805 lines
28 KiB
C
805 lines
28 KiB
C
/*
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* Public Key layer for writing key files and structures
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PK_WRITE_C)
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#include "mbedtls/pk.h"
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#include "mbedtls/asn1write.h"
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#include "mbedtls/oid.h"
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#include <string.h>
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#if defined(MBEDTLS_RSA_C)
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#include "mbedtls/rsa.h"
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#endif
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#if defined(MBEDTLS_ECP_C)
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#include "mbedtls/ecp.h"
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#endif
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#if defined(MBEDTLS_ECDSA_C)
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#include "mbedtls/ecdsa.h"
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#endif
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#if defined(MBEDTLS_PEM_WRITE_C)
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#include "mbedtls/pem.h"
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#endif
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#if defined(MBEDTLS_PKCS5_C)
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#include "mbedtls/pkcs5.h"
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#endif
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#if defined(MBEDTLS_PKCS12_C)
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#include "mbedtls/pkcs12.h"
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#endif
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#if defined(MBEDTLS_FAST_EC_C)
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#include "mbedtls/fast_ec.h"
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdlib.h>
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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#if defined(MBEDTLS_RSA_C)
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/*
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* RSAPublicKey ::= SEQUENCE {
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* modulus INTEGER, -- n
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* publicExponent INTEGER -- e
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* }
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*/
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static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
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mbedtls_rsa_context *rsa )
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{
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int ret;
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size_t len = 0;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->E ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( p, start, &rsa->N ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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return( (int) len );
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}
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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/*
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* EC public key is an EC point
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*/
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static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
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mbedtls_ecp_keypair *ec )
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{
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int ret;
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size_t len = 0;
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unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
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if( ( ret = mbedtls_ecp_point_write_binary( &ec->grp, &ec->Q,
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MBEDTLS_ECP_PF_UNCOMPRESSED,
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&len, buf, sizeof( buf ) ) ) != 0 )
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{
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return( ret );
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}
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if( *p < start || (size_t)( *p - start ) < len )
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return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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*p -= len;
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memcpy( *p, buf, len );
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return( (int) len );
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}
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/*
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* ECParameters ::= CHOICE {
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* namedCurve OBJECT IDENTIFIER
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* }
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*/
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static int pk_write_ec_param( unsigned char **p, unsigned char *start,
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mbedtls_ecp_keypair *ec )
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{
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int ret;
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size_t len = 0;
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const char *oid;
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size_t oid_len;
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if( ( ret = mbedtls_oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
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return( ret );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
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return( (int) len );
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}
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#endif /* MBEDTLS_ECP_C */
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#if defined(MBEDTLS_FAST_EC_C)
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static int pk_write_fast_ec_pubkey( unsigned char **p, unsigned char *start,
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mbedtls_fast_ec_keypair_t *fast_ec )
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{
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int ret;
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size_t len = 0;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer(
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p, start, fast_ec->public_key, mbedtls_fast_ec_get_key_len( fast_ec->info ) ) );
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return( (int) len );
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}
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static int pk_write_fast_ec_key( unsigned char **p, unsigned char *start,
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mbedtls_fast_ec_keypair_t *fast_ec )
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{
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int ret;
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size_t len = 0;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_octet_string(
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p, start, fast_ec->private_key, mbedtls_fast_ec_get_key_len( fast_ec->info ) ) );
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return( (int) len );
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}
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#endif /* MBEDTLS_FAST_EC_C */
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int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *key )
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{
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int ret;
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size_t len = 0;
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#if defined(MBEDTLS_RSA_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
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MBEDTLS_ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, mbedtls_pk_rsa( *key ) ) );
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else
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#endif
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#if defined(MBEDTLS_ECP_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
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else
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#endif
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#if defined(MBEDTLS_FAST_EC_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_X25519 || mbedtls_pk_get_type( key ) == MBEDTLS_PK_ED25519 )
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MBEDTLS_ASN1_CHK_ADD( len, pk_write_fast_ec_pubkey( p, start, mbedtls_pk_fast_ec( *key ) ) );
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else
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#endif
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return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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return( (int) len );
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}
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int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
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{
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int ret;
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unsigned char *c;
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size_t len = 0, par_len = 0, oid_len;
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const char *oid;
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c = buf + size;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
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if( c - buf < 1 )
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return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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/*
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT STRING }
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*/
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*--c = 0;
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len += 1;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
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if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
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&oid, &oid_len ) ) != 0 )
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{
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return( ret );
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}
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#if defined(MBEDTLS_ECP_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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{
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MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
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}
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#endif
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#if defined(MBEDTLS_FAST_EC_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_X25519 || mbedtls_pk_get_type( key ) == MBEDTLS_PK_ED25519 )
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{
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier_no_params( &c, buf, oid, oid_len ) );
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} else
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#endif
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
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par_len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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return( (int) len );
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}
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int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_t size )
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{
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int ret;
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unsigned char *c = buf + size;
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size_t len = 0;
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#if defined(MBEDTLS_RSA_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
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{
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mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->QP ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DQ ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DP ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->Q ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->P ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->D ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->E ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->N ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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}
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else
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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{
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mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
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size_t pub_len = 0, par_len = 0;
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/*
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* RFC 5915, or SEC1 Appendix C.4
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*
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* ECPrivateKey ::= SEQUENCE {
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* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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* privateKey OCTET STRING,
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* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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* publicKey [1] BIT STRING OPTIONAL
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* }
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*/
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/* publicKey */
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MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
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if( c - buf < 1 )
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return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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*--c = 0;
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pub_len += 1;
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
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len += pub_len;
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/* parameters */
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MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
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MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_len( &c, buf, par_len ) );
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MBEDTLS_ASN1_CHK_ADD( par_len, mbedtls_asn1_write_tag( &c, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
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len += par_len;
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/* privateKey: write as MPI then fix tag */
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
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*c = MBEDTLS_ASN1_OCTET_STRING;
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/* version */
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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}
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else
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#endif /* MBEDTLS_ECP_C */
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#if defined(MBEDTLS_FAST_EC_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_X25519 || mbedtls_pk_get_type( key ) == MBEDTLS_PK_ED25519 )
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return mbedtls_pk_write_key_pkcs8_der(key, buf, size, NULL, 0, NULL, 0);
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else
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#endif
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return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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return( (int) len );
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}
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#if defined(MBEDTLS_PK_WRITE_PKCS8_C)
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int mbedtls_pk_write_key_pkcs8_der( mbedtls_pk_context *key, unsigned char *buf, size_t size,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *pbe, size_t pbelen )
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{
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int ret;
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unsigned char *c = buf + size;
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size_t len = 0, par_len = 0, oid_len = 0;
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const char *oid;
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#if defined(MBEDTLS_RSA_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
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{
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mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->QP ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DQ ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->DP ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->Q ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->P ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->D ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->E ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &rsa->N ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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}
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else
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
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{
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mbedtls_ecp_keypair *ec = mbedtls_pk_ec( *key );
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size_t pub_len = 0;
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/*
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* RFC 5915, or SEC1 Appendix C.4
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*
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* ECPrivateKey ::= SEQUENCE {
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* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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* privateKey OCTET STRING,
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* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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* publicKey [1] BIT STRING OPTIONAL
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* }
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*/
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/* publicKey */
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MBEDTLS_ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
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if( c - buf < 1 )
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return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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*--c = 0;
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pub_len += 1;
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_BIT_STRING ) );
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_len( &c, buf, pub_len ) );
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_asn1_write_tag( &c, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) );
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len += pub_len;
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/* privateKey: write as MPI then fix tag */
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, &ec->d ) );
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*c = MBEDTLS_ASN1_OCTET_STRING;
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/* version */
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 1 ) );
|
|
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_ECP_C */
|
|
#if defined(MBEDTLS_FAST_EC_C)
|
|
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_X25519 || mbedtls_pk_get_type( key ) == MBEDTLS_PK_ED25519 )
|
|
MBEDTLS_ASN1_CHK_ADD( len, pk_write_fast_ec_key( &c, buf, mbedtls_pk_fast_ec( *key ) ) );
|
|
else
|
|
#endif
|
|
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
|
|
|
/*
|
|
* Write private key to the PrivatKeyInfo object (PKCS#8 v1.2)
|
|
*
|
|
* PrivateKeyInfo ::= SEQUENCE {
|
|
* version Version,
|
|
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
|
|
* privateKey PrivateKey,
|
|
* attributes [0] IMPLICIT Attributes OPTIONAL }
|
|
*
|
|
* Version ::= INTEGER
|
|
* PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
|
|
* PrivateKey ::= OCTET STRING
|
|
*/
|
|
|
|
/* privateKey: mark as octet string */
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OCTET_STRING ) );
|
|
|
|
/* privateKeyAlgorithm */
|
|
if( ( ret = mbedtls_oid_get_oid_by_pk_alg( mbedtls_pk_get_type( key ),
|
|
&oid, &oid_len ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
|
|
{
|
|
MBEDTLS_ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, mbedtls_pk_ec( *key ) ) );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_FAST_EC_C)
|
|
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_X25519 || mbedtls_pk_get_type( key ) == MBEDTLS_PK_ED25519 )
|
|
{
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier_no_params( &c, buf, oid, oid_len ) );
|
|
} else
|
|
#endif
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, buf, oid, oid_len, par_len ) );
|
|
|
|
/* version */
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, 0 ) );
|
|
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
|
|
|
|
/*
|
|
* Encrypt private key and write it to the
|
|
* EncryptedPrivatKeyInfo object (PKCS#8)
|
|
*
|
|
* EncryptedPrivateKeyInfo ::= SEQUENCE {
|
|
* encryptionAlgorithm EncryptionAlgorithmIdentifier,
|
|
* encryptedData EncryptedData
|
|
* }
|
|
*
|
|
* EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
|
|
*
|
|
* EncryptedData ::= OCTET STRING
|
|
*
|
|
* The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
|
|
*/
|
|
if( pwd != NULL && pwdlen > 0 && len > 0)
|
|
{
|
|
mbedtls_cipher_type_t cipher_alg;
|
|
mbedtls_md_type_t md_alg;
|
|
mbedtls_asn1_buf pbe_alg_oid, pbe_params;
|
|
unsigned char *pbe_buf = NULL;
|
|
size_t pbe_out_len = 0;
|
|
unsigned char *pbe_c = (unsigned char *)pbe;
|
|
|
|
#if !defined(MBEDTLS_PKCS12_C) && !defined(MBEDTLS_PKCS5_C)
|
|
((void) pwd);
|
|
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
|
#endif
|
|
|
|
|
|
if( ( ret = mbedtls_asn1_get_alg( &pbe_c, pbe_c + pbelen, &pbe_alg_oid, &pbe_params ) ) != 0 )
|
|
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA + ret );
|
|
|
|
/*
|
|
* Encrypt Data with appropriate PBE
|
|
*/
|
|
pbe_buf = mbedtls_calloc(1, len + MBEDTLS_MAX_BLOCK_LENGTH);
|
|
if (pbe_buf == NULL)
|
|
{
|
|
return MBEDTLS_ERR_PK_ALLOC_FAILED;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PKCS12_C)
|
|
if( mbedtls_oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
|
|
{
|
|
if( ( ret = mbedtls_pkcs12_pbe_ext( &pbe_params, MBEDTLS_PKCS12_PBE_ENCRYPT,
|
|
cipher_alg, md_alg,
|
|
pwd, pwdlen, c, len, pbe_buf, &pbe_out_len ) ) != 0 )
|
|
{
|
|
mbedtls_free( pbe_buf );
|
|
return( ret );
|
|
}
|
|
}
|
|
else if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) == 0 )
|
|
{
|
|
if( ( ret = mbedtls_pkcs12_pbe_sha1_rc4_128( &pbe_params,
|
|
MBEDTLS_PKCS12_PBE_ENCRYPT,
|
|
pwd, pwdlen,
|
|
c, len, pbe_buf ) ) != 0 )
|
|
{
|
|
mbedtls_free( pbe_buf );
|
|
return( ret );
|
|
}
|
|
// RC4: len(output) == len(input)
|
|
pbe_out_len = len;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PKCS12_C */
|
|
#if defined(MBEDTLS_PKCS5_C)
|
|
if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid ) == 0 )
|
|
{
|
|
if( ( ret = mbedtls_pkcs5_pbes2_ext( &pbe_params, MBEDTLS_PKCS5_ENCRYPT, pwd, pwdlen,
|
|
c, len, pbe_buf, &pbe_out_len ) ) != 0 )
|
|
{
|
|
mbedtls_free( pbe_buf );
|
|
return( ret );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_PKCS5_C */
|
|
|
|
/* copy encrypted data to the target buffer */
|
|
c = buf + size - pbe_out_len;
|
|
memcpy( c, pbe_buf, pbe_out_len );
|
|
len = pbe_out_len;
|
|
mbedtls_free( pbe_buf );
|
|
pbe_buf = NULL;
|
|
|
|
/* encryptedData: mark as octet string */
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OCTET_STRING ) );
|
|
|
|
/* pbe algorithms */
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( &c, buf, pbe, pbelen ) );
|
|
|
|
/* top header */
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE ) );
|
|
}
|
|
|
|
return( (int) len );
|
|
}
|
|
#endif /* MBEDTLS_PK_WRITE_PKCS8_C */
|
|
|
|
#if defined(MBEDTLS_PEM_WRITE_C)
|
|
|
|
#define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
|
|
#define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
|
|
|
|
#define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
|
|
#define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
|
|
#define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
|
|
#define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
|
|
#define PEM_BEGIN_PRIVATE_KEY "-----BEGIN PRIVATE KEY-----\n"
|
|
#define PEM_END_PRIVATE_KEY "-----END PRIVATE KEY-----\n"
|
|
#define PEM_BEGIN_ENC_PRIVATE_KEY "-----BEGIN ENCRYPTED PRIVATE KEY-----\n"
|
|
#define PEM_END_ENC_PRIVATE_KEY "-----END ENCRYPTED PRIVATE KEY-----\n"
|
|
|
|
/*
|
|
* Max sizes of key per types. Shown as tag + len (+ content).
|
|
*/
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/*
|
|
* RSA public keys:
|
|
* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
|
|
* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
|
|
* + 1 + 1 + 9 (rsa oid)
|
|
* + 1 + 1 (params null)
|
|
* subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
|
|
* RSAPublicKey ::= SEQUENCE { 1 + 3
|
|
* modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
|
|
* publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
|
|
* }
|
|
*/
|
|
#define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
|
|
|
|
/*
|
|
* RSA private keys:
|
|
* RSAPrivateKey ::= SEQUENCE { 1 + 3
|
|
* version Version, 1 + 1 + 1
|
|
* modulus INTEGER, 1 + 3 + MPI_MAX + 1
|
|
* publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
|
|
* privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
|
|
* prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
|
|
* }
|
|
*/
|
|
#define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
|
|
MBEDTLS_MPI_MAX_SIZE % 2
|
|
#define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
|
|
+ 5 * MPI_MAX_SIZE_2
|
|
|
|
#else /* MBEDTLS_RSA_C */
|
|
|
|
#define RSA_PUB_DER_MAX_BYTES 0
|
|
#define RSA_PRV_DER_MAX_BYTES 0
|
|
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
/*
|
|
* EC public keys:
|
|
* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
|
|
* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
|
|
* + 1 + 1 + 7 (ec oid)
|
|
* + 1 + 1 + 9 (namedCurve oid)
|
|
* subjectPublicKey BIT STRING 1 + 2 + 1 [1]
|
|
* + 1 (point format) [1]
|
|
* + 2 * ECP_MAX (coords) [1]
|
|
* }
|
|
*/
|
|
#define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
|
|
|
|
/*
|
|
* EC private keys:
|
|
* ECPrivateKey ::= SEQUENCE { 1 + 2
|
|
* version INTEGER , 1 + 1 + 1
|
|
* privateKey OCTET STRING, 1 + 1 + ECP_MAX
|
|
* parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
|
|
* publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
|
|
* }
|
|
*/
|
|
#define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
|
|
|
|
#else /* MBEDTLS_ECP_C */
|
|
|
|
#define ECP_PUB_DER_MAX_BYTES 0
|
|
#define ECP_PRV_DER_MAX_BYTES 0
|
|
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
#if defined(MBEDTLS_PK_WRITE_PKCS8_C)
|
|
|
|
/*
|
|
* PKCS#8 v1.2 with RSA private key:
|
|
* PrivateKeyInfo ::= SEQUENCE { 1 + 2
|
|
* version Version, 1 + 1 + 1
|
|
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier, 1 + 1 (sequence)
|
|
* + 1 + 1 + 9 (rsa oid)
|
|
* + 1 + 1 (params null)
|
|
* privateKey PrivateKey, 0 (appended below)
|
|
* attributes [0] IMPLICIT Attributes OPTIONAL 0 (not supported)
|
|
* }
|
|
*/
|
|
#define PKCS8_RSA_PRV_DER_MAX_BYTES 21
|
|
|
|
/*
|
|
* PKCS#8 v1.2 with EC private key:
|
|
* PrivateKeyInfo ::= SEQUENCE { 1 + 2
|
|
* version Version, 1 + 1 + 1
|
|
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier, 1 + 1 (sequence)
|
|
* + 1 + 1 + 7 (ec oid)
|
|
* + 1 + 1 + 9 (namedCurve oid)
|
|
* privateKey PrivateKey, 0 (appended below)
|
|
* attributes [0] IMPLICIT Attributes OPTIONAL 0 (not supported)
|
|
* }
|
|
*/
|
|
#define PKCS8_EC_PRV_DER_MAX_BYTES 28
|
|
|
|
#define PKCS8_PRV_DER_MAX_BYTES \
|
|
PKCS8_RSA_PRV_DER_MAX_BYTES > PKCS8_EC_PRV_DER_MAX_BYTES ? \
|
|
PKCS8_RSA_PRV_DER_MAX_BYTES : PKCS8_EC_PRV_DER_MAX_BYTES
|
|
#else /* MBEDTLS_PK_WRITE_PKCS8_C */
|
|
#define PKCS8_PRV_DER_MAX_BYTES 0
|
|
#endif /* MBEDTLS_PK_WRITE_PKCS8_C */
|
|
|
|
#define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
|
|
RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
|
|
#define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
|
|
(RSA_PRV_DER_MAX_BYTES + (PKCS8_PRV_DER_MAX_BYTES)) : \
|
|
(ECP_PRV_DER_MAX_BYTES + (PKCS8_PRV_DER_MAX_BYTES))
|
|
|
|
int mbedtls_pk_write_pubkey_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
|
|
{
|
|
int ret;
|
|
unsigned char output_buf[PUB_DER_MAX_BYTES];
|
|
size_t olen = 0;
|
|
|
|
if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
|
|
sizeof(output_buf) ) ) < 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
|
|
output_buf + sizeof(output_buf) - ret,
|
|
ret, buf, size, &olen ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_pk_write_key_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size )
|
|
{
|
|
int ret;
|
|
unsigned char output_buf[PRV_DER_MAX_BYTES];
|
|
const char *begin, *end;
|
|
size_t olen = 0;
|
|
|
|
#if defined(MBEDTLS_FAST_EC_C)
|
|
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_X25519 || mbedtls_pk_get_type( key ) == MBEDTLS_PK_ED25519 )
|
|
return mbedtls_pk_write_key_pkcs8_pem(key, buf, size, NULL, 0, NULL, 0);
|
|
#endif
|
|
|
|
if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
|
|
return( ret );
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_RSA )
|
|
{
|
|
begin = PEM_BEGIN_PRIVATE_KEY_RSA;
|
|
end = PEM_END_PRIVATE_KEY_RSA;
|
|
}
|
|
else
|
|
#endif
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_ECKEY )
|
|
{
|
|
begin = PEM_BEGIN_PRIVATE_KEY_EC;
|
|
end = PEM_END_PRIVATE_KEY_EC;
|
|
}
|
|
else
|
|
#endif
|
|
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
|
|
|
|
if( ( ret = mbedtls_pem_write_buffer( begin, end,
|
|
output_buf + sizeof(output_buf) - ret,
|
|
ret, buf, size, &olen ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_PK_WRITE_PKCS8_C)
|
|
int mbedtls_pk_write_key_pkcs8_pem( mbedtls_pk_context *key, unsigned char *buf, size_t size,
|
|
const unsigned char *pwd, size_t pwdlen,
|
|
const unsigned char *pbe, size_t pbelen )
|
|
{
|
|
int ret;
|
|
unsigned char output_buf[PRV_DER_MAX_BYTES];
|
|
const char *begin, *end;
|
|
size_t olen = 0;
|
|
|
|
if( ( ret = mbedtls_pk_write_key_pkcs8_der( key, output_buf, sizeof(output_buf),
|
|
pwd, pwdlen, pbe, pbelen ) ) < 0 )
|
|
return( ret );
|
|
|
|
if (pwd != NULL && pwdlen > 0)
|
|
{
|
|
begin = PEM_BEGIN_ENC_PRIVATE_KEY;
|
|
end = PEM_END_ENC_PRIVATE_KEY;
|
|
}
|
|
else
|
|
{
|
|
begin = PEM_BEGIN_PRIVATE_KEY;
|
|
end = PEM_END_PRIVATE_KEY;
|
|
}
|
|
|
|
if( ( ret = mbedtls_pem_write_buffer( begin, end,
|
|
output_buf + sizeof(output_buf) - ret,
|
|
ret, buf, size, &olen ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PK_WRITE_PKCS8_C */
|
|
#endif /* MBEDTLS_PEM_WRITE_C */
|
|
|
|
#endif /* MBEDTLS_PK_WRITE_C */
|