erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

features/mbedtls/src/pkwrite.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /*
elessair 0:f269e3021894 2 * Public Key layer for writing key files and structures
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
elessair 0:f269e3021894 5 * SPDX-License-Identifier: Apache-2.0
elessair 0:f269e3021894 6 *
elessair 0:f269e3021894 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
elessair 0:f269e3021894 8 * not use this file except in compliance with the License.
elessair 0:f269e3021894 9 * You may obtain a copy of the License at
elessair 0:f269e3021894 10 *
elessair 0:f269e3021894 11 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 12 *
elessair 0:f269e3021894 13 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
elessair 0:f269e3021894 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 16 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 17 * limitations under the License.
elessair 0:f269e3021894 18 *
elessair 0:f269e3021894 19 * This file is part of mbed TLS (https://tls.mbed.org)
elessair 0:f269e3021894 20 */
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22 #if !defined(MBEDTLS_CONFIG_FILE)
elessair 0:f269e3021894 23 #include "mbedtls/config.h"
elessair 0:f269e3021894 24 #else
elessair 0:f269e3021894 25 #include MBEDTLS_CONFIG_FILE
elessair 0:f269e3021894 26 #endif
elessair 0:f269e3021894 27
elessair 0:f269e3021894 28 #if defined(MBEDTLS_PK_WRITE_C)
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 #include "mbedtls/pk.h"
elessair 0:f269e3021894 31 #include "mbedtls/asn1write.h"
elessair 0:f269e3021894 32 #include "mbedtls/oid.h"
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 #include <string.h>
elessair 0:f269e3021894 35
elessair 0:f269e3021894 36 #if defined(MBEDTLS_RSA_C)
elessair 0:f269e3021894 37 #include "mbedtls/rsa.h"
elessair 0:f269e3021894 38 #endif
elessair 0:f269e3021894 39 #if defined(MBEDTLS_ECP_C)
elessair 0:f269e3021894 40 #include "mbedtls/ecp.h"
elessair 0:f269e3021894 41 #endif
elessair 0:f269e3021894 42 #if defined(MBEDTLS_ECDSA_C)
elessair 0:f269e3021894 43 #include "mbedtls/ecdsa.h"
elessair 0:f269e3021894 44 #endif
elessair 0:f269e3021894 45 #if defined(MBEDTLS_PEM_WRITE_C)
elessair 0:f269e3021894 46 #include "mbedtls/pem.h"
elessair 0:f269e3021894 47 #endif
elessair 0:f269e3021894 48
elessair 0:f269e3021894 49 #if defined(MBEDTLS_PLATFORM_C)
elessair 0:f269e3021894 50 #include "mbedtls/platform.h"
elessair 0:f269e3021894 51 #else
elessair 0:f269e3021894 52 #include <stdlib.h>
elessair 0:f269e3021894 53 #define mbedtls_calloc calloc
elessair 0:f269e3021894 54 #define mbedtls_free free
elessair 0:f269e3021894 55 #endif
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 #if defined(MBEDTLS_RSA_C)
elessair 0:f269e3021894 58 /*
elessair 0:f269e3021894 59 * RSAPublicKey ::= SEQUENCE {
elessair 0:f269e3021894 60 * modulus INTEGER, -- n
elessair 0:f269e3021894 61 * publicExponent INTEGER -- e
elessair 0:f269e3021894 62 * }
elessair 0:f269e3021894 63 */
elessair 0:f269e3021894 64 static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
elessair 0:f269e3021894 65 mbedtls_rsa_context *rsa )
elessair 0:f269e3021894 66 {
elessair 0:f269e3021894 67 int ret;
elessair 0:f269e3021894 68 size_t len = 0;
elessair 0:f269e3021894 69
elessair 0:f269e3021894 70 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->E ) );
elessair 0:f269e3021894 71 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->N ) );
elessair 0:f269e3021894 72
elessair 0:f269e3021894 73 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
elessair 0:f269e3021894 74 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 75 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 76
elessair 0:f269e3021894 77 return( (int) len );
elessair 0:f269e3021894 78 }
elessair 0:f269e3021894 79 #endif /* MBEDTLS_RSA_C */
elessair 0:f269e3021894 80
elessair 0:f269e3021894 81 #if defined(MBEDTLS_ECP_C)
elessair 0:f269e3021894 82 /*
elessair 0:f269e3021894 83 * EC public key is an EC point
elessair 0:f269e3021894 84 */
elessair 0:f269e3021894 85 static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
elessair 0:f269e3021894 86 mbedtls_ecp_keypair *ec )
elessair 0:f269e3021894 87 {
elessair 0:f269e3021894 88 int ret;
elessair 0:f269e3021894 89 size_t len = 0;
elessair 0:f269e3021894 90 unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
elessair 0:f269e3021894 91
elessair 0:f269e3021894 92 if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
elessair 0:f269e3021894 93 MBEDTLS_ECP_PF_UNCOMPRESSED,
elessair 0:f269e3021894 94 &len, buf, sizeof( buf ) ) ) != 0 )
elessair 0:f269e3021894 95 {
elessair 0:f269e3021894 96 return( ret );
elessair 0:f269e3021894 97 }
elessair 0:f269e3021894 98
elessair 0:f269e3021894 99 if( *p < start || (size_t)( *p - start ) < len )
elessair 0:f269e3021894 100 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
elessair 0:f269e3021894 101
elessair 0:f269e3021894 102 *p -= len;
elessair 0:f269e3021894 103 memcpy( *p, buf, len );
elessair 0:f269e3021894 104
elessair 0:f269e3021894 105 return( (int) len );
elessair 0:f269e3021894 106 }
elessair 0:f269e3021894 107
elessair 0:f269e3021894 108 /*
elessair 0:f269e3021894 109 * ECParameters ::= CHOICE {
elessair 0:f269e3021894 110 * namedCurve OBJECT IDENTIFIER
elessair 0:f269e3021894 111 * }
elessair 0:f269e3021894 112 */
elessair 0:f269e3021894 113 static int pk_write_ec_param( unsigned char **p, unsigned char *start,
elessair 0:f269e3021894 114 mbedtls_ecp_keypair *ec )
elessair 0:f269e3021894 115 {
elessair 0:f269e3021894 116 int ret;
elessair 0:f269e3021894 117 size_t len = 0;
elessair 0:f269e3021894 118 const char *oid;
elessair 0:f269e3021894 119 size_t oid_len;
elessair 0:f269e3021894 120
elessair 0:f269e3021894 121 if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
elessair 0:f269e3021894 122 return( ret );
elessair 0:f269e3021894 123
elessair 0:f269e3021894 124 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
elessair 0:f269e3021894 125
elessair 0:f269e3021894 126 return( (int) len );
elessair 0:f269e3021894 127 }
elessair 0:f269e3021894 128 #endif /* MBEDTLS_ECP_C */
elessair 0:f269e3021894 129
elessair 0:f269e3021894 130 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
elessair 0:f269e3021894 131 const mbedtls_pk_context *key )
elessair 0:f269e3021894 132 {
elessair 0:f269e3021894 133 int ret;
elessair 0:f269e3021894 134 size_t len = 0;
elessair 0:f269e3021894 135
elessair 0:f269e3021894 136 #if defined(MBEDTLS_RSA_C)
elessair 0:f269e3021894 137 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
elessair 0:f269e3021894 138 MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
elessair 0:f269e3021894 139 else
elessair 0:f269e3021894 140 #endif
elessair 0:f269e3021894 141 #if defined(MBEDTLS_ECP_C)
elessair 0:f269e3021894 142 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
elessair 0:f269e3021894 143 MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
elessair 0:f269e3021894 144 else
elessair 0:f269e3021894 145 #endif
elessair 0:f269e3021894 146 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
elessair 0:f269e3021894 147
elessair 0:f269e3021894 148 return( (int) len );
elessair 0:f269e3021894 149 }
elessair 0:f269e3021894 150
elessair 0:f269e3021894 151 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
elessair 0:f269e3021894 152 {
elessair 0:f269e3021894 153 int ret;
elessair 0:f269e3021894 154 unsigned char *c;
elessair 0:f269e3021894 155 size_t len = 0, par_len = 0, oid_len;
elessair 0:f269e3021894 156 const char *oid;
elessair 0:f269e3021894 157
elessair 0:f269e3021894 158 c = buf + size;
elessair 0:f269e3021894 159
elessair 0:f269e3021894 160 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
elessair 0:f269e3021894 161
elessair 0:f269e3021894 162 if( c - buf < 1 )
elessair 0:f269e3021894 163 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
elessair 0:f269e3021894 164
elessair 0:f269e3021894 165 /*
elessair 0:f269e3021894 166 * SubjectPublicKeyInfo ::= SEQUENCE {
elessair 0:f269e3021894 167 * algorithm AlgorithmIdentifier,
elessair 0:f269e3021894 168 * subjectPublicKey BIT STRING }
elessair 0:f269e3021894 169 */
elessair 0:f269e3021894 170 *--c = 0;
elessair 0:f269e3021894 171 len += 1;
elessair 0:f269e3021894 172
elessair 0:f269e3021894 173 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
elessair 0:f269e3021894 174 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
elessair 0:f269e3021894 175
elessair 0:f269e3021894 176 if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
elessair 0:f269e3021894 177 &oid, &oid_len ) ) != 0 )
elessair 0:f269e3021894 178 {
elessair 0:f269e3021894 179 return( ret );
elessair 0:f269e3021894 180 }
elessair 0:f269e3021894 181
elessair 0:f269e3021894 182 #if defined(MBEDTLS_ECP_C)
elessair 0:f269e3021894 183 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
elessair 0:f269e3021894 184 {
elessair 0:f269e3021894 185 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
elessair 0:f269e3021894 186 }
elessair 0:f269e3021894 187 #endif
elessair 0:f269e3021894 188
elessair 0:f269e3021894 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
elessair 0:f269e3021894 190 par_len ) );
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
elessair 0:f269e3021894 193 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 194 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 195
elessair 0:f269e3021894 196 return( (int) len );
elessair 0:f269e3021894 197 }
elessair 0:f269e3021894 198
elessair 0:f269e3021894 199 int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
elessair 0:f269e3021894 200 {
elessair 0:f269e3021894 201 int ret;
elessair 0:f269e3021894 202 unsigned char *c = buf + size;
elessair 0:f269e3021894 203 size_t len = 0;
elessair 0:f269e3021894 204
elessair 0:f269e3021894 205 #if defined(MBEDTLS_RSA_C)
elessair 0:f269e3021894 206 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
elessair 0:f269e3021894 207 {
elessair 0:f269e3021894 208 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
elessair 0:f269e3021894 209
elessair 0:f269e3021894 210 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->QP ) );
elessair 0:f269e3021894 211 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DQ ) );
elessair 0:f269e3021894 212 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DP ) );
elessair 0:f269e3021894 213 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->Q ) );
elessair 0:f269e3021894 214 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->P ) );
elessair 0:f269e3021894 215 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->D ) );
elessair 0:f269e3021894 216 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->E ) );
elessair 0:f269e3021894 217 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->N ) );
elessair 0:f269e3021894 218 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
elessair 0:f269e3021894 219
elessair 0:f269e3021894 220 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
elessair 0:f269e3021894 221 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 222 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 223 }
elessair 0:f269e3021894 224 else
elessair 0:f269e3021894 225 #endif /* MBEDTLS_RSA_C */
elessair 0:f269e3021894 226 #if defined(MBEDTLS_ECP_C)
elessair 0:f269e3021894 227 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
elessair 0:f269e3021894 228 {
elessair 0:f269e3021894 229 mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
elessair 0:f269e3021894 230 size_t pub_len = 0, par_len = 0;
elessair 0:f269e3021894 231
elessair 0:f269e3021894 232 /*
elessair 0:f269e3021894 233 * RFC 5915, or SEC1 Appendix C.4
elessair 0:f269e3021894 234 *
elessair 0:f269e3021894 235 * ECPrivateKey ::= SEQUENCE {
elessair 0:f269e3021894 236 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
elessair 0:f269e3021894 237 * privateKey OCTET STRING,
elessair 0:f269e3021894 238 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
elessair 0:f269e3021894 239 * publicKey [1] BIT STRING OPTIONAL
elessair 0:f269e3021894 240 * }
elessair 0:f269e3021894 241 */
elessair 0:f269e3021894 242
elessair 0:f269e3021894 243 /* publicKey */
elessair 0:f269e3021894 244 MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
elessair 0:f269e3021894 245
elessair 0:f269e3021894 246 if( c - buf < 1 )
elessair 0:f269e3021894 247 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
elessair 0:f269e3021894 248 *--c = 0;
elessair 0:f269e3021894 249 pub_len += 1;
elessair 0:f269e3021894 250
elessair 0:f269e3021894 251 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
elessair 0:f269e3021894 252 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
elessair 0:f269e3021894 253
elessair 0:f269e3021894 254 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
elessair 0:f269e3021894 255 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
elessair 0:f269e3021894 256 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
elessair 0:f269e3021894 257 len += pub_len;
elessair 0:f269e3021894 258
elessair 0:f269e3021894 259 /* parameters */
elessair 0:f269e3021894 260 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
elessair 0:f269e3021894 261
elessair 0:f269e3021894 262 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
elessair 0:f269e3021894 263 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
elessair 0:f269e3021894 264 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
elessair 0:f269e3021894 265 len += par_len;
elessair 0:f269e3021894 266
elessair 0:f269e3021894 267 /* privateKey: write as MPI then fix tag */
elessair 0:f269e3021894 268 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
elessair 0:f269e3021894 269 *c = MBEDTLS_ASN1_OCTET_STRING;
elessair 0:f269e3021894 270
elessair 0:f269e3021894 271 /* version */
elessair 0:f269e3021894 272 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
elessair 0:f269e3021894 273
elessair 0:f269e3021894 274 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
elessair 0:f269e3021894 275 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 276 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 277 }
elessair 0:f269e3021894 278 else
elessair 0:f269e3021894 279 #endif /* MBEDTLS_ECP_C */
elessair 0:f269e3021894 280 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
elessair 0:f269e3021894 281
elessair 0:f269e3021894 282 return( (int) len );
elessair 0:f269e3021894 283 }
elessair 0:f269e3021894 284
elessair 0:f269e3021894 285 #if defined(MBEDTLS_PEM_WRITE_C)
elessair 0:f269e3021894 286
elessair 0:f269e3021894 287 #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
elessair 0:f269e3021894 288 #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
elessair 0:f269e3021894 289
elessair 0:f269e3021894 290 #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
elessair 0:f269e3021894 291 #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
elessair 0:f269e3021894 292 #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
elessair 0:f269e3021894 293 #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
elessair 0:f269e3021894 294
elessair 0:f269e3021894 295 /*
elessair 0:f269e3021894 296 * Max sizes of key per types. Shown as tag + len (+ content).
elessair 0:f269e3021894 297 */
elessair 0:f269e3021894 298
elessair 0:f269e3021894 299 #if defined(MBEDTLS_RSA_C)
elessair 0:f269e3021894 300 /*
elessair 0:f269e3021894 301 * RSA public keys:
elessair 0:f269e3021894 302 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
elessair 0:f269e3021894 303 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
elessair 0:f269e3021894 304 * + 1 + 1 + 9 (rsa oid)
elessair 0:f269e3021894 305 * + 1 + 1 (params null)
elessair 0:f269e3021894 306 * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
elessair 0:f269e3021894 307 * RSAPublicKey ::= SEQUENCE { 1 + 3
elessair 0:f269e3021894 308 * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
elessair 0:f269e3021894 309 * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
elessair 0:f269e3021894 310 * }
elessair 0:f269e3021894 311 */
elessair 0:f269e3021894 312 #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
elessair 0:f269e3021894 313
elessair 0:f269e3021894 314 /*
elessair 0:f269e3021894 315 * RSA private keys:
elessair 0:f269e3021894 316 * RSAPrivateKey ::= SEQUENCE { 1 + 3
elessair 0:f269e3021894 317 * version Version, 1 + 1 + 1
elessair 0:f269e3021894 318 * modulus INTEGER, 1 + 3 + MPI_MAX + 1
elessair 0:f269e3021894 319 * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
elessair 0:f269e3021894 320 * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
elessair 0:f269e3021894 321 * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
elessair 0:f269e3021894 322 * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
elessair 0:f269e3021894 323 * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
elessair 0:f269e3021894 324 * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
elessair 0:f269e3021894 325 * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
elessair 0:f269e3021894 326 * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
elessair 0:f269e3021894 327 * }
elessair 0:f269e3021894 328 */
elessair 0:f269e3021894 329 #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
elessair 0:f269e3021894 330 MBEDTLS_MPI_MAX_SIZE % 2
elessair 0:f269e3021894 331 #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
elessair 0:f269e3021894 332 + 5 * MPI_MAX_SIZE_2
elessair 0:f269e3021894 333
elessair 0:f269e3021894 334 #else /* MBEDTLS_RSA_C */
elessair 0:f269e3021894 335
elessair 0:f269e3021894 336 #define RSA_PUB_DER_MAX_BYTES 0
elessair 0:f269e3021894 337 #define RSA_PRV_DER_MAX_BYTES 0
elessair 0:f269e3021894 338
elessair 0:f269e3021894 339 #endif /* MBEDTLS_RSA_C */
elessair 0:f269e3021894 340
elessair 0:f269e3021894 341 #if defined(MBEDTLS_ECP_C)
elessair 0:f269e3021894 342 /*
elessair 0:f269e3021894 343 * EC public keys:
elessair 0:f269e3021894 344 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
elessair 0:f269e3021894 345 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
elessair 0:f269e3021894 346 * + 1 + 1 + 7 (ec oid)
elessair 0:f269e3021894 347 * + 1 + 1 + 9 (namedCurve oid)
elessair 0:f269e3021894 348 * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
elessair 0:f269e3021894 349 * + 1 (point format) [1]
elessair 0:f269e3021894 350 * + 2 * ECP_MAX (coords) [1]
elessair 0:f269e3021894 351 * }
elessair 0:f269e3021894 352 */
elessair 0:f269e3021894 353 #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
elessair 0:f269e3021894 354
elessair 0:f269e3021894 355 /*
elessair 0:f269e3021894 356 * EC private keys:
elessair 0:f269e3021894 357 * ECPrivateKey ::= SEQUENCE { 1 + 2
elessair 0:f269e3021894 358 * version INTEGER , 1 + 1 + 1
elessair 0:f269e3021894 359 * privateKey OCTET STRING, 1 + 1 + ECP_MAX
elessair 0:f269e3021894 360 * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
elessair 0:f269e3021894 361 * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
elessair 0:f269e3021894 362 * }
elessair 0:f269e3021894 363 */
elessair 0:f269e3021894 364 #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
elessair 0:f269e3021894 365
elessair 0:f269e3021894 366 #else /* MBEDTLS_ECP_C */
elessair 0:f269e3021894 367
elessair 0:f269e3021894 368 #define ECP_PUB_DER_MAX_BYTES 0
elessair 0:f269e3021894 369 #define ECP_PRV_DER_MAX_BYTES 0
elessair 0:f269e3021894 370
elessair 0:f269e3021894 371 #endif /* MBEDTLS_ECP_C */
elessair 0:f269e3021894 372
elessair 0:f269e3021894 373 #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
elessair 0:f269e3021894 374 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
elessair 0:f269e3021894 375 #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
elessair 0:f269e3021894 376 RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
elessair 0:f269e3021894 377
elessair 0:f269e3021894 378 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
elessair 0:f269e3021894 379 {
elessair 0:f269e3021894 380 int ret;
elessair 0:f269e3021894 381 unsigned char output_buf[PUB_DER_MAX_BYTES];
elessair 0:f269e3021894 382 size_t olen = 0;
elessair 0:f269e3021894 383
elessair 0:f269e3021894 384 if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
elessair 0:f269e3021894 385 sizeof(output_buf) ) ) < 0 )
elessair 0:f269e3021894 386 {
elessair 0:f269e3021894 387 return( ret );
elessair 0:f269e3021894 388 }
elessair 0:f269e3021894 389
elessair 0:f269e3021894 390 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
elessair 0:f269e3021894 391 output_buf + sizeof(output_buf) - ret,
elessair 0:f269e3021894 392 ret, buf, size, &olen ) ) != 0 )
elessair 0:f269e3021894 393 {
elessair 0:f269e3021894 394 return( ret );
elessair 0:f269e3021894 395 }
elessair 0:f269e3021894 396
elessair 0:f269e3021894 397 return( 0 );
elessair 0:f269e3021894 398 }
elessair 0:f269e3021894 399
elessair 0:f269e3021894 400 int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
elessair 0:f269e3021894 401 {
elessair 0:f269e3021894 402 int ret;
elessair 0:f269e3021894 403 unsigned char output_buf[PRV_DER_MAX_BYTES];
elessair 0:f269e3021894 404 const char *begin, *end;
elessair 0:f269e3021894 405 size_t olen = 0;
elessair 0:f269e3021894 406
elessair 0:f269e3021894 407 if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
elessair 0:f269e3021894 408 return( ret );
elessair 0:f269e3021894 409
elessair 0:f269e3021894 410 #if defined(MBEDTLS_RSA_C)
elessair 0:f269e3021894 411 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
elessair 0:f269e3021894 412 {
elessair 0:f269e3021894 413 begin = PEM_BEGIN_PRIVATE_KEY_RSA;
elessair 0:f269e3021894 414 end = PEM_END_PRIVATE_KEY_RSA;
elessair 0:f269e3021894 415 }
elessair 0:f269e3021894 416 else
elessair 0:f269e3021894 417 #endif
elessair 0:f269e3021894 418 #if defined(MBEDTLS_ECP_C)
elessair 0:f269e3021894 419 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
elessair 0:f269e3021894 420 {
elessair 0:f269e3021894 421 begin = PEM_BEGIN_PRIVATE_KEY_EC;
elessair 0:f269e3021894 422 end = PEM_END_PRIVATE_KEY_EC;
elessair 0:f269e3021894 423 }
elessair 0:f269e3021894 424 else
elessair 0:f269e3021894 425 #endif
elessair 0:f269e3021894 426 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
elessair 0:f269e3021894 427
elessair 0:f269e3021894 428 if( ( ret = mbedtls_pem_write_buffer( begin, end,
elessair 0:f269e3021894 429 output_buf + sizeof(output_buf) - ret,
elessair 0:f269e3021894 430 ret, buf, size, &olen ) ) != 0 )
elessair 0:f269e3021894 431 {
elessair 0:f269e3021894 432 return( ret );
elessair 0:f269e3021894 433 }
elessair 0:f269e3021894 434
elessair 0:f269e3021894 435 return( 0 );
elessair 0:f269e3021894 436 }
elessair 0:f269e3021894 437 #endif /* MBEDTLS_PEM_WRITE_C */
elessair 0:f269e3021894 438
elessair 0:f269e3021894 439 #endif /* MBEDTLS_PK_WRITE_C */