Nicolas Borla / Mbed OS BBR_1Ebene

BBR 1 Ebene

mbed-os/features/mbedtls/src/pkwrite.c@0:fbdae7e6d805, 2018-05-14 (annotated)

Committer:
borlanic
Date:
Mon May 14 11:29:06 2018 +0000
Revision:
0:fbdae7e6d805
BBR

Who changed what in which revision?

UserRevisionLine numberNew contents of line
borlanic 0:fbdae7e6d805 1 /*
borlanic 0:fbdae7e6d805 2 * Public Key layer for writing key files and structures
borlanic 0:fbdae7e6d805 3 *
borlanic 0:fbdae7e6d805 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
borlanic 0:fbdae7e6d805 5 * SPDX-License-Identifier: Apache-2.0
borlanic 0:fbdae7e6d805 6 *
borlanic 0:fbdae7e6d805 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
borlanic 0:fbdae7e6d805 8 * not use this file except in compliance with the License.
borlanic 0:fbdae7e6d805 9 * You may obtain a copy of the License at
borlanic 0:fbdae7e6d805 10 *
borlanic 0:fbdae7e6d805 11 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:fbdae7e6d805 12 *
borlanic 0:fbdae7e6d805 13 * Unless required by applicable law or agreed to in writing, software
borlanic 0:fbdae7e6d805 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
borlanic 0:fbdae7e6d805 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:fbdae7e6d805 16 * See the License for the specific language governing permissions and
borlanic 0:fbdae7e6d805 17 * limitations under the License.
borlanic 0:fbdae7e6d805 18 *
borlanic 0:fbdae7e6d805 19 * This file is part of mbed TLS (https://tls.mbed.org)
borlanic 0:fbdae7e6d805 20 */
borlanic 0:fbdae7e6d805 21
borlanic 0:fbdae7e6d805 22 #if !defined(MBEDTLS_CONFIG_FILE)
borlanic 0:fbdae7e6d805 23 #include "mbedtls/config.h"
borlanic 0:fbdae7e6d805 24 #else
borlanic 0:fbdae7e6d805 25 #include MBEDTLS_CONFIG_FILE
borlanic 0:fbdae7e6d805 26 #endif
borlanic 0:fbdae7e6d805 27
borlanic 0:fbdae7e6d805 28 #if defined(MBEDTLS_PK_WRITE_C)
borlanic 0:fbdae7e6d805 29
borlanic 0:fbdae7e6d805 30 #include "mbedtls/pk.h"
borlanic 0:fbdae7e6d805 31 #include "mbedtls/asn1write.h"
borlanic 0:fbdae7e6d805 32 #include "mbedtls/oid.h"
borlanic 0:fbdae7e6d805 33
borlanic 0:fbdae7e6d805 34 #include <string.h>
borlanic 0:fbdae7e6d805 35
borlanic 0:fbdae7e6d805 36 #if defined(MBEDTLS_RSA_C)
borlanic 0:fbdae7e6d805 37 #include "mbedtls/rsa.h"
borlanic 0:fbdae7e6d805 38 #endif
borlanic 0:fbdae7e6d805 39 #if defined(MBEDTLS_ECP_C)
borlanic 0:fbdae7e6d805 40 #include "mbedtls/ecp.h"
borlanic 0:fbdae7e6d805 41 #endif
borlanic 0:fbdae7e6d805 42 #if defined(MBEDTLS_ECDSA_C)
borlanic 0:fbdae7e6d805 43 #include "mbedtls/ecdsa.h"
borlanic 0:fbdae7e6d805 44 #endif
borlanic 0:fbdae7e6d805 45 #if defined(MBEDTLS_PEM_WRITE_C)
borlanic 0:fbdae7e6d805 46 #include "mbedtls/pem.h"
borlanic 0:fbdae7e6d805 47 #endif
borlanic 0:fbdae7e6d805 48
borlanic 0:fbdae7e6d805 49 #if defined(MBEDTLS_PLATFORM_C)
borlanic 0:fbdae7e6d805 50 #include "mbedtls/platform.h"
borlanic 0:fbdae7e6d805 51 #else
borlanic 0:fbdae7e6d805 52 #include <stdlib.h>
borlanic 0:fbdae7e6d805 53 #define mbedtls_calloc calloc
borlanic 0:fbdae7e6d805 54 #define mbedtls_free free
borlanic 0:fbdae7e6d805 55 #endif
borlanic 0:fbdae7e6d805 56
borlanic 0:fbdae7e6d805 57 #if defined(MBEDTLS_RSA_C)
borlanic 0:fbdae7e6d805 58 /*
borlanic 0:fbdae7e6d805 59 * RSAPublicKey ::= SEQUENCE {
borlanic 0:fbdae7e6d805 60 * modulus INTEGER, -- n
borlanic 0:fbdae7e6d805 61 * publicExponent INTEGER -- e
borlanic 0:fbdae7e6d805 62 * }
borlanic 0:fbdae7e6d805 63 */
borlanic 0:fbdae7e6d805 64 static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
borlanic 0:fbdae7e6d805 65 mbedtls_rsa_context *rsa )
borlanic 0:fbdae7e6d805 66 {
borlanic 0:fbdae7e6d805 67 int ret;
borlanic 0:fbdae7e6d805 68 size_t len = 0;
borlanic 0:fbdae7e6d805 69 mbedtls_mpi T;
borlanic 0:fbdae7e6d805 70
borlanic 0:fbdae7e6d805 71 mbedtls_mpi_init( &T );
borlanic 0:fbdae7e6d805 72
borlanic 0:fbdae7e6d805 73 /* Export E */
borlanic 0:fbdae7e6d805 74 if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &T ) ) != 0 ||
borlanic 0:fbdae7e6d805 75 ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 76 goto end_of_export;
borlanic 0:fbdae7e6d805 77 len += ret;
borlanic 0:fbdae7e6d805 78
borlanic 0:fbdae7e6d805 79 /* Export N */
borlanic 0:fbdae7e6d805 80 if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, NULL, NULL, NULL ) ) != 0 ||
borlanic 0:fbdae7e6d805 81 ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 82 goto end_of_export;
borlanic 0:fbdae7e6d805 83 len += ret;
borlanic 0:fbdae7e6d805 84
borlanic 0:fbdae7e6d805 85 end_of_export:
borlanic 0:fbdae7e6d805 86
borlanic 0:fbdae7e6d805 87 mbedtls_mpi_free( &T );
borlanic 0:fbdae7e6d805 88 if( ret < 0 )
borlanic 0:fbdae7e6d805 89 return( ret );
borlanic 0:fbdae7e6d805 90
borlanic 0:fbdae7e6d805 91 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
borlanic 0:fbdae7e6d805 92 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
borlanic 0:fbdae7e6d805 93 MBEDTLS_ASN1_SEQUENCE ) );
borlanic 0:fbdae7e6d805 94
borlanic 0:fbdae7e6d805 95 return( (int) len );
borlanic 0:fbdae7e6d805 96 }
borlanic 0:fbdae7e6d805 97 #endif /* MBEDTLS_RSA_C */
borlanic 0:fbdae7e6d805 98
borlanic 0:fbdae7e6d805 99 #if defined(MBEDTLS_ECP_C)
borlanic 0:fbdae7e6d805 100 /*
borlanic 0:fbdae7e6d805 101 * EC public key is an EC point
borlanic 0:fbdae7e6d805 102 */
borlanic 0:fbdae7e6d805 103 static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
borlanic 0:fbdae7e6d805 104 mbedtls_ecp_keypair *ec )
borlanic 0:fbdae7e6d805 105 {
borlanic 0:fbdae7e6d805 106 int ret;
borlanic 0:fbdae7e6d805 107 size_t len = 0;
borlanic 0:fbdae7e6d805 108 unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
borlanic 0:fbdae7e6d805 109
borlanic 0:fbdae7e6d805 110 if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
borlanic 0:fbdae7e6d805 111 MBEDTLS_ECP_PF_UNCOMPRESSED,
borlanic 0:fbdae7e6d805 112 &len, buf, sizeof( buf ) ) ) != 0 )
borlanic 0:fbdae7e6d805 113 {
borlanic 0:fbdae7e6d805 114 return( ret );
borlanic 0:fbdae7e6d805 115 }
borlanic 0:fbdae7e6d805 116
borlanic 0:fbdae7e6d805 117 if( *p < start || (size_t)( *p - start ) < len )
borlanic 0:fbdae7e6d805 118 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
borlanic 0:fbdae7e6d805 119
borlanic 0:fbdae7e6d805 120 *p -= len;
borlanic 0:fbdae7e6d805 121 memcpy( *p, buf, len );
borlanic 0:fbdae7e6d805 122
borlanic 0:fbdae7e6d805 123 return( (int) len );
borlanic 0:fbdae7e6d805 124 }
borlanic 0:fbdae7e6d805 125
borlanic 0:fbdae7e6d805 126 /*
borlanic 0:fbdae7e6d805 127 * ECParameters ::= CHOICE {
borlanic 0:fbdae7e6d805 128 * namedCurve OBJECT IDENTIFIER
borlanic 0:fbdae7e6d805 129 * }
borlanic 0:fbdae7e6d805 130 */
borlanic 0:fbdae7e6d805 131 static int pk_write_ec_param( unsigned char **p, unsigned char *start,
borlanic 0:fbdae7e6d805 132 mbedtls_ecp_keypair *ec )
borlanic 0:fbdae7e6d805 133 {
borlanic 0:fbdae7e6d805 134 int ret;
borlanic 0:fbdae7e6d805 135 size_t len = 0;
borlanic 0:fbdae7e6d805 136 const char *oid;
borlanic 0:fbdae7e6d805 137 size_t oid_len;
borlanic 0:fbdae7e6d805 138
borlanic 0:fbdae7e6d805 139 if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
borlanic 0:fbdae7e6d805 140 return( ret );
borlanic 0:fbdae7e6d805 141
borlanic 0:fbdae7e6d805 142 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
borlanic 0:fbdae7e6d805 143
borlanic 0:fbdae7e6d805 144 return( (int) len );
borlanic 0:fbdae7e6d805 145 }
borlanic 0:fbdae7e6d805 146 #endif /* MBEDTLS_ECP_C */
borlanic 0:fbdae7e6d805 147
borlanic 0:fbdae7e6d805 148 int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
borlanic 0:fbdae7e6d805 149 const mbedtls_pk_context *key )
borlanic 0:fbdae7e6d805 150 {
borlanic 0:fbdae7e6d805 151 int ret;
borlanic 0:fbdae7e6d805 152 size_t len = 0;
borlanic 0:fbdae7e6d805 153
borlanic 0:fbdae7e6d805 154 #if defined(MBEDTLS_RSA_C)
borlanic 0:fbdae7e6d805 155 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
borlanic 0:fbdae7e6d805 156 MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
borlanic 0:fbdae7e6d805 157 else
borlanic 0:fbdae7e6d805 158 #endif
borlanic 0:fbdae7e6d805 159 #if defined(MBEDTLS_ECP_C)
borlanic 0:fbdae7e6d805 160 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
borlanic 0:fbdae7e6d805 161 MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
borlanic 0:fbdae7e6d805 162 else
borlanic 0:fbdae7e6d805 163 #endif
borlanic 0:fbdae7e6d805 164 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
borlanic 0:fbdae7e6d805 165
borlanic 0:fbdae7e6d805 166 return( (int) len );
borlanic 0:fbdae7e6d805 167 }
borlanic 0:fbdae7e6d805 168
borlanic 0:fbdae7e6d805 169 int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
borlanic 0:fbdae7e6d805 170 {
borlanic 0:fbdae7e6d805 171 int ret;
borlanic 0:fbdae7e6d805 172 unsigned char *c;
borlanic 0:fbdae7e6d805 173 size_t len = 0, par_len = 0, oid_len;
borlanic 0:fbdae7e6d805 174 const char *oid;
borlanic 0:fbdae7e6d805 175
borlanic 0:fbdae7e6d805 176 c = buf + size;
borlanic 0:fbdae7e6d805 177
borlanic 0:fbdae7e6d805 178 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
borlanic 0:fbdae7e6d805 179
borlanic 0:fbdae7e6d805 180 if( c - buf < 1 )
borlanic 0:fbdae7e6d805 181 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
borlanic 0:fbdae7e6d805 182
borlanic 0:fbdae7e6d805 183 /*
borlanic 0:fbdae7e6d805 184 * SubjectPublicKeyInfo ::= SEQUENCE {
borlanic 0:fbdae7e6d805 185 * algorithm AlgorithmIdentifier,
borlanic 0:fbdae7e6d805 186 * subjectPublicKey BIT STRING }
borlanic 0:fbdae7e6d805 187 */
borlanic 0:fbdae7e6d805 188 *--c = 0;
borlanic 0:fbdae7e6d805 189 len += 1;
borlanic 0:fbdae7e6d805 190
borlanic 0:fbdae7e6d805 191 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
borlanic 0:fbdae7e6d805 192 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
borlanic 0:fbdae7e6d805 193
borlanic 0:fbdae7e6d805 194 if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
borlanic 0:fbdae7e6d805 195 &oid, &oid_len ) ) != 0 )
borlanic 0:fbdae7e6d805 196 {
borlanic 0:fbdae7e6d805 197 return( ret );
borlanic 0:fbdae7e6d805 198 }
borlanic 0:fbdae7e6d805 199
borlanic 0:fbdae7e6d805 200 #if defined(MBEDTLS_ECP_C)
borlanic 0:fbdae7e6d805 201 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
borlanic 0:fbdae7e6d805 202 {
borlanic 0:fbdae7e6d805 203 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
borlanic 0:fbdae7e6d805 204 }
borlanic 0:fbdae7e6d805 205 #endif
borlanic 0:fbdae7e6d805 206
borlanic 0:fbdae7e6d805 207 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
borlanic 0:fbdae7e6d805 208 par_len ) );
borlanic 0:fbdae7e6d805 209
borlanic 0:fbdae7e6d805 210 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
borlanic 0:fbdae7e6d805 211 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
borlanic 0:fbdae7e6d805 212 MBEDTLS_ASN1_SEQUENCE ) );
borlanic 0:fbdae7e6d805 213
borlanic 0:fbdae7e6d805 214 return( (int) len );
borlanic 0:fbdae7e6d805 215 }
borlanic 0:fbdae7e6d805 216
borlanic 0:fbdae7e6d805 217 int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
borlanic 0:fbdae7e6d805 218 {
borlanic 0:fbdae7e6d805 219 int ret;
borlanic 0:fbdae7e6d805 220 unsigned char *c = buf + size;
borlanic 0:fbdae7e6d805 221 size_t len = 0;
borlanic 0:fbdae7e6d805 222
borlanic 0:fbdae7e6d805 223 #if defined(MBEDTLS_RSA_C)
borlanic 0:fbdae7e6d805 224 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
borlanic 0:fbdae7e6d805 225 {
borlanic 0:fbdae7e6d805 226 mbedtls_mpi T; /* Temporary holding the exported parameters */
borlanic 0:fbdae7e6d805 227 mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
borlanic 0:fbdae7e6d805 228
borlanic 0:fbdae7e6d805 229 /*
borlanic 0:fbdae7e6d805 230 * Export the parameters one after another to avoid simultaneous copies.
borlanic 0:fbdae7e6d805 231 */
borlanic 0:fbdae7e6d805 232
borlanic 0:fbdae7e6d805 233 mbedtls_mpi_init( &T );
borlanic 0:fbdae7e6d805 234
borlanic 0:fbdae7e6d805 235 /* Export QP */
borlanic 0:fbdae7e6d805 236 if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, NULL, &T ) ) != 0 ||
borlanic 0:fbdae7e6d805 237 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 238 goto end_of_export;
borlanic 0:fbdae7e6d805 239 len += ret;
borlanic 0:fbdae7e6d805 240
borlanic 0:fbdae7e6d805 241 /* Export DQ */
borlanic 0:fbdae7e6d805 242 if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, &T, NULL ) ) != 0 ||
borlanic 0:fbdae7e6d805 243 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 244 goto end_of_export;
borlanic 0:fbdae7e6d805 245 len += ret;
borlanic 0:fbdae7e6d805 246
borlanic 0:fbdae7e6d805 247 /* Export DP */
borlanic 0:fbdae7e6d805 248 if( ( ret = mbedtls_rsa_export_crt( rsa, &T, NULL, NULL ) ) != 0 ||
borlanic 0:fbdae7e6d805 249 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 250 goto end_of_export;
borlanic 0:fbdae7e6d805 251 len += ret;
borlanic 0:fbdae7e6d805 252
borlanic 0:fbdae7e6d805 253 /* Export Q */
borlanic 0:fbdae7e6d805 254 if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
borlanic 0:fbdae7e6d805 255 &T, NULL, NULL ) ) != 0 ||
borlanic 0:fbdae7e6d805 256 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 257 goto end_of_export;
borlanic 0:fbdae7e6d805 258 len += ret;
borlanic 0:fbdae7e6d805 259
borlanic 0:fbdae7e6d805 260 /* Export P */
borlanic 0:fbdae7e6d805 261 if ( ( ret = mbedtls_rsa_export( rsa, NULL, &T,
borlanic 0:fbdae7e6d805 262 NULL, NULL, NULL ) ) != 0 ||
borlanic 0:fbdae7e6d805 263 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 264 goto end_of_export;
borlanic 0:fbdae7e6d805 265 len += ret;
borlanic 0:fbdae7e6d805 266
borlanic 0:fbdae7e6d805 267 /* Export D */
borlanic 0:fbdae7e6d805 268 if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
borlanic 0:fbdae7e6d805 269 NULL, &T, NULL ) ) != 0 ||
borlanic 0:fbdae7e6d805 270 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 271 goto end_of_export;
borlanic 0:fbdae7e6d805 272 len += ret;
borlanic 0:fbdae7e6d805 273
borlanic 0:fbdae7e6d805 274 /* Export E */
borlanic 0:fbdae7e6d805 275 if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
borlanic 0:fbdae7e6d805 276 NULL, NULL, &T ) ) != 0 ||
borlanic 0:fbdae7e6d805 277 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 278 goto end_of_export;
borlanic 0:fbdae7e6d805 279 len += ret;
borlanic 0:fbdae7e6d805 280
borlanic 0:fbdae7e6d805 281 /* Export N */
borlanic 0:fbdae7e6d805 282 if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL,
borlanic 0:fbdae7e6d805 283 NULL, NULL, NULL ) ) != 0 ||
borlanic 0:fbdae7e6d805 284 ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
borlanic 0:fbdae7e6d805 285 goto end_of_export;
borlanic 0:fbdae7e6d805 286 len += ret;
borlanic 0:fbdae7e6d805 287
borlanic 0:fbdae7e6d805 288 end_of_export:
borlanic 0:fbdae7e6d805 289
borlanic 0:fbdae7e6d805 290 mbedtls_mpi_free( &T );
borlanic 0:fbdae7e6d805 291 if( ret < 0 )
borlanic 0:fbdae7e6d805 292 return( ret );
borlanic 0:fbdae7e6d805 293
borlanic 0:fbdae7e6d805 294 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
borlanic 0:fbdae7e6d805 295 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
borlanic 0:fbdae7e6d805 296 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c,
borlanic 0:fbdae7e6d805 297 buf, MBEDTLS_ASN1_CONSTRUCTED |
borlanic 0:fbdae7e6d805 298 MBEDTLS_ASN1_SEQUENCE ) );
borlanic 0:fbdae7e6d805 299 }
borlanic 0:fbdae7e6d805 300 else
borlanic 0:fbdae7e6d805 301 #endif /* MBEDTLS_RSA_C */
borlanic 0:fbdae7e6d805 302 #if defined(MBEDTLS_ECP_C)
borlanic 0:fbdae7e6d805 303 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
borlanic 0:fbdae7e6d805 304 {
borlanic 0:fbdae7e6d805 305 mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
borlanic 0:fbdae7e6d805 306 size_t pub_len = 0, par_len = 0;
borlanic 0:fbdae7e6d805 307
borlanic 0:fbdae7e6d805 308 /*
borlanic 0:fbdae7e6d805 309 * RFC 5915, or SEC1 Appendix C.4
borlanic 0:fbdae7e6d805 310 *
borlanic 0:fbdae7e6d805 311 * ECPrivateKey ::= SEQUENCE {
borlanic 0:fbdae7e6d805 312 * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
borlanic 0:fbdae7e6d805 313 * privateKey OCTET STRING,
borlanic 0:fbdae7e6d805 314 * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
borlanic 0:fbdae7e6d805 315 * publicKey [1] BIT STRING OPTIONAL
borlanic 0:fbdae7e6d805 316 * }
borlanic 0:fbdae7e6d805 317 */
borlanic 0:fbdae7e6d805 318
borlanic 0:fbdae7e6d805 319 /* publicKey */
borlanic 0:fbdae7e6d805 320 MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
borlanic 0:fbdae7e6d805 321
borlanic 0:fbdae7e6d805 322 if( c - buf < 1 )
borlanic 0:fbdae7e6d805 323 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
borlanic 0:fbdae7e6d805 324 *--c = 0;
borlanic 0:fbdae7e6d805 325 pub_len += 1;
borlanic 0:fbdae7e6d805 326
borlanic 0:fbdae7e6d805 327 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
borlanic 0:fbdae7e6d805 328 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
borlanic 0:fbdae7e6d805 329
borlanic 0:fbdae7e6d805 330 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
borlanic 0:fbdae7e6d805 331 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
borlanic 0:fbdae7e6d805 332 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
borlanic 0:fbdae7e6d805 333 len += pub_len;
borlanic 0:fbdae7e6d805 334
borlanic 0:fbdae7e6d805 335 /* parameters */
borlanic 0:fbdae7e6d805 336 MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
borlanic 0:fbdae7e6d805 337
borlanic 0:fbdae7e6d805 338 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
borlanic 0:fbdae7e6d805 339 MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
borlanic 0:fbdae7e6d805 340 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
borlanic 0:fbdae7e6d805 341 len += par_len;
borlanic 0:fbdae7e6d805 342
borlanic 0:fbdae7e6d805 343 /* privateKey: write as MPI then fix tag */
borlanic 0:fbdae7e6d805 344 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
borlanic 0:fbdae7e6d805 345 *c = MBEDTLS_ASN1_OCTET_STRING;
borlanic 0:fbdae7e6d805 346
borlanic 0:fbdae7e6d805 347 /* version */
borlanic 0:fbdae7e6d805 348 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
borlanic 0:fbdae7e6d805 349
borlanic 0:fbdae7e6d805 350 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
borlanic 0:fbdae7e6d805 351 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
borlanic 0:fbdae7e6d805 352 MBEDTLS_ASN1_SEQUENCE ) );
borlanic 0:fbdae7e6d805 353 }
borlanic 0:fbdae7e6d805 354 else
borlanic 0:fbdae7e6d805 355 #endif /* MBEDTLS_ECP_C */
borlanic 0:fbdae7e6d805 356 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
borlanic 0:fbdae7e6d805 357
borlanic 0:fbdae7e6d805 358 return( (int) len );
borlanic 0:fbdae7e6d805 359 }
borlanic 0:fbdae7e6d805 360
borlanic 0:fbdae7e6d805 361 #if defined(MBEDTLS_PEM_WRITE_C)
borlanic 0:fbdae7e6d805 362
borlanic 0:fbdae7e6d805 363 #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
borlanic 0:fbdae7e6d805 364 #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
borlanic 0:fbdae7e6d805 365
borlanic 0:fbdae7e6d805 366 #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
borlanic 0:fbdae7e6d805 367 #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
borlanic 0:fbdae7e6d805 368 #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
borlanic 0:fbdae7e6d805 369 #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
borlanic 0:fbdae7e6d805 370
borlanic 0:fbdae7e6d805 371 /*
borlanic 0:fbdae7e6d805 372 * Max sizes of key per types. Shown as tag + len (+ content).
borlanic 0:fbdae7e6d805 373 */
borlanic 0:fbdae7e6d805 374
borlanic 0:fbdae7e6d805 375 #if defined(MBEDTLS_RSA_C)
borlanic 0:fbdae7e6d805 376 /*
borlanic 0:fbdae7e6d805 377 * RSA public keys:
borlanic 0:fbdae7e6d805 378 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
borlanic 0:fbdae7e6d805 379 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
borlanic 0:fbdae7e6d805 380 * + 1 + 1 + 9 (rsa oid)
borlanic 0:fbdae7e6d805 381 * + 1 + 1 (params null)
borlanic 0:fbdae7e6d805 382 * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
borlanic 0:fbdae7e6d805 383 * RSAPublicKey ::= SEQUENCE { 1 + 3
borlanic 0:fbdae7e6d805 384 * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
borlanic 0:fbdae7e6d805 385 * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
borlanic 0:fbdae7e6d805 386 * }
borlanic 0:fbdae7e6d805 387 */
borlanic 0:fbdae7e6d805 388 #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
borlanic 0:fbdae7e6d805 389
borlanic 0:fbdae7e6d805 390 /*
borlanic 0:fbdae7e6d805 391 * RSA private keys:
borlanic 0:fbdae7e6d805 392 * RSAPrivateKey ::= SEQUENCE { 1 + 3
borlanic 0:fbdae7e6d805 393 * version Version, 1 + 1 + 1
borlanic 0:fbdae7e6d805 394 * modulus INTEGER, 1 + 3 + MPI_MAX + 1
borlanic 0:fbdae7e6d805 395 * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
borlanic 0:fbdae7e6d805 396 * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
borlanic 0:fbdae7e6d805 397 * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
borlanic 0:fbdae7e6d805 398 * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
borlanic 0:fbdae7e6d805 399 * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
borlanic 0:fbdae7e6d805 400 * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
borlanic 0:fbdae7e6d805 401 * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
borlanic 0:fbdae7e6d805 402 * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
borlanic 0:fbdae7e6d805 403 * }
borlanic 0:fbdae7e6d805 404 */
borlanic 0:fbdae7e6d805 405 #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
borlanic 0:fbdae7e6d805 406 MBEDTLS_MPI_MAX_SIZE % 2
borlanic 0:fbdae7e6d805 407 #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
borlanic 0:fbdae7e6d805 408 + 5 * MPI_MAX_SIZE_2
borlanic 0:fbdae7e6d805 409
borlanic 0:fbdae7e6d805 410 #else /* MBEDTLS_RSA_C */
borlanic 0:fbdae7e6d805 411
borlanic 0:fbdae7e6d805 412 #define RSA_PUB_DER_MAX_BYTES 0
borlanic 0:fbdae7e6d805 413 #define RSA_PRV_DER_MAX_BYTES 0
borlanic 0:fbdae7e6d805 414
borlanic 0:fbdae7e6d805 415 #endif /* MBEDTLS_RSA_C */
borlanic 0:fbdae7e6d805 416
borlanic 0:fbdae7e6d805 417 #if defined(MBEDTLS_ECP_C)
borlanic 0:fbdae7e6d805 418 /*
borlanic 0:fbdae7e6d805 419 * EC public keys:
borlanic 0:fbdae7e6d805 420 * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
borlanic 0:fbdae7e6d805 421 * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
borlanic 0:fbdae7e6d805 422 * + 1 + 1 + 7 (ec oid)
borlanic 0:fbdae7e6d805 423 * + 1 + 1 + 9 (namedCurve oid)
borlanic 0:fbdae7e6d805 424 * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
borlanic 0:fbdae7e6d805 425 * + 1 (point format) [1]
borlanic 0:fbdae7e6d805 426 * + 2 * ECP_MAX (coords) [1]
borlanic 0:fbdae7e6d805 427 * }
borlanic 0:fbdae7e6d805 428 */
borlanic 0:fbdae7e6d805 429 #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
borlanic 0:fbdae7e6d805 430
borlanic 0:fbdae7e6d805 431 /*
borlanic 0:fbdae7e6d805 432 * EC private keys:
borlanic 0:fbdae7e6d805 433 * ECPrivateKey ::= SEQUENCE { 1 + 2
borlanic 0:fbdae7e6d805 434 * version INTEGER , 1 + 1 + 1
borlanic 0:fbdae7e6d805 435 * privateKey OCTET STRING, 1 + 1 + ECP_MAX
borlanic 0:fbdae7e6d805 436 * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
borlanic 0:fbdae7e6d805 437 * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
borlanic 0:fbdae7e6d805 438 * }
borlanic 0:fbdae7e6d805 439 */
borlanic 0:fbdae7e6d805 440 #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
borlanic 0:fbdae7e6d805 441
borlanic 0:fbdae7e6d805 442 #else /* MBEDTLS_ECP_C */
borlanic 0:fbdae7e6d805 443
borlanic 0:fbdae7e6d805 444 #define ECP_PUB_DER_MAX_BYTES 0
borlanic 0:fbdae7e6d805 445 #define ECP_PRV_DER_MAX_BYTES 0
borlanic 0:fbdae7e6d805 446
borlanic 0:fbdae7e6d805 447 #endif /* MBEDTLS_ECP_C */
borlanic 0:fbdae7e6d805 448
borlanic 0:fbdae7e6d805 449 #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
borlanic 0:fbdae7e6d805 450 RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
borlanic 0:fbdae7e6d805 451 #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
borlanic 0:fbdae7e6d805 452 RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
borlanic 0:fbdae7e6d805 453
borlanic 0:fbdae7e6d805 454 int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
borlanic 0:fbdae7e6d805 455 {
borlanic 0:fbdae7e6d805 456 int ret;
borlanic 0:fbdae7e6d805 457 unsigned char output_buf[PUB_DER_MAX_BYTES];
borlanic 0:fbdae7e6d805 458 size_t olen = 0;
borlanic 0:fbdae7e6d805 459
borlanic 0:fbdae7e6d805 460 if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
borlanic 0:fbdae7e6d805 461 sizeof(output_buf) ) ) < 0 )
borlanic 0:fbdae7e6d805 462 {
borlanic 0:fbdae7e6d805 463 return( ret );
borlanic 0:fbdae7e6d805 464 }
borlanic 0:fbdae7e6d805 465
borlanic 0:fbdae7e6d805 466 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
borlanic 0:fbdae7e6d805 467 output_buf + sizeof(output_buf) - ret,
borlanic 0:fbdae7e6d805 468 ret, buf, size, &olen ) ) != 0 )
borlanic 0:fbdae7e6d805 469 {
borlanic 0:fbdae7e6d805 470 return( ret );
borlanic 0:fbdae7e6d805 471 }
borlanic 0:fbdae7e6d805 472
borlanic 0:fbdae7e6d805 473 return( 0 );
borlanic 0:fbdae7e6d805 474 }
borlanic 0:fbdae7e6d805 475
borlanic 0:fbdae7e6d805 476 int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
borlanic 0:fbdae7e6d805 477 {
borlanic 0:fbdae7e6d805 478 int ret;
borlanic 0:fbdae7e6d805 479 unsigned char output_buf[PRV_DER_MAX_BYTES];
borlanic 0:fbdae7e6d805 480 const char *begin, *end;
borlanic 0:fbdae7e6d805 481 size_t olen = 0;
borlanic 0:fbdae7e6d805 482
borlanic 0:fbdae7e6d805 483 if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
borlanic 0:fbdae7e6d805 484 return( ret );
borlanic 0:fbdae7e6d805 485
borlanic 0:fbdae7e6d805 486 #if defined(MBEDTLS_RSA_C)
borlanic 0:fbdae7e6d805 487 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
borlanic 0:fbdae7e6d805 488 {
borlanic 0:fbdae7e6d805 489 begin = PEM_BEGIN_PRIVATE_KEY_RSA;
borlanic 0:fbdae7e6d805 490 end = PEM_END_PRIVATE_KEY_RSA;
borlanic 0:fbdae7e6d805 491 }
borlanic 0:fbdae7e6d805 492 else
borlanic 0:fbdae7e6d805 493 #endif
borlanic 0:fbdae7e6d805 494 #if defined(MBEDTLS_ECP_C)
borlanic 0:fbdae7e6d805 495 if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
borlanic 0:fbdae7e6d805 496 {
borlanic 0:fbdae7e6d805 497 begin = PEM_BEGIN_PRIVATE_KEY_EC;
borlanic 0:fbdae7e6d805 498 end = PEM_END_PRIVATE_KEY_EC;
borlanic 0:fbdae7e6d805 499 }
borlanic 0:fbdae7e6d805 500 else
borlanic 0:fbdae7e6d805 501 #endif
borlanic 0:fbdae7e6d805 502 return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
borlanic 0:fbdae7e6d805 503
borlanic 0:fbdae7e6d805 504 if( ( ret = mbedtls_pem_write_buffer( begin, end,
borlanic 0:fbdae7e6d805 505 output_buf + sizeof(output_buf) - ret,
borlanic 0:fbdae7e6d805 506 ret, buf, size, &olen ) ) != 0 )
borlanic 0:fbdae7e6d805 507 {
borlanic 0:fbdae7e6d805 508 return( ret );
borlanic 0:fbdae7e6d805 509 }
borlanic 0:fbdae7e6d805 510
borlanic 0:fbdae7e6d805 511 return( 0 );
borlanic 0:fbdae7e6d805 512 }
borlanic 0:fbdae7e6d805 513 #endif /* MBEDTLS_PEM_WRITE_C */
borlanic 0:fbdae7e6d805 514
borlanic 0:fbdae7e6d805 515 #endif /* MBEDTLS_PK_WRITE_C */