Moved PK key writing from X509 module to PK module
This commit is contained in:
Paul Bakker
parent
1a7550ac67
commit
c7bb02be77
13 changed files with 575 additions and 445 deletions
389
library/pkwrite.c
Normal file
389
library/pkwrite.c
Normal file
|
|
@ -0,0 +1,389 @@
|
|||
/*
|
||||
* Public Key layer for writing key files and structures
|
||||
*
|
||||
* Copyright (C) 2006-2013, Brainspark B.V.
|
||||
*
|
||||
* This file is part of PolarSSL (http://www.polarssl.org)
|
||||
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
|
||||
*
|
||||
* All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*/
|
||||
|
||||
#include "polarssl/config.h"
|
||||
|
||||
#if defined(POLARSSL_PK_C)
|
||||
|
||||
#include "polarssl/pk.h"
|
||||
#include "polarssl/asn1write.h"
|
||||
#include "polarssl/oid.h"
|
||||
|
||||
#if defined(POLARSSL_RSA_C)
|
||||
#include "polarssl/rsa.h"
|
||||
#endif
|
||||
#if defined(POLARSSL_ECP_C)
|
||||
#include "polarssl/ecp.h"
|
||||
#endif
|
||||
#if defined(POLARSSL_ECDSA_C)
|
||||
#include "polarssl/ecdsa.h"
|
||||
#endif
|
||||
#if defined(POLARSSL_BASE64_C)
|
||||
#include "polarssl/base64.h"
|
||||
#endif
|
||||
|
||||
#if defined(POLARSSL_MEMORY_C)
|
||||
#include "polarssl/memory.h"
|
||||
#else
|
||||
#include <stdlib.h>
|
||||
#define polarssl_malloc malloc
|
||||
#define polarssl_free free
|
||||
#endif
|
||||
|
||||
#if defined(POLARSSL_RSA_C)
|
||||
/*
|
||||
* RSAPublicKey ::= SEQUENCE {
|
||||
* modulus INTEGER, -- n
|
||||
* publicExponent INTEGER -- e
|
||||
* }
|
||||
*/
|
||||
static int pk_write_rsa_pubkey( unsigned char **p, unsigned char *start,
|
||||
rsa_context *rsa )
|
||||
{
|
||||
int ret;
|
||||
size_t len = 0;
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( p, start, &rsa->E ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( p, start, &rsa->N ) );
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
||||
|
||||
return( len );
|
||||
}
|
||||
#endif /* POLARSSL_RSA_C */
|
||||
|
||||
#if defined(POLARSSL_ECP_C)
|
||||
/*
|
||||
* EC public key is an EC point
|
||||
*/
|
||||
static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
|
||||
ecp_keypair *ec )
|
||||
{
|
||||
int ret;
|
||||
size_t len = 0;
|
||||
unsigned char buf[POLARSSL_ECP_MAX_PT_LEN];
|
||||
|
||||
if( ( ret = ecp_point_write_binary( &ec->grp, &ec->Q,
|
||||
POLARSSL_ECP_PF_UNCOMPRESSED,
|
||||
&len, buf, sizeof( buf ) ) ) != 0 )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
|
||||
if( *p - start < (int) len )
|
||||
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
|
||||
|
||||
*p -= len;
|
||||
memcpy( *p, buf, len );
|
||||
|
||||
return( len );
|
||||
}
|
||||
|
||||
/*
|
||||
* ECParameters ::= CHOICE {
|
||||
* namedCurve OBJECT IDENTIFIER
|
||||
* }
|
||||
*/
|
||||
static int pk_write_ec_param( unsigned char **p, unsigned char *start,
|
||||
ecp_keypair *ec )
|
||||
{
|
||||
int ret;
|
||||
size_t len = 0;
|
||||
const char *oid;
|
||||
size_t oid_len;
|
||||
|
||||
if( ( ret = oid_get_oid_by_ec_grp( ec->grp.id, &oid, &oid_len ) ) != 0 )
|
||||
return( ret );
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_oid( p, start, oid, oid_len ) );
|
||||
|
||||
return( len );
|
||||
}
|
||||
#endif /* POLARSSL_ECP_C */
|
||||
|
||||
int pk_write_pubkey( unsigned char **p, unsigned char *start,
|
||||
const pk_context *key )
|
||||
{
|
||||
int ret;
|
||||
size_t len = 0;
|
||||
|
||||
#if defined(POLARSSL_RSA_C)
|
||||
if( pk_get_type( key ) == POLARSSL_PK_RSA )
|
||||
ASN1_CHK_ADD( len, pk_write_rsa_pubkey( p, start, pk_rsa( *key ) ) );
|
||||
else
|
||||
#endif
|
||||
#if defined(POLARSSL_ECP_C)
|
||||
if( pk_get_type( key ) == POLARSSL_PK_ECKEY )
|
||||
ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, pk_ec( *key ) ) );
|
||||
else
|
||||
#endif
|
||||
return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
|
||||
|
||||
return( len );
|
||||
}
|
||||
|
||||
int pk_write_pubkey_der( pk_context *key, unsigned char *buf, size_t size )
|
||||
{
|
||||
int ret;
|
||||
unsigned char *c;
|
||||
size_t len = 0, par_len = 0, oid_len;
|
||||
const char *oid;
|
||||
|
||||
c = buf + size;
|
||||
|
||||
ASN1_CHK_ADD( len, pk_write_pubkey( &c, buf, key ) );
|
||||
|
||||
if( c - buf < 1 )
|
||||
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
|
||||
|
||||
/*
|
||||
* SubjectPublicKeyInfo ::= SEQUENCE {
|
||||
* algorithm AlgorithmIdentifier,
|
||||
* subjectPublicKey BIT STRING }
|
||||
*/
|
||||
*--c = 0;
|
||||
len += 1;
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );
|
||||
|
||||
if( ( ret = oid_get_oid_by_pk_alg( pk_get_type( key ),
|
||||
&oid, &oid_len ) ) != 0 )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
|
||||
#if defined(POLARSSL_ECP_C)
|
||||
if( pk_get_type( key ) == POLARSSL_PK_ECKEY )
|
||||
{
|
||||
ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, pk_ec( *key ) ) );
|
||||
}
|
||||
#endif
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, buf, oid, oid_len,
|
||||
par_len ) );
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
||||
|
||||
return( len );
|
||||
}
|
||||
|
||||
int pk_write_key_der( pk_context *key, unsigned char *buf, size_t size )
|
||||
{
|
||||
int ret;
|
||||
unsigned char *c = buf + size;
|
||||
size_t len = 0;
|
||||
|
||||
#if defined(POLARSSL_RSA_C)
|
||||
if( pk_get_type( key ) == POLARSSL_PK_RSA )
|
||||
{
|
||||
rsa_context *rsa = pk_rsa( *key );
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->QP ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DQ ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DP ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->Q ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->P ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->D ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 0 ) );
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
||||
}
|
||||
else
|
||||
#endif
|
||||
#if defined(POLARSSL_ECP_C)
|
||||
if( pk_get_type( key ) == POLARSSL_PK_ECKEY )
|
||||
{
|
||||
ecp_keypair *ec = pk_ec( *key );
|
||||
size_t pub_len = 0, par_len = 0;
|
||||
|
||||
/*
|
||||
* RFC 5915, or SEC1 Appendix C.4
|
||||
*
|
||||
* ECPrivateKey ::= SEQUENCE {
|
||||
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
|
||||
* privateKey OCTET STRING,
|
||||
* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
|
||||
* publicKey [1] BIT STRING OPTIONAL
|
||||
* }
|
||||
*/
|
||||
|
||||
/* publicKey */
|
||||
ASN1_CHK_ADD( pub_len, pk_write_ec_pubkey( &c, buf, ec ) );
|
||||
|
||||
if( c - buf < 1 )
|
||||
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
|
||||
*--c = 0;
|
||||
pub_len += 1;
|
||||
|
||||
ASN1_CHK_ADD( pub_len, asn1_write_len( &c, buf, pub_len ) );
|
||||
ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );
|
||||
|
||||
ASN1_CHK_ADD( pub_len, asn1_write_len( &c, buf, pub_len ) );
|
||||
ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, buf,
|
||||
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 1 ) );
|
||||
len += pub_len;
|
||||
|
||||
/* parameters */
|
||||
ASN1_CHK_ADD( par_len, pk_write_ec_param( &c, buf, ec ) );
|
||||
|
||||
ASN1_CHK_ADD( par_len, asn1_write_len( &c, buf, par_len ) );
|
||||
ASN1_CHK_ADD( par_len, asn1_write_tag( &c, buf,
|
||||
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) );
|
||||
len += par_len;
|
||||
|
||||
/* privateKey: write as MPI then fix tag */
|
||||
ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &ec->d ) );
|
||||
*c = ASN1_OCTET_STRING;
|
||||
|
||||
/* version */
|
||||
ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 1 ) );
|
||||
|
||||
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
|
||||
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
||||
}
|
||||
else
|
||||
#endif
|
||||
return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
|
||||
|
||||
return( len );
|
||||
}
|
||||
|
||||
#if defined(POLARSSL_BASE64_C)
|
||||
static int pk_write_pemify( const char *begin_str, const char *end_str,
|
||||
const unsigned char *der_data, size_t der_len,
|
||||
unsigned char *buf, size_t size )
|
||||
{
|
||||
int ret;
|
||||
unsigned char base_buf[4096];
|
||||
unsigned char *c = base_buf, *p = buf;
|
||||
size_t len = 0, olen = sizeof(base_buf);
|
||||
|
||||
if( ( ret = base64_encode( base_buf, &olen, der_data, der_len ) ) != 0 )
|
||||
return( ret );
|
||||
|
||||
if( olen + strlen( begin_str ) + strlen( end_str ) +
|
||||
olen / 64 > size )
|
||||
{
|
||||
return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL );
|
||||
}
|
||||
|
||||
memcpy( p, begin_str, strlen( begin_str ) );
|
||||
p += strlen( begin_str );
|
||||
|
||||
while( olen )
|
||||
{
|
||||
len = ( olen > 64 ) ? 64 : olen;
|
||||
memcpy( p, c, len );
|
||||
olen -= len;
|
||||
p += len;
|
||||
c += len;
|
||||
*p++ = '\n';
|
||||
}
|
||||
|
||||
memcpy( p, end_str, strlen( end_str ) );
|
||||
p += strlen( end_str );
|
||||
|
||||
*p = '\0';
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
#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"
|
||||
|
||||
int pk_write_pubkey_pem( pk_context *key, unsigned char *buf, size_t size )
|
||||
{
|
||||
int ret;
|
||||
unsigned char output_buf[4096];
|
||||
|
||||
if( ( ret = pk_write_pubkey_der( key, output_buf,
|
||||
sizeof(output_buf) ) ) < 0 )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
|
||||
if( ( ret = pk_write_pemify( PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
|
||||
output_buf + sizeof(output_buf) - ret,
|
||||
ret, buf, size ) ) != 0 )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
int pk_write_key_pem( pk_context *key, unsigned char *buf, size_t size )
|
||||
{
|
||||
int ret;
|
||||
unsigned char output_buf[4096];
|
||||
char *begin, *end;
|
||||
|
||||
if( ( ret = pk_write_key_der( key, output_buf,
|
||||
sizeof(output_buf) ) ) < 0 )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
|
||||
#if defined(POLARSSL_RSA_C)
|
||||
if( pk_get_type( key ) == POLARSSL_PK_RSA )
|
||||
{
|
||||
begin = PEM_BEGIN_PRIVATE_KEY_RSA;
|
||||
end = PEM_END_PRIVATE_KEY_RSA;
|
||||
}
|
||||
else
|
||||
#endif
|
||||
#if defined(POLARSSL_ECP_C)
|
||||
if( pk_get_type( key ) == POLARSSL_PK_ECKEY )
|
||||
{
|
||||
begin = PEM_BEGIN_PRIVATE_KEY_EC;
|
||||
end = PEM_END_PRIVATE_KEY_EC;
|
||||
}
|
||||
else
|
||||
#endif
|
||||
return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
|
||||
|
||||
if( ( ret = pk_write_pemify( begin, end,
|
||||
output_buf + sizeof(output_buf) - ret,
|
||||
ret, buf, size ) ) != 0 )
|
||||
{
|
||||
return( ret );
|
||||
}
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
#endif /* POLARSSL_BASE64_C */
|
||||
|
||||
#endif /* POLARSSL_PK_C */
|
||||
Loading…
Add table
Add a link
Reference in a new issue