ECDSA_do_verify error?

[shixin]

 Hi, all:
        I want to verify signature that the data are from NIST test vectors. 
But the result awalys error!
        The source is as follow:
 #include <stdio.h>
#include <string.h>
#include <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/obj_mac.h>
#include <openssl/bn.h>

#pragma comment(lib, "libeay32.lib")
#pragma comment(lib, "ssleay32.lib")

int main(void)
{
    int status = 0;
    unsigned int digest_len = 0;
    unsigned char digest[32] = {0};
    char *message = "This is only a test message. It is 48 bytes long";

    EVP_MD_CTX md_ctx;
    EC_KEY *pEccKey = NULL;
    EC_GROUP *pEccGroup = NULL;
    ECDSA_SIG *signature = NULL;
    EC_POINT *pub_key = NULL;
    BIGNUM *bn_priv_key = NULL;
    BIGNUM *bn_x_key = NULL;
    BIGNUM *bn_y_key = NULL;
    BN_CTX *bn_ctx = NULL;

    char *pub_key_x = NULL;
    char *pub_key_y = NULL;
    char *priv_key_ = NULL;
    int pub_key_x_len = 0;
    int pub_key_y_len = 0;
    int priv_key_len = 0;

    unsigned char msg[] = 
{"\x60\xcd\x64\xb2\xcd\x2b\xe6\xc3\x38\x59\xb9\x48\x75\x12\x03\x61\xa2\x40\x85\xf3\x76\x5c\xb8\xb2\xbf\x11\xe0\x26\xfa\x9d\x88\x55\xdb\xe4\x35\xac\xf7\x88\x2e\x84\xf3\xc7\x85\x7f\x96\xe2\xba\xab\x4d\x9a\xfe\x45\x88\xe4\xa8\x2e\x17\xa7\x88\x27\xbf\xdb\x5d\xdb\xd1\xc2\x11\xfb\xc2\xe6\xd8\x84\xcd\xdd\x7c\xb9\xd9\x0d\x5b\xf4\xa7\x31\x1b\x83\xf3\x52\x50\x80\x33\x81\x2c\x77\x6a\x0e\x00\xc0\x03\xc7\xe0\xd6\x28\xe5\x07\x36\xc7\x51\x2d\xf0\xac\xfa\x9f\x23\x20\xbd\x10\x22\x29\xf4\x64\x95\xae\x6d\x08\x57\xcc\x45\x2a\x84"};
    unsigned char xx[] = 
{"\x2d\x98\xea\x01\xf7\x54\xd3\x4b\xbc\x30\x03\xdf\x50\x50\x20\x0a\xbf\x44\x5e\xc7\x28\x55\x6d\x7e\xd7\xd5\xc5\x4c\x55\x55\x2b\x6d"};
    unsigned char yy[] = 
{"\x9b\x52\x67\x27\x42\xd6\x37\xa3\x2a\xdd\x05\x6d\xfd\x6d\x87\x92\xf2\xa3\x3c\x2e\x69\xda\xfa\xbe\xa0\x9b\x96\x0b\xc6\x1e\x23\x0a"};
    unsigned char rr[] = 
{"\x06\x10\x8e\x52\x5f\x84\x5d\x01\x55\xbf\x60\x19\x32\x22\xb3\x21\x9c\x98\xe3\xd4\x94\x24\xc2\xfb\x2a\x09\x87\xf8\x25\xc1\x79\x59"};
    unsigned char ss[] = 
{"\x62\xb5\xcd\xd5\x91\xe5\xb5\x07\xe5\x60\x16\x7b\xa8\xf6\xf7\xcd\xa7\x46\x73\xeb\x31\x56\x80\xcb\x89\xcc\xbc\x4e\xec\x47\x7d\xce"};

    // openssl initialization
    ERR_load_crypto_strings();
    OpenSSL_add_all_algorithms();
   
    // hash message with sha256
    EVP_MD_CTX_init(&md_ctx);
    EVP_DigestInit(&md_ctx, EVP_sha256());
    EVP_DigestUpdate(&md_ctx, (const void *)msg, strlen(msg));
    EVP_DigestFinal(&md_ctx, digest, &digest_len);
    EVP_MD_CTX_cleanup(&md_ctx);

    pEccKey = EC_KEY_new();
    if (NULL == pEccKey) {
        printf("ECC_KEY_new, error: %s\n",
                ERR_error_string(ERR_get_error(), NULL));
        goto prog_end;
    }

    // output ECDSA key string
    pEccKey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
    if (NULL == pEccKey) {
        printf("EC_KEY_new_by_curve_name, error: %s\n",
                ERR_error_string(ERR_get_error(), NULL));
        goto prog_end;
    }

    bn_ctx = BN_CTX_new();
    bn_x_key = BN_new();
    bn_y_key = BN_new();
    pub_key = EC_POINT_new(EC_KEY_get0_group(pEccKey));
    signature = ECDSA_SIG_new();
    //
    bn_x_key = BN_bin2bn(xx, strlen(xx), bn_x_key);
    bn_y_key = BN_bin2bn(yy, strlen(yy), bn_y_key);
    EC_KEY_set_public_key_affine_coordinates(pEccKey, bn_x_key, bn_y_key);

    //
    signature->r = BN_bin2bn(rr, strlen(rr), signature->r);
    signature->s = BN_bin2bn(ss, strlen(ss), signature->s);

    /* check key */
    if (!EC_KEY_check_key(pEccKey)) {
        fprintf(stderr, "EC_KEY_check_key failed.\n");
    }

    // verify the signature
    status = ECDSA_do_verify(digest, digest_len, signature,pEccKey);
    if (status != 1) {
        printf("ECDSA_do_verify, error: %s\n",
                ERR_error_string(ERR_get_error(), NULL));
        goto prog_end;
    } else {
        printf("ECDSA verify successfully!\n");
    }


prog_end:

    // openssl cleanup
    if (pEccKey) EC_KEY_free(pEccKey);
    if (pEccGroup) EC_GROUP_free(pEccGroup);
    if (signature) ECDSA_SIG_free(signature);

    if (pub_key) EC_POINT_free(pub_key);
    if (bn_x_key) BN_free(bn_x_key);
    if (bn_y_key) BN_free(bn_y_key);

    if (pub_key_x)  OPENSSL_free(pub_key_x);
    if (pub_key_y) OPENSSL_free(pub_key_y);

    CRYPTO_cleanup_all_ex_data();
    ERR_free_strings();
    ERR_remove_state(0);

    return 0;
}

          But why? The Programdoes not seemwrong.
         Looking forward to yourreply~~~

Best Wishes!
ShiXin