;
mbedAustin 11:cada08fc8a70 204
mbedAustin 11:cada08fc8a70 205 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 206 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
mbedAustin 11:cada08fc8a70 207 {
mbedAustin 11:cada08fc8a70 208 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
mbedAustin 11:cada08fc8a70 209
mbedAustin 11:cada08fc8a70 210 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->QP ) );
mbedAustin 11:cada08fc8a70 211 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DQ ) );
mbedAustin 11:cada08fc8a70 212 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DP ) );
mbedAustin 11:cada08fc8a70 213 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->Q ) );
mbedAustin 11:cada08fc8a70 214 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->P ) );
mbedAustin 11:cada08fc8a70 215 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->D ) );
mbedAustin 11:cada08fc8a70 216 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->E ) );
mbedAustin 11:cada08fc8a70 217 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->N ) );
mbedAustin 11:cada08fc8a70 218 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
mbedAustin 11:cada08fc8a70 219
mbedAustin 11:cada08fc8a70 220 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
mbedAustin 11:cada08fc8a70 221 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
mbedAustin 11:cada08fc8a70 222 MBEDTLS_ASN1_SEQUENCE ) );
mbedAustin 11:cada08fc8a70 223 }
mbedAustin 11:cada08fc8a70 224 else
mbedAustin 11:cada08fc8a70 225 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 226 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 227 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
mbedAustin 11:cada08fc8a70 228 {
mbedAustin 11:cada08fc8a70 229 mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
mbedAustin 11:cada08fc8a70 230 size_t pub_len = 0, par_len = 0;
mbedAustin 11:cada08fc8a70 231
mbedAustin 11:cada08fc8a70 232 /*
mbedAustin 11:cada08fc8a70 233 * RFC 5915, or SEC1 Appendix C.4
mbedAustin 11:cada08fc8a70 234 *
mbedAustin 11:cada08fc8a70 235 * ECPrivateKey ::= SEQUENCE {
mbedAustin 11:cada08fc8a70 236 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
mbedAustin 11:cada08fc8a70 237 * privateKey OCTET STRING,
mbedAustin 11:cada08fc8a70 238 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
mbedAustin 11:cada08fc8a70 239 * publicKey [1] BIT STRING OPTIONAL
mbedAustin 11:cada08fc8a70 240 * }
mbedAustin 11:cada08fc8a70 241 */
mbedAustin 11:cada08fc8a70 242
mbedAustin 11:cada08fc8a70 243 /* publicKey */
mbedAustin 11:cada08fc8a70 244 MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
mbedAustin 11:cada08fc8a70 245
mbedAustin 11:cada08fc8a70 246 if( c - buf < 1 )
mbedAustin 11:cada08fc8a70 247 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
mbedAustin 11:cada08fc8a70 248 *--c = 0;
mbedAustin 11:cada08fc8a70 249 pub_len += 1;
mbedAustin 11:cada08fc8a70 250
mbedAustin 11:cada08fc8a70 251 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
mbedAustin 11:cada08fc8a70 252 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
mbedAustin 11:cada08fc8a70 253
mbedAustin 11:cada08fc8a70 254 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
mbedAustin 11:cada08fc8a70 255 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
mbedAustin 11:cada08fc8a70 256 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
mbedAustin 11:cada08fc8a70 257 len += pub_len;
mbedAustin 11:cada08fc8a70 258
mbedAustin 11:cada08fc8a70 259 /* parameters */
mbedAustin 11:cada08fc8a70 260 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
mbedAustin 11:cada08fc8a70 261
mbedAustin 11:cada08fc8a70 262 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
mbedAustin 11:cada08fc8a70 263 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
mbedAustin 11:cada08fc8a70 264 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
mbedAustin 11:cada08fc8a70 265 len += par_len;
mbedAustin 11:cada08fc8a70 266
mbedAustin 11:cada08fc8a70 267 /* privateKey: write as MPI then fix tag */
mbedAustin 11:cada08fc8a70 268 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
mbedAustin 11:cada08fc8a70 269 *c = MBEDTLS_ASN1_OCTET_STRING;
mbedAustin 11:cada08fc8a70 270
mbedAustin 11:cada08fc8a70 271 /* version */
mbedAustin 11:cada08fc8a70 272 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
mbedAustin 11:cada08fc8a70 273
mbedAustin 11:cada08fc8a70 274 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
mbedAustin 11:cada08fc8a70 275 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
mbedAustin 11:cada08fc8a70 276 MBEDTLS_ASN1_SEQUENCE ) );
mbedAustin 11:cada08fc8a70 277 }
mbedAustin 11:cada08fc8a70 278 else
mbedAustin 11:cada08fc8a70 279 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 280 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
mbedAustin 11:cada08fc8a70 281
mbedAustin 11:cada08fc8a70 282 return( (int) len );
mbedAustin 11:cada08fc8a70 283 }
mbedAustin 11:cada08fc8a70 284
mbedAustin 11:cada08fc8a70 285 #if defined(MBEDTLS_PEM_WRITE_C)
mbedAustin 11:cada08fc8a70 286
mbedAustin 11:cada08fc8a70 287 #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
mbedAustin 11:cada08fc8a70 288 #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
mbedAustin 11:cada08fc8a70 289
mbedAustin 11:cada08fc8a70 290 #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
mbedAustin 11:cada08fc8a70 291 #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
mbedAustin 11:cada08fc8a70 292 #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
mbedAustin 11:cada08fc8a70 293 #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
mbedAustin 11:cada08fc8a70 294
mbedAustin 11:cada08fc8a70 295 /*
mbedAustin 11:cada08fc8a70 296 * Max sizes of key per types. Shown as tag + len (+ content).
mbedAustin 11:cada08fc8a70 297 */
mbedAustin 11:cada08fc8a70 298
mbedAustin 11:cada08fc8a70 299 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 300 /*
mbedAustin 11:cada08fc8a70 301 * RSA public keys:
mbedAustin 11:cada08fc8a70 302 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
mbedAustin 11:cada08fc8a70 303 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
mbedAustin 11:cada08fc8a70 304 * + 1 + 1 + 9 (rsa oid)
mbedAustin 11:cada08fc8a70 305 * + 1 + 1 (params null)
mbedAustin 11:cada08fc8a70 306 * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
mbedAustin 11:cada08fc8a70 307 * RSAPublicKey ::= SEQUENCE { 1 + 3
mbedAustin 11:cada08fc8a70 308 * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
mbedAustin 11:cada08fc8a70 309 * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
mbedAustin 11:cada08fc8a70 310 * }
mbedAustin 11:cada08fc8a70 311 */
mbedAustin 11:cada08fc8a70 312 #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
mbedAustin 11:cada08fc8a70 313
mbedAustin 11:cada08fc8a70 314 /*
mbedAustin 11:cada08fc8a70 315 * RSA private keys:
mbedAustin 11:cada08fc8a70 316 * RSAPrivateKey ::= SEQUENCE { 1 + 3
mbedAustin 11:cada08fc8a70 317 * version Version, 1 + 1 + 1
mbedAustin 11:cada08fc8a70 318 * modulus INTEGER, 1 + 3 + MPI_MAX + 1
mbedAustin 11:cada08fc8a70 319 * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
mbedAustin 11:cada08fc8a70 320 * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
mbedAustin 11:cada08fc8a70 321 * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
mbedAustin 11:cada08fc8a70 322 * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
mbedAustin 11:cada08fc8a70 323 * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
mbedAustin 11:cada08fc8a70 324 * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
mbedAustin 11:cada08fc8a70 325 * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
mbedAustin 11:cada08fc8a70 326 * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
mbedAustin 11:cada08fc8a70 327 * }
mbedAustin 11:cada08fc8a70 328 */
mbedAustin 11:cada08fc8a70 329 #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
mbedAustin 11:cada08fc8a70 330 MBEDTLS_MPI_MAX_SIZE % 2
mbedAustin 11:cada08fc8a70 331 #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
mbedAustin 11:cada08fc8a70 332 + 5 * MPI_MAX_SIZE_2
mbedAustin 11:cada08fc8a70 333
mbedAustin 11:cada08fc8a70 334 #else /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 335
mbedAustin 11:cada08fc8a70 336 #define RSA_PUB_DER_MAX_BYTES 0
mbedAustin 11:cada08fc8a70 337 #define RSA_PRV_DER_MAX_BYTES 0
mbedAustin 11:cada08fc8a70 338
mbedAustin 11:cada08fc8a70 339 #endif /* MBEDTLS_RSA_C */
mbedAustin 11:cada08fc8a70 340
mbedAustin 11:cada08fc8a70 341 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 342 /*
mbedAustin 11:cada08fc8a70 343 * EC public keys:
mbedAustin 11:cada08fc8a70 344 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
mbedAustin 11:cada08fc8a70 345 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
mbedAustin 11:cada08fc8a70 346 * + 1 + 1 + 7 (ec oid)
mbedAustin 11:cada08fc8a70 347 * + 1 + 1 + 9 (namedCurve oid)
mbedAustin 11:cada08fc8a70 348 * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
mbedAustin 11:cada08fc8a70 349 * + 1 (point format) [1]
mbedAustin 11:cada08fc8a70 350 * + 2 * ECP_MAX (coords) [1]
mbedAustin 11:cada08fc8a70 351 * }
mbedAustin 11:cada08fc8a70 352 */
mbedAustin 11:cada08fc8a70 353 #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
mbedAustin 11:cada08fc8a70 354
mbedAustin 11:cada08fc8a70 355 /*
mbedAustin 11:cada08fc8a70 356 * EC private keys:
mbedAustin 11:cada08fc8a70 357 * ECPrivateKey ::= SEQUENCE { 1 + 2
mbedAustin 11:cada08fc8a70 358 * version INTEGER , 1 + 1 + 1
mbedAustin 11:cada08fc8a70 359 * privateKey OCTET STRING, 1 + 1 + ECP_MAX
mbedAustin 11:cada08fc8a70 360 * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
mbedAustin 11:cada08fc8a70 361 * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
mbedAustin 11:cada08fc8a70 362 * }
mbedAustin 11:cada08fc8a70 363 */
mbedAustin 11:cada08fc8a70 364 #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
mbedAustin 11:cada08fc8a70 365
mbedAustin 11:cada08fc8a70 366 #else /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 367
mbedAustin 11:cada08fc8a70 368 #define ECP_PUB_DER_MAX_BYTES 0
mbedAustin 11:cada08fc8a70 369 #define ECP_PRV_DER_MAX_BYTES 0
mbedAustin 11:cada08fc8a70 370
mbedAustin 11:cada08fc8a70 371 #endif /* MBEDTLS_ECP_C */
mbedAustin 11:cada08fc8a70 372
mbedAustin 11:cada08fc8a70 373 #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
mbedAustin 11:cada08fc8a70 374 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
mbedAustin 11:cada08fc8a70 375 #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
mbedAustin 11:cada08fc8a70 376 RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
mbedAustin 11:cada08fc8a70 377
mbedAustin 11:cada08fc8a70 378 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
mbedAustin 11:cada08fc8a70 379 {
mbedAustin 11:cada08fc8a70 380 int ret;
mbedAustin 11:cada08fc8a70 381 unsigned char output_buf[PUB_DER_MAX_BYTES];
mbedAustin 11:cada08fc8a70 382 size_t olen = 0;
mbedAustin 11:cada08fc8a70 383
mbedAustin 11:cada08fc8a70 384 if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
mbedAustin 11:cada08fc8a70 385 sizeof(output_buf) ) ) < 0 )
mbedAustin 11:cada08fc8a70 386 {
mbedAustin 11:cada08fc8a70 387 return( ret );
mbedAustin 11:cada08fc8a70 388 }
mbedAustin 11:cada08fc8a70 389
mbedAustin 11:cada08fc8a70 390 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
mbedAustin 11:cada08fc8a70 391 output_buf + sizeof(output_buf) - ret,
mbedAustin 11:cada08fc8a70 392 ret, buf, size, &olen ) ) != 0 )
mbedAustin 11:cada08fc8a70 393 {
mbedAustin 11:cada08fc8a70 394 return( ret );
mbedAustin 11:cada08fc8a70 395 }
mbedAustin 11:cada08fc8a70 396
mbedAustin 11:cada08fc8a70 397 return( 0 );
mbedAustin 11:cada08fc8a70 398 }
mbedAustin 11:cada08fc8a70 399
mbedAustin 11:cada08fc8a70 400 int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
mbedAustin 11:cada08fc8a70 401 {
mbedAustin 11:cada08fc8a70 402 int ret;
mbedAustin 11:cada08fc8a70 403 unsigned char output_buf[PRV_DER_MAX_BYTES];
mbedAustin 11:cada08fc8a70 404 const char *begin, *end;
mbedAustin 11:cada08fc8a70 405 size_t olen = 0;
mbedAustin 11:cada08fc8a70 406
mbedAustin 11:cada08fc8a70 407 if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
mbedAustin 11:cada08fc8a70 408 return( ret );
mbedAustin 11:cada08fc8a70 409
mbedAustin 11:cada08fc8a70 410 #if defined(MBEDTLS_RSA_C)
mbedAustin 11:cada08fc8a70 411 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
mbedAustin 11:cada08fc8a70 412 {
mbedAustin 11:cada08fc8a70 413 begin = PEM_BEGIN_PRIVATE_KEY_RSA;
mbedAustin 11:cada08fc8a70 414 end = PEM_END_PRIVATE_KEY_RSA;
mbedAustin 11:cada08fc8a70 415 }
mbedAustin 11:cada08fc8a70 416 else
mbedAustin 11:cada08fc8a70 417 #endif
mbedAustin 11:cada08fc8a70 418 #if defined(MBEDTLS_ECP_C)
mbedAustin 11:cada08fc8a70 419 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
mbedAustin 11:cada08fc8a70 420 {
mbedAustin 11:cada08fc8a70 421 begin = PEM_BEGIN_PRIVATE_KEY_EC;
mbedAustin 11:cada08fc8a70 422 end = PEM_END_PRIVATE_KEY_EC;
mbedAustin 11:cada08fc8a70 423 }
mbedAustin 11:cada08fc8a70 424 else
mbedAustin 11:cada08fc8a70 425 #endif
mbedAustin 11:cada08fc8a70 426 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
mbedAustin 11:cada08fc8a70 427
mbedAustin 11:cada08fc8a70 428 if( ( ret = mbedtls_pem_write_buffer( begin, end,
mbedAustin 11:cada08fc8a70 429 output_buf + sizeof(output_buf) - ret,
mbedAustin 11:cada08fc8a70 430 ret, buf, size, &olen ) ) != 0 )
mbedAustin 11:cada08fc8a70 431 {
mbedAustin 11:cada08fc8a70 432 return( ret );
mbedAustin 11:cada08fc8a70 433 }
mbedAustin 11:cada08fc8a70 434
mbedAustin 11:cada08fc8a70 435 return( 0 );
mbedAustin 11:cada08fc8a70 436 }
mbedAustin 11:cada08fc8a70 437 #endif /* MBEDTLS_PEM_WRITE_C */
mbedAustin 11:cada08fc8a70 438
mbedAustin 11:cada08fc8a70 439 #endif /* MBEDTLS_PK_WRITE_C */