163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/*
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* Public Key abstraction layer
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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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#include "polarssl/pk.h"
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#include "polarssl/pk_wrap.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_MEMORY_C)
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#include "polarssl/memory.h"
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#else
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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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#include <stdlib.h>
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/*
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* Initialise a pk_context
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*/
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void pk_init( pk_context *ctx )
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{
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if( ctx == NULL )
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return;
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ctx->info = NULL;
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ctx->type = POLARSSL_PK_NONE;
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ctx->data = NULL;
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}
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/*
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* Free (the components of) a pk_context
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*/
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void pk_free( pk_context *ctx )
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{
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if( ctx == NULL || ctx->info == NULL)
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return;
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ctx->info->ctx_free_func( ctx->data );
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ctx->data = NULL;
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ctx->info = NULL;
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ctx->type = POLARSSL_PK_NONE;
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}
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/*
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* Get pk_info structure from type
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*/
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static const pk_info_t * pk_info_from_type( pk_type_t pk_type )
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{
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switch( pk_type ) {
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#if defined(POLARSSL_RSA_C)
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case POLARSSL_PK_RSA:
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return &rsa_info;
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#endif
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#if defined(POLARSSL_ECP_C)
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case POLARSSL_PK_ECKEY:
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return &eckey_info;
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case POLARSSL_PK_ECKEY_DH:
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return &eckeydh_info;
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#endif
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#if defined(POLARSSL_ECDSA_C)
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case POLARSSL_PK_ECDSA:
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return &ecdsa_info;
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#endif
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default:
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return NULL;
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}
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}
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/*
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* Set a pk_context to a given type
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*/
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int pk_set_type( pk_context *ctx, pk_type_t type )
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{
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const pk_info_t *info;
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if( ctx->type == type )
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return( 0 );
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if( ctx->type != POLARSSL_PK_NONE )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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if( ( info = pk_info_from_type( type ) ) == NULL )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH );
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if( ( ctx->data = info->ctx_alloc_func() ) == NULL )
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return( POLARSSL_ERR_PK_MALLOC_FAILED );
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ctx->type = type;
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ctx->info = info;
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return( 0 );
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}
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/*
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* Tell if a PK can do the operations of the given type
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*/
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int pk_can_do( pk_context *ctx, pk_type_t type )
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{
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/* null of NONE context can't do anything */
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if( ctx == NULL || ctx->info == NULL )
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return( 0 );
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return( ctx->info->can_do( type ) );
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}
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/*
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* Verify a signature
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*/
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int pk_verify( pk_context *ctx,
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const unsigned char *hash, const md_info_t *md_info,
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const unsigned char *sig, size_t sig_len )
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{
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if( ctx == NULL || ctx->info == NULL )
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return( POLARSSL_ERR_PK_TYPE_MISMATCH ); // TODO
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return( ctx->info->verify_func( ctx->data, hash, md_info, sig, sig_len ) );
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}
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/*
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* Get key size in bits
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*/
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size_t pk_get_size( const pk_context *ctx )
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{
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if( ctx == NULL || ctx->info == NULL )
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return( 0 );
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return( ctx->info->get_size( ctx->data ) );
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}
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