Greg Steiert / pegasus_dev

Dependents:   blinky_max32630fthr

features/mbedtls/src/pkwrite.c@3:1198227e6421, 2016-12-16 (annotated)

Committer:
switches
Date:
Fri Dec 16 16:27:57 2016 +0000
Revision:
3:1198227e6421
Parent:
0:5c4d7b2438d3 
Changed ADC scale for MAX32625 platforms to 1.2V full scale to match MAX32630 platforms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
switches 0:5c4d7b2438d3 1 /*
switches 0:5c4d7b2438d3 2 * Public Key layer for writing key files and structures
switches 0:5c4d7b2438d3 3 *
switches 0:5c4d7b2438d3 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
switches 0:5c4d7b2438d3 5 * SPDX-License-Identifier: Apache-2.0
switches 0:5c4d7b2438d3 6 *
switches 0:5c4d7b2438d3 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
switches 0:5c4d7b2438d3 8 * not use this file except in compliance with the License.
switches 0:5c4d7b2438d3 9 * You may obtain a copy of the License at
switches 0:5c4d7b2438d3 10 *
switches 0:5c4d7b2438d3 11 * http://www.apache.org/licenses/LICENSE-2.0
switches 0:5c4d7b2438d3 12 *
switches 0:5c4d7b2438d3 13 * Unless required by applicable law or agreed to in writing, software
switches 0:5c4d7b2438d3 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
switches 0:5c4d7b2438d3 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
switches 0:5c4d7b2438d3 16 * See the License for the specific language governing permissions and
switches 0:5c4d7b2438d3 17 * limitations under the License.
switches 0:5c4d7b2438d3 18 *
switches 0:5c4d7b2438d3 19 * This file is part of mbed TLS (https://tls.mbed.org)
switches 0:5c4d7b2438d3 20 */
switches 0:5c4d7b2438d3 21
switches 0:5c4d7b2438d3 22 #if !defined(MBEDTLS_CONFIG_FILE)
switches 0:5c4d7b2438d3 23 #include "mbedtls/config.h"
switches 0:5c4d7b2438d3 24 #else
switches 0:5c4d7b2438d3 25 #include MBEDTLS_CONFIG_FILE
switches 0:5c4d7b2438d3 26 #endif
switches 0:5c4d7b2438d3 27
switches 0:5c4d7b2438d3 28 #if defined(MBEDTLS_PK_WRITE_C)
switches 0:5c4d7b2438d3 29
switches 0:5c4d7b2438d3 30 #include "mbedtls/pk.h"
switches 0:5c4d7b2438d3 31 #include "mbedtls/asn1write.h"
switches 0:5c4d7b2438d3 32 #include "mbedtls/oid.h"
switches 0:5c4d7b2438d3 33
switches 0:5c4d7b2438d3 34 #include <string.h>
switches 0:5c4d7b2438d3 35
switches 0:5c4d7b2438d3 36 #if defined(MBEDTLS_RSA_C)
switches 0:5c4d7b2438d3 37 #include "mbedtls/rsa.h"
switches 0:5c4d7b2438d3 38 #endif
switches 0:5c4d7b2438d3 39 #if defined(MBEDTLS_ECP_C)
switches 0:5c4d7b2438d3 40 #include "mbedtls/ecp.h"
switches 0:5c4d7b2438d3 41 #endif
switches 0:5c4d7b2438d3 42 #if defined(MBEDTLS_ECDSA_C)
switches 0:5c4d7b2438d3 43 #include "mbedtls/ecdsa.h"
switches 0:5c4d7b2438d3 44 #endif
switches 0:5c4d7b2438d3 45 #if defined(MBEDTLS_PEM_WRITE_C)
switches 0:5c4d7b2438d3 46 #include "mbedtls/pem.h"
switches 0:5c4d7b2438d3 47 #endif
switches 0:5c4d7b2438d3 48
switches 0:5c4d7b2438d3 49 #if defined(MBEDTLS_PLATFORM_C)
switches 0:5c4d7b2438d3 50 #include "mbedtls/platform.h"
switches 0:5c4d7b2438d3 51 #else
switches 0:5c4d7b2438d3 52 #include <stdlib.h>
switches 0:5c4d7b2438d3 53 #define mbedtls_calloc calloc
switches 0:5c4d7b2438d3 54 #define mbedtls_free free
switches 0:5c4d7b2438d3 55 #endif
switches 0:5c4d7b2438d3 56
switches 0:5c4d7b2438d3 57 #if defined(MBEDTLS_RSA_C)
switches 0:5c4d7b2438d3 58 /*
switches 0:5c4d7b2438d3 59 * RSAPublicKey ::= SEQUENCE {
switches 0:5c4d7b2438d3 60 * modulus INTEGER, -- n
switches 0:5c4d7b2438d3 61 * publicExponent INTEGER -- e
switches 0:5c4d7b2438d3 62 * }
switches 0:5c4d7b2438d3 63 */
switches 0:5c4d7b2438d3 64 static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
switches 0:5c4d7b2438d3 65 mbedtls_rsa_context *rsa )
switches 0:5c4d7b2438d3 66 {
switches 0:5c4d7b2438d3 67 int ret;
switches 0:5c4d7b2438d3 68 size_t len = 0;
switches 0:5c4d7b2438d3 69
switches 0:5c4d7b2438d3 70 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->E ) );
switches 0:5c4d7b2438d3 71 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->N ) );
switches 0:5c4d7b2438d3 72
switches 0:5c4d7b2438d3 73 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
switches 0:5c4d7b2438d3 74 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
switches 0:5c4d7b2438d3 75 MBEDTLS_ASN1_SEQUENCE ) );
switches 0:5c4d7b2438d3 76
switches 0:5c4d7b2438d3 77 return( (int) len );
switches 0:5c4d7b2438d3 78 }
switches 0:5c4d7b2438d3 79 #endif /* MBEDTLS_RSA_C */
switches 0:5c4d7b2438d3 80
switches 0:5c4d7b2438d3 81 #if defined(MBEDTLS_ECP_C)
switches 0:5c4d7b2438d3 82 /*
switches 0:5c4d7b2438d3 83 * EC public key is an EC point
switches 0:5c4d7b2438d3 84 */
switches 0:5c4d7b2438d3 85 static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
switches 0:5c4d7b2438d3 86 mbedtls_ecp_keypair *ec )
switches 0:5c4d7b2438d3 87 {
switches 0:5c4d7b2438d3 88 int ret;
switches 0:5c4d7b2438d3 89 size_t len = 0;
switches 0:5c4d7b2438d3 90 unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
switches 0:5c4d7b2438d3 91
switches 0:5c4d7b2438d3 92 if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
switches 0:5c4d7b2438d3 93 MBEDTLS_ECP_PF_UNCOMPRESSED,
switches 0:5c4d7b2438d3 94 &len, buf, sizeof( buf ) ) ) != 0 )
switches 0:5c4d7b2438d3 95 {
switches 0:5c4d7b2438d3 96 return( ret );
switches 0:5c4d7b2438d3 97 }
switches 0:5c4d7b2438d3 98
switches 0:5c4d7b2438d3 99 if( *p < start || (size_t)( *p - start ) < len )
switches 0:5c4d7b2438d3 100 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
switches 0:5c4d7b2438d3 101
switches 0:5c4d7b2438d3 102 *p -= len;
switches 0:5c4d7b2438d3 103 memcpy( *p, buf, len );
switches 0:5c4d7b2438d3 104
switches 0:5c4d7b2438d3 105 return( (int) len );
switches 0:5c4d7b2438d3 106 }
switches 0:5c4d7b2438d3 107
switches 0:5c4d7b2438d3 108 /*
switches 0:5c4d7b2438d3 109 * ECParameters ::= CHOICE {
switches 0:5c4d7b2438d3 110 * namedCurve OBJECT IDENTIFIER
switches 0:5c4d7b2438d3 111 * }
switches 0:5c4d7b2438d3 112 */
switches 0:5c4d7b2438d3 113 static int pk_write_ec_param( unsigned char **p, unsigned char *start,
switches 0:5c4d7b2438d3 114 mbedtls_ecp_keypair *ec )
switches 0:5c4d7b2438d3 115 {
switches 0:5c4d7b2438d3 116 int ret;
switches 0:5c4d7b2438d3 117 size_t len = 0;
switches 0:5c4d7b2438d3 118 const char *oid;
switches 0:5c4d7b2438d3 119 size_t oid_len;
switches 0:5c4d7b2438d3 120
switches 0:5c4d7b2438d3 121 if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
switches 0:5c4d7b2438d3 122 return( ret );
switches 0:5c4d7b2438d3 123
switches 0:5c4d7b2438d3 124 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
switches 0:5c4d7b2438d3 125
switches 0:5c4d7b2438d3 126 return( (int) len );
switches 0:5c4d7b2438d3 127 }
switches 0:5c4d7b2438d3 128 #endif /* MBEDTLS_ECP_C */
switches 0:5c4d7b2438d3 129
switches 0:5c4d7b2438d3 130 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
switches 0:5c4d7b2438d3 131 const mbedtls_pk_context *key )
switches 0:5c4d7b2438d3 132 {
switches 0:5c4d7b2438d3 133 int ret;
switches 0:5c4d7b2438d3 134 size_t len = 0;
switches 0:5c4d7b2438d3 135
switches 0:5c4d7b2438d3 136 #if defined(MBEDTLS_RSA_C)
switches 0:5c4d7b2438d3 137 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
switches 0:5c4d7b2438d3 138 MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
switches 0:5c4d7b2438d3 139 else
switches 0:5c4d7b2438d3 140 #endif
switches 0:5c4d7b2438d3 141 #if defined(MBEDTLS_ECP_C)
switches 0:5c4d7b2438d3 142 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
switches 0:5c4d7b2438d3 143 MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
switches 0:5c4d7b2438d3 144 else
switches 0:5c4d7b2438d3 145 #endif
switches 0:5c4d7b2438d3 146 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 147
switches 0:5c4d7b2438d3 148 return( (int) len );
switches 0:5c4d7b2438d3 149 }
switches 0:5c4d7b2438d3 150
switches 0:5c4d7b2438d3 151 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
switches 0:5c4d7b2438d3 152 {
switches 0:5c4d7b2438d3 153 int ret;
switches 0:5c4d7b2438d3 154 unsigned char *c;
switches 0:5c4d7b2438d3 155 size_t len = 0, par_len = 0, oid_len;
switches 0:5c4d7b2438d3 156 const char *oid;
switches 0:5c4d7b2438d3 157
switches 0:5c4d7b2438d3 158 c = buf + size;
switches 0:5c4d7b2438d3 159
switches 0:5c4d7b2438d3 160 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
switches 0:5c4d7b2438d3 161
switches 0:5c4d7b2438d3 162 if( c - buf < 1 )
switches 0:5c4d7b2438d3 163 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
switches 0:5c4d7b2438d3 164
switches 0:5c4d7b2438d3 165 /*
switches 0:5c4d7b2438d3 166 * SubjectPublicKeyInfo ::= SEQUENCE {
switches 0:5c4d7b2438d3 167 * algorithm AlgorithmIdentifier,
switches 0:5c4d7b2438d3 168 * subjectPublicKey BIT STRING }
switches 0:5c4d7b2438d3 169 */
switches 0:5c4d7b2438d3 170 *--c = 0;
switches 0:5c4d7b2438d3 171 len += 1;
switches 0:5c4d7b2438d3 172
switches 0:5c4d7b2438d3 173 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
switches 0:5c4d7b2438d3 174 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
switches 0:5c4d7b2438d3 175
switches 0:5c4d7b2438d3 176 if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
switches 0:5c4d7b2438d3 177 &oid, &oid_len ) ) != 0 )
switches 0:5c4d7b2438d3 178 {
switches 0:5c4d7b2438d3 179 return( ret );
switches 0:5c4d7b2438d3 180 }
switches 0:5c4d7b2438d3 181
switches 0:5c4d7b2438d3 182 #if defined(MBEDTLS_ECP_C)
switches 0:5c4d7b2438d3 183 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
switches 0:5c4d7b2438d3 184 {
switches 0:5c4d7b2438d3 185 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
switches 0:5c4d7b2438d3 186 }
switches 0:5c4d7b2438d3 187 #endif
switches 0:5c4d7b2438d3 188
switches 0:5c4d7b2438d3 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
switches 0:5c4d7b2438d3 190 par_len ) );
switches 0:5c4d7b2438d3 191
switches 0:5c4d7b2438d3 192 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
switches 0:5c4d7b2438d3 193 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
switches 0:5c4d7b2438d3 194 MBEDTLS_ASN1_SEQUENCE ) );
switches 0:5c4d7b2438d3 195
switches 0:5c4d7b2438d3 196 return( (int) len );
switches 0:5c4d7b2438d3 197 }
switches 0:5c4d7b2438d3 198
switches 0:5c4d7b2438d3 199 int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
switches 0:5c4d7b2438d3 200 {
switches 0:5c4d7b2438d3 201 int ret;
switches 0:5c4d7b2438d3 202 unsigned char *c = buf + size;
switches 0:5c4d7b2438d3 203 size_t len = 0;
switches 0:5c4d7b2438d3 204
switches 0:5c4d7b2438d3 205 #if defined(MBEDTLS_RSA_C)
switches 0:5c4d7b2438d3 206 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
switches 0:5c4d7b2438d3 207 {
switches 0:5c4d7b2438d3 208 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
switches 0:5c4d7b2438d3 209
switches 0:5c4d7b2438d3 210 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->QP ) );
switches 0:5c4d7b2438d3 211 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DQ ) );
switches 0:5c4d7b2438d3 212 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DP ) );
switches 0:5c4d7b2438d3 213 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->Q ) );
switches 0:5c4d7b2438d3 214 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->P ) );
switches 0:5c4d7b2438d3 215 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->D ) );
switches 0:5c4d7b2438d3 216 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->E ) );
switches 0:5c4d7b2438d3 217 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->N ) );
switches 0:5c4d7b2438d3 218 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
switches 0:5c4d7b2438d3 219
switches 0:5c4d7b2438d3 220 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
switches 0:5c4d7b2438d3 221 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
switches 0:5c4d7b2438d3 222 MBEDTLS_ASN1_SEQUENCE ) );
switches 0:5c4d7b2438d3 223 }
switches 0:5c4d7b2438d3 224 else
switches 0:5c4d7b2438d3 225 #endif /* MBEDTLS_RSA_C */
switches 0:5c4d7b2438d3 226 #if defined(MBEDTLS_ECP_C)
switches 0:5c4d7b2438d3 227 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
switches 0:5c4d7b2438d3 228 {
switches 0:5c4d7b2438d3 229 mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
switches 0:5c4d7b2438d3 230 size_t pub_len = 0, par_len = 0;
switches 0:5c4d7b2438d3 231
switches 0:5c4d7b2438d3 232 /*
switches 0:5c4d7b2438d3 233 * RFC 5915, or SEC1 Appendix C.4
switches 0:5c4d7b2438d3 234 *
switches 0:5c4d7b2438d3 235 * ECPrivateKey ::= SEQUENCE {
switches 0:5c4d7b2438d3 236 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
switches 0:5c4d7b2438d3 237 * privateKey OCTET STRING,
switches 0:5c4d7b2438d3 238 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
switches 0:5c4d7b2438d3 239 * publicKey [1] BIT STRING OPTIONAL
switches 0:5c4d7b2438d3 240 * }
switches 0:5c4d7b2438d3 241 */
switches 0:5c4d7b2438d3 242
switches 0:5c4d7b2438d3 243 /* publicKey */
switches 0:5c4d7b2438d3 244 MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
switches 0:5c4d7b2438d3 245
switches 0:5c4d7b2438d3 246 if( c - buf < 1 )
switches 0:5c4d7b2438d3 247 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
switches 0:5c4d7b2438d3 248 *--c = 0;
switches 0:5c4d7b2438d3 249 pub_len += 1;
switches 0:5c4d7b2438d3 250
switches 0:5c4d7b2438d3 251 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
switches 0:5c4d7b2438d3 252 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
switches 0:5c4d7b2438d3 253
switches 0:5c4d7b2438d3 254 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
switches 0:5c4d7b2438d3 255 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
switches 0:5c4d7b2438d3 256 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
switches 0:5c4d7b2438d3 257 len += pub_len;
switches 0:5c4d7b2438d3 258
switches 0:5c4d7b2438d3 259 /* parameters */
switches 0:5c4d7b2438d3 260 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
switches 0:5c4d7b2438d3 261
switches 0:5c4d7b2438d3 262 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
switches 0:5c4d7b2438d3 263 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
switches 0:5c4d7b2438d3 264 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
switches 0:5c4d7b2438d3 265 len += par_len;
switches 0:5c4d7b2438d3 266
switches 0:5c4d7b2438d3 267 /* privateKey: write as MPI then fix tag */
switches 0:5c4d7b2438d3 268 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
switches 0:5c4d7b2438d3 269 *c = MBEDTLS_ASN1_OCTET_STRING;
switches 0:5c4d7b2438d3 270
switches 0:5c4d7b2438d3 271 /* version */
switches 0:5c4d7b2438d3 272 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
switches 0:5c4d7b2438d3 273
switches 0:5c4d7b2438d3 274 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
switches 0:5c4d7b2438d3 275 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
switches 0:5c4d7b2438d3 276 MBEDTLS_ASN1_SEQUENCE ) );
switches 0:5c4d7b2438d3 277 }
switches 0:5c4d7b2438d3 278 else
switches 0:5c4d7b2438d3 279 #endif /* MBEDTLS_ECP_C */
switches 0:5c4d7b2438d3 280 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 281
switches 0:5c4d7b2438d3 282 return( (int) len );
switches 0:5c4d7b2438d3 283 }
switches 0:5c4d7b2438d3 284
switches 0:5c4d7b2438d3 285 #if defined(MBEDTLS_PEM_WRITE_C)
switches 0:5c4d7b2438d3 286
switches 0:5c4d7b2438d3 287 #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
switches 0:5c4d7b2438d3 288 #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
switches 0:5c4d7b2438d3 289
switches 0:5c4d7b2438d3 290 #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
switches 0:5c4d7b2438d3 291 #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
switches 0:5c4d7b2438d3 292 #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
switches 0:5c4d7b2438d3 293 #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
switches 0:5c4d7b2438d3 294
switches 0:5c4d7b2438d3 295 /*
switches 0:5c4d7b2438d3 296 * Max sizes of key per types. Shown as tag + len (+ content).
switches 0:5c4d7b2438d3 297 */
switches 0:5c4d7b2438d3 298
switches 0:5c4d7b2438d3 299 #if defined(MBEDTLS_RSA_C)
switches 0:5c4d7b2438d3 300 /*
switches 0:5c4d7b2438d3 301 * RSA public keys:
switches 0:5c4d7b2438d3 302 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
switches 0:5c4d7b2438d3 303 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
switches 0:5c4d7b2438d3 304 * + 1 + 1 + 9 (rsa oid)
switches 0:5c4d7b2438d3 305 * + 1 + 1 (params null)
switches 0:5c4d7b2438d3 306 * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
switches 0:5c4d7b2438d3 307 * RSAPublicKey ::= SEQUENCE { 1 + 3
switches 0:5c4d7b2438d3 308 * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
switches 0:5c4d7b2438d3 309 * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
switches 0:5c4d7b2438d3 310 * }
switches 0:5c4d7b2438d3 311 */
switches 0:5c4d7b2438d3 312 #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
switches 0:5c4d7b2438d3 313
switches 0:5c4d7b2438d3 314 /*
switches 0:5c4d7b2438d3 315 * RSA private keys:
switches 0:5c4d7b2438d3 316 * RSAPrivateKey ::= SEQUENCE { 1 + 3
switches 0:5c4d7b2438d3 317 * version Version, 1 + 1 + 1
switches 0:5c4d7b2438d3 318 * modulus INTEGER, 1 + 3 + MPI_MAX + 1
switches 0:5c4d7b2438d3 319 * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
switches 0:5c4d7b2438d3 320 * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
switches 0:5c4d7b2438d3 321 * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
switches 0:5c4d7b2438d3 322 * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
switches 0:5c4d7b2438d3 323 * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
switches 0:5c4d7b2438d3 324 * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
switches 0:5c4d7b2438d3 325 * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
switches 0:5c4d7b2438d3 326 * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
switches 0:5c4d7b2438d3 327 * }
switches 0:5c4d7b2438d3 328 */
switches 0:5c4d7b2438d3 329 #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
switches 0:5c4d7b2438d3 330 MBEDTLS_MPI_MAX_SIZE % 2
switches 0:5c4d7b2438d3 331 #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
switches 0:5c4d7b2438d3 332 + 5 * MPI_MAX_SIZE_2
switches 0:5c4d7b2438d3 333
switches 0:5c4d7b2438d3 334 #else /* MBEDTLS_RSA_C */
switches 0:5c4d7b2438d3 335
switches 0:5c4d7b2438d3 336 #define RSA_PUB_DER_MAX_BYTES 0
switches 0:5c4d7b2438d3 337 #define RSA_PRV_DER_MAX_BYTES 0
switches 0:5c4d7b2438d3 338
switches 0:5c4d7b2438d3 339 #endif /* MBEDTLS_RSA_C */
switches 0:5c4d7b2438d3 340
switches 0:5c4d7b2438d3 341 #if defined(MBEDTLS_ECP_C)
switches 0:5c4d7b2438d3 342 /*
switches 0:5c4d7b2438d3 343 * EC public keys:
switches 0:5c4d7b2438d3 344 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
switches 0:5c4d7b2438d3 345 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
switches 0:5c4d7b2438d3 346 * + 1 + 1 + 7 (ec oid)
switches 0:5c4d7b2438d3 347 * + 1 + 1 + 9 (namedCurve oid)
switches 0:5c4d7b2438d3 348 * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
switches 0:5c4d7b2438d3 349 * + 1 (point format) [1]
switches 0:5c4d7b2438d3 350 * + 2 * ECP_MAX (coords) [1]
switches 0:5c4d7b2438d3 351 * }
switches 0:5c4d7b2438d3 352 */
switches 0:5c4d7b2438d3 353 #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
switches 0:5c4d7b2438d3 354
switches 0:5c4d7b2438d3 355 /*
switches 0:5c4d7b2438d3 356 * EC private keys:
switches 0:5c4d7b2438d3 357 * ECPrivateKey ::= SEQUENCE { 1 + 2
switches 0:5c4d7b2438d3 358 * version INTEGER , 1 + 1 + 1
switches 0:5c4d7b2438d3 359 * privateKey OCTET STRING, 1 + 1 + ECP_MAX
switches 0:5c4d7b2438d3 360 * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
switches 0:5c4d7b2438d3 361 * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
switches 0:5c4d7b2438d3 362 * }
switches 0:5c4d7b2438d3 363 */
switches 0:5c4d7b2438d3 364 #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
switches 0:5c4d7b2438d3 365
switches 0:5c4d7b2438d3 366 #else /* MBEDTLS_ECP_C */
switches 0:5c4d7b2438d3 367
switches 0:5c4d7b2438d3 368 #define ECP_PUB_DER_MAX_BYTES 0
switches 0:5c4d7b2438d3 369 #define ECP_PRV_DER_MAX_BYTES 0
switches 0:5c4d7b2438d3 370
switches 0:5c4d7b2438d3 371 #endif /* MBEDTLS_ECP_C */
switches 0:5c4d7b2438d3 372
switches 0:5c4d7b2438d3 373 #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
switches 0:5c4d7b2438d3 374 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
switches 0:5c4d7b2438d3 375 #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
switches 0:5c4d7b2438d3 376 RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
switches 0:5c4d7b2438d3 377
switches 0:5c4d7b2438d3 378 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
switches 0:5c4d7b2438d3 379 {
switches 0:5c4d7b2438d3 380 int ret;
switches 0:5c4d7b2438d3 381 unsigned char output_buf[PUB_DER_MAX_BYTES];
switches 0:5c4d7b2438d3 382 size_t olen = 0;
switches 0:5c4d7b2438d3 383
switches 0:5c4d7b2438d3 384 if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
switches 0:5c4d7b2438d3 385 sizeof(output_buf) ) ) < 0 )
switches 0:5c4d7b2438d3 386 {
switches 0:5c4d7b2438d3 387 return( ret );
switches 0:5c4d7b2438d3 388 }
switches 0:5c4d7b2438d3 389
switches 0:5c4d7b2438d3 390 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
switches 0:5c4d7b2438d3 391 output_buf + sizeof(output_buf) - ret,
switches 0:5c4d7b2438d3 392 ret, buf, size, &olen ) ) != 0 )
switches 0:5c4d7b2438d3 393 {
switches 0:5c4d7b2438d3 394 return( ret );
switches 0:5c4d7b2438d3 395 }
switches 0:5c4d7b2438d3 396
switches 0:5c4d7b2438d3 397 return( 0 );
switches 0:5c4d7b2438d3 398 }
switches 0:5c4d7b2438d3 399
switches 0:5c4d7b2438d3 400 int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
switches 0:5c4d7b2438d3 401 {
switches 0:5c4d7b2438d3 402 int ret;
switches 0:5c4d7b2438d3 403 unsigned char output_buf[PRV_DER_MAX_BYTES];
switches 0:5c4d7b2438d3 404 const char *begin, *end;
switches 0:5c4d7b2438d3 405 size_t olen = 0;
switches 0:5c4d7b2438d3 406
switches 0:5c4d7b2438d3 407 if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
switches 0:5c4d7b2438d3 408 return( ret );
switches 0:5c4d7b2438d3 409
switches 0:5c4d7b2438d3 410 #if defined(MBEDTLS_RSA_C)
switches 0:5c4d7b2438d3 411 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
switches 0:5c4d7b2438d3 412 {
switches 0:5c4d7b2438d3 413 begin = PEM_BEGIN_PRIVATE_KEY_RSA;
switches 0:5c4d7b2438d3 414 end = PEM_END_PRIVATE_KEY_RSA;
switches 0:5c4d7b2438d3 415 }
switches 0:5c4d7b2438d3 416 else
switches 0:5c4d7b2438d3 417 #endif
switches 0:5c4d7b2438d3 418 #if defined(MBEDTLS_ECP_C)
switches 0:5c4d7b2438d3 419 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
switches 0:5c4d7b2438d3 420 {
switches 0:5c4d7b2438d3 421 begin = PEM_BEGIN_PRIVATE_KEY_EC;
switches 0:5c4d7b2438d3 422 end = PEM_END_PRIVATE_KEY_EC;
switches 0:5c4d7b2438d3 423 }
switches 0:5c4d7b2438d3 424 else
switches 0:5c4d7b2438d3 425 #endif
switches 0:5c4d7b2438d3 426 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
switches 0:5c4d7b2438d3 427
switches 0:5c4d7b2438d3 428 if( ( ret = mbedtls_pem_write_buffer( begin, end,
switches 0:5c4d7b2438d3 429 output_buf + sizeof(output_buf) - ret,
switches 0:5c4d7b2438d3 430 ret, buf, size, &olen ) ) != 0 )
switches 0:5c4d7b2438d3 431 {
switches 0:5c4d7b2438d3 432 return( ret );
switches 0:5c4d7b2438d3 433 }
switches 0:5c4d7b2438d3 434
switches 0:5c4d7b2438d3 435 return( 0 );
switches 0:5c4d7b2438d3 436 }
switches 0:5c4d7b2438d3 437 #endif /* MBEDTLS_PEM_WRITE_C */
switches 0:5c4d7b2438d3 438
switches 0:5c4d7b2438d3 439 #endif /* MBEDTLS_PK_WRITE_C */