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mbedtls/library/pk_wrap.c
Manuel Pégourié-Gonnard 31f0ef7b19 Fix style issues introduced earlier
2017-08-09 11:44:53 +02:00

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/*
* Public Key abstraction layer: wrapper functions
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PK_C)
#include "mbedtls/pk_internal.h"
/* Even if RSA not activated, for the sake of RSA-alt */
#include "mbedtls/rsa.h"
#include "mbedtls/bignum.h"
#include <string.h>
#if defined(MBEDTLS_ECP_C)
#include "mbedtls/ecp.h"
#endif
#if defined(MBEDTLS_ECDSA_C)
#include "mbedtls/ecdsa.h"
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
#include <limits.h>
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
#endif
#if defined(MBEDTLS_RSA_C)
static int rsa_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_RSA ||
type == MBEDTLS_PK_RSASSA_PSS );
}
static size_t rsa_get_bitlen( const void *ctx )
{
return( 8 * ((const mbedtls_rsa_context *) ctx)->len );
}
static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
int ret;
#if defined(MBEDTLS_HAVE_INT64)
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */
if( sig_len < ((mbedtls_rsa_context *) ctx)->len )
return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
if( ( ret = mbedtls_rsa_pkcs1_verify( (mbedtls_rsa_context *) ctx, NULL, NULL,
MBEDTLS_RSA_PUBLIC, md_alg,
(unsigned int) hash_len, hash, sig ) ) != 0 )
return( ret );
if( sig_len > ((mbedtls_rsa_context *) ctx)->len )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
return( 0 );
}
static int rsa_sign_wrap( void *ctx, mbedtls_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 )
{
#if defined(MBEDTLS_HAVE_INT64)
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */
*sig_len = ((mbedtls_rsa_context *) ctx)->len;
return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, f_rng, p_rng, MBEDTLS_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 != ((mbedtls_rsa_context *) ctx)->len )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
return( mbedtls_rsa_pkcs1_decrypt( (mbedtls_rsa_context *) ctx, f_rng, p_rng,
MBEDTLS_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 = ((mbedtls_rsa_context *) ctx)->len;
if( *olen > osize )
return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
return( mbedtls_rsa_pkcs1_encrypt( (mbedtls_rsa_context *) ctx,
f_rng, p_rng, MBEDTLS_RSA_PUBLIC, ilen, input, output ) );
}
static int rsa_check_pair_wrap( const void *pub, const void *prv )
{
return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
(const mbedtls_rsa_context *) prv ) );
}
static void *rsa_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );
if( ctx != NULL )
mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );
return( ctx );
}
static void rsa_free_wrap( void *ctx )
{
mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
mbedtls_free( ctx );
}
static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )
{
items->type = MBEDTLS_PK_DEBUG_MPI;
items->name = "rsa.N";
items->value = &( ((mbedtls_rsa_context *) ctx)->N );
items++;
items->type = MBEDTLS_PK_DEBUG_MPI;
items->name = "rsa.E";
items->value = &( ((mbedtls_rsa_context *) ctx)->E );
}
const mbedtls_pk_info_t mbedtls_rsa_info = {
MBEDTLS_PK_RSA,
"RSA",
rsa_get_bitlen,
rsa_can_do,
rsa_verify_wrap,
rsa_sign_wrap,
#if defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
rsa_decrypt_wrap,
rsa_encrypt_wrap,
rsa_check_pair_wrap,
rsa_alloc_wrap,
rsa_free_wrap,
rsa_debug,
};
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_C)
/*
* Generic EC key
*/
static int eckey_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_ECKEY ||
type == MBEDTLS_PK_ECKEY_DH ||
type == MBEDTLS_PK_ECDSA );
}
static size_t eckey_get_bitlen( const void *ctx )
{
return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
}
#if defined(MBEDTLS_ECDSA_C)
/* Forward declarations */
static int ecdsa_verify_wrap( void *ctx, mbedtls_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, mbedtls_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, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
int ret;
mbedtls_ecdsa_context ecdsa;
mbedtls_ecdsa_init( &ecdsa );
if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
mbedtls_ecdsa_free( &ecdsa );
return( ret );
}
static int eckey_sign_wrap( void *ctx, mbedtls_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;
mbedtls_ecdsa_context ecdsa;
mbedtls_ecdsa_init( &ecdsa );
if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
f_rng, p_rng );
mbedtls_ecdsa_free( &ecdsa );
return( ret );
}
#if defined(MBEDTLS_ECP_RESTARTABLE)
/* Forward declarations */
static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx );
static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_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,
void *rs_ctx );
static int eckey_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *p_rs_ctx )
{
int ret;
mbedtls_ecdsa_context ecdsa, *p_ecdsa = &ecdsa;
mbedtls_ecdsa_restart_ctx *rs_ctx = p_rs_ctx;
mbedtls_ecdsa_init( &ecdsa );
/* set up our own sub-context if needed */
if( mbedtls_ecp_restart_enabled() &&
rs_ctx != NULL && rs_ctx->ecdsa == NULL )
{
rs_ctx->ecdsa = mbedtls_calloc( 1, sizeof( *rs_ctx->ecdsa ) );
if( rs_ctx->ecdsa == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
mbedtls_ecdsa_init( rs_ctx->ecdsa );
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( rs_ctx->ecdsa, ctx ) );
}
if( rs_ctx != NULL && rs_ctx->ecdsa != NULL )
{
/* redirect to our context */
p_ecdsa = rs_ctx->ecdsa;
}
else
{
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( p_ecdsa, ctx ) );
}
MBEDTLS_MPI_CHK( ecdsa_verify_rs_wrap( p_ecdsa, md_alg, hash, hash_len,
sig, sig_len, rs_ctx ) );
cleanup:
/* clear our sub-context when not in progress (done or error) */
if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
{
mbedtls_ecdsa_free( rs_ctx->ecdsa );
mbedtls_free( rs_ctx->ecdsa );
rs_ctx->ecdsa = NULL;
}
mbedtls_ecdsa_free( &ecdsa );
return( ret );
}
static int eckey_sign_rs_wrap( void *ctx, mbedtls_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,
void *p_rs_ctx )
{
int ret;
mbedtls_ecdsa_context ecdsa, *p_ecdsa = &ecdsa;
mbedtls_ecdsa_restart_ctx *rs_ctx = p_rs_ctx;
mbedtls_ecdsa_init( &ecdsa );
/* set up our own sub-context if needed */
if( mbedtls_ecp_restart_enabled() &&
rs_ctx != NULL && rs_ctx->ecdsa == NULL )
{
rs_ctx->ecdsa = mbedtls_calloc( 1, sizeof( *rs_ctx->ecdsa ) );
if( rs_ctx->ecdsa == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
mbedtls_ecdsa_init( rs_ctx->ecdsa );
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( rs_ctx->ecdsa, ctx ) );
}
if( rs_ctx != NULL && rs_ctx->ecdsa != NULL )
{
/* redirect to our context */
p_ecdsa = rs_ctx->ecdsa;
}
else
{
MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( p_ecdsa, ctx ) );
}
MBEDTLS_MPI_CHK( ecdsa_sign_rs_wrap( p_ecdsa, md_alg, hash, hash_len,
sig, sig_len, f_rng, p_rng, rs_ctx ) );
cleanup:
/* clear our sub-context when not in progress (done or error) */
if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
{
mbedtls_ecdsa_free( rs_ctx->ecdsa );
mbedtls_free( rs_ctx->ecdsa );
rs_ctx->ecdsa = NULL;
}
mbedtls_ecdsa_free( &ecdsa );
return( ret );
}
#endif /* MBEDTLS_ECP_RESTARTABLE */
#endif /* MBEDTLS_ECDSA_C */
static int eckey_check_pair( const void *pub, const void *prv )
{
return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
(const mbedtls_ecp_keypair *) prv ) );
}
static void *eckey_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
if( ctx != NULL )
mbedtls_ecp_keypair_init( ctx );
return( ctx );
}
static void eckey_free_wrap( void *ctx )
{
mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
mbedtls_free( ctx );
}
static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )
{
items->type = MBEDTLS_PK_DEBUG_ECP;
items->name = "eckey.Q";
items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
}
const mbedtls_pk_info_t mbedtls_eckey_info = {
MBEDTLS_PK_ECKEY,
"EC",
eckey_get_bitlen,
eckey_can_do,
#if defined(MBEDTLS_ECDSA_C)
eckey_verify_wrap,
eckey_sign_wrap,
#if defined(MBEDTLS_ECP_RESTARTABLE)
eckey_verify_rs_wrap,
eckey_sign_rs_wrap,
#endif
#else /* MBEDTLS_ECDSA_C */
NULL,
NULL,
#if defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
#endif /* MBEDTLS_ECDSA_C */
NULL,
NULL,
eckey_check_pair,
eckey_alloc_wrap,
eckey_free_wrap,
eckey_debug,
};
/*
* EC key restricted to ECDH
*/
static int eckeydh_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_ECKEY ||
type == MBEDTLS_PK_ECKEY_DH );
}
const mbedtls_pk_info_t mbedtls_eckeydh_info = {
MBEDTLS_PK_ECKEY_DH,
"EC_DH",
eckey_get_bitlen, /* Same underlying key structure */
eckeydh_can_do,
NULL,
NULL,
#if defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
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 /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_ECDSA_C)
static int ecdsa_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_ECDSA );
}
static int ecdsa_verify_wrap( void *ctx, mbedtls_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 = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
hash, hash_len, sig, sig_len );
if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
return( ret );
}
static int ecdsa_sign_wrap( void *ctx, mbedtls_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 )
{
return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,
md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );
}
#if defined(MBEDTLS_ECP_RESTARTABLE)
static int ecdsa_verify_rs_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx )
{
int ret;
((void) md_alg);
ret = mbedtls_ecdsa_read_signature_restartable(
(mbedtls_ecdsa_context *) ctx,
hash, hash_len, sig, sig_len,
(mbedtls_ecdsa_restart_ctx *) rs_ctx );
if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
return( ret );
}
static int ecdsa_sign_rs_wrap( void *ctx, mbedtls_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,
void *rs_ctx )
{
return( mbedtls_ecdsa_write_signature_restartable(
(mbedtls_ecdsa_context *) ctx,
md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng,
(mbedtls_ecdsa_restart_ctx *) rs_ctx ) );
}
#endif /* MBEDTLS_ECP_RESTARTABLE */
static void *ecdsa_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );
if( ctx != NULL )
mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );
return( ctx );
}
static void ecdsa_free_wrap( void *ctx )
{
mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );
mbedtls_free( ctx );
}
const mbedtls_pk_info_t mbedtls_ecdsa_info = {
MBEDTLS_PK_ECDSA,
"ECDSA",
eckey_get_bitlen, /* Compatible key structures */
ecdsa_can_do,
ecdsa_verify_wrap,
ecdsa_sign_wrap,
#if defined(MBEDTLS_ECP_RESTARTABLE)
ecdsa_verify_rs_wrap,
ecdsa_sign_rs_wrap,
#endif
NULL,
NULL,
eckey_check_pair, /* Compatible key structures */
ecdsa_alloc_wrap,
ecdsa_free_wrap,
eckey_debug, /* Compatible key structures */
};
#endif /* MBEDTLS_ECDSA_C */
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/*
* Support for alternative RSA-private implementations
*/
static int rsa_alt_can_do( mbedtls_pk_type_t type )
{
return( type == MBEDTLS_PK_RSA );
}
static size_t rsa_alt_get_bitlen( const void *ctx )
{
const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx;
return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
}
static int rsa_alt_sign_wrap( void *ctx, mbedtls_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 )
{
mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
#if defined(MBEDTLS_HAVE_INT64)
if( UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */
*sig_len = rsa_alt->key_len_func( rsa_alt->key );
return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_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 )
{
mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
((void) f_rng);
((void) p_rng);
if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
return( rsa_alt->decrypt_func( rsa_alt->key,
MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
}
#if defined(MBEDTLS_RSA_C)
static int rsa_alt_check_pair( const void *pub, const void *prv )
{
unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
unsigned char hash[32];
size_t sig_len = 0;
int ret;
if( rsa_alt_get_bitlen( prv ) != rsa_get_bitlen( pub ) )
return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
memset( hash, 0x2a, sizeof( hash ) );
if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,
hash, sizeof( hash ),
sig, &sig_len, NULL, NULL ) ) != 0 )
{
return( ret );
}
if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,
hash, sizeof( hash ), sig, sig_len ) != 0 )
{
return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
}
return( 0 );
}
#endif /* MBEDTLS_RSA_C */
static void *rsa_alt_alloc_wrap( void )
{
void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );
if( ctx != NULL )
memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );
return( ctx );
}
static void rsa_alt_free_wrap( void *ctx )
{
mbedtls_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );
mbedtls_free( ctx );
}
const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
MBEDTLS_PK_RSA_ALT,
"RSA-alt",
rsa_alt_get_bitlen,
rsa_alt_can_do,
NULL,
rsa_alt_sign_wrap,
#if defined(MBEDTLS_ECP_RESTARTABLE)
NULL,
NULL,
#endif
rsa_alt_decrypt_wrap,
NULL,
#if defined(MBEDTLS_RSA_C)
rsa_alt_check_pair,
#else
NULL,
#endif
rsa_alt_alloc_wrap,
rsa_alt_free_wrap,
NULL,
};
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
#endif /* MBEDTLS_PK_C */
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