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/*

 *  Public Key abstraction layer: wrapper functions

 *

 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved

 *  SPDX-License-Identifier: GPL-2.0

 *

 *  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.

 *

 *  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 

#if defined(MBEDTLS_ECP_C)

#include "mbedtls/ecp.h"

#endif

#if defined(MBEDTLS_ECDSA_C)

#include "mbedtls/ecdsa.h"

#endif

#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)

#include "mbedtls/platform_util.h"

#endif

#if defined(MBEDTLS_PLATFORM_C)

#include "mbedtls/platform.h"

#else

#include 

#define mbedtls_calloc    calloc

#define mbedtls_free       free

#endif

#include 

#include 

#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 )

{

    const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx;

    return( 8 * mbedtls_rsa_get_len( rsa ) );

}

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;

    mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;

    size_t rsa_len = mbedtls_rsa_get_len( rsa );

#if SIZE_MAX > UINT_MAX

    if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )

        return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );

#endif /* SIZE_MAX > UINT_MAX */

    if( sig_len < rsa_len )

        return( MBEDTLS_ERR_RSA_VERIFY_FAILED );

    if( ( ret = mbedtls_rsa_pkcs1_verify( rsa, NULL, NULL,

                                  MBEDTLS_RSA_PUBLIC, md_alg,

                                  (unsigned int) hash_len, hash, sig ) ) != 0 )

        return( ret );

    /* The buffer contains a valid signature followed by extra data.

     * We have a special error code for that so that so that callers can

     * use mbedtls_pk_verify() to check "Does the buffer start with a

     * valid signature?" and not just "Does the buffer contain a valid

     * signature?". */

    if( sig_len > rsa_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 )

{

    mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;

#if SIZE_MAX > UINT_MAX

    if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )

        return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );

#endif /* SIZE_MAX > UINT_MAX */

    *sig_len = mbedtls_rsa_get_len( rsa );

    return( mbedtls_rsa_pkcs1_sign( rsa, 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 )

{

    mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;

    if( ilen != mbedtls_rsa_get_len( rsa ) )

        return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    return( mbedtls_rsa_pkcs1_decrypt( rsa, 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 )

{

    mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;

    *olen = mbedtls_rsa_get_len( rsa );

    if( *olen > osize )

        return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );

    return( mbedtls_rsa_pkcs1_encrypt( rsa, 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_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)

    NULL,

    NULL,

#endif

    rsa_decrypt_wrap,

    rsa_encrypt_wrap,

    rsa_check_pair_wrap,

    rsa_alloc_wrap,

    rsa_free_wrap,

#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)

    NULL,

    NULL,

#endif

    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 );

/*

 * Restart context for ECDSA operations with ECKEY context

 *

 * We need to store an actual ECDSA context, as we need to pass the same to

 * the underlying ecdsa function, so we can't create it on the fly every time.

 */

typedef struct

{

    mbedtls_ecdsa_restart_ctx ecdsa_rs;

    mbedtls_ecdsa_context ecdsa_ctx;

} eckey_restart_ctx;

static void *eckey_rs_alloc( void )

{

    eckey_restart_ctx *rs_ctx;

    void *ctx = mbedtls_calloc( 1, sizeof( eckey_restart_ctx ) );

    if( ctx != NULL )

    {

        rs_ctx = ctx;

        mbedtls_ecdsa_restart_init( &rs_ctx->ecdsa_rs );

        mbedtls_ecdsa_init( &rs_ctx->ecdsa_ctx );

    }

    return( ctx );

}

static void eckey_rs_free( void *ctx )

{

    eckey_restart_ctx *rs_ctx;

    if( ctx == NULL)

        return;

    rs_ctx = ctx;

    mbedtls_ecdsa_restart_free( &rs_ctx->ecdsa_rs );

    mbedtls_ecdsa_free( &rs_ctx->ecdsa_ctx );

    mbedtls_free( 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 *rs_ctx )

{

    int ret;

    eckey_restart_ctx *rs = rs_ctx;

    /* Should never happen */

    if( rs == NULL )

        return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );

    /* set up our own sub-context if needed (that is, on first run) */

    if( rs->ecdsa_ctx.grp.pbits == 0 )

        MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );

    MBEDTLS_MPI_CHK( ecdsa_verify_rs_wrap( &rs->ecdsa_ctx,

                                           md_alg, hash, hash_len,

                                           sig, sig_len, &rs->ecdsa_rs ) );

cleanup:

    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 *rs_ctx )

{

    int ret;

    eckey_restart_ctx *rs = rs_ctx;

    /* Should never happen */

    if( rs == NULL )

        return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );

    /* set up our own sub-context if needed (that is, on first run) */

    if( rs->ecdsa_ctx.grp.pbits == 0 )

        MBEDTLS_MPI_CHK( mbedtls_ecdsa_from_keypair( &rs->ecdsa_ctx, ctx ) );

    MBEDTLS_MPI_CHK( ecdsa_sign_rs_wrap( &rs->ecdsa_ctx, md_alg,

                                         hash, hash_len, sig, sig_len,

                                         f_rng, p_rng, &rs->ecdsa_rs ) );

cleanup:

    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,

#endif /* MBEDTLS_ECDSA_C */

    NULL,

    NULL,

    eckey_check_pair,

    eckey_alloc_wrap,

    eckey_free_wrap,

#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)

    eckey_rs_alloc,

    eckey_rs_free,

#endif

    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_ECDSA_C) && 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 */

#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)

    NULL,

    NULL,

#endif

    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 );

}

#if defined(MBEDTLS_ECP_RESTARTABLE)

static void *ecdsa_rs_alloc( void )

{

    void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_restart_ctx ) );

    if( ctx != NULL )

        mbedtls_ecdsa_restart_init( ctx );

    return( ctx );

}

static void ecdsa_rs_free( void *ctx )

{

    mbedtls_ecdsa_restart_free( ctx );

    mbedtls_free( ctx );

}

#endif /* MBEDTLS_ECP_RESTARTABLE */

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,

#if defined(MBEDTLS_ECP_RESTARTABLE)

    ecdsa_rs_alloc,

    ecdsa_rs_free,

#endif

    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 SIZE_MAX > UINT_MAX

    if( UINT_MAX < hash_len )

        return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );

#endif /* SIZE_MAX > UINT_MAX */

    *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_platform_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_ECDSA_C) && 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,

#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)

    NULL,

    NULL,

#endif

    NULL,

};

#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */

#endif /* MBEDTLS_PK_C */