Java AES 加密 - 幕后

Question

我有以下用于字符串加密和解密的JAVA代码:

public class AES {

    private SecretKeySpec setKey(String myKey)
    {
        try {
            byte[] key = myKey.getBytes("UTF-8");
            MessageDigest sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16);
            SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
            return secretKey;
        }
        catch (NoSuchAlgorithmException e) {
            return null;
        }
        catch (UnsupportedEncodingException e) {
            return null;
        }
    }

    synchronized public String encrypt(String strToEncrypt, String secret)
    {
        try
        {
            SecretKeySpec secretKey = setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
        }
        catch (Exception e)
        {
           return null;
        }
        return null;
    }

    synchronized public String decrypt(String strToDecrypt, String secret) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException
    {
            SecretKeySpec secretKey = setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
    }

例如，当我在字符串“test”和 key (“d%D*G-JaXdRgUkXs”)上使用我的类时，我得到:

D+BhlzXKsINiKja6ZsITWQ==

我尝试在在线工具(如https://8gwifi.org/CipherFunctions.jsp)中使用相同的 key 进行相同的加密(AES/ECB/PKCS5Padding) ,但我得到了不同的结果:

Nwha9Dgv9IaN4W39C6c0cQ==

我缺少什么？

Answer 1

试试这个。您使用 SHA-1 算法生成摘要，然后将其分配给 SecretKeySpec 以生成 secret key 。这将为您提供本网站给出的答案。

public class Main {


    public static void main(String[] args) {
        Main main = new Main();

        System.out.println(main.encrypt("test","d%D*G-JaXdRgUkXs"));

    }
    private SecretKeySpec setKey(String myKey)
    {
        try {
            byte[] key = myKey.getBytes("UTF-8");

            key = Arrays.copyOf(key, 16);
            SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
            return secretKey;
        }
        catch (UnsupportedEncodingException e) {
            return null;
        }
    }

    synchronized public String encrypt(String strToEncrypt, String secret)
    {
        try
        {
            SecretKeySpec secretKey = setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
        }
        catch (Exception e)
        {
            return null;
        }
    }

    synchronized public String decrypt(String strToDecrypt, String secret) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException
    {
        SecretKeySpec secretKey = setKey(secret);
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
    }
}

如果运行此代码，您将得到以下结果

Nwha9Dgv9IaN4W39C6c0cQ==