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/*

 *  Diffie-Hellman-Merkle key exchange

 *

 *  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)

 */

/*

 *  The following sources were referenced in the design of this implementation

 *  of the Diffie-Hellman-Merkle algorithm:

 *

 *  [1] Handbook of Applied Cryptography - 1997, Chapter 12

 *      Menezes, van Oorschot and Vanstone

 *

 */

#if !defined(MBEDTLS_CONFIG_FILE)

#include "mbedtls/config.h"

#else

#include MBEDTLS_CONFIG_FILE

#endif

#if defined(MBEDTLS_DHM_C)

#include "mbedtls/dhm.h"

#include "mbedtls/platform_util.h"

#include 

#if defined(MBEDTLS_PEM_PARSE_C)

#include "mbedtls/pem.h"

#endif

#if defined(MBEDTLS_ASN1_PARSE_C)

#include "mbedtls/asn1.h"

#endif

#if defined(MBEDTLS_PLATFORM_C)

#include "mbedtls/platform.h"

#else

#include 

#include 

#define mbedtls_printf     printf

#define mbedtls_calloc    calloc

#define mbedtls_free       free

#endif

#if !defined(MBEDTLS_DHM_ALT)

#define DHM_VALIDATE_RET( cond )    \

    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_DHM_BAD_INPUT_DATA )

#define DHM_VALIDATE( cond )        \

    MBEDTLS_INTERNAL_VALIDATE( cond )

/*

 * helper to validate the mbedtls_mpi size and import it

 */

static int dhm_read_bignum( mbedtls_mpi *X,

                            unsigned char **p,

                            const unsigned char *end )

{

    int ret, n;

    if( end - *p < 2 )

        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );

    n = ( (*p)[0] << 8 ) | (*p)[1];

    (*p) += 2;

    if( (int)( end - *p ) < n )

        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );

    if( ( ret = mbedtls_mpi_read_binary( X, *p, n ) ) != 0 )

        return( MBEDTLS_ERR_DHM_READ_PARAMS_FAILED + ret );

    (*p) += n;

    return( 0 );

}

/*

 * Verify sanity of parameter with regards to P

 *

 * Parameter should be: 2 <= public_param <= P - 2

 *

 * This means that we need to return an error if

 *              public_param < 2 or public_param > P-2

 *

 * For more information on the attack, see:

 *  http://www.cl.cam.ac.uk/~rja14/Papers/psandqs.pdf

 *  http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2005-2643

 */

static int dhm_check_range( const mbedtls_mpi *param, const mbedtls_mpi *P )

{

    mbedtls_mpi L, U;

    int ret = 0;

    mbedtls_mpi_init( &L ); mbedtls_mpi_init( &U );

    MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &L, 2 ) );

    MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &U, P, 2 ) );

    if( mbedtls_mpi_cmp_mpi( param, &L ) < 0 ||

        mbedtls_mpi_cmp_mpi( param, &U ) > 0 )

    {

        ret = MBEDTLS_ERR_DHM_BAD_INPUT_DATA;

    }

cleanup:

    mbedtls_mpi_free( &L ); mbedtls_mpi_free( &U );

    return( ret );

}

void mbedtls_dhm_init( mbedtls_dhm_context *ctx )

{

    DHM_VALIDATE( ctx != NULL );

    memset( ctx, 0, sizeof( mbedtls_dhm_context ) );

}

/*

 * Parse the ServerKeyExchange parameters

 */

int mbedtls_dhm_read_params( mbedtls_dhm_context *ctx,

                     unsigned char **p,

                     const unsigned char *end )

{

    int ret;

    DHM_VALIDATE_RET( ctx != NULL );

    DHM_VALIDATE_RET( p != NULL && *p != NULL );

    DHM_VALIDATE_RET( end != NULL );

    if( ( ret = dhm_read_bignum( &ctx->P,  p, end ) ) != 0 ||

        ( ret = dhm_read_bignum( &ctx->G,  p, end ) ) != 0 ||

        ( ret = dhm_read_bignum( &ctx->GY, p, end ) ) != 0 )

        return( ret );

    if( ( ret = dhm_check_range( &ctx->GY, &ctx->P ) ) != 0 )

        return( ret );

    ctx->len = mbedtls_mpi_size( &ctx->P );

    return( 0 );

}

/*

 * Setup and write the ServerKeyExchange parameters

 */

int mbedtls_dhm_make_params( mbedtls_dhm_context *ctx, int x_size,

                     unsigned char *output, size_t *olen,

                     int (*f_rng)(void *, unsigned char *, size_t),

                     void *p_rng )

{

    int ret, count = 0;

    size_t n1, n2, n3;

    unsigned char *p;

    DHM_VALIDATE_RET( ctx != NULL );

    DHM_VALIDATE_RET( output != NULL );

    DHM_VALIDATE_RET( olen != NULL );

    DHM_VALIDATE_RET( f_rng != NULL );

    if( mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 )

        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );

    /*

     * Generate X as large as possible ( < P )

     */

    do

    {

        MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ) );

        while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )

            MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) );

        if( count++ > 10 )

            return( MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED );

    }

    while( dhm_check_range( &ctx->X, &ctx->P ) != 0 );

    /*

     * Calculate GX = G^X mod P

     */

    MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->GX, &ctx->G, &ctx->X,

                          &ctx->P , &ctx->RP ) );

    if( ( ret = dhm_check_range( &ctx->GX, &ctx->P ) ) != 0 )

        return( ret );

    /*

     * export P, G, GX

     */

#define DHM_MPI_EXPORT( X, n )                                          \

    do {                                                                \

        MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( ( X ),               \

                                                   p + 2,               \

                                                   ( n ) ) );           \

        *p++ = (unsigned char)( ( n ) >> 8 );                           \

        *p++ = (unsigned char)( ( n )      );                           \

        p += ( n );                                                     \

    } while( 0 )

    n1 = mbedtls_mpi_size( &ctx->P  );

    n2 = mbedtls_mpi_size( &ctx->G  );

    n3 = mbedtls_mpi_size( &ctx->GX );

    p = output;

    DHM_MPI_EXPORT( &ctx->P , n1 );

    DHM_MPI_EXPORT( &ctx->G , n2 );

    DHM_MPI_EXPORT( &ctx->GX, n3 );

    *olen = p - output;

    ctx->len = n1;

cleanup:

    if( ret != 0 )

        return( MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED + ret );

    return( 0 );

}

/*

 * Set prime modulus and generator

 */

int mbedtls_dhm_set_group( mbedtls_dhm_context *ctx,

                           const mbedtls_mpi *P,

                           const mbedtls_mpi *G )

{

    int ret;

    DHM_VALIDATE_RET( ctx != NULL );

    DHM_VALIDATE_RET( P != NULL );

    DHM_VALIDATE_RET( G != NULL );

    if( ( ret = mbedtls_mpi_copy( &ctx->P, P ) ) != 0 ||

        ( ret = mbedtls_mpi_copy( &ctx->G, G ) ) != 0 )

    {

        return( MBEDTLS_ERR_DHM_SET_GROUP_FAILED + ret );

    }

    ctx->len = mbedtls_mpi_size( &ctx->P );

    return( 0 );

}

/*

 * Import the peer's public value G^Y

 */

int mbedtls_dhm_read_public( mbedtls_dhm_context *ctx,

                     const unsigned char *input, size_t ilen )

{

    int ret;

    DHM_VALIDATE_RET( ctx != NULL );

    DHM_VALIDATE_RET( input != NULL );

    if( ilen < 1 || ilen > ctx->len )

        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );

    if( ( ret = mbedtls_mpi_read_binary( &ctx->GY, input, ilen ) ) != 0 )

        return( MBEDTLS_ERR_DHM_READ_PUBLIC_FAILED + ret );

    return( 0 );

}

/*

 * Create own private value X and export G^X

 */

int mbedtls_dhm_make_public( mbedtls_dhm_context *ctx, int x_size,

                     unsigned char *output, size_t olen,

                     int (*f_rng)(void *, unsigned char *, size_t),

                     void *p_rng )

{

    int ret, count = 0;

    DHM_VALIDATE_RET( ctx != NULL );

    DHM_VALIDATE_RET( output != NULL );

    DHM_VALIDATE_RET( f_rng != NULL );

    if( olen < 1 || olen > ctx->len )

        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );

    if( mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 )

        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );

    /*

     * generate X and calculate GX = G^X mod P

     */

    do

    {

        MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ) );

        while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )

            MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) );

        if( count++ > 10 )

            return( MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED );

    }

    while( dhm_check_range( &ctx->X, &ctx->P ) != 0 );

    MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->GX, &ctx->G, &ctx->X,

                          &ctx->P , &ctx->RP ) );

    if( ( ret = dhm_check_range( &ctx->GX, &ctx->P ) ) != 0 )

        return( ret );

    MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &ctx->GX, output, olen ) );

cleanup:

    if( ret != 0 )

        return( MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED + ret );

    return( 0 );

}

/*

 * Use the blinding method and optimisation suggested in section 10 of:

 *  KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA,

 *  DSS, and other systems. In : Advances in Cryptology-CRYPTO'96. Springer

 *  Berlin Heidelberg, 1996. p. 104-113.

 */

static int dhm_update_blinding( mbedtls_dhm_context *ctx,

                    int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )

{

    int ret, count;

    /*

     * Don't use any blinding the first time a particular X is used,

     * but remember it to use blinding next time.

     */

    if( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->pX ) != 0 )

    {

        MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &ctx->pX, &ctx->X ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx->Vi, 1 ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx->Vf, 1 ) );

        return( 0 );

    }

    /*

     * Ok, we need blinding. Can we re-use existing values?

     * If yes, just update them by squaring them.

     */

    if( mbedtls_mpi_cmp_int( &ctx->Vi, 1 ) != 0 )

    {

        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vi, &ctx->Vi, &ctx->Vi ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vi, &ctx->Vi, &ctx->P ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vf, &ctx->Vf, &ctx->Vf ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vf, &ctx->Vf, &ctx->P ) );

        return( 0 );

    }

    /*

     * We need to generate blinding values from scratch

     */

    /* Vi = random( 2, P-1 ) */

    count = 0;

    do

    {

        MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->Vi, mbedtls_mpi_size( &ctx->P ), f_rng, p_rng ) );

        while( mbedtls_mpi_cmp_mpi( &ctx->Vi, &ctx->P ) >= 0 )

            MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->Vi, 1 ) );

        if( count++ > 10 )

            return( MBEDTLS_ERR_MPI_NOT_ACCEPTABLE );

    }

    while( mbedtls_mpi_cmp_int( &ctx->Vi, 1 ) <= 0 );

    /* Vf = Vi^-X mod P */

    MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->Vf, &ctx->Vi, &ctx->P ) );

    MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->Vf, &ctx->Vf, &ctx->X, &ctx->P, &ctx->RP ) );

cleanup:

    return( ret );

}

/*

 * Derive and export the shared secret (G^Y)^X mod P

 */

int mbedtls_dhm_calc_secret( mbedtls_dhm_context *ctx,

                     unsigned char *output, size_t output_size, size_t *olen,

                     int (*f_rng)(void *, unsigned char *, size_t),

                     void *p_rng )

{

    int ret;

    mbedtls_mpi GYb;

    DHM_VALIDATE_RET( ctx != NULL );

    DHM_VALIDATE_RET( output != NULL );

    DHM_VALIDATE_RET( olen != NULL );

    if( output_size < ctx->len )

        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );

    if( ( ret = dhm_check_range( &ctx->GY, &ctx->P ) ) != 0 )

        return( ret );

    mbedtls_mpi_init( &GYb );

    /* Blind peer's value */

    if( f_rng != NULL )

    {

        MBEDTLS_MPI_CHK( dhm_update_blinding( ctx, f_rng, p_rng ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &GYb, &ctx->GY, &ctx->Vi ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &GYb, &GYb, &ctx->P ) );

    }

    else

        MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &GYb, &ctx->GY ) );

    /* Do modular exponentiation */

    MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->K, &GYb, &ctx->X,

                          &ctx->P, &ctx->RP ) );

    /* Unblind secret value */

    if( f_rng != NULL )

    {

        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->K, &ctx->K, &ctx->Vf ) );

        MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->K, &ctx->K, &ctx->P ) );

    }

    *olen = mbedtls_mpi_size( &ctx->K );

    MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &ctx->K, output, *olen ) );

cleanup:

    mbedtls_mpi_free( &GYb );

    if( ret != 0 )

        return( MBEDTLS_ERR_DHM_CALC_SECRET_FAILED + ret );

    return( 0 );

}

/*

 * Free the components of a DHM key

 */

void mbedtls_dhm_free( mbedtls_dhm_context *ctx )

{

    if( ctx == NULL )

        return;

    mbedtls_mpi_free( &ctx->pX );

    mbedtls_mpi_free( &ctx->Vf );

    mbedtls_mpi_free( &ctx->Vi );

    mbedtls_mpi_free( &ctx->RP );

    mbedtls_mpi_free( &ctx->K  );

    mbedtls_mpi_free( &ctx->GY );

    mbedtls_mpi_free( &ctx->GX );

    mbedtls_mpi_free( &ctx->X  );

    mbedtls_mpi_free( &ctx->G  );

    mbedtls_mpi_free( &ctx->P  );

    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_dhm_context ) );

}

#if defined(MBEDTLS_ASN1_PARSE_C)

/*

 * Parse DHM parameters

 */

int mbedtls_dhm_parse_dhm( mbedtls_dhm_context *dhm, const unsigned char *dhmin,

                   size_t dhminlen )

{

    int ret;

    size_t len;

    unsigned char *p, *end;

#if defined(MBEDTLS_PEM_PARSE_C)

    mbedtls_pem_context pem;

#endif /* MBEDTLS_PEM_PARSE_C */

    DHM_VALIDATE_RET( dhm != NULL );

    DHM_VALIDATE_RET( dhmin != NULL );

#if defined(MBEDTLS_PEM_PARSE_C)

    mbedtls_pem_init( &pem );

    /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */

    if( dhminlen == 0 || dhmin[dhminlen - 1] != '\0' )

        ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;

    else

        ret = mbedtls_pem_read_buffer( &pem,

                               "-----BEGIN DH PARAMETERS-----",

                               "-----END DH PARAMETERS-----",

                               dhmin, NULL, 0, &dhminlen );

    if( ret == 0 )

    {

        /*

         * Was PEM encoded

         */

        dhminlen = pem.buflen;

    }

    else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )

        goto exit;

    p = ( ret == 0 ) ? pem.buf : (unsigned char *) dhmin;

#else

    p = (unsigned char *) dhmin;

#endif /* MBEDTLS_PEM_PARSE_C */

    end = p + dhminlen;

    /*

     *  DHParams ::= SEQUENCE {

     *      prime              INTEGER,  -- P

     *      generator          INTEGER,  -- g

     *      privateValueLength INTEGER OPTIONAL

     *  }

     */

    if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,

            MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )

    {

        ret = MBEDTLS_ERR_DHM_INVALID_FORMAT + ret;

        goto exit;

    }

    end = p + len;

    if( ( ret = mbedtls_asn1_get_mpi( &p, end, &dhm->P  ) ) != 0 ||

        ( ret = mbedtls_asn1_get_mpi( &p, end, &dhm->G ) ) != 0 )

    {

        ret = MBEDTLS_ERR_DHM_INVALID_FORMAT + ret;

        goto exit;

    }

    if( p != end )

    {

        /* This might be the optional privateValueLength.

         * If so, we can cleanly discard it */

        mbedtls_mpi rec;

        mbedtls_mpi_init( &rec );

        ret = mbedtls_asn1_get_mpi( &p, end, &rec );

        mbedtls_mpi_free( &rec );

        if ( ret != 0 )

        {

            ret = MBEDTLS_ERR_DHM_INVALID_FORMAT + ret;

            goto exit;

        }

        if ( p != end )

        {

            ret = MBEDTLS_ERR_DHM_INVALID_FORMAT +

                MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;

            goto exit;

        }

    }

    ret = 0;

    dhm->len = mbedtls_mpi_size( &dhm->P );

exit:

#if defined(MBEDTLS_PEM_PARSE_C)

    mbedtls_pem_free( &pem );

#endif

    if( ret != 0 )

        mbedtls_dhm_free( dhm );

    return( ret );

}

#if defined(MBEDTLS_FS_IO)

/*

 * Load all data from a file into a given buffer.

 *

 * The file is expected to contain either PEM or DER encoded data.

 * A terminating null byte is always appended. It is included in the announced

 * length only if the data looks like it is PEM encoded.

 */

static int load_file( const char *path, unsigned char **buf, size_t *n )

{

    FILE *f;

    long size;

    if( ( f = fopen( path, "rb" ) ) == NULL )

        return( MBEDTLS_ERR_DHM_FILE_IO_ERROR );

    fseek( f, 0, SEEK_END );

    if( ( size = ftell( f ) ) == -1 )

    {

        fclose( f );

        return( MBEDTLS_ERR_DHM_FILE_IO_ERROR );

    }

    fseek( f, 0, SEEK_SET );

    *n = (size_t) size;

    if( *n + 1 == 0 ||

        ( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )

    {

        fclose( f );

        return( MBEDTLS_ERR_DHM_ALLOC_FAILED );

    }

    if( fread( *buf, 1, *n, f ) != *n )

    {

        fclose( f );

        mbedtls_platform_zeroize( *buf, *n + 1 );

        mbedtls_free( *buf );

        return( MBEDTLS_ERR_DHM_FILE_IO_ERROR );

    }

    fclose( f );

    (*buf)[*n] = '\0';

    if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )

        ++*n;

    return( 0 );

}

/*

 * Load and parse DHM parameters

 */

int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context *dhm, const char *path )

{

    int ret;

    size_t n;

    unsigned char *buf;

    DHM_VALIDATE_RET( dhm != NULL );

    DHM_VALIDATE_RET( path != NULL );

    if( ( ret = load_file( path, &buf, &n ) ) != 0 )

        return( ret );

    ret = mbedtls_dhm_parse_dhm( dhm, buf, n );

    mbedtls_platform_zeroize( buf, n );

    mbedtls_free( buf );

    return( ret );

}

#endif /* MBEDTLS_FS_IO */

#endif /* MBEDTLS_ASN1_PARSE_C */

#endif /* MBEDTLS_DHM_ALT */

#if defined(MBEDTLS_SELF_TEST)

#if defined(MBEDTLS_PEM_PARSE_C)

static const char mbedtls_test_dhm_params[] =

"-----BEGIN DH PARAMETERS-----\r\n"

"MIGHAoGBAJ419DBEOgmQTzo5qXl5fQcN9TN455wkOL7052HzxxRVMyhYmwQcgJvh\r\n"

"1sa18fyfR9OiVEMYglOpkqVoGLN7qd5aQNNi5W7/C+VBdHTBJcGZJyyP5B3qcz32\r\n"

"9mLJKudlVudV0Qxk5qUJaPZ/xupz0NyoVpviuiBOI1gNi8ovSXWzAgEC\r\n"

"-----END DH PARAMETERS-----\r\n";

#else /* MBEDTLS_PEM_PARSE_C */

static const char mbedtls_test_dhm_params[] = {

  0x30, 0x81, 0x87, 0x02, 0x81, 0x81, 0x00, 0x9e, 0x35, 0xf4, 0x30, 0x44,

  0x3a, 0x09, 0x90, 0x4f, 0x3a, 0x39, 0xa9, 0x79, 0x79, 0x7d, 0x07, 0x0d,

  0xf5, 0x33, 0x78, 0xe7, 0x9c, 0x24, 0x38, 0xbe, 0xf4, 0xe7, 0x61, 0xf3,

  0xc7, 0x14, 0x55, 0x33, 0x28, 0x58, 0x9b, 0x04, 0x1c, 0x80, 0x9b, 0xe1,

  0xd6, 0xc6, 0xb5, 0xf1, 0xfc, 0x9f, 0x47, 0xd3, 0xa2, 0x54, 0x43, 0x18,

  0x82, 0x53, 0xa9, 0x92, 0xa5, 0x68, 0x18, 0xb3, 0x7b, 0xa9, 0xde, 0x5a,

  0x40, 0xd3, 0x62, 0xe5, 0x6e, 0xff, 0x0b, 0xe5, 0x41, 0x74, 0x74, 0xc1,

  0x25, 0xc1, 0x99, 0x27, 0x2c, 0x8f, 0xe4, 0x1d, 0xea, 0x73, 0x3d, 0xf6,

  0xf6, 0x62, 0xc9, 0x2a, 0xe7, 0x65, 0x56, 0xe7, 0x55, 0xd1, 0x0c, 0x64,

  0xe6, 0xa5, 0x09, 0x68, 0xf6, 0x7f, 0xc6, 0xea, 0x73, 0xd0, 0xdc, 0xa8,

  0x56, 0x9b, 0xe2, 0xba, 0x20, 0x4e, 0x23, 0x58, 0x0d, 0x8b, 0xca, 0x2f,

  0x49, 0x75, 0xb3, 0x02, 0x01, 0x02 };

#endif /* MBEDTLS_PEM_PARSE_C */

static const size_t mbedtls_test_dhm_params_len = sizeof( mbedtls_test_dhm_params );

/*

 * Checkup routine

 */

int mbedtls_dhm_self_test( int verbose )

{

    int ret;

    mbedtls_dhm_context dhm;

    mbedtls_dhm_init( &dhm );

    if( verbose != 0 )

        mbedtls_printf( "  DHM parameter load: " );

    if( ( ret = mbedtls_dhm_parse_dhm( &dhm,

                    (const unsigned char *) mbedtls_test_dhm_params,

                    mbedtls_test_dhm_params_len ) ) != 0 )

    {

        if( verbose != 0 )

            mbedtls_printf( "failed\n" );

        ret = 1;

        goto exit;

    }

    if( verbose != 0 )

        mbedtls_printf( "passed\n\n" );

exit:

    mbedtls_dhm_free( &dhm );

    return( ret );

}

#endif /* MBEDTLS_SELF_TEST */

#endif /* MBEDTLS_DHM_C */