mbedtls/library/pkcs11.c
2014-06-17 14:06:49 +02:00

237 lines
6.1 KiB
C

/**
* \file pkcs11.c
*
* \brief Wrapper for PKCS#11 library libpkcs11-helper
*
* \author Adriaan de Jong <dejong@fox-it.com>
*
* Copyright (C) 2006-2014, 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/pkcs11.h"
#if defined(POLARSSL_PKCS11_C)
#include "polarssl/md.h"
#include "polarssl/oid.h"
#include "polarssl/x509_crt.h"
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#include <stdlib.h>
#define polarssl_malloc malloc
#define polarssl_free free
#endif
int pkcs11_x509_cert_init( x509_crt *cert, pkcs11h_certificate_t pkcs11_cert )
{
int ret = 1;
unsigned char *cert_blob = NULL;
size_t cert_blob_size = 0;
if( cert == NULL )
{
ret = 2;
goto cleanup;
}
if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, NULL,
&cert_blob_size ) != CKR_OK )
{
ret = 3;
goto cleanup;
}
cert_blob = polarssl_malloc( cert_blob_size );
if( NULL == cert_blob )
{
ret = 4;
goto cleanup;
}
if( pkcs11h_certificate_getCertificateBlob( pkcs11_cert, cert_blob,
&cert_blob_size ) != CKR_OK )
{
ret = 5;
goto cleanup;
}
if( 0 != x509_crt_parse(cert, cert_blob, cert_blob_size ) )
{
ret = 6;
goto cleanup;
}
ret = 0;
cleanup:
if( NULL != cert_blob )
polarssl_free( cert_blob );
return( ret );
}
int pkcs11_priv_key_init( pkcs11_context *priv_key,
pkcs11h_certificate_t pkcs11_cert )
{
int ret = 1;
x509_crt cert;
x509_crt_init( &cert );
if( priv_key == NULL )
goto cleanup;
if( 0 != pkcs11_x509_cert_init( &cert, pkcs11_cert ) )
goto cleanup;
priv_key->len = pk_get_len(&cert.pk);
priv_key->pkcs11h_cert = pkcs11_cert;
ret = 0;
cleanup:
x509_crt_free( &cert );
return( ret );
}
void pkcs11_priv_key_free( pkcs11_context *priv_key )
{
if( NULL != priv_key )
pkcs11h_certificate_freeCertificate( priv_key->pkcs11h_cert );
}
int pkcs11_decrypt( pkcs11_context *ctx,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len )
{
size_t input_len, output_len;
if( NULL == ctx )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
if( RSA_PRIVATE != mode )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
output_len = input_len = ctx->len;
if( input_len < 16 || input_len > output_max_len )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
/* Determine size of output buffer */
if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
input_len, NULL, &output_len ) != CKR_OK )
{
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
if( output_len > output_max_len )
return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
if( pkcs11h_certificate_decryptAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, input,
input_len, output, &output_len ) != CKR_OK )
{
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
*olen = output_len;
return( 0 );
}
int pkcs11_sign( pkcs11_context *ctx,
int mode,
md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig )
{
size_t sig_len = 0, asn_len = 0, oid_size = 0;
unsigned char *p = sig;
const char *oid;
if( NULL == ctx )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
if( RSA_PRIVATE != mode )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
if( md_alg != POLARSSL_MD_NONE )
{
const md_info_t *md_info = md_info_from_type( md_alg );
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
if( oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hashlen = md_get_size( md_info );
asn_len = 10 + oid_size;
}
sig_len = ctx->len;
if ( hashlen > sig_len || asn_len > sig_len ||
hashlen + asn_len > sig_len )
{
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
if( md_alg != POLARSSL_MD_NONE)
{
/*
* DigestInfo ::= SEQUENCE {
* digestAlgorithm DigestAlgorithmIdentifier,
* digest Digest }
*
* DigestAlgorithmIdentifier ::= AlgorithmIdentifier
*
* Digest ::= OCTET STRING
*/
*p++ = ASN1_SEQUENCE | ASN1_CONSTRUCTED;
*p++ = (unsigned char) ( 0x08 + oid_size + hashlen );
*p++ = ASN1_SEQUENCE | ASN1_CONSTRUCTED;
*p++ = (unsigned char) ( 0x04 + oid_size );
*p++ = ASN1_OID;
*p++ = oid_size & 0xFF;
memcpy( p, oid, oid_size );
p += oid_size;
*p++ = ASN1_NULL;
*p++ = 0x00;
*p++ = ASN1_OCTET_STRING;
*p++ = hashlen;
}
memcpy( p, hash, hashlen );
if( pkcs11h_certificate_signAny( ctx->pkcs11h_cert, CKM_RSA_PKCS, sig,
asn_len + hashlen, sig, &sig_len ) != CKR_OK )
{
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
return( 0 );
}
#endif /* defined(POLARSSL_PKCS11_C) */