考慮到 Golang 加密，如何在 Java 和 Scala 中解密 AES 加密文字？

Golang 中的AES 加密及其Java 中的解密

問題中提供的AES 的Golang 加密函數使用高級加密標準字串（AES）演算法對加密，以Base64 編碼產生密文。為了用Java解密這個密文，我們需要一個適當的解密函數。

Java解密函數

<code class="java">import java.util.Base64;
import javax.crypto.*;
import javax.crypto.spec.*;

public class AESDecryption {

    public static String decode(String base64Text, byte[] key)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        byte[] inputArr = Base64.getUrlDecoder().decode(base64Text);
        SecretKeySpec skSpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CFB/NoPadding");
        int blockSize = cipher.getBlockSize();
        IvParameterSpec iv = new IvParameterSpec(Arrays.copyOf(inputArr, blockSize));
        byte[] dataToDecrypt = Arrays.copyOfRange(inputArr, blockSize, inputArr.length);
        cipher.init(Cipher.DECRYPT_MODE, skSpec, iv);
        byte[] result = cipher.doFinal(dataToDecrypt);
        return new String(result, StandardCharsets.UTF_8);
    }

    public static void main(String[] args) {
        // Encryption result from the Go function.
        String base64Text = "c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0=";
        // The encryption key (same as in Go).
        byte[] key = "0123456789abcdef".getBytes();

        try {
            // Decrypt the ciphertext.
            String decrypted = decode(base64Text, key);
            // Print the decrypted text.
            System.out.println(decrypted);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}</code>

Scala解密函數

<code class="scala">import java.nio.charset.StandardCharsets
import javax.crypto._
import javax.crypto.spec.{IvParameterSpec, SecretKeySpec}
import java.util.Base64

object AESDecryption {

  def decode(input: String, key: String): String = {
    val cipher = Cipher.getInstance("AES/CFB/NoPadding")
    val blockSize = cipher.getBlockSize
    val keyBytes = key.getBytes
    val inputArr = Base64.getUrlDecoder.decode(input)
    val skSpec = new SecretKeySpec(keyBytes, "AES")
    val iv = new IvParameterSpec(inputArr.slice(0, blockSize).toArray)
    val dataToDecrypt = inputArr.slice(blockSize, inputArr.size)
    cipher.init(Cipher.DECRYPT_MODE, skSpec, iv)
    new String(cipher.doFinal(dataToDecrypt.toArray), StandardCharsets.UTF_8)
  }

  def main(args: Array[String]): Unit = {
    // Encryption result from the Go function.
    val base64Text = "c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0="
    // The encryption key (same as in Go).
    val key = "0123456789abcdef"

    // Decrypt the ciphertext.
    val decrypted = decode(base64Text, key)
    // Print the decrypted text.
    println(decrypted)
  }
}</code>

Java和Scala解密函數以密文和密鑰作為輸入，使用AES/CFB/NoPadding演算法解密密文，並將解密後的明文作為字串傳回。

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