546 lines
17 KiB
C
546 lines
17 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 "mbedtls/platform_util.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_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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/* Parameter validation macros based on platform_util.h */
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#define PK_VALIDATE_RET( cond ) \
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MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA )
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#define PK_VALIDATE( cond ) \
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MBEDTLS_INTERNAL_VALIDATE( cond )
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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_mpi T;
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mbedtls_mpi_init( &T );
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/* Export E */
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if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &T ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export N */
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if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL, NULL, NULL, NULL ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( p, start, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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end_of_export:
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mbedtls_mpi_free( &T );
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if( ret < 0 )
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return( ret );
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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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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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PK_VALIDATE_RET( p != NULL );
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PK_VALIDATE_RET( *p != NULL );
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PK_VALIDATE_RET( start != NULL );
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PK_VALIDATE_RET( key != NULL );
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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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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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PK_VALIDATE_RET( key != NULL );
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if( size == 0 )
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return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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PK_VALIDATE_RET( buf != NULL );
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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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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;
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size_t len = 0;
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PK_VALIDATE_RET( key != NULL );
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if( size == 0 )
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return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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PK_VALIDATE_RET( buf != NULL );
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c = buf + size;
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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_mpi T; /* Temporary holding the exported parameters */
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mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *key );
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/*
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* Export the parameters one after another to avoid simultaneous copies.
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*/
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mbedtls_mpi_init( &T );
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/* Export QP */
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if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, NULL, &T ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export DQ */
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if( ( ret = mbedtls_rsa_export_crt( rsa, NULL, &T, NULL ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export DP */
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if( ( ret = mbedtls_rsa_export_crt( rsa, &T, NULL, NULL ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export Q */
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if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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&T, NULL, NULL ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export P */
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if ( ( ret = mbedtls_rsa_export( rsa, NULL, &T,
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NULL, NULL, NULL ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export D */
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if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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NULL, &T, NULL ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export E */
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if ( ( ret = mbedtls_rsa_export( rsa, NULL, NULL,
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NULL, NULL, &T ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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/* Export N */
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if ( ( ret = mbedtls_rsa_export( rsa, &T, NULL,
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NULL, NULL, NULL ) ) != 0 ||
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( ret = mbedtls_asn1_write_mpi( &c, buf, &T ) ) < 0 )
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goto end_of_export;
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len += ret;
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end_of_export:
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mbedtls_mpi_free( &T );
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if( ret < 0 )
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return( ret );
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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,
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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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return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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return( (int) len );
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}
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#if defined(MBEDTLS_PEM_WRITE_C)
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#define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
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#define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
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#define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
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#define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
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#define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
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#define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
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/*
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* Max sizes of key per types. Shown as tag + len (+ content).
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*/
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#if defined(MBEDTLS_RSA_C)
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/*
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* RSA public keys:
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* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
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* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
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* + 1 + 1 + 9 (rsa oid)
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* + 1 + 1 (params null)
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* subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
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* RSAPublicKey ::= SEQUENCE { 1 + 3
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* modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
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* publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
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* }
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*/
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#define RSA_PUB_DER_MAX_BYTES 38 + 2 * MBEDTLS_MPI_MAX_SIZE
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/*
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* RSA private keys:
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* RSAPrivateKey ::= SEQUENCE { 1 + 3
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* version Version, 1 + 1 + 1
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* modulus INTEGER, 1 + 3 + MPI_MAX + 1
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* publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
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* privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
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* prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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* prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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* exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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* exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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* coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
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* otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
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* }
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*/
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#define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \
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MBEDTLS_MPI_MAX_SIZE % 2
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#define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
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+ 5 * MPI_MAX_SIZE_2
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#else /* MBEDTLS_RSA_C */
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#define RSA_PUB_DER_MAX_BYTES 0
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#define RSA_PRV_DER_MAX_BYTES 0
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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 keys:
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* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
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* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
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* + 1 + 1 + 7 (ec oid)
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* + 1 + 1 + 9 (namedCurve oid)
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* subjectPublicKey BIT STRING 1 + 2 + 1 [1]
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* + 1 (point format) [1]
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* + 2 * ECP_MAX (coords) [1]
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* }
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*/
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#define ECP_PUB_DER_MAX_BYTES 30 + 2 * MBEDTLS_ECP_MAX_BYTES
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/*
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* EC private keys:
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* ECPrivateKey ::= SEQUENCE { 1 + 2
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* version INTEGER , 1 + 1 + 1
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* privateKey OCTET STRING, 1 + 1 + ECP_MAX
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* parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
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* publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
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* }
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*/
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#define ECP_PRV_DER_MAX_BYTES 29 + 3 * MBEDTLS_ECP_MAX_BYTES
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#else /* MBEDTLS_ECP_C */
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#define ECP_PUB_DER_MAX_BYTES 0
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#define ECP_PRV_DER_MAX_BYTES 0
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#endif /* MBEDTLS_ECP_C */
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#define PUB_DER_MAX_BYTES RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
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RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES
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#define PRV_DER_MAX_BYTES RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
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RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES
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int mbedtls_pk_write_pubkey_pem( 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 output_buf[PUB_DER_MAX_BYTES];
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size_t olen = 0;
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PK_VALIDATE_RET( key != NULL );
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PK_VALIDATE_RET( buf != NULL || size == 0 );
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if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf,
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sizeof(output_buf) ) ) < 0 )
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{
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return( ret );
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}
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if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
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output_buf + sizeof(output_buf) - ret,
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ret, buf, size, &olen ) ) != 0 )
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{
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return( ret );
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}
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return( 0 );
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}
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int mbedtls_pk_write_key_pem( 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 output_buf[PRV_DER_MAX_BYTES];
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const char *begin, *end;
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size_t olen = 0;
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PK_VALIDATE_RET( key != NULL );
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PK_VALIDATE_RET( buf != NULL || size == 0 );
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if( ( ret = mbedtls_pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
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return( ret );
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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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begin = PEM_BEGIN_PRIVATE_KEY_RSA;
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end = PEM_END_PRIVATE_KEY_RSA;
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}
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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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{
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begin = PEM_BEGIN_PRIVATE_KEY_EC;
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end = PEM_END_PRIVATE_KEY_EC;
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}
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else
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#endif
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return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
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if( ( ret = mbedtls_pem_write_buffer( begin, end,
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output_buf + sizeof(output_buf) - ret,
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ret, buf, size, &olen ) ) != 0 )
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{
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return( ret );
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}
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return( 0 );
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}
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#endif /* MBEDTLS_PEM_WRITE_C */
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#endif /* MBEDTLS_PK_WRITE_C */
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