| 1 | /* |
| 2 | * Public Key layer for writing key files and structures |
| 3 | * |
| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved |
| 5 | * SPDX-License-Identifier: GPL-2.0 |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * This file is part of mbed TLS (https://tls.mbed.org) |
| 22 | */ |
| 23 | |
| 24 | #if !defined(MBEDTLS_CONFIG_FILE) |
| 25 | #include "mbedtls/config.h" |
| 26 | #else |
| 27 | #include MBEDTLS_CONFIG_FILE |
| 28 | #endif |
| 29 | |
| 30 | #if defined(MBEDTLS_PK_WRITE_C) |
| 31 | |
| 32 | #include "mbedtls/pk.h" |
| 33 | #include "mbedtls/asn1write.h" |
| 34 | #include "mbedtls/oid.h" |
| 35 | |
| 36 | #include <string.h> |
| 37 | |
| 38 | #if defined(MBEDTLS_RSA_C) |
| 39 | #include "mbedtls/rsa.h" |
| 40 | #endif |
| 41 | #if defined(MBEDTLS_ECP_C) |
| 42 | #include "mbedtls/ecp.h" |
| 43 | #endif |
| 44 | #if defined(MBEDTLS_ECDSA_C) |
| 45 | #include "mbedtls/ecdsa.h" |
| 46 | #endif |
| 47 | #if defined(MBEDTLS_PEM_WRITE_C) |
| 48 | #include "mbedtls/pem.h" |
| 49 | #endif |
| 50 | |
| 51 | #if defined(MBEDTLS_PLATFORM_C) |
| 52 | #include "mbedtls/platform.h" |
| 53 | #else |
| 54 | #include <stdlib.h> |
| 55 | #define mbedtls_calloc calloc |
| 56 | #define mbedtls_free free |
| 57 | #endif |
| 58 | |
| 59 | #if defined(MBEDTLS_RSA_C) |
| 60 | /* |
| 61 | * RSAPublicKey ::= SEQUENCE { |
| 62 | * modulus INTEGER, -- n |
| 63 | * publicExponent INTEGER -- e |
| 64 | * } |
| 65 | */ |
| 66 | static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start, |
| 67 | mbedtls_rsa_context *rsa ) |
| 68 | { |
| 69 | int ret; |
| 70 | size_t len = 0; |
| 71 | mbedtls_mpi T; |
| 72 | |
| 73 | mbedtls_mpi_init( &T ); |
| 74 | |
| 75 | /* Export E */ |
| 76 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &T ) ) != 0 || |
| 77 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 ) |
| 78 | goto end_of_export; |
| 79 | len += ret; |
| 80 | |
| 81 | /* Export N */ |
| 82 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, NULL, NULL, NULL ) ) != 0 || |
| 83 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 ) |
| 84 | goto end_of_export; |
| 85 | len += ret; |
| 86 | |
| 87 | end_of_export: |
| 88 | |
| 89 | mbedtls_mpi_free( &T ); |
| 90 | if( ret < 0 ) |
| 91 | return( ret ); |
| 92 | |
| 93 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); |
| 94 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED | |
| 95 | MBEDTLS_ASN1_SEQUENCE ) ); |
| 96 | |
| 97 | return( (int) len ); |
| 98 | } |
| 99 | #endif /* MBEDTLS_RSA_C */ |
| 100 | |
| 101 | #if defined(MBEDTLS_ECP_C) |
| 102 | /* |
| 103 | * EC public key is an EC point |
| 104 | */ |
| 105 | static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start, |
| 106 | mbedtls_ecp_keypair *ec ) |
| 107 | { |
| 108 | int ret; |
| 109 | size_t len = 0; |
| 110 | unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN]; |
| 111 | |
| 112 | if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q, |
| 113 | MBEDTLS_ECP_PF_UNCOMPRESSED, |
| 114 | &len, buf, sizeof( buf ) ) ) != 0 ) |
| 115 | { |
| 116 | return( ret ); |
| 117 | } |
| 118 | |
| 119 | if( *p < start || (size_t)( *p - start ) < len ) |
| 120 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
| 121 | |
| 122 | *p -= len; |
| 123 | memcpy( *p, buf, len ); |
| 124 | |
| 125 | return( (int) len ); |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * ECParameters ::= CHOICE { |
| 130 | * namedCurve OBJECT IDENTIFIER |
| 131 | * } |
| 132 | */ |
| 133 | static int pk_write_ec_param( unsigned char **p, unsigned char *start, |
| 134 | mbedtls_ecp_keypair *ec ) |
| 135 | { |
| 136 | int ret; |
| 137 | size_t len = 0; |
| 138 | const char *oid; |
| 139 | size_t oid_len; |
| 140 | |
| 141 | if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 ) |
| 142 | return( ret ); |
| 143 | |
| 144 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) ); |
| 145 | |
| 146 | return( (int) len ); |
| 147 | } |
| 148 | #endif /* MBEDTLS_ECP_C */ |
| 149 | |
| 150 | int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start, |
| 151 | const mbedtls_pk_context *key ) |
| 152 | { |
| 153 | int ret; |
| 154 | size_t len = 0; |
| 155 | |
| 156 | #if defined(MBEDTLS_RSA_C) |
| 157 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA ) |
| 158 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) ); |
| 159 | else |
| 160 | #endif |
| 161 | #if defined(MBEDTLS_ECP_C) |
| 162 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
| 163 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) ); |
| 164 | else |
| 165 | #endif |
| 166 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
| 167 | |
| 168 | return( (int) len ); |
| 169 | } |
| 170 | |
| 171 | int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
| 172 | { |
| 173 | int ret; |
| 174 | unsigned char *c; |
| 175 | size_t len = 0, par_len = 0, oid_len; |
| 176 | const char *oid; |
| 177 | |
| 178 | c = buf + size; |
| 179 | |
| 180 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) ); |
| 181 | |
| 182 | if( c - buf < 1 ) |
| 183 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
| 184 | |
| 185 | /* |
| 186 | * SubjectPublicKeyInfo ::= SEQUENCE { |
| 187 | * algorithm AlgorithmIdentifier, |
| 188 | * subjectPublicKey BIT STRING } |
| 189 | */ |
| 190 | *--c = 0; |
| 191 | len += 1; |
| 192 | |
| 193 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
| 194 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) ); |
| 195 | |
| 196 | if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ), |
| 197 | &oid, &oid_len ) ) != 0 ) |
| 198 | { |
| 199 | return( ret ); |
| 200 | } |
| 201 | |
| 202 | #if defined(MBEDTLS_ECP_C) |
| 203 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
| 204 | { |
| 205 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) ); |
| 206 | } |
| 207 | #endif |
| 208 | |
| 209 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len, |
| 210 | par_len ) ); |
| 211 | |
| 212 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
| 213 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED | |
| 214 | MBEDTLS_ASN1_SEQUENCE ) ); |
| 215 | |
| 216 | return( (int) len ); |
| 217 | } |
| 218 | |
| 219 | int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
| 220 | { |
| 221 | int ret; |
| 222 | unsigned char *c = buf + size; |
| 223 | size_t len = 0; |
| 224 | |
| 225 | #if defined(MBEDTLS_RSA_C) |
| 226 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA ) |
| 227 | { |
| 228 | mbedtls_mpi T; /* Temporary holding the exported parameters */ |
| 229 | mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key ); |
| 230 | |
| 231 | /* |
| 232 | * Export the parameters one after another to avoid simultaneous copies. |
| 233 | */ |
| 234 | |
| 235 | mbedtls_mpi_init( &T ); |
| 236 | |
| 237 | /* Export QP */ |
| 238 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, NULL, &T ) ) != 0 || |
| 239 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 240 | goto end_of_export; |
| 241 | len += ret; |
| 242 | |
| 243 | /* Export DQ */ |
| 244 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, &T, NULL ) ) != 0 || |
| 245 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 246 | goto end_of_export; |
| 247 | len += ret; |
| 248 | |
| 249 | /* Export DP */ |
| 250 | if( ( ret = mbedtls_rsa_export_crt( rsa, &T, NULL, NULL ) ) != 0 || |
| 251 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 252 | goto end_of_export; |
| 253 | len += ret; |
| 254 | |
| 255 | /* Export Q */ |
| 256 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, |
| 257 | &T, NULL, NULL ) ) != 0 || |
| 258 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 259 | goto end_of_export; |
| 260 | len += ret; |
| 261 | |
| 262 | /* Export P */ |
| 263 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, &T, |
| 264 | NULL, NULL, NULL ) ) != 0 || |
| 265 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 266 | goto end_of_export; |
| 267 | len += ret; |
| 268 | |
| 269 | /* Export D */ |
| 270 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, |
| 271 | NULL, &T, NULL ) ) != 0 || |
| 272 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 273 | goto end_of_export; |
| 274 | len += ret; |
| 275 | |
| 276 | /* Export E */ |
| 277 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, |
| 278 | NULL, NULL, &T ) ) != 0 || |
| 279 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 280 | goto end_of_export; |
| 281 | len += ret; |
| 282 | |
| 283 | /* Export N */ |
| 284 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, |
| 285 | NULL, NULL, NULL ) ) != 0 || |
| 286 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
| 287 | goto end_of_export; |
| 288 | len += ret; |
| 289 | |
| 290 | end_of_export: |
| 291 | |
| 292 | mbedtls_mpi_free( &T ); |
| 293 | if( ret < 0 ) |
| 294 | return( ret ); |
| 295 | |
| 296 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) ); |
| 297 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
| 298 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, |
| 299 | buf, MBEDTLS_ASN1_CONSTRUCTED | |
| 300 | MBEDTLS_ASN1_SEQUENCE ) ); |
| 301 | } |
| 302 | else |
| 303 | #endif /* MBEDTLS_RSA_C */ |
| 304 | #if defined(MBEDTLS_ECP_C) |
| 305 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
| 306 | { |
| 307 | mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key ); |
| 308 | size_t pub_len = 0, par_len = 0; |
| 309 | |
| 310 | /* |
| 311 | * RFC 5915, or SEC1 Appendix C.4 |
| 312 | * |
| 313 | * ECPrivateKey ::= SEQUENCE { |
| 314 | * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), |
| 315 | * privateKey OCTET STRING, |
| 316 | * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL, |
| 317 | * publicKey [1] BIT STRING OPTIONAL |
| 318 | * } |
| 319 | */ |
| 320 | |
| 321 | /* publicKey */ |
| 322 | MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) ); |
| 323 | |
| 324 | if( c - buf < 1 ) |
| 325 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
| 326 | *--c = 0; |
| 327 | pub_len += 1; |
| 328 | |
| 329 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) ); |
| 330 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) ); |
| 331 | |
| 332 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) ); |
| 333 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, |
| 334 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ); |
| 335 | len += pub_len; |
| 336 | |
| 337 | /* parameters */ |
| 338 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) ); |
| 339 | |
| 340 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) ); |
| 341 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf, |
| 342 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ); |
| 343 | len += par_len; |
| 344 | |
| 345 | /* privateKey: write as MPI then fix tag */ |
| 346 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) ); |
| 347 | *c = MBEDTLS_ASN1_OCTET_STRING; |
| 348 | |
| 349 | /* version */ |
| 350 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) ); |
| 351 | |
| 352 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
| 353 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED | |
| 354 | MBEDTLS_ASN1_SEQUENCE ) ); |
| 355 | } |
| 356 | else |
| 357 | #endif /* MBEDTLS_ECP_C */ |
| 358 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
| 359 | |
| 360 | return( (int) len ); |
| 361 | } |
| 362 | |
| 363 | #if defined(MBEDTLS_PEM_WRITE_C) |
| 364 | |
| 365 | #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n" |
| 366 | #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n" |
| 367 | |
| 368 | #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n" |
| 369 | #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n" |
| 370 | #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n" |
| 371 | #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n" |
| 372 | |
| 373 | /* |
| 374 | * Max sizes of key per types. Shown as tag + len (+ content). |
| 375 | */ |
| 376 | |
| 377 | #if defined(MBEDTLS_RSA_C) |
| 378 | /* |
| 379 | * RSA public keys: |
| 380 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3 |
| 381 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence) |
| 382 | * + 1 + 1 + 9 (rsa oid) |
| 383 | * + 1 + 1 (params null) |
| 384 | * subjectPublicKey BIT STRING } 1 + 3 + (1 + below) |
| 385 | * RSAPublicKey ::= SEQUENCE { 1 + 3 |
| 386 | * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1 |
| 387 | * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1 |
| 388 | * } |
| 389 | */ |
| 390 | #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE |
| 391 | |
| 392 | /* |
| 393 | * RSA private keys: |
| 394 | * RSAPrivateKey ::= SEQUENCE { 1 + 3 |
| 395 | * version Version, 1 + 1 + 1 |
| 396 | * modulus INTEGER, 1 + 3 + MPI_MAX + 1 |
| 397 | * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1 |
| 398 | * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1 |
| 399 | * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
| 400 | * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
| 401 | * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
| 402 | * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
| 403 | * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
| 404 | * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported) |
| 405 | * } |
| 406 | */ |
| 407 | #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \ |
| 408 | MBEDTLS_MPI_MAX_SIZE % 2 |
| 409 | #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \ |
| 410 | + 5 * MPI_MAX_SIZE_2 |
| 411 | |
| 412 | #else /* MBEDTLS_RSA_C */ |
| 413 | |
| 414 | #define RSA_PUB_DER_MAX_BYTES 0 |
| 415 | #define RSA_PRV_DER_MAX_BYTES 0 |
| 416 | |
| 417 | #endif /* MBEDTLS_RSA_C */ |
| 418 | |
| 419 | #if defined(MBEDTLS_ECP_C) |
| 420 | /* |
| 421 | * EC public keys: |
| 422 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2 |
| 423 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence) |
| 424 | * + 1 + 1 + 7 (ec oid) |
| 425 | * + 1 + 1 + 9 (namedCurve oid) |
| 426 | * subjectPublicKey BIT STRING 1 + 2 + 1 [1] |
| 427 | * + 1 (point format) [1] |
| 428 | * + 2 * ECP_MAX (coords) [1] |
| 429 | * } |
| 430 | */ |
| 431 | #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES |
| 432 | |
| 433 | /* |
| 434 | * EC private keys: |
| 435 | * ECPrivateKey ::= SEQUENCE { 1 + 2 |
| 436 | * version INTEGER , 1 + 1 + 1 |
| 437 | * privateKey OCTET STRING, 1 + 1 + ECP_MAX |
| 438 | * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9) |
| 439 | * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above |
| 440 | * } |
| 441 | */ |
| 442 | #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES |
| 443 | |
| 444 | #else /* MBEDTLS_ECP_C */ |
| 445 | |
| 446 | #define ECP_PUB_DER_MAX_BYTES 0 |
| 447 | #define ECP_PRV_DER_MAX_BYTES 0 |
| 448 | |
| 449 | #endif /* MBEDTLS_ECP_C */ |
| 450 | |
| 451 | #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \ |
| 452 | RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES |
| 453 | #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \ |
| 454 | RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES |
| 455 | |
| 456 | int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
| 457 | { |
| 458 | int ret; |
| 459 | unsigned char output_buf[PUB_DER_MAX_BYTES]; |
| 460 | size_t olen = 0; |
| 461 | |
| 462 | if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf, |
| 463 | sizeof(output_buf) ) ) < 0 ) |
| 464 | { |
| 465 | return( ret ); |
| 466 | } |
| 467 | |
| 468 | if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY, |
| 469 | output_buf + sizeof(output_buf) - ret, |
| 470 | ret, buf, size, &olen ) ) != 0 ) |
| 471 | { |
| 472 | return( ret ); |
| 473 | } |
| 474 | |
| 475 | return( 0 ); |
| 476 | } |
| 477 | |
| 478 | int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
| 479 | { |
| 480 | int ret; |
| 481 | unsigned char output_buf[PRV_DER_MAX_BYTES]; |
| 482 | const char *begin, *end; |
| 483 | size_t olen = 0; |
| 484 | |
| 485 | if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 ) |
| 486 | return( ret ); |
| 487 | |
| 488 | #if defined(MBEDTLS_RSA_C) |
| 489 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA ) |
| 490 | { |
| 491 | begin = PEM_BEGIN_PRIVATE_KEY_RSA; |
| 492 | end = PEM_END_PRIVATE_KEY_RSA; |
| 493 | } |
| 494 | else |
| 495 | #endif |
| 496 | #if defined(MBEDTLS_ECP_C) |
| 497 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
| 498 | { |
| 499 | begin = PEM_BEGIN_PRIVATE_KEY_EC; |
| 500 | end = PEM_END_PRIVATE_KEY_EC; |
| 501 | } |
| 502 | else |
| 503 | #endif |
| 504 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
| 505 | |
| 506 | if( ( ret = mbedtls_pem_write_buffer( begin, end, |
| 507 | output_buf + sizeof(output_buf) - ret, |
| 508 | ret, buf, size, &olen ) ) != 0 ) |
| 509 | { |
| 510 | return( ret ); |
| 511 | } |
| 512 | |
| 513 | return( 0 ); |
| 514 | } |
| 515 | #endif /* MBEDTLS_PEM_WRITE_C */ |
| 516 | |
| 517 | #endif /* MBEDTLS_PK_WRITE_C */ |