xref: /OK3568_Linux_fs/external/security/librkcrypto/test/c_mode/ecdsa.c (revision 4882a59341e53eb6f0b4789bf948001014eff981)

/*
 *  Elliptic curve DSA
 *
 *  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)
 */

/*
 * References:
 *
 * SEC1 http://www.secg.org/index.php?action=secg,docs_secg
 */

#define MBEDTLS_ECDSA_C
#if defined(MBEDTLS_ECDSA_C)
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "ecdsa.h"
#include "asn1write.h"

#include <string.h>

#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
#include "mbedtls/hmac_drbg.h"
#endif

#define DEBUG(format,...) printf("[%s]:%d: "format"\n", __func__,__LINE__, ##__VA_ARGS__)

/*
 * Derive a suitable integer for group grp from a buffer of length len
 * SEC1 4.1.3 step 5 aka SEC1 4.1.4 step 3
 */
static int derive_mpi( const mbedtls_ecp_group *grp, mbedtls_mpi *x,
                       const unsigned char *buf, size_t blen )
{
    int ret;
    size_t n_size = ( grp->nbits + 7 ) / 8;
    size_t use_size = blen > n_size ? n_size : blen;

    MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( x, buf, use_size ) );
    if( use_size * 8 > grp->nbits )
        MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( x, use_size * 8 - grp->nbits ) );

    /* While at it, reduce modulo N */
    if( mbedtls_mpi_cmp_mpi( x, &grp->N ) >= 0 )
        MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( x, x, &grp->N ) );

cleanup:
    return( ret );
}

/*
 * Compute ECDSA signature of a hashed message (SEC1 4.1.3)
 * Obviously, compared to SEC1 4.1.3, we skip step 4 (hash message)
 */
int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
                const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
                int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
    int ret, key_tries, sign_tries, blind_tries;
    mbedtls_ecp_point R;
    mbedtls_mpi k, e, t;

    /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
    if( grp->N.p == NULL )
        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );

    mbedtls_ecp_point_init( &R );
    mbedtls_mpi_init( &k ); mbedtls_mpi_init( &e ); mbedtls_mpi_init( &t );

    sign_tries = 0;
    do
    {
        /*
         * Steps 1-3: generate a suitable ephemeral keypair
         * and set r = xR mod n
         */
        key_tries = 0;
        do
        {
            MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair( grp, &k, &R, f_rng, p_rng ) );
            MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( r, &R.X, &grp->N ) );

            if( key_tries++ > 10 )
            {
                ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
                goto cleanup;
            }
        }
        while( mbedtls_mpi_cmp_int( r, 0 ) == 0 );

        /*
         * Step 5: derive MPI from hashed message
         */
        MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) );

        /*
         * Generate a random value to blind inv_mod in next step,
         * avoiding a potential timing leak.
         */
        blind_tries = 0;
        do
        {
            size_t n_size = ( grp->nbits + 7 ) / 8;
            MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &t, n_size, f_rng, p_rng ) );
            MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &t, 8 * n_size - grp->nbits ) );

            /* See mbedtls_ecp_gen_keypair() */
            if( ++blind_tries > 30 )
                return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
        }
        while( mbedtls_mpi_cmp_int( &t, 1 ) < 0 ||
               mbedtls_mpi_cmp_mpi( &t, &grp->N ) >= 0 );

        /*
         * Step 6: compute s = (e + r * d) / k = t (e + rd) / (kt) mod n
         */
        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, r, d ) );
        MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &e, &e, s ) );
        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &e, &e, &t ) );
        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &k, &k, &t ) );
        MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( s, &k, &grp->N ) );
        MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( s, s, &e ) );
        MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( s, s, &grp->N ) );

        if( sign_tries++ > 10 )
        {
            ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
            goto cleanup;
        }
    }
    while( mbedtls_mpi_cmp_int( s, 0 ) == 0 );

cleanup:
    mbedtls_ecp_point_free( &R );
    mbedtls_mpi_free( &k ); mbedtls_mpi_free( &e ); mbedtls_mpi_free( &t );

    return( ret );
}

#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
/*
 * Deterministic signature wrapper
 */
int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
                    const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
                    mbedtls_md_type_t md_alg )
{
    int ret;
    mbedtls_hmac_drbg_context rng_ctx;
    unsigned char data[2 * MBEDTLS_ECP_MAX_BYTES];
    size_t grp_len = ( grp->nbits + 7 ) / 8;
    const mbedtls_md_info_t *md_info;
    mbedtls_mpi h;

    if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );

    mbedtls_mpi_init( &h );
    mbedtls_hmac_drbg_init( &rng_ctx );

    /* Use private key and message hash (reduced) to initialize HMAC_DRBG */
    MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( d, data, grp_len ) );
    MBEDTLS_MPI_CHK( derive_mpi( grp, &h, buf, blen ) );
    MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, data + grp_len, grp_len ) );
    mbedtls_hmac_drbg_seed_buf( &rng_ctx, md_info, data, 2 * grp_len );

    ret = mbedtls_ecdsa_sign( grp, r, s, d, buf, blen,
                      mbedtls_hmac_drbg_random, &rng_ctx );

cleanup:
    mbedtls_hmac_drbg_free( &rng_ctx );
    mbedtls_mpi_free( &h );

    return( ret );
}
#endif /* MBEDTLS_ECDSA_DETERMINISTIC */

/*
 * Verify ECDSA signature of hashed message (SEC1 4.1.4)
 * Obviously, compared to SEC1 4.1.3, we skip step 2 (hash message)
 */
int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
                  const unsigned char *buf, size_t blen,
                  const mbedtls_ecp_point *Q, const mbedtls_mpi *r, const mbedtls_mpi *s)
{
    int ret;
    mbedtls_mpi e, s_inv, u1, u2;
    mbedtls_ecp_point R;

    mbedtls_ecp_point_init( &R );
    mbedtls_mpi_init( &e ); mbedtls_mpi_init( &s_inv ); mbedtls_mpi_init( &u1 ); mbedtls_mpi_init( &u2 );

    /* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
    if( grp->N.p == NULL )
        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );

    /*
     * Step 1: make sure r and s are in range 1..n-1
     */
    if( mbedtls_mpi_cmp_int( r, 1 ) < 0 || mbedtls_mpi_cmp_mpi( r, &grp->N ) >= 0 ||
        mbedtls_mpi_cmp_int( s, 1 ) < 0 || mbedtls_mpi_cmp_mpi( s, &grp->N ) >= 0 )
    {
        ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
        goto cleanup;
    }

    /*
     * Additional precaution: make sure Q is valid
     */
    MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey( grp, Q ) );

    /*
     * Step 3: derive MPI from hashed message
     */
    MBEDTLS_MPI_CHK( derive_mpi( grp, &e, buf, blen ) );

    /*
     * Step 4: u1 = e / s mod n, u2 = r / s mod n
     */
    MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &s_inv, s, &grp->N ) );

    MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u1, &e, &s_inv ) );
    MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u1, &u1, &grp->N ) );

    MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &u2, r, &s_inv ) );
    MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &u2, &u2, &grp->N ) );

    /*
     * Step 5: R = u1 G + u2 Q
     *
     * Since we're not using any secret data, no need to pass a RNG to
     * mbedtls_ecp_mul() for countermesures.
     */
    MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, &R, &u1, &grp->G, &u2, Q ) );

    if( mbedtls_ecp_is_zero( &R ) )
    {
        ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
        goto cleanup;
    }

    /*
     * Step 6: convert xR to an integer (no-op)
     * Step 7: reduce xR mod n (gives v)
     */
    MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &R.X, &R.X, &grp->N ) );

    /*
     * Step 8: check if v (that is, R.X) is equal to r
     */
    if( mbedtls_mpi_cmp_mpi( &R.X, r ) != 0 )
    {
        ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
        goto cleanup;
    }

cleanup:
    mbedtls_ecp_point_free( &R );
    mbedtls_mpi_free( &e ); mbedtls_mpi_free( &s_inv ); mbedtls_mpi_free( &u1 ); mbedtls_mpi_free( &u2 );

    return( ret );
}

/*
 * Convert a signature (given by context) to ASN.1
 */
static int ecdsa_signature_to_asn1( const mbedtls_mpi *r, const mbedtls_mpi *s,
                                    unsigned char *sig, size_t *slen )
{
    int ret;
    unsigned char buf[MBEDTLS_ECDSA_MAX_LEN];
    unsigned char *p = buf + sizeof( buf );
    size_t len = 0;

    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, s ) );
    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &p, buf, r ) );

    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &p, buf, len ) );
    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &p, buf,
                                       MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );

    memcpy( sig, p, len );
    *slen = len;

    return( 0 );
}

/*
 * Compute and write signature
 */
int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t md_alg,
                           const unsigned char *hash, size_t hlen,
                           unsigned char *sig, size_t *slen,
                           int (*f_rng)(void *, unsigned char *, size_t),
                           void *p_rng )
{
    int ret;
    mbedtls_mpi r, s;

    mbedtls_mpi_init( &r );
    mbedtls_mpi_init( &s );

#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
    (void) f_rng;
    (void) p_rng;

    MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det( &ctx->grp, &r, &s, &ctx->d,
                             hash, hlen, md_alg ) );
#else
    (void) md_alg;

    MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ctx->grp, &r, &s, &ctx->d,
                         hash, hlen, f_rng, p_rng ) );
#endif

    MBEDTLS_MPI_CHK( ecdsa_signature_to_asn1( &r, &s, sig, slen ) );

cleanup:
    mbedtls_mpi_free( &r );
    mbedtls_mpi_free( &s );

    return( ret );
}

#if ! defined(MBEDTLS_DEPRECATED_REMOVED) && \
    defined(MBEDTLS_ECDSA_DETERMINISTIC)
int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
                               const unsigned char *hash, size_t hlen,
                               unsigned char *sig, size_t *slen,
                               mbedtls_md_type_t md_alg )
{
    return( mbedtls_ecdsa_write_signature( ctx, md_alg, hash, hlen, sig, slen,
                                   NULL, NULL ) );
}
#endif

/*
 * Read and check signature
 */
int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
                          const unsigned char *hash, size_t hlen,
                          const unsigned char *sig, size_t slen )
{
    int ret;
    unsigned char *p = (unsigned char *) sig;
    const unsigned char *end = sig + slen;
    size_t len;
    mbedtls_mpi r, s;

    mbedtls_mpi_init( &r );
    mbedtls_mpi_init( &s );

    if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
                    MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
    {
        ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
        goto cleanup;
    }

    if( p + len != end )
    {
        ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA +
              MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
        goto cleanup;
    }

    if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 ||
        ( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 )
    {
        ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
        goto cleanup;
    }

    if( ( ret = mbedtls_ecdsa_verify( &ctx->grp, hash, hlen,
                              &ctx->Q, &r, &s ) ) != 0 )
        goto cleanup;

    if( p != end )
        ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;

cleanup:
    mbedtls_mpi_free( &r );
    mbedtls_mpi_free( &s );

    return( ret );
}

/*
 * Generate key pair
 */
int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
                  int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
    return( mbedtls_ecp_group_load( &ctx->grp, gid ) ||
            mbedtls_ecp_gen_keypair( &ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng ) );
}

/*
 * Set context from an mbedtls_ecp_keypair
 */
int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key )
{
    int ret;

    if( ( ret = mbedtls_ecp_group_copy( &ctx->grp, &key->grp ) ) != 0 ||
        ( ret = mbedtls_mpi_copy( &ctx->d, &key->d ) ) != 0 ||
        ( ret = mbedtls_ecp_copy( &ctx->Q, &key->Q ) ) != 0 )
    {
        mbedtls_ecdsa_free( ctx );
    }

    return( ret );
}

/*
 * Initialize context
 */
void mbedtls_ecdsa_init( mbedtls_ecdsa_context *ctx )
{
    mbedtls_ecp_keypair_init( ctx );
}

/*
 * Free context
 */
void mbedtls_ecdsa_free( mbedtls_ecdsa_context *ctx )
{
    mbedtls_ecp_keypair_free( ctx );
}

static int rnd_std_rand( void *rng_state, unsigned char *output, size_t len )
{
    size_t i;
	static int srand_flag = 1;

	if(srand_flag) {
		//srand(time(NULL));//������������ӡ�
		srand(rand()+rand()+rand()+rand()*rand());
		srand_flag = 0;
	}

    for( i = 0; i < len; ++i )
        output[i] = rand();
    return( 0 );
}

#if 0
int rk_ecdsa_sign(mbed_ecc_key_t *ec_key, unsigned char *hash, unsigned int hash_len,
											unsigned char *sig, unsigned int *sig_len)
{
	int ret;
	mbedtls_ecp_group grp;
	mbedtls_mpi r, s, d;
	mbedtls_ecp_group_id gid;

	mbedtls_mpi_init(&r);
    mbedtls_mpi_init(&s);
	mbedtls_mpi_init(&d);
	mbedtls_ecp_group_init(&grp);

	DEBUG("ec_key->curve = %d", ec_key->curve );
	mbedtls_ecp_group_load(&grp, ec_key->curve);

	MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(grp, &r, &s, d, hash, hash_len, rnd_std_rand, NULL));
    MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, sig_len ));

cleanup:
	mbedtls_mpi_free(&r);
    mbedtls_mpi_free(&s);
	mbedtls_mpi_free(&d);
	mbedtls_ecp_group_free(&grp);
    return ret;
}
#endif

int rk_ecdsa_sign(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
						unsigned char *sig, size_t *sig_len)
{
    int ret = -1;
	mbedtls_ecp_group grp;
	mbedtls_mpi r, s;
    mbedtls_mpi pri_key;

	mbedtls_ecp_group_init( &grp );
    mbedtls_mpi_init( &pri_key);
	mbedtls_mpi_init(&r);
    mbedtls_mpi_init(&s);

	MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pri_key, key->d, key->d_len) );

    if(mbedtls_ecp_check_privkey( &grp, &pri_key) != 0)
    {
    	printf("mbedtls_ecp_check_privkey error\n");
        return -1;
    }

	MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(&grp, &r, &s, &pri_key, hash, hash_len, rnd_std_rand, NULL));
	MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, sig_len ));
cleanup:
	mbedtls_mpi_free(&r);
    mbedtls_mpi_free(&s);
	mbedtls_ecp_group_free( &grp );
    mbedtls_mpi_free( &pri_key);
	return ret;
}

int rk_ecdsa_verify(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
						unsigned char *sig, unsigned int sig_len)
{
    int ret = -1;
	mbedtls_ecp_group grp;
	unsigned char *p = (unsigned char *) sig;
    const unsigned char *end = sig + sig_len;
    size_t len;
	mbedtls_mpi r, s;
    mbedtls_ecp_point pub_key;

	mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &pub_key);
	mbedtls_mpi_init(&r);
    mbedtls_mpi_init(&s);

	MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.X, key->x, key->x_len) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.Y, key->y, key->y_len) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pub_key.Z, 1 ));

    if(mbedtls_ecp_check_pubkey( &grp, &pub_key) != 0)
    {
    	printf("mbedtls_ecp_check_privkey error\n");
        return -1;
    }

	 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
                    MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
    {
        ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
        goto cleanup;
    }

    if( p + len != end )
    {
        ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA +
              MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
        goto cleanup;
    }

    if( ( ret = mbedtls_asn1_get_mpi( &p, end, &r ) ) != 0 ||
        ( ret = mbedtls_asn1_get_mpi( &p, end, &s ) ) != 0 )
    {
        ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
        goto cleanup;
    }

	if( ( ret = mbedtls_ecdsa_verify( &grp, hash, hash_len, &pub_key, &r, &s ) ) != 0 )
        goto cleanup;

    if( p != end )
        ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;

cleanup:
	mbedtls_mpi_free(&r);
    mbedtls_mpi_free(&s);
	mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &pub_key);
	return ret;
}

int rk_ecdsa_sign2(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
						unsigned char *r_data, unsigned int *r_len, unsigned char *s_data, unsigned int *s_len)
{
    int ret = -1;
	mbedtls_ecp_group grp;
	mbedtls_mpi r, s;
    mbedtls_mpi pri_key;

	mbedtls_ecp_group_init( &grp );
    mbedtls_mpi_init( &pri_key);
	mbedtls_mpi_init(&r);
    mbedtls_mpi_init(&s);

	MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pri_key, key->d, key->d_len) );

    if(mbedtls_ecp_check_privkey( &grp, &pri_key) != 0)
    {
    	printf("mbedtls_ecp_check_privkey error\n");
        return -1;
    }

	MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(&grp, &r, &s, &pri_key, hash, hash_len, rnd_std_rand, NULL));

	*r_len = mbedtls_mpi_size(&r);
	mbedtls_mpi_write_binary(&r, r_data, *r_len);

	*s_len = mbedtls_mpi_size(&s);
	mbedtls_mpi_write_binary(&s, s_data, *s_len);
cleanup:
	mbedtls_mpi_free(&r);
    mbedtls_mpi_free(&s);
	mbedtls_ecp_group_free( &grp );
    mbedtls_mpi_free( &pri_key);
	return ret;
}

int rk_ecdsa_verify2(const mbed_ecc_key_t *key, unsigned char *hash, unsigned int hash_len,
						unsigned char *r_data, unsigned int r_len, unsigned char *s_data, unsigned int s_len)
{
    int ret = -1;
	mbedtls_ecp_group grp;
	mbedtls_mpi r, s;
    mbedtls_ecp_point pub_key;

	mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &pub_key);
	mbedtls_mpi_init(&r);
    mbedtls_mpi_init(&s);

	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r, r_data, r_len) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &s, s_data, s_len) );

	MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, key->curve ) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.X, key->x, key->x_len) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &pub_key.Y, key->y, key->y_len) );
	MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pub_key.Z, 1 ));

    if(mbedtls_ecp_check_pubkey( &grp, &pub_key) != 0)
    {
    	printf("mbedtls_ecp_check_privkey error\n");
        return -1;
    }

	if( ( ret = mbedtls_ecdsa_verify( &grp, hash, hash_len, &pub_key, &r, &s ) ) != 0 )
        goto cleanup;


cleanup:
	mbedtls_mpi_free(&r);
    mbedtls_mpi_free(&s);
	mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &pub_key);
	return ret;
}


#endif /* MBEDTLS_ECDSA_C */