

#include "internal/deprecated.h" 

#include <openssl/err.h>
#include "crypto/sm2err.h"
#include "crypto/sm2.h"
#include <openssl/ec.h> 



int ossl_sm2_key_private_check(const EC_KEY *eckey)
{
    int ret = 0;
    BIGNUM *max = NULL;
    const EC_GROUP *group = NULL;
    const BIGNUM *priv_key = NULL, *order = NULL;

    if (eckey == NULL
            || (group = EC_KEY_get0_group(eckey)) == NULL
            || (priv_key = EC_KEY_get0_private_key(eckey)) == NULL
            || (order = EC_GROUP_get0_order(group)) == NULL) {
        ERR_raise(ERR_LIB_SM2, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }

    
    max = BN_dup(order);
    if (max == NULL || !BN_sub_word(max, 1))
        goto end;
    if (BN_cmp(priv_key, BN_value_one()) < 0
        || BN_cmp(priv_key, max) >= 0) {
        ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_PRIVATE_KEY);
        goto end;
    }
    ret = 1;

 end:
    BN_free(max);
    return ret;
}
