从C＃到php的加密和解密

Question

我正在尝试将此加密和解密功能从C＃转换为php

public static string EncryptBySymmetricKey(string text, string sek) {
    //Encrypting SEK
    try {
        byte[] dataToEncrypt = Convert.FromBase64String(text);
        var keyBytes = Convert.FromBase64String(sek);
        AesManaged tdes = new AesManaged();
        tdes.KeySize = 256;
        tdes.BlockSize = 128;
        tdes.Key = keyBytes;
        tdes.Mode = CipherMode.ECB;
        tdes.Padding = PaddingMode.PKCS7;
        ICryptoTransform encrypt__1 = tdes.CreateEncryptor();
        byte[] deCipher = encrypt__1.TransformFinalBlock(dataToEncrypt, 0, dataToEncrypt.Length);
        tdes.Clear();
        string EK_result = Convert.ToBase64String(deCipher);
        return EK_result;

    }
    catch(Exception ex) {
        throw ex;
    }
}

public static byte[] DecryptBySymmetricKey(string encryptedText, byte[] key) {
    //Decrypting SEK
    try {
        byte[] dataToDecrypt = Convert.FromBase64String(encryptedText);
        var keyBytes = key;
        AesManaged tdes = new AesManaged();
        tdes.KeySize = 256;
        tdes.BlockSize = 128;
        tdes.Key = keyBytes;
        tdes.Mode = CipherMode.ECB;
        tdes.Padding = PaddingMode.PKCS7;
        ICryptoTransform decrypt__1 = tdes.CreateDecryptor();
        byte[] deCipher = decrypt__1.TransformFinalBlock(dataToDecrypt, 0, dataToDecrypt.Length);
        tdes.Clear();

        string EK_result = Convert.ToBase64String(deCipher);
        return EK_result;
    }
    catch(Exception ex) {
        throw ex;
    }
}

任何人都可以帮助我，上述C＃函数的正确php代码是什么。 在这里，我只想要php中相同的C＃代码。

预先感谢