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/*
* Public Key abstraction layer: wrapper functions
*
* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://polarssl.org)
*
* 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"
#include <string.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 */