ECDSA-php 加密解密

<?php  

class Ecdsa
{
    private $alg;

    public function __construct() {
        $this->alg = OPENSSL_ALGO_SHA256;
    }

    /**
     * 加密
     * @param privateKeyString  私钥
     * @param message  请求数据（数组）
     */
    public function php_encry($privateKeyString = '', $message = []) {
        $privateKey = openssl_get_privatekey($privateKeyString);

        $message = json_encode($message, JSON_PRETTY_PRINT);

        $signature = null;
        if (openssl_sign($message, $signature, $privateKey, $this->alg)) {
            $signature = base64_encode($signature);
            return $signature;
        } else {
            return openssl_error_string();
        }
    }

    /**
     * 验签
     * @param publicKeyString  公钥
     * @param message  请求json串
     * @param signature  base64加密后的字符串
     */
    public function php_decry($publicKeyString = '', $message = [], $signature = '') {
        $publicKey = openssl_get_publickey($publicKeyString);

        $message = json_encode($message, JSON_PRETTY_PRINT);

        $return = [
            'code' => 0,
            'message' => 'error'
        ];

        //验证签名
        $success = openssl_verify($message, base64_decode($signature), $publicKey, $this->alg);
        if ($success === -1) {
            $return['message'] = openssl_error_string();
            return $return;
        } elseif ($success === 1) {
            $return['code'] = 1;
            $return['message'] = 'success';
            return $return;
        } else {
            $return['message'] = openssl_error_string();
            return $return;
        }
    }
}

//var_dump(openssl_get_md_methods());die;

$ec = new Ecdsa();

$private_key = 'MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQglCkOi90fqXJ3u1J0l1RwP0FTfv08
    LYzSwj+B0vAJq3ehRANCAARu/5R3QWhJ6EBK/UTL7Zg/IP4ixFFZAcMMNnRdwKSopGhwxhksw93F
    ZeH5f7RUSL8m5rNLrKyIm/AhpOFd2LJe';

$privateKeyString =
"-----BEGIN EC PARAMETERS-----
BgUrgQQACg==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
".$private_key."
-----END EC PRIVATE KEY-----";

$public_key = 'MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEbv+Ud0FoSehASv1Ey+2YPyD+IsRRWQHDDDZ0XcCkqKRocMYZLMPdxWXh+X+0VEi/JuazS6ysiJvwIaThXdiyXg==';
$publicKeyString =
"-----BEGIN PUBLIC KEY-----
".$public_key."
-----END PUBLIC KEY-----";

$message = '欧阳草帽';

$sign = $ec->php_encry($privateKeyString, $message);
echo $sign.'<br>';
$res = $ec->php_decry($publicKeyString, $message, $sign);
echo $res['message'];