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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 8774 | rgimad | 1 | /* |
| 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: GPL-2.0 |
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| 6 | * |
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| 7 | * This program is free software; you can redistribute it and/or modify |
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| 8 | * it under the terms of the GNU General Public License as published by |
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| 9 | * the Free Software Foundation; either version 2 of the License, or |
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| 10 | * (at your option) any later version. |
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| 11 | * |
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| 12 | * This program is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | * GNU General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU General Public License along |
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| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
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| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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| 20 | * |
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| 21 | * This file is part of mbed TLS (https://tls.mbed.org) |
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| 22 | */ |
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| 23 | |||
| 24 | #if !defined(MBEDTLS_CONFIG_FILE) |
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| 25 | #include "mbedtls/config.h" |
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| 26 | #else |
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| 27 | #include MBEDTLS_CONFIG_FILE |
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| 28 | #endif |
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| 29 | |||
| 30 | #if defined(MBEDTLS_PK_WRITE_C) |
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| 31 | |||
| 32 | #include "mbedtls/pk.h" |
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| 33 | #include "mbedtls/asn1write.h" |
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| 34 | #include "mbedtls/oid.h" |
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| 35 | #include "mbedtls/platform_util.h" |
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| 36 | |||
| 37 | #include |
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| 38 | |||
| 39 | #if defined(MBEDTLS_RSA_C) |
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| 40 | #include "mbedtls/rsa.h" |
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| 41 | #endif |
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| 42 | #if defined(MBEDTLS_ECP_C) |
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| 43 | #include "mbedtls/bignum.h" |
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| 44 | #include "mbedtls/ecp.h" |
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| 45 | #include "mbedtls/platform_util.h" |
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| 46 | #endif |
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| 47 | #if defined(MBEDTLS_ECDSA_C) |
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| 48 | #include "mbedtls/ecdsa.h" |
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| 49 | #endif |
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| 50 | #if defined(MBEDTLS_PEM_WRITE_C) |
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| 51 | #include "mbedtls/pem.h" |
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| 52 | #endif |
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| 53 | |||
| 54 | #if defined(MBEDTLS_PLATFORM_C) |
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| 55 | #include "mbedtls/platform.h" |
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| 56 | #else |
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| 57 | #include |
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| 58 | #define mbedtls_calloc calloc |
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| 59 | #define mbedtls_free free |
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| 60 | #endif |
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| 61 | |||
| 62 | /* Parameter validation macros based on platform_util.h */ |
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| 63 | #define PK_VALIDATE_RET( cond ) \ |
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| 64 | MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA ) |
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| 65 | #define PK_VALIDATE( cond ) \ |
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| 66 | MBEDTLS_INTERNAL_VALIDATE( cond ) |
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| 67 | |||
| 68 | #if defined(MBEDTLS_RSA_C) |
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| 69 | /* |
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| 70 | * RSAPublicKey ::= SEQUENCE { |
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| 71 | * modulus INTEGER, -- n |
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| 72 | * publicExponent INTEGER -- e |
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| 73 | * } |
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| 74 | */ |
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| 75 | static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start, |
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| 76 | mbedtls_rsa_context *rsa ) |
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| 77 | { |
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| 78 | int ret; |
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| 79 | size_t len = 0; |
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| 80 | mbedtls_mpi T; |
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| 81 | |||
| 82 | mbedtls_mpi_init( &T ); |
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| 83 | |||
| 84 | /* Export E */ |
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| 85 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &T ) ) != 0 || |
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| 86 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 ) |
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| 87 | goto end_of_export; |
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| 88 | len += ret; |
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| 89 | |||
| 90 | /* Export N */ |
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| 91 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, NULL, NULL, NULL ) ) != 0 || |
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| 92 | ( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 ) |
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| 93 | goto end_of_export; |
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| 94 | len += ret; |
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| 95 | |||
| 96 | end_of_export: |
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| 97 | |||
| 98 | mbedtls_mpi_free( &T ); |
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| 99 | if( ret < 0 ) |
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| 100 | return( ret ); |
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| 101 | |||
| 102 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); |
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| 103 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED | |
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| 104 | MBEDTLS_ASN1_SEQUENCE ) ); |
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| 105 | |||
| 106 | return( (int) len ); |
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| 107 | } |
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| 108 | #endif /* MBEDTLS_RSA_C */ |
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| 109 | |||
| 110 | #if defined(MBEDTLS_ECP_C) |
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| 111 | /* |
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| 112 | * EC public key is an EC point |
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| 113 | */ |
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| 114 | static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start, |
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| 115 | mbedtls_ecp_keypair *ec ) |
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| 116 | { |
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| 117 | int ret; |
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| 118 | size_t len = 0; |
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| 119 | unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN]; |
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| 120 | |||
| 121 | if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q, |
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| 122 | MBEDTLS_ECP_PF_UNCOMPRESSED, |
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| 123 | &len, buf, sizeof( buf ) ) ) != 0 ) |
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| 124 | { |
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| 125 | return( ret ); |
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| 126 | } |
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| 127 | |||
| 128 | if( *p < start || (size_t)( *p - start ) < len ) |
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| 129 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
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| 130 | |||
| 131 | *p -= len; |
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| 132 | memcpy( *p, buf, len ); |
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| 133 | |||
| 134 | return( (int) len ); |
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| 135 | } |
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| 136 | |||
| 137 | /* |
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| 138 | * ECParameters ::= CHOICE { |
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| 139 | * namedCurve OBJECT IDENTIFIER |
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| 140 | * } |
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| 141 | */ |
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| 142 | static int pk_write_ec_param( unsigned char **p, unsigned char *start, |
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| 143 | mbedtls_ecp_keypair *ec ) |
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| 144 | { |
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| 145 | int ret; |
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| 146 | size_t len = 0; |
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| 147 | const char *oid; |
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| 148 | size_t oid_len; |
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| 149 | |||
| 150 | if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 ) |
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| 151 | return( ret ); |
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| 152 | |||
| 153 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) ); |
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| 154 | |||
| 155 | return( (int) len ); |
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| 156 | } |
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| 157 | |||
| 158 | /* |
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| 159 | * privateKey OCTET STRING -- always of length ceil(log2(n)/8) |
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| 160 | */ |
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| 161 | static int pk_write_ec_private( unsigned char **p, unsigned char *start, |
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| 162 | mbedtls_ecp_keypair *ec ) |
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| 163 | { |
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| 164 | int ret; |
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| 165 | size_t byte_length = ( ec->grp.pbits + 7 ) / 8; |
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| 166 | unsigned char tmp[MBEDTLS_ECP_MAX_BYTES]; |
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| 167 | |||
| 168 | ret = mbedtls_mpi_write_binary( &ec->d, tmp, byte_length ); |
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| 169 | if( ret != 0 ) |
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| 170 | goto exit; |
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| 171 | ret = mbedtls_asn1_write_octet_string( p, start, tmp, byte_length ); |
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| 172 | |||
| 173 | exit: |
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| 174 | mbedtls_platform_zeroize( tmp, byte_length ); |
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| 175 | return( ret ); |
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| 176 | } |
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| 177 | #endif /* MBEDTLS_ECP_C */ |
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| 178 | |||
| 179 | int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start, |
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| 180 | const mbedtls_pk_context *key ) |
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| 181 | { |
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| 182 | int ret; |
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| 183 | size_t len = 0; |
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| 184 | |||
| 185 | PK_VALIDATE_RET( p != NULL ); |
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| 186 | PK_VALIDATE_RET( *p != NULL ); |
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| 187 | PK_VALIDATE_RET( start != NULL ); |
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| 188 | PK_VALIDATE_RET( key != NULL ); |
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| 189 | |||
| 190 | #if defined(MBEDTLS_RSA_C) |
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| 191 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA ) |
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| 192 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) ); |
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| 193 | else |
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| 194 | #endif |
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| 195 | #if defined(MBEDTLS_ECP_C) |
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| 196 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
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| 197 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) ); |
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| 198 | else |
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| 199 | #endif |
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| 200 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
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| 201 | |||
| 202 | return( (int) len ); |
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| 203 | } |
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| 204 | |||
| 205 | int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
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| 206 | { |
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| 207 | int ret; |
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| 208 | unsigned char *c; |
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| 209 | size_t len = 0, par_len = 0, oid_len; |
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| 210 | const char *oid; |
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| 211 | |||
| 212 | PK_VALIDATE_RET( key != NULL ); |
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| 213 | if( size == 0 ) |
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| 214 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
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| 215 | PK_VALIDATE_RET( buf != NULL ); |
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| 216 | |||
| 217 | c = buf + size; |
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| 218 | |||
| 219 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) ); |
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| 220 | |||
| 221 | if( c - buf < 1 ) |
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| 222 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
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| 223 | |||
| 224 | /* |
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| 225 | * SubjectPublicKeyInfo ::= SEQUENCE { |
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| 226 | * algorithm AlgorithmIdentifier, |
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| 227 | * subjectPublicKey BIT STRING } |
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| 228 | */ |
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| 229 | *--c = 0; |
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| 230 | len += 1; |
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| 231 | |||
| 232 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
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| 233 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) ); |
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| 234 | |||
| 235 | if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ), |
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| 236 | &oid, &oid_len ) ) != 0 ) |
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| 237 | { |
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| 238 | return( ret ); |
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| 239 | } |
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| 240 | |||
| 241 | #if defined(MBEDTLS_ECP_C) |
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| 242 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
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| 243 | { |
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| 244 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) ); |
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| 245 | } |
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| 246 | #endif |
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| 247 | |||
| 248 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len, |
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| 249 | par_len ) ); |
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| 250 | |||
| 251 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
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| 252 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED | |
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| 253 | MBEDTLS_ASN1_SEQUENCE ) ); |
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| 254 | |||
| 255 | return( (int) len ); |
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| 256 | } |
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| 257 | |||
| 258 | int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
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| 259 | { |
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| 260 | int ret; |
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| 261 | unsigned char *c; |
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| 262 | size_t len = 0; |
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| 263 | |||
| 264 | PK_VALIDATE_RET( key != NULL ); |
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| 265 | if( size == 0 ) |
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| 266 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
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| 267 | PK_VALIDATE_RET( buf != NULL ); |
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| 268 | |||
| 269 | c = buf + size; |
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| 270 | |||
| 271 | #if defined(MBEDTLS_RSA_C) |
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| 272 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA ) |
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| 273 | { |
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| 274 | mbedtls_mpi T; /* Temporary holding the exported parameters */ |
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| 275 | mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key ); |
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| 276 | |||
| 277 | /* |
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| 278 | * Export the parameters one after another to avoid simultaneous copies. |
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| 279 | */ |
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| 280 | |||
| 281 | mbedtls_mpi_init( &T ); |
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| 282 | |||
| 283 | /* Export QP */ |
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| 284 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, NULL, &T ) ) != 0 || |
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| 285 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 286 | goto end_of_export; |
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| 287 | len += ret; |
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| 288 | |||
| 289 | /* Export DQ */ |
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| 290 | if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, &T, NULL ) ) != 0 || |
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| 291 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 292 | goto end_of_export; |
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| 293 | len += ret; |
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| 294 | |||
| 295 | /* Export DP */ |
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| 296 | if( ( ret = mbedtls_rsa_export_crt( rsa, &T, NULL, NULL ) ) != 0 || |
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| 297 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 298 | goto end_of_export; |
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| 299 | len += ret; |
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| 300 | |||
| 301 | /* Export Q */ |
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| 302 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, |
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| 303 | &T, NULL, NULL ) ) != 0 || |
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| 304 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 305 | goto end_of_export; |
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| 306 | len += ret; |
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| 307 | |||
| 308 | /* Export P */ |
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| 309 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, &T, |
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| 310 | NULL, NULL, NULL ) ) != 0 || |
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| 311 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 312 | goto end_of_export; |
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| 313 | len += ret; |
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| 314 | |||
| 315 | /* Export D */ |
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| 316 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, |
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| 317 | NULL, &T, NULL ) ) != 0 || |
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| 318 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 319 | goto end_of_export; |
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| 320 | len += ret; |
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| 321 | |||
| 322 | /* Export E */ |
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| 323 | if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, |
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| 324 | NULL, NULL, &T ) ) != 0 || |
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| 325 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 326 | goto end_of_export; |
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| 327 | len += ret; |
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| 328 | |||
| 329 | /* Export N */ |
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| 330 | if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, |
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| 331 | NULL, NULL, NULL ) ) != 0 || |
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| 332 | ( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 ) |
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| 333 | goto end_of_export; |
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| 334 | len += ret; |
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| 335 | |||
| 336 | end_of_export: |
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| 337 | |||
| 338 | mbedtls_mpi_free( &T ); |
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| 339 | if( ret < 0 ) |
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| 340 | return( ret ); |
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| 341 | |||
| 342 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) ); |
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| 343 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
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| 344 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, |
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| 345 | buf, MBEDTLS_ASN1_CONSTRUCTED | |
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| 346 | MBEDTLS_ASN1_SEQUENCE ) ); |
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| 347 | } |
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| 348 | else |
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| 349 | #endif /* MBEDTLS_RSA_C */ |
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| 350 | #if defined(MBEDTLS_ECP_C) |
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| 351 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
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| 352 | { |
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| 353 | mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key ); |
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| 354 | size_t pub_len = 0, par_len = 0; |
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| 355 | |||
| 356 | /* |
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| 357 | * RFC 5915, or SEC1 Appendix C.4 |
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| 358 | * |
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| 359 | * ECPrivateKey ::= SEQUENCE { |
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| 360 | * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), |
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| 361 | * privateKey OCTET STRING, |
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| 362 | * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL, |
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| 363 | * publicKey [1] BIT STRING OPTIONAL |
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| 364 | * } |
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| 365 | */ |
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| 366 | |||
| 367 | /* publicKey */ |
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| 368 | MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) ); |
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| 369 | |||
| 370 | if( c - buf < 1 ) |
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| 371 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); |
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| 372 | *--c = 0; |
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| 373 | pub_len += 1; |
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| 374 | |||
| 375 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) ); |
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| 376 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) ); |
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| 377 | |||
| 378 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) ); |
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| 379 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, |
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| 380 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ); |
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| 381 | len += pub_len; |
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| 382 | |||
| 383 | /* parameters */ |
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| 384 | MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) ); |
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| 385 | |||
| 386 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) ); |
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| 387 | MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf, |
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| 388 | MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ); |
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| 389 | len += par_len; |
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| 390 | |||
| 391 | /* privateKey */ |
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| 392 | MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_private( &c, buf, ec ) ); |
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| 393 | |||
| 394 | /* version */ |
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| 395 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) ); |
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| 396 | |||
| 397 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); |
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| 398 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED | |
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| 399 | MBEDTLS_ASN1_SEQUENCE ) ); |
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| 400 | } |
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| 401 | else |
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| 402 | #endif /* MBEDTLS_ECP_C */ |
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| 403 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
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| 404 | |||
| 405 | return( (int) len ); |
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| 406 | } |
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| 407 | |||
| 408 | #if defined(MBEDTLS_PEM_WRITE_C) |
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| 409 | |||
| 410 | #define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n" |
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| 411 | #define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n" |
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| 412 | |||
| 413 | #define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n" |
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| 414 | #define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n" |
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| 415 | #define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n" |
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| 416 | #define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n" |
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| 417 | |||
| 418 | /* |
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| 419 | * Max sizes of key per types. Shown as tag + len (+ content). |
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| 420 | */ |
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| 421 | |||
| 422 | #if defined(MBEDTLS_RSA_C) |
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| 423 | /* |
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| 424 | * RSA public keys: |
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| 425 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3 |
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| 426 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence) |
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| 427 | * + 1 + 1 + 9 (rsa oid) |
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| 428 | * + 1 + 1 (params null) |
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| 429 | * subjectPublicKey BIT STRING } 1 + 3 + (1 + below) |
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| 430 | * RSAPublicKey ::= SEQUENCE { 1 + 3 |
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| 431 | * modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1 |
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| 432 | * publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1 |
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| 433 | * } |
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| 434 | */ |
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| 435 | #define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE |
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| 436 | |||
| 437 | /* |
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| 438 | * RSA private keys: |
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| 439 | * RSAPrivateKey ::= SEQUENCE { 1 + 3 |
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| 440 | * version Version, 1 + 1 + 1 |
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| 441 | * modulus INTEGER, 1 + 3 + MPI_MAX + 1 |
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| 442 | * publicExponent INTEGER, 1 + 3 + MPI_MAX + 1 |
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| 443 | * privateExponent INTEGER, 1 + 3 + MPI_MAX + 1 |
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| 444 | * prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
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| 445 | * prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
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| 446 | * exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
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| 447 | * exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
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| 448 | * coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1 |
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| 449 | * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported) |
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| 450 | * } |
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| 451 | */ |
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| 452 | #define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \ |
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| 453 | MBEDTLS_MPI_MAX_SIZE % 2 |
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| 454 | #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \ |
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| 455 | + 5 * MPI_MAX_SIZE_2 |
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| 456 | |||
| 457 | #else /* MBEDTLS_RSA_C */ |
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| 458 | |||
| 459 | #define RSA_PUB_DER_MAX_BYTES 0 |
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| 460 | #define RSA_PRV_DER_MAX_BYTES 0 |
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| 461 | |||
| 462 | #endif /* MBEDTLS_RSA_C */ |
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| 463 | |||
| 464 | #if defined(MBEDTLS_ECP_C) |
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| 465 | /* |
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| 466 | * EC public keys: |
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| 467 | * SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2 |
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| 468 | * algorithm AlgorithmIdentifier, 1 + 1 (sequence) |
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| 469 | * + 1 + 1 + 7 (ec oid) |
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| 470 | * + 1 + 1 + 9 (namedCurve oid) |
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| 471 | * subjectPublicKey BIT STRING 1 + 2 + 1 [1] |
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| 472 | * + 1 (point format) [1] |
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| 473 | * + 2 * ECP_MAX (coords) [1] |
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| 474 | * } |
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| 475 | */ |
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| 476 | #define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES |
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| 477 | |||
| 478 | /* |
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| 479 | * EC private keys: |
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| 480 | * ECPrivateKey ::= SEQUENCE { 1 + 2 |
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| 481 | * version INTEGER , 1 + 1 + 1 |
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| 482 | * privateKey OCTET STRING, 1 + 1 + ECP_MAX |
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| 483 | * parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9) |
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| 484 | * publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above |
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| 485 | * } |
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| 486 | */ |
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| 487 | #define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES |
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| 488 | |||
| 489 | #else /* MBEDTLS_ECP_C */ |
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| 490 | |||
| 491 | #define ECP_PUB_DER_MAX_BYTES 0 |
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| 492 | #define ECP_PRV_DER_MAX_BYTES 0 |
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| 493 | |||
| 494 | #endif /* MBEDTLS_ECP_C */ |
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| 495 | |||
| 496 | #define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \ |
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| 497 | RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES |
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| 498 | #define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \ |
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| 499 | RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES |
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| 500 | |||
| 501 | int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
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| 502 | { |
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| 503 | int ret; |
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| 504 | unsigned char output_buf[PUB_DER_MAX_BYTES]; |
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| 505 | size_t olen = 0; |
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| 506 | |||
| 507 | PK_VALIDATE_RET( key != NULL ); |
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| 508 | PK_VALIDATE_RET( buf != NULL || size == 0 ); |
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| 509 | |||
| 510 | if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf, |
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| 511 | sizeof(output_buf) ) ) < 0 ) |
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| 512 | { |
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| 513 | return( ret ); |
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| 514 | } |
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| 515 | |||
| 516 | if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY, |
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| 517 | output_buf + sizeof(output_buf) - ret, |
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| 518 | ret, buf, size, &olen ) ) != 0 ) |
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| 519 | { |
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| 520 | return( ret ); |
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| 521 | } |
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| 522 | |||
| 523 | return( 0 ); |
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| 524 | } |
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| 525 | |||
| 526 | int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size ) |
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| 527 | { |
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| 528 | int ret; |
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| 529 | unsigned char output_buf[PRV_DER_MAX_BYTES]; |
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| 530 | const char *begin, *end; |
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| 531 | size_t olen = 0; |
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| 532 | |||
| 533 | PK_VALIDATE_RET( key != NULL ); |
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| 534 | PK_VALIDATE_RET( buf != NULL || size == 0 ); |
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| 535 | |||
| 536 | if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 ) |
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| 537 | return( ret ); |
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| 538 | |||
| 539 | #if defined(MBEDTLS_RSA_C) |
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| 540 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA ) |
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| 541 | { |
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| 542 | begin = PEM_BEGIN_PRIVATE_KEY_RSA; |
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| 543 | end = PEM_END_PRIVATE_KEY_RSA; |
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| 544 | } |
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| 545 | else |
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| 546 | #endif |
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| 547 | #if defined(MBEDTLS_ECP_C) |
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| 548 | if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY ) |
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| 549 | { |
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| 550 | begin = PEM_BEGIN_PRIVATE_KEY_EC; |
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| 551 | end = PEM_END_PRIVATE_KEY_EC; |
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| 552 | } |
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| 553 | else |
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| 554 | #endif |
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| 555 | return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE ); |
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| 556 | |||
| 557 | if( ( ret = mbedtls_pem_write_buffer( begin, end, |
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| 558 | output_buf + sizeof(output_buf) - ret, |
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| 559 | ret, buf, size, &olen ) ) != 0 ) |
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| 560 | { |
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| 561 | return( ret ); |
||
| 562 | } |
||
| 563 | |||
| 564 | return( 0 ); |
||
| 565 | } |
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| 566 | #endif /* MBEDTLS_PEM_WRITE_C */ |
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| 567 | |||
| 568 | #endif /* MBEDTLS_PK_WRITE_C */ |