java - 如何在这里解密消息加密？

Question

try{
    String plainData="my name is laksahan",cipherText,decryptedText;
    KeyGenerator keyGen = KeyGenerator.getInstance("AES");
    keyGen.init(128);
    SecretKey secretKey = keyGen.generateKey();
    Cipher aesCipher = Cipher.getInstance("AES");
    aesCipher.init(Cipher.ENCRYPT_MODE,secretKey);
    byte[] byteDataToEncrypt = plainData.getBytes();
    byte[] byteCipherText = aesCipher.doFinal(byteDataToEncrypt);
    cipherText = new BASE64Encoder().encode(byteCipherText);
System.out.println(cipherText);
}catch(Exception e){

}

我也有解密代码，但我想使用 cipherText 的输出解密消息。

例如; 我的密文输出是uSG1OxJPywzU4JylpqgS6SoB9t21GZ4iN3bY2M6Qf10=.

我想解密这个：uSG1OxJPywzU4JylpqgS6SoB9t21GZ4iN3bY2M6Qf10=

提前致谢。

Answer 1

试试这个代码，它在我的电脑上运行良好。祝你好运！

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;

public class AESExample
{
    public static void main(String[] args)
    {
        try
        {
            String plainData = "my name is laksahan", cipherText, decryptedText;
            KeyGenerator keyGen = KeyGenerator.getInstance("AES");
            keyGen.init(128);
            SecretKey secretKey = keyGen.generateKey();
            cipherText = encrypt(plainData, secretKey);
            System.out.println(cipherText);
            decryptedText = decrypt(cipherText, secretKey);
            System.out.println(decryptedText);
        } catch (Exception e)
        {
            e.printStackTrace();
        }

    }

    public static String encrypt(String plainData, SecretKey secretKey) throws Exception
    {
        Cipher aesCipher = Cipher.getInstance("AES");
        aesCipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] byteDataToEncrypt = plainData.getBytes();
        byte[] byteCipherText = aesCipher.doFinal(byteDataToEncrypt);
        return new BASE64Encoder().encode(byteCipherText);
    }

    public static String decrypt(String cipherData, SecretKey secretKey) throws Exception
    {
        byte[] data = new BASE64Decoder().decodeBuffer(cipherData);
        Cipher aesCipher = Cipher.getInstance("AES");
        aesCipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] plainData = aesCipher.doFinal(data);
        return new String(plainData);
    }

}

---

如果您想使用客户密钥，请尝试以下代码，只需记住密钥长度为 128 位。顺便说一句，我更喜欢将我的密钥存储在密钥库文件中！

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;

public class AESExample
{

    public static void main(String[] args)
    {
        try
        {
            byte[]key={-4, -14, 106, -75, -9, 65, -95, 77, -52, 73, -87, -101, 80, 94, -59, -66};
            String plainData = "my name is laksahan", cipherText, decryptedText;
            System.out.println(key.length);
            cipherText = encrypt(plainData, key);
            System.out.println(cipherText);
            decryptedText = decrypt(cipherText, key);
            System.out.println(decryptedText);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public static String encrypt(String plainData, byte[] key) throws Exception
    {
        Cipher aesCipher = Cipher.getInstance("AES");
        SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
        aesCipher.init(Cipher.ENCRYPT_MODE, keySpec);
        byte[] byteDataToEncrypt = plainData.getBytes();
        byte[] byteCipherText = aesCipher.doFinal(byteDataToEncrypt);
        return new BASE64Encoder().encode(byteCipherText);
    }

    public static String decrypt(String cipherData, byte[] key) throws Exception
    {
        byte[] data = new BASE64Decoder().decodeBuffer(cipherData);
        SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
        Cipher aesCipher = Cipher.getInstance("AES");
        aesCipher.init(Cipher.DECRYPT_MODE, keySpec);
        byte[] plainData = aesCipher.doFinal(data);
        return new String(plainData);
    }

}

Answer 2

尝试这个

 byte[] data = new BASE64Decoder().decodeBuffer(cipherData);
        Cipher aesCipher = Cipher.getInstance("AES");
        aesCipher.init(Cipher.DECRYPT_MODE, secretKeyUsed while encrypting);
        byte[] plainData = aesCipher.doFinal(data);
        return new String(plainData);