从android加密并在CryptoJS中解密

问题描述

我对AES加密和解密非常陌生。在我的应用程序中，我必须解密从服务器获取的数据。我收到的数据使用CryptoJS库加密。解密工作得很好。但是，在将数据发布到服务器时，我必须再次对数据进行加密并将其发送到服务器，这没有进行适当的加密。我已经按照进行了解密，效果很好。我将在下面发布我的解密代码。请帮忙。

I am very much new to AES encryption and decryption. In my app, I have to decrypt the data which I get from server. The data I recieve is encrypted using CryptoJS library. The decryption works pretty much fine. But while posting the data to server, I have to again encrypt the data and send it to server, which is not giving proper encryption. I have followed This Stack overflow answer for decryption which is working fine.I will post my decryption code below. Please help.

解密：

 public  static String Decrypt(String Encrpyt , String Key ) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    byte[] cipherData = Base64.decode(Encrpyt, Base64.DEFAULT);
    byte[] saltData = Arrays.copyOfRange(cipherData, 8, 16);

    MessageDigest md5 = null;
    try {
        md5 = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    final byte[][] keyAndIV = GenerateKeyAndIV(32, 16, 1, saltData, Key.getBytes(StandardCharsets.UTF_8), md5);
    SecretKeySpec key = new SecretKeySpec(keyAndIV[0], "AES");
    IvParameterSpec iv = new IvParameterSpec(keyAndIV[1]);

    byte[] encrypted = Arrays.copyOfRange(cipherData, 16, cipherData.length);
    Cipher aesCBC = Cipher.getInstance("AES/CBC/PKCS5Padding");

    aesCBC.init(Cipher.DECRYPT_MODE, key, iv);
    byte[] decryptedData = aesCBC.doFinal(encrypted);
    String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

    System.out.println(decryptedText);
    return decryptedText;
}

public static byte[][] GenerateKeyAndIV(int keyLength, int ivLength, int iterations, byte[] salt, byte[] password, MessageDigest md) {

    int digestLength = md.getDigestLength();
    int requiredLength = (keyLength + ivLength + digestLength - 1) / digestLength * digestLength;
    byte[] generatedData = new byte[requiredLength];
    int generatedLength = 0;

    try {
        md.reset();

        // Repeat process until sufficient data has been generated
        while (generatedLength < keyLength + ivLength) {

            // Digest data (last digest if available, password data, salt if available)
            if (generatedLength > 0)
                md.update(generatedData, generatedLength - digestLength, digestLength);
            md.update(password);
            if (salt != null)
                md.update(salt, 0, 8);
            try {
                md.digest(generatedData, generatedLength, digestLength);
            } catch (DigestException e) {
                e.printStackTrace();
            }

            // additional rounds
            for (int i = 1; i < iterations; i++) {
                md.update(generatedData, generatedLength, digestLength);
                md.digest(generatedData, generatedLength, digestLength);
            }

            generatedLength += digestLength;
        }

        // Copy key and IV into separate byte arrays
        byte[][] result = new byte[2][];
        result[0] = Arrays.copyOfRange(generatedData, 0, keyLength);
        if (ivLength > 0)
            result[1] = Arrays.copyOfRange(generatedData, keyLength, keyLength + ivLength);

        return result;

    } catch (DigestException e) {
        throw new RuntimeException(e);

    } finally {
        // Clean out temporary data
        Arrays.fill(generatedData, (byte)0);
    }
}

推荐答案

此库可以在所有平台上正常工作。

This library working fine for all platforms.

用于Android加密

For android encryption

步骤1：使用此实用程序类->

步骤2：加密&

try {
String plainText = "this is my plain text";
String key = "simplekey";
String iv = "1234123412341234";

CryptLib cryptLib = new CryptLib();

String encryptedString = cryptLib.encryptSimple(plainText, key, iv);
System.out.println("encryptedString " + encryptedString);

String decryptedString = cryptLib.decryptSimple(encryptedString, key, iv);
System.out.println("decryptedString " + decryptedString);
} catch (Exception e) {
e.printStackTrace();
}

Java脚本代码

Java Script code

var plainText = "this is my plain text";
var key = "simplekey";
var iv = "1234123412341234";

var cryptoLib = require('cryptlib');

shaKey = cryptoLib.getHashSha256(key, 32); // This line is not needed on Android or iOS. Its already built into CryptLib.m and CryptLib.java

var encryptedString = cryptoLib.encrypt(plainText, shaKey, iv);
console.log('encryptedString %s', encryptedString);

var decryptedString = cryptoLib.decrypt(encryptedString, shaKey, iv);
console.log('decryptedString %s', decryptedString);

对于iOS用户，请使用此示例

For iOS users use this sample

所有平台都会产生相同的以下输出

All platforms produce same following output

解密的字符串： >这是我的纯文本

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