[398] | 1 | /*
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| 2 | * Public Key layer for writing key files and structures
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| 3 | *
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| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 |
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| 22 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 23 | #include "mbedtls/config.h"
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| 24 | #else
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| 25 | #include MBEDTLS_CONFIG_FILE
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| 26 | #endif
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| 27 |
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| 28 | #if defined(MBEDTLS_PK_WRITE_C)
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| 29 |
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| 30 | #include "mbedtls/pk.h"
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| 31 | #include "mbedtls/asn1write.h"
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| 32 | #include "mbedtls/oid.h"
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| 33 | #include "mbedtls/platform_util.h"
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| 34 |
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| 35 | #include <string.h>
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| 36 |
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| 37 | #if defined(MBEDTLS_RSA_C)
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| 38 | #include "mbedtls/rsa.h"
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| 39 | #endif
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| 40 | #if defined(MBEDTLS_ECP_C)
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| 41 | #include "mbedtls/ecp.h"
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| 42 | #endif
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| 43 | #if defined(MBEDTLS_ECDSA_C)
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| 44 | #include "mbedtls/ecdsa.h"
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| 45 | #endif
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| 46 | #if defined(MBEDTLS_PEM_WRITE_C)
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| 47 | #include "mbedtls/pem.h"
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| 48 | #endif
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| 49 |
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| 50 | #if defined(MBEDTLS_PLATFORM_C)
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| 51 | #include "mbedtls/platform.h"
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| 52 | #else
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| 53 | #include <stdlib.h>
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| 54 | #define mbedtls_calloc calloc
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| 55 | #define mbedtls_free free
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| 56 | #endif
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| 57 |
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| 58 | /* Parameter validation macros based on platform_util.h */
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| 59 | #define PK_VALIDATE_RET( cond ) \
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| 60 | MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA )
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| 61 | #define PK_VALIDATE( cond ) \
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| 62 | MBEDTLS_INTERNAL_VALIDATE( cond )
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| 63 |
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| 64 | #if defined(MBEDTLS_RSA_C)
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| 65 | /*
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| 66 | * RSAPublicKey ::= SEQUENCE {
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| 67 | * modulus INTEGER, -- n
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| 68 | * publicExponent INTEGER -- e
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| 69 | * }
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| 70 | */
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| 71 | static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
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| 72 | mbedtls_rsa_context *rsa )
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| 73 | {
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| 74 | int ret;
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| 75 | size_t len = 0;
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| 76 | mbedtls_mpi T;
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| 77 |
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| 78 | mbedtls_mpi_init( &T );
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| 79 |
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| 80 | /* Export E */
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| 81 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &T ) ) != 0 ||
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| 82 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
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| 83 | goto end_of_export;
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| 84 | len += ret;
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| 85 |
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| 86 | /* Export N */
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| 87 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, NULL, NULL, NULL ) ) != 0 ||
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| 88 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
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| 89 | goto end_of_export;
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| 90 | len += ret;
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| 91 |
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| 92 | end_of_export:
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| 93 |
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| 94 | mbedtls_mpi_free( &T );
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| 95 | if( ret < 0 )
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| 96 | return( ret );
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| 97 |
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| 98 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 99 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
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| 100 | MBEDTLS_ASN1_SEQUENCE ) );
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| 101 |
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| 102 | return( (int) len );
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| 103 | }
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| 104 | #endif /* MBEDTLS_RSA_C */
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| 105 |
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| 106 | #if defined(MBEDTLS_ECP_C)
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| 107 | /*
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| 108 | * EC public key is an EC point
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| 109 | */
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| 110 | static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
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| 111 | mbedtls_ecp_keypair *ec )
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| 112 | {
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| 113 | int ret;
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| 114 | size_t len = 0;
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| 115 | unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
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| 116 |
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| 117 | if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
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| 118 | MBEDTLS_ECP_PF_UNCOMPRESSED,
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| 119 | &len, buf, sizeof( buf ) ) ) != 0 )
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| 120 | {
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| 121 | return( ret );
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| 122 | }
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| 123 |
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| 124 | if( *p < start || (size_t)( *p - start ) < len )
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| 125 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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| 126 |
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| 127 | *p -= len;
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| 128 | memcpy( *p, buf, len );
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| 129 |
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| 130 | return( (int) len );
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| 131 | }
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| 132 |
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| 133 | /*
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| 134 | * ECParameters ::= CHOICE {
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| 135 | * namedCurve OBJECT IDENTIFIER
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| 136 | * }
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| 137 | */
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| 138 | static int pk_write_ec_param( unsigned char **p, unsigned char *start,
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| 139 | mbedtls_ecp_keypair *ec )
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| 140 | {
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| 141 | int ret;
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| 142 | size_t len = 0;
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| 143 | const char *oid;
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| 144 | size_t oid_len;
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| 145 |
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| 146 | if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
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| 147 | return( ret );
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| 148 |
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| 149 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
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| 150 |
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| 151 | return( (int) len );
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| 152 | }
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| 153 | #endif /* MBEDTLS_ECP_C */
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| 154 |
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| 155 | int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
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| 156 | const mbedtls_pk_context *key )
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| 157 | {
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| 158 | int ret;
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| 159 | size_t len = 0;
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| 160 |
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| 161 | PK_VALIDATE_RET( p != NULL );
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| 162 | PK_VALIDATE_RET( *p != NULL );
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| 163 | PK_VALIDATE_RET( start != NULL );
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| 164 | PK_VALIDATE_RET( key != NULL );
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| 165 |
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| 166 | #if defined(MBEDTLS_RSA_C)
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| 167 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
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| 168 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
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| 169 | else
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| 170 | #endif
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| 171 | #if defined(MBEDTLS_ECP_C)
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| 172 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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| 173 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
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| 174 | else
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| 175 | #endif
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| 176 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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| 177 |
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| 178 | return( (int) len );
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| 179 | }
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| 180 |
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| 181 | int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
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| 182 | {
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| 183 | int ret;
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| 184 | unsigned char *c;
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| 185 | size_t len = 0, par_len = 0, oid_len;
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| 186 | const char *oid;
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| 187 |
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| 188 | PK_VALIDATE_RET( key != NULL );
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| 189 | if( size == 0 )
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| 190 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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| 191 | PK_VALIDATE_RET( buf != NULL );
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| 192 |
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| 193 | c = buf + size;
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| 194 |
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| 195 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
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| 196 |
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| 197 | if( c - buf < 1 )
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| 198 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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| 199 |
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| 200 | /*
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| 201 | * SubjectPublicKeyInfo ::= SEQUENCE {
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| 202 | * algorithm AlgorithmIdentifier,
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| 203 | * subjectPublicKey BIT STRING }
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| 204 | */
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| 205 | *--c = 0;
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| 206 | len += 1;
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| 207 |
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| 208 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 209 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
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| 210 |
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| 211 | if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
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| 212 | &oid, &oid_len ) ) != 0 )
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| 213 | {
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| 214 | return( ret );
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| 215 | }
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| 216 |
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| 217 | #if defined(MBEDTLS_ECP_C)
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| 218 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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| 219 | {
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| 220 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
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| 221 | }
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| 222 | #endif
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| 223 |
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| 224 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
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| 225 | par_len ) );
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| 226 |
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| 227 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 228 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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| 229 | MBEDTLS_ASN1_SEQUENCE ) );
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| 230 |
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| 231 | return( (int) len );
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| 232 | }
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| 233 |
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| 234 | int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
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| 235 | {
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| 236 | int ret;
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| 237 | unsigned char *c;
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| 238 | size_t len = 0;
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| 239 |
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| 240 | PK_VALIDATE_RET( key != NULL );
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| 241 | if( size == 0 )
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| 242 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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| 243 | PK_VALIDATE_RET( buf != NULL );
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| 244 |
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| 245 | c = buf + size;
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| 246 |
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| 247 | #if defined(MBEDTLS_RSA_C)
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| 248 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
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| 249 | {
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| 250 | mbedtls_mpi T; /* Temporary holding the exported parameters */
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| 251 | mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
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| 252 |
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| 253 | /*
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| 254 | * Export the parameters one after another to avoid simultaneous copies.
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| 255 | */
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| 256 |
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| 257 | mbedtls_mpi_init( &T );
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| 258 |
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| 259 | /* Export QP */
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| 260 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, NULL, &T ) ) != 0 ||
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| 261 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 262 | goto end_of_export;
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| 263 | len += ret;
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| 264 |
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| 265 | /* Export DQ */
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| 266 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, &T, NULL ) ) != 0 ||
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| 267 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 268 | goto end_of_export;
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| 269 | len += ret;
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| 270 |
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| 271 | /* Export DP */
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| 272 | if( ( ret = mbedtls_rsa_export_crt( rsa, &T, NULL, NULL ) ) != 0 ||
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| 273 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 274 | goto end_of_export;
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| 275 | len += ret;
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| 276 |
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| 277 | /* Export Q */
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| 278 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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| 279 | &T, NULL, NULL ) ) != 0 ||
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| 280 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 281 | goto end_of_export;
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| 282 | len += ret;
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| 283 |
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| 284 | /* Export P */
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| 285 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, &T,
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| 286 | NULL, NULL, NULL ) ) != 0 ||
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| 287 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 288 | goto end_of_export;
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| 289 | len += ret;
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| 290 |
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| 291 | /* Export D */
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| 292 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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| 293 | NULL, &T, NULL ) ) != 0 ||
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| 294 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 295 | goto end_of_export;
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| 296 | len += ret;
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| 297 |
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| 298 | /* Export E */
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| 299 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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| 300 | NULL, NULL, &T ) ) != 0 ||
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| 301 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 302 | goto end_of_export;
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| 303 | len += ret;
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| 304 |
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| 305 | /* Export N */
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| 306 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL,
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| 307 | NULL, NULL, NULL ) ) != 0 ||
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| 308 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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| 309 | goto end_of_export;
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| 310 | len += ret;
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| 311 |
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| 312 | end_of_export:
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| 313 |
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| 314 | mbedtls_mpi_free( &T );
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| 315 | if( ret < 0 )
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| 316 | return( ret );
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| 317 |
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| 318 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
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| 319 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 320 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c,
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| 321 | buf, MBEDTLS_ASN1_CONSTRUCTED |
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| 322 | MBEDTLS_ASN1_SEQUENCE ) );
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| 323 | }
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| 324 | else
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| 325 | #endif /* MBEDTLS_RSA_C */
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| 326 | #if defined(MBEDTLS_ECP_C)
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| 327 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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| 328 | {
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| 329 | mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
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| 330 | size_t pub_len = 0, par_len = 0;
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| 331 |
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| 332 | /*
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| 333 | * RFC 5915, or SEC1 Appendix C.4
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| 334 | *
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| 335 | * ECPrivateKey ::= SEQUENCE {
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| 336 | * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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| 337 | * privateKey OCTET STRING,
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| 338 | * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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| 339 | * publicKey [1] BIT STRING OPTIONAL
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| 340 | * }
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| 341 | */
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| 342 |
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| 343 | /* publicKey */
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| 344 | MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
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| 345 |
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| 346 | if( c - buf < 1 )
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| 347 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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| 348 | *--c = 0;
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| 349 | pub_len += 1;
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| 350 |
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| 351 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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| 352 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
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| 353 |
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| 354 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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| 355 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
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| 356 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
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| 357 | len += pub_len;
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| 358 |
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| 359 | /* parameters */
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| 360 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
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| 361 |
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| 362 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
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| 363 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
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| 364 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
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| 365 | len += par_len;
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| 366 |
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| 367 | /* privateKey: write as MPI then fix tag */
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| 368 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
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| 369 | *c = MBEDTLS_ASN1_OCTET_STRING;
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| 370 |
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| 371 | /* version */
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| 372 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
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| 373 |
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| 374 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 375 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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| 376 | MBEDTLS_ASN1_SEQUENCE ) );
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| 377 | }
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| 378 | else
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| 379 | #endif /* MBEDTLS_ECP_C */
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| 380 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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| 381 |
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| 382 | return( (int) len );
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| 383 | }
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| 384 |
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| 385 | #if defined(MBEDTLS_PEM_WRITE_C)
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| 386 |
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| 387 | #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
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| 388 | #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
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| 389 |
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| 390 | #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
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| 391 | #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
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| 392 | #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
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| 393 | #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
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| 394 |
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| 395 | /*
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| 396 | * Max sizes of key per types. Shown as tag + len (+ content).
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| 397 | */
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| 398 |
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| 399 | #if defined(MBEDTLS_RSA_C)
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| 400 | /*
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| 401 | * RSA public keys:
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| 402 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
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| 403 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
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| 404 | * + 1 + 1 + 9 (rsa oid)
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| 405 | * + 1 + 1 (params null)
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| 406 | * subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
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| 407 | * RSAPublicKey ::= SEQUENCE { 1 + 3
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| 408 | * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
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| 409 | * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
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| 410 | * }
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| 411 | */
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| 412 | #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
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| 413 |
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| 414 | /*
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| 415 | * RSA private keys:
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| 416 | * RSAPrivateKey ::= SEQUENCE { 1 + 3
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| 417 | * version Version, 1 + 1 + 1
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| 418 | * modulus INTEGER, 1 + 3 + MPI_MAX + 1
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| 419 | * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
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| 420 | * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
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| 421 | * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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| 422 | * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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| 423 | * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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| 424 | * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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| 425 | * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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| 426 | * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
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| 427 | * }
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| 428 | */
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| 429 | #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
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| 430 | MBEDTLS_MPI_MAX_SIZE % 2
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| 431 | #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
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| 432 | + 5 * MPI_MAX_SIZE_2
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| 433 |
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| 434 | #else /* MBEDTLS_RSA_C */
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| 435 |
|
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| 436 | #define RSA_PUB_DER_MAX_BYTES 0
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| 437 | #define RSA_PRV_DER_MAX_BYTES 0
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| 438 |
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| 439 | #endif /* MBEDTLS_RSA_C */
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| 440 |
|
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| 441 | #if defined(MBEDTLS_ECP_C)
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| 442 | /*
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| 443 | * EC public keys:
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| 444 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
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| 445 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence)
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| 446 | * + 1 + 1 + 7 (ec oid)
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| 447 | * + 1 + 1 + 9 (namedCurve oid)
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| 448 | * subjectPublicKey BIT STRING 1 + 2 + 1 [1]
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| 449 | * + 1 (point format) [1]
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| 450 | * + 2 * ECP_MAX (coords) [1]
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| 451 | * }
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| 452 | */
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| 453 | #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
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| 454 |
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| 455 | /*
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| 456 | * EC private keys:
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| 457 | * ECPrivateKey ::= SEQUENCE { 1 + 2
|
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| 458 | * version INTEGER , 1 + 1 + 1
|
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| 459 | * privateKey OCTET STRING, 1 + 1 + ECP_MAX
|
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| 460 | * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
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| 461 | * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
|
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| 462 | * }
|
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| 463 | */
|
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| 464 | #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
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| 465 |
|
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| 466 | #else /* MBEDTLS_ECP_C */
|
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| 467 |
|
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| 468 | #define ECP_PUB_DER_MAX_BYTES 0
|
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| 469 | #define ECP_PRV_DER_MAX_BYTES 0
|
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| 470 |
|
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| 471 | #endif /* MBEDTLS_ECP_C */
|
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| 472 |
|
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| 473 | #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
|
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| 474 | RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
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| 475 | #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
|
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| 476 | RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
|
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| 477 |
|
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| 478 | int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
|
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| 479 | {
|
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| 480 | int ret;
|
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| 481 | unsigned char output_buf[PUB_DER_MAX_BYTES];
|
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| 482 | size_t olen = 0;
|
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| 483 |
|
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| 484 | PK_VALIDATE_RET( key != NULL );
|
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| 485 | PK_VALIDATE_RET( buf != NULL || size == 0 );
|
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| 486 |
|
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| 487 | if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
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| 488 | sizeof(output_buf) ) ) < 0 )
|
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| 489 | {
|
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| 490 | return( ret );
|
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| 491 | }
|
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| 492 |
|
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| 493 | if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
|
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| 494 | output_buf + sizeof(output_buf) - ret,
|
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| 495 | ret, buf, size, &olen ) ) != 0 )
|
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| 496 | {
|
---|
| 497 | return( ret );
|
---|
| 498 | }
|
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| 499 |
|
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| 500 | return( 0 );
|
---|
| 501 | }
|
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| 502 |
|
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| 503 | int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
|
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| 504 | {
|
---|
| 505 | int ret;
|
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| 506 | unsigned char output_buf[PRV_DER_MAX_BYTES];
|
---|
| 507 | const char *begin, *end;
|
---|
| 508 | size_t olen = 0;
|
---|
| 509 |
|
---|
| 510 | PK_VALIDATE_RET( key != NULL );
|
---|
| 511 | PK_VALIDATE_RET( buf != NULL || size == 0 );
|
---|
| 512 |
|
---|
| 513 | if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
|
---|
| 514 | return( ret );
|
---|
| 515 |
|
---|
| 516 | #if defined(MBEDTLS_RSA_C)
|
---|
| 517 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
|
---|
| 518 | {
|
---|
| 519 | begin = PEM_BEGIN_PRIVATE_KEY_RSA;
|
---|
| 520 | end = PEM_END_PRIVATE_KEY_RSA;
|
---|
| 521 | }
|
---|
| 522 | else
|
---|
| 523 | #endif
|
---|
| 524 | #if defined(MBEDTLS_ECP_C)
|
---|
| 525 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
|
---|
| 526 | {
|
---|
| 527 | begin = PEM_BEGIN_PRIVATE_KEY_EC;
|
---|
| 528 | end = PEM_END_PRIVATE_KEY_EC;
|
---|
| 529 | }
|
---|
| 530 | else
|
---|
| 531 | #endif
|
---|
| 532 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
---|
| 533 |
|
---|
| 534 | if( ( ret = mbedtls_pem_write_buffer( begin, end,
|
---|
| 535 | output_buf + sizeof(output_buf) - ret,
|
---|
| 536 | ret, buf, size, &olen ) ) != 0 )
|
---|
| 537 | {
|
---|
| 538 | return( ret );
|
---|
| 539 | }
|
---|
| 540 |
|
---|
| 541 | return( 0 );
|
---|
| 542 | }
|
---|
| 543 | #endif /* MBEDTLS_PEM_WRITE_C */
|
---|
| 544 |
|
---|
| 545 | #endif /* MBEDTLS_PK_WRITE_C */
|
---|