PHP对接银行JAVA 私钥解密出现乱码

获取私钥 .pfx文件
openssl_pkcs12_read(file_get_contents($filePath), $certs, '隐藏');
$privateKey = openssl_get_privatekey($certs['pkey']);
私钥解密
$res = openssl_private_decrypt($encryptedkeys,$crypted, $privateKey);
var_dump($res); bool(true)

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JAVA返回的字符串mtaRSKCLzy5pqRQxV7CREfCfppJfolQjM/qFC5qVHrdOsKYg+G5p7Qef9JVUvzYx4WRWodQUVTI7yIVvVT5GOji7aO3cO+DJbmPjNa/kLn932m8FSubT16aRTp7yOOacf36cWQdCQn5UmS6AfU5w1N532N3P2Lw38pwS673De/m0C4046ub+Ssx/yD9IMyfohEIR9I+/0YeU/K4M1Vk3KqxQdVIXjrVbVq9bx9pDxhVq8kKDtur5UyFQllmTmJYQfWwQxZ0oxPGoCgFzPfnC2XpYu9SJonxC49MJv6wx8w2M4aqRAUWbPqxf/GDQOVOGHuZ6ojqsluqBqPgGVWlAzA==