mbedtls/library/pk.c

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/*
* Public Key abstraction layer
*
* 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"
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#include "polarssl/pk.h"
#if defined(POLARSSL_RSA_C)
#include "polarssl/rsa.h"
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#endif
#if defined(POLARSSL_ECP_C)
#include "polarssl/ecp.h"
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#endif
#if defined(POLARSSL_ECDSA_C)
#include "polarssl/ecdsa.h"
#endif
#if defined(POLARSSL_MEMORY_C)
#include "polarssl/memory.h"
#else
#define polarssl_malloc malloc
#define polarssl_free free
#endif
#include <stdlib.h>
/*
* Initialise a pk_context
*/
void pk_init( pk_context *ctx )
{
if( ctx == NULL )
return;
ctx->type = POLARSSL_PK_NONE;
ctx->data = NULL;
ctx->dont_free = 0;
}
/*
* Free (the components of) a pk_context
*/
void pk_free( pk_context *ctx )
{
if( ctx == NULL )
return;
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#if defined(POLARSSL_RSA_C)
if( ctx->type == POLARSSL_PK_RSA )
rsa_free( ctx->data );
else
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#endif
#if defined(POLARSSL_ECP_C)
if( ctx->type == POLARSSL_PK_ECKEY || ctx->type == POLARSSL_PK_ECKEY_DH )
ecp_keypair_free( ctx->data );
else
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#endif
#if defined(POLARSSL_ECDSA_C)
if( ctx->type == POLARSSL_PK_ECDSA )
ecdsa_free( ctx->data );
else
#endif
{
; /* guard for the else's above */
}
if( ! ctx->dont_free )
polarssl_free( ctx->data );
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ctx->type = POLARSSL_PK_NONE;
ctx->data = NULL;
}
/*
* Set a pk_context to a given type
*/
int pk_set_type( pk_context *ctx, pk_type_t type )
{
size_t size;
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if( ctx->type == type )
return( 0 );
if( ctx->type != POLARSSL_PK_NONE )
return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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#if defined(POLARSSL_RSA_C)
if( type == POLARSSL_PK_RSA )
size = sizeof( rsa_context );
else
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#endif
#if defined(POLARSSL_ECP_C)
if( type == POLARSSL_PK_ECKEY || type == POLARSSL_PK_ECKEY_DH )
size = sizeof( ecp_keypair );
else
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#endif
#if defined(POLARSSL_ECDSA_C)
if( type == POLARSSL_PK_ECDSA )
size = sizeof( ecdsa_context );
else
#endif
return( POLARSSL_ERR_PK_TYPE_MISMATCH );
if( ( ctx->data = polarssl_malloc( size ) ) == NULL )
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return( POLARSSL_ERR_PK_MALLOC_FAILED );
memset( ctx->data, 0, size );
ctx->type = type;
return( 0 );
}
#if defined(POLARSSL_ECDSA_C)
/*
* Convert generic EC context to ECDSA
*/
int pk_ec_to_ecdsa( pk_context *ctx )
{
ecp_keypair *eckey;
ecdsa_context *ecdsa;
if( ctx->type == POLARSSL_PK_ECDSA )
return( 0 );
if( ctx->type != POLARSSL_PK_ECKEY )
return( POLARSSL_ERR_PK_TYPE_MISMATCH );
eckey = (ecp_keypair *) ctx->data;
if( ( ecdsa = polarssl_malloc( sizeof( ecdsa_context ) ) ) == NULL )
return( POLARSSL_ERR_PK_MALLOC_FAILED );
ecdsa_init( ecdsa );
/* struct ecdsa_context begins the same as struct ecp_keypair */
memcpy( ecdsa, eckey, sizeof( ecp_keypair ) );
if( ! ctx->dont_free )
polarssl_free( eckey );
ctx->dont_free = 0;
ctx->type = POLARSSL_PK_ECDSA;
ctx->data = ecdsa;
return( 0 );
}
#endif /* POLARSSL_ECDSA_C */
#if defined(POLARSSL_RSA_C)
/*
* Wrap an RSA context in a PK context
*/
int pk_wrap_rsa( pk_context *ctx, const rsa_context *rsa)
{
if( ctx->type != POLARSSL_PK_NONE )
return( POLARSSL_ERR_PK_TYPE_MISMATCH );
ctx->type = POLARSSL_PK_RSA;
ctx->data = (rsa_context *) rsa;
ctx->dont_free = 1;
return( 0 );
}
#endif