350 lines
10 KiB
C
350 lines
10 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) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_PK_WRITE_C)
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#include "polarssl/pk.h"
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#include "polarssl/asn1write.h"
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#include "polarssl/oid.h"
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#if defined(POLARSSL_RSA_C)
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#include "polarssl/rsa.h"
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#endif
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#if defined(POLARSSL_ECP_C)
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#include "polarssl/ecp.h"
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#endif
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#if defined(POLARSSL_ECDSA_C)
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#include "polarssl/ecdsa.h"
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#endif
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#if defined(POLARSSL_PEM_WRITE_C)
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#include "polarssl/pem.h"
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#endif
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#if defined(POLARSSL_MEMORY_C)
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#include "polarssl/memory.h"
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#else
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#include <stdlib.h>
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#define polarssl_malloc malloc
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#define polarssl_free free
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#endif
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#if defined(POLARSSL_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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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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ASN1_CHK_ADD( len, asn1_write_mpi( p, start, &rsa->E ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( p, start, &rsa->N ) );
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ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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return( (int) len );
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}
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#endif /* POLARSSL_RSA_C */
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#if defined(POLARSSL_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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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[POLARSSL_ECP_MAX_PT_LEN];
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if( ( ret = ecp_point_write_binary( &ec->grp, &ec->Q,
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POLARSSL_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 < (int) len )
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return( POLARSSL_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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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 = oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
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return( ret );
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ASN1_CHK_ADD( len, asn1_write_oid( p, start, oid, oid_len ) );
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return( (int) len );
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}
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#endif /* POLARSSL_ECP_C */
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int pk_write_pubkey( unsigned char **p, unsigned char *start,
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const 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(POLARSSL_RSA_C)
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if( pk_get_type( key ) == POLARSSL_PK_RSA )
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ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, pk_rsa( *key ) ) );
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else
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#endif
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#if defined(POLARSSL_ECP_C)
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if( pk_get_type( key ) == POLARSSL_PK_ECKEY )
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ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, pk_ec( *key ) ) );
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else
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#endif
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return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
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return( (int) len );
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}
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int pk_write_pubkey_der( 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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ASN1_CHK_ADD( len, pk_write_pubkey( &c, buf, key ) );
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if( c - buf < 1 )
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return( POLARSSL_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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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );
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if( ( ret = oid_get_oid_by_pk_alg( 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(POLARSSL_ECP_C)
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if( pk_get_type( key ) == POLARSSL_PK_ECKEY )
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{
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ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, pk_ec( *key ) ) );
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}
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#endif
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ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
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par_len ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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return( (int) len );
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}
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int pk_write_key_der( 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(POLARSSL_RSA_C)
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if( pk_get_type( key ) == POLARSSL_PK_RSA )
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{
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rsa_context *rsa = pk_rsa( *key );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->QP ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DQ ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DP ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->Q ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->P ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->D ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
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ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 0 ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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}
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else
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#endif
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#if defined(POLARSSL_ECP_C)
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if( pk_get_type( key ) == POLARSSL_PK_ECKEY )
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{
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ecp_keypair *ec = 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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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( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
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*--c = 0;
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pub_len += 1;
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ASN1_CHK_ADD( pub_len, asn1_write_len( &c, buf, pub_len ) );
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ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );
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ASN1_CHK_ADD( pub_len, asn1_write_len( &c, buf, pub_len ) );
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ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, buf,
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ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 1 ) );
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len += pub_len;
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/* parameters */
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ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
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ASN1_CHK_ADD( par_len, asn1_write_len( &c, buf, par_len ) );
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ASN1_CHK_ADD( par_len, asn1_write_tag( &c, buf,
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ASN1_CONTEXT_SPECIFIC | 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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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &ec->d ) );
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*c = ASN1_OCTET_STRING;
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/* version */
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ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 1 ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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}
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else
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#endif
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return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
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return( (int) len );
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}
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#if defined(POLARSSL_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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int pk_write_pubkey_pem( 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[4096];
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size_t olen = 0;
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if( ( ret = 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 = 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 pk_write_key_pem( 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[4096];
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const char *begin, *end;
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size_t olen = 0;
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if( ( ret = pk_write_key_der( key, output_buf, sizeof(output_buf) ) ) < 0 )
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return( ret );
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#if defined(POLARSSL_RSA_C)
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if( pk_get_type( key ) == POLARSSL_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(POLARSSL_ECP_C)
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if( pk_get_type( key ) == POLARSSL_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( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
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if( ( ret = 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 /* POLARSSL_PEM_WRITE_C */
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#endif /* POLARSSL_PK_WRITE_C */
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