AES-Java加密与PHP解密

Question

为什么PHP解密方法不能解密用Java加密的数据？

当我仅使用Java或仅在PHP中加密和解密数据时，一切工作都很好。

package com.example.test.helpers;
import android.util.Base64;
import java.nio.charset.StandardCharsets;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class Encryptor {

    /**
    * @param strToEncrypt - data to encrypt
    * @param secret - 16 bytes secret
    */
    public static String encrypt(String strToEncrypt, String secret) // secret is always 2a925de8ca0248d7
    {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding");
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(secret.getBytes(), "AES"));
            return Base64.encodeToString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)), Base64.DEFAULT);
        }
        catch (Exception e)
        {
            System.out.println("Error while encrypting: " + e.toString());
        }
        return null;
    }

     /**
     * @param strToDecrypt - base64 encoded string to decrypt
     * @param secret - 16 bytes secret
     */
     public static String decrypt(String strToDecrypt, String secret) // secret is always 2a925de8ca0248d7
     {
         try {
             Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(secret.getBytes(), "AES"));
             return new String(cipher.doFinal(Base64.decode(strToDecrypt, Base64.DEFAULT)));
        }
        catch (Exception e) {
            System.out.println("Error while decrypting: " + e.toString());
        }
        return null;
    }
}

加密的数据被发送到服务器，在那里我尝试用PHP openssl_decrypt对其进行解密

openssl_decrypt($receivedEncryptedBase64Data, 'AES-256-ECB', '2a925de8ca0248d7');

不幸的是，openssl_decrypt返回一个空字符串。

Answer 1

好了，现在我明白了。我应该在AES-256-ECB的PHP insetad中使用AES-128-ECB或将密钥扩展到256字节。