505 lines
13 KiB
C
505 lines
13 KiB
C
/*
|
|
* Public Key abstraction layer: wrapper functions
|
|
*
|
|
* Copyright (C) 2006-2014, Brainspark B.V.
|
|
*
|
|
* This file is part of mbed TLS (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.
|
|
*/
|
|
|
|
#if !defined(POLARSSL_CONFIG_FILE)
|
|
#include "polarssl/config.h"
|
|
#else
|
|
#include POLARSSL_CONFIG_FILE
|
|
#endif
|
|
|
|
#if defined(POLARSSL_PK_C)
|
|
|
|
#include "polarssl/pk_wrap.h"
|
|
|
|
/* Even if RSA not activated, for the sake of RSA-alt */
|
|
#include "polarssl/rsa.h"
|
|
|
|
#if defined(POLARSSL_ECP_C)
|
|
#include "polarssl/ecp.h"
|
|
#endif
|
|
|
|
#if defined(POLARSSL_ECDSA_C)
|
|
#include "polarssl/ecdsa.h"
|
|
#endif
|
|
|
|
#if defined(POLARSSL_PLATFORM_C)
|
|
#include "polarssl/platform.h"
|
|
#else
|
|
#include <stdlib.h>
|
|
#define polarssl_malloc malloc
|
|
#define polarssl_free free
|
|
#endif
|
|
|
|
/* Implementation that should never be optimized out by the compiler */
|
|
static void polarssl_zeroize( void *v, size_t n ) {
|
|
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
|
|
}
|
|
|
|
#if defined(POLARSSL_RSA_C)
|
|
static int rsa_can_do( pk_type_t type )
|
|
{
|
|
return( type == POLARSSL_PK_RSA ||
|
|
type == POLARSSL_PK_RSASSA_PSS );
|
|
}
|
|
|
|
static size_t rsa_get_size( const void *ctx )
|
|
{
|
|
return( 8 * ((const rsa_context *) ctx)->len );
|
|
}
|
|
|
|
static int rsa_verify_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len )
|
|
{
|
|
int ret;
|
|
|
|
if( sig_len < ((rsa_context *) ctx)->len )
|
|
return( POLARSSL_ERR_RSA_VERIFY_FAILED );
|
|
|
|
if( ( ret = rsa_pkcs1_verify( (rsa_context *) ctx, NULL, NULL,
|
|
RSA_PUBLIC, md_alg,
|
|
(unsigned int) hash_len, hash, sig ) ) != 0 )
|
|
return( ret );
|
|
|
|
if( sig_len > ((rsa_context *) ctx)->len )
|
|
return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int rsa_sign_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
*sig_len = ((rsa_context *) ctx)->len;
|
|
|
|
return( rsa_pkcs1_sign( (rsa_context *) ctx, f_rng, p_rng, RSA_PRIVATE,
|
|
md_alg, (unsigned int) hash_len, hash, sig ) );
|
|
}
|
|
|
|
static int rsa_decrypt_wrap( void *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
if( ilen != ((rsa_context *) ctx)->len )
|
|
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
|
|
|
|
return( rsa_pkcs1_decrypt( (rsa_context *) ctx, f_rng, p_rng,
|
|
RSA_PRIVATE, olen, input, output, osize ) );
|
|
}
|
|
|
|
static int rsa_encrypt_wrap( void *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
*olen = ((rsa_context *) ctx)->len;
|
|
|
|
if( *olen > osize )
|
|
return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
|
|
|
|
return( rsa_pkcs1_encrypt( (rsa_context *) ctx,
|
|
f_rng, p_rng, RSA_PUBLIC, ilen, input, output ) );
|
|
}
|
|
|
|
static int rsa_check_pair_wrap( const void *pub, const void *prv )
|
|
{
|
|
return( rsa_check_pub_priv( (const rsa_context *) pub,
|
|
(const rsa_context *) prv ) );
|
|
}
|
|
|
|
static void *rsa_alloc_wrap( void )
|
|
{
|
|
void *ctx = polarssl_malloc( sizeof( rsa_context ) );
|
|
|
|
if( ctx != NULL )
|
|
rsa_init( (rsa_context *) ctx, 0, 0 );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void rsa_free_wrap( void *ctx )
|
|
{
|
|
rsa_free( (rsa_context *) ctx );
|
|
polarssl_free( ctx );
|
|
}
|
|
|
|
static void rsa_debug( const void *ctx, pk_debug_item *items )
|
|
{
|
|
items->type = POLARSSL_PK_DEBUG_MPI;
|
|
items->name = "rsa.N";
|
|
items->value = &( ((rsa_context *) ctx)->N );
|
|
|
|
items++;
|
|
|
|
items->type = POLARSSL_PK_DEBUG_MPI;
|
|
items->name = "rsa.E";
|
|
items->value = &( ((rsa_context *) ctx)->E );
|
|
}
|
|
|
|
const pk_info_t rsa_info = {
|
|
POLARSSL_PK_RSA,
|
|
"RSA",
|
|
rsa_get_size,
|
|
rsa_can_do,
|
|
rsa_verify_wrap,
|
|
rsa_sign_wrap,
|
|
rsa_decrypt_wrap,
|
|
rsa_encrypt_wrap,
|
|
rsa_check_pair_wrap,
|
|
rsa_alloc_wrap,
|
|
rsa_free_wrap,
|
|
rsa_debug,
|
|
};
|
|
#endif /* POLARSSL_RSA_C */
|
|
|
|
#if defined(POLARSSL_ECP_C)
|
|
/*
|
|
* Generic EC key
|
|
*/
|
|
static int eckey_can_do( pk_type_t type )
|
|
{
|
|
return( type == POLARSSL_PK_ECKEY ||
|
|
type == POLARSSL_PK_ECKEY_DH ||
|
|
type == POLARSSL_PK_ECDSA );
|
|
}
|
|
|
|
static size_t eckey_get_size( const void *ctx )
|
|
{
|
|
return( ((ecp_keypair *) ctx)->grp.pbits );
|
|
}
|
|
|
|
#if defined(POLARSSL_ECDSA_C)
|
|
/* Forward declarations */
|
|
static int ecdsa_verify_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len );
|
|
|
|
static int ecdsa_sign_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
|
|
|
|
static int eckey_verify_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len )
|
|
{
|
|
int ret;
|
|
ecdsa_context ecdsa;
|
|
|
|
ecdsa_init( &ecdsa );
|
|
|
|
if( ( ret = ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
|
|
ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
|
|
|
|
ecdsa_free( &ecdsa );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
static int eckey_sign_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
int ret;
|
|
ecdsa_context ecdsa;
|
|
|
|
ecdsa_init( &ecdsa );
|
|
|
|
if( ( ret = ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
|
|
ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
|
|
f_rng, p_rng );
|
|
|
|
ecdsa_free( &ecdsa );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* POLARSSL_ECDSA_C */
|
|
|
|
static int eckey_check_pair( const void *pub, const void *prv )
|
|
{
|
|
return( ecp_check_pub_priv( (const ecp_keypair *) pub,
|
|
(const ecp_keypair *) prv ) );
|
|
}
|
|
|
|
static void *eckey_alloc_wrap( void )
|
|
{
|
|
void *ctx = polarssl_malloc( sizeof( ecp_keypair ) );
|
|
|
|
if( ctx != NULL )
|
|
ecp_keypair_init( ctx );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void eckey_free_wrap( void *ctx )
|
|
{
|
|
ecp_keypair_free( (ecp_keypair *) ctx );
|
|
polarssl_free( ctx );
|
|
}
|
|
|
|
static void eckey_debug( const void *ctx, pk_debug_item *items )
|
|
{
|
|
items->type = POLARSSL_PK_DEBUG_ECP;
|
|
items->name = "eckey.Q";
|
|
items->value = &( ((ecp_keypair *) ctx)->Q );
|
|
}
|
|
|
|
const pk_info_t eckey_info = {
|
|
POLARSSL_PK_ECKEY,
|
|
"EC",
|
|
eckey_get_size,
|
|
eckey_can_do,
|
|
#if defined(POLARSSL_ECDSA_C)
|
|
eckey_verify_wrap,
|
|
eckey_sign_wrap,
|
|
#else
|
|
NULL,
|
|
NULL,
|
|
#endif
|
|
NULL,
|
|
NULL,
|
|
eckey_check_pair,
|
|
eckey_alloc_wrap,
|
|
eckey_free_wrap,
|
|
eckey_debug,
|
|
};
|
|
|
|
/*
|
|
* EC key restricted to ECDH
|
|
*/
|
|
static int eckeydh_can_do( pk_type_t type )
|
|
{
|
|
return( type == POLARSSL_PK_ECKEY ||
|
|
type == POLARSSL_PK_ECKEY_DH );
|
|
}
|
|
|
|
const pk_info_t eckeydh_info = {
|
|
POLARSSL_PK_ECKEY_DH,
|
|
"EC_DH",
|
|
eckey_get_size, /* Same underlying key structure */
|
|
eckeydh_can_do,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
eckey_check_pair,
|
|
eckey_alloc_wrap, /* Same underlying key structure */
|
|
eckey_free_wrap, /* Same underlying key structure */
|
|
eckey_debug, /* Same underlying key structure */
|
|
};
|
|
#endif /* POLARSSL_ECP_C */
|
|
|
|
#if defined(POLARSSL_ECDSA_C)
|
|
static int ecdsa_can_do( pk_type_t type )
|
|
{
|
|
return( type == POLARSSL_PK_ECDSA );
|
|
}
|
|
|
|
static int ecdsa_verify_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len )
|
|
{
|
|
int ret;
|
|
((void) md_alg);
|
|
|
|
ret = ecdsa_read_signature( (ecdsa_context *) ctx,
|
|
hash, hash_len, sig, sig_len );
|
|
|
|
if( ret == POLARSSL_ERR_ECP_SIG_LEN_MISMATCH )
|
|
return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
static int ecdsa_sign_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
/* Use deterministic ECDSA by default if available */
|
|
#if defined(POLARSSL_ECDSA_DETERMINISTIC)
|
|
((void) f_rng);
|
|
((void) p_rng);
|
|
|
|
return( ecdsa_write_signature_det( (ecdsa_context *) ctx,
|
|
hash, hash_len, sig, sig_len, md_alg ) );
|
|
#else
|
|
((void) md_alg);
|
|
|
|
return( ecdsa_write_signature( (ecdsa_context *) ctx,
|
|
hash, hash_len, sig, sig_len, f_rng, p_rng ) );
|
|
#endif /* POLARSSL_ECDSA_DETERMINISTIC */
|
|
}
|
|
|
|
static void *ecdsa_alloc_wrap( void )
|
|
{
|
|
void *ctx = polarssl_malloc( sizeof( ecdsa_context ) );
|
|
|
|
if( ctx != NULL )
|
|
ecdsa_init( (ecdsa_context *) ctx );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void ecdsa_free_wrap( void *ctx )
|
|
{
|
|
ecdsa_free( (ecdsa_context *) ctx );
|
|
polarssl_free( ctx );
|
|
}
|
|
|
|
const pk_info_t ecdsa_info = {
|
|
POLARSSL_PK_ECDSA,
|
|
"ECDSA",
|
|
eckey_get_size, /* Compatible key structures */
|
|
ecdsa_can_do,
|
|
ecdsa_verify_wrap,
|
|
ecdsa_sign_wrap,
|
|
NULL,
|
|
NULL,
|
|
eckey_check_pair, /* Compatible key structures */
|
|
ecdsa_alloc_wrap,
|
|
ecdsa_free_wrap,
|
|
eckey_debug, /* Compatible key structures */
|
|
};
|
|
#endif /* POLARSSL_ECDSA_C */
|
|
|
|
/*
|
|
* Support for alternative RSA-private implementations
|
|
*/
|
|
|
|
static int rsa_alt_can_do( pk_type_t type )
|
|
{
|
|
return( type == POLARSSL_PK_RSA );
|
|
}
|
|
|
|
static size_t rsa_alt_get_size( const void *ctx )
|
|
{
|
|
const rsa_alt_context *rsa_alt = (const rsa_alt_context *) ctx;
|
|
|
|
return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
|
|
}
|
|
|
|
static int rsa_alt_sign_wrap( void *ctx, md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
rsa_alt_context *rsa_alt = (rsa_alt_context *) ctx;
|
|
|
|
*sig_len = rsa_alt->key_len_func( rsa_alt->key );
|
|
|
|
return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, RSA_PRIVATE,
|
|
md_alg, (unsigned int) hash_len, hash, sig ) );
|
|
}
|
|
|
|
static int rsa_alt_decrypt_wrap( void *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
|
|
{
|
|
rsa_alt_context *rsa_alt = (rsa_alt_context *) ctx;
|
|
|
|
((void) f_rng);
|
|
((void) p_rng);
|
|
|
|
if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
|
|
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
|
|
|
|
return( rsa_alt->decrypt_func( rsa_alt->key,
|
|
RSA_PRIVATE, olen, input, output, osize ) );
|
|
}
|
|
|
|
#if defined(POLARSSL_RSA_C)
|
|
static int rsa_alt_check_pair( const void *pub, const void *prv )
|
|
{
|
|
unsigned char sig[POLARSSL_MPI_MAX_SIZE];
|
|
unsigned char hash[32];
|
|
size_t sig_len = 0;
|
|
int ret;
|
|
|
|
if( rsa_alt_get_size( prv ) != rsa_get_size( pub ) )
|
|
return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
|
|
|
|
memset( hash, 0x2a, sizeof( hash ) );
|
|
|
|
if( ( ret = rsa_alt_sign_wrap( (void *) prv, POLARSSL_MD_NONE,
|
|
hash, sizeof( hash ),
|
|
sig, &sig_len, NULL, NULL ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
if( rsa_verify_wrap( (void *) pub, POLARSSL_MD_NONE,
|
|
hash, sizeof( hash ), sig, sig_len ) != 0 )
|
|
{
|
|
return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* POLARSSL_RSA_C */
|
|
|
|
static void *rsa_alt_alloc_wrap( void )
|
|
{
|
|
void *ctx = polarssl_malloc( sizeof( rsa_alt_context ) );
|
|
|
|
if( ctx != NULL )
|
|
memset( ctx, 0, sizeof( rsa_alt_context ) );
|
|
|
|
return( ctx );
|
|
}
|
|
|
|
static void rsa_alt_free_wrap( void *ctx )
|
|
{
|
|
polarssl_zeroize( ctx, sizeof( rsa_alt_context ) );
|
|
polarssl_free( ctx );
|
|
}
|
|
|
|
const pk_info_t rsa_alt_info = {
|
|
POLARSSL_PK_RSA_ALT,
|
|
"RSA-alt",
|
|
rsa_alt_get_size,
|
|
rsa_alt_can_do,
|
|
NULL,
|
|
rsa_alt_sign_wrap,
|
|
rsa_alt_decrypt_wrap,
|
|
NULL,
|
|
#if defined(POLARSSL_RSA_C)
|
|
rsa_alt_check_pair,
|
|
#else
|
|
NULL,
|
|
#endif
|
|
rsa_alt_alloc_wrap,
|
|
rsa_alt_free_wrap,
|
|
NULL,
|
|
};
|
|
|
|
#endif /* POLARSSL_PK_C */
|