Java字串不等于字串？

我想要decrypt一個String. 這里是我的Decryption和Encryption方法。

public String encrypt(String message) throws Exception {
    byte[] messageInBytes = message.getBytes();
    encryptionCipher = Cipher.getInstance("AES/GCM/NoPadding");
    encryptionCipher.init(Cipher.ENCRYPT_MODE, key);
    byte[] encryptedBytes = encryptionCipher.doFinal(messageInBytes);
    return encode(encryptedBytes);
}

public String decrypt(String encryptedMessage) throws Exception {
    byte[] messageInBytes = decode(encryptedMessage);
    Cipher decryptionCipher = Cipher.getInstance("AES/GCM/NoPadding");
    GCMParameterSpec spec = new GCMParameterSpec(T_LEN , encryptionCipher.getIV());
    decryptionCipher.init(Cipher.DECRYPT_MODE, key, spec);
    byte[] decryptedBytes = decryptionCipher.doFinal(messageInBytes);
    return new String(decryptedBytes);
}

這里主要：

public static void main(String[] args) {
    try {
        AES aes = new AES();
        aes.convertStringKeyToSecretKey();
        String encryptedMessage = aes.encrypt("Peter");
        String decryptedMessage = aes.decrypt(encryptedMessage);

        System.err.println("Encrypted Message : "   encryptedMessage);
        System.err.println("Decrypted Message : "   decryptedMessage);
    } catch (Exception ignored) {
    }
}

當我更改encryptedMessage為自己的時String：

String decryptedMessage = aes.decrypt("xDFzl9HsenqKspdEbL/m9I5X6dqn");

它什么都不做

我希望你能幫助我。

最好的祝福

基督教

uj5u.com熱心網友回復：

public static String encryptAES(String toEncrypt, final String key1, final String key2) throws Exception {
            try {
                byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
                IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);

                SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
                KeySpec keySpec = new PBEKeySpec(key1.toCharArray(), key2.getBytes(), 65536, 256);
                SecretKey secretKey = secretKeyFactory.generateSecret(keySpec);
                SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getEncoded(), "AES");
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);

                return Base64.getEncoder().encodeToString(cipher.doFinal(toEncrypt.getBytes(StandardCharsets.UTF_8)));
            } catch (Exception ex) {
                throw new Exception(ex);
            }
        }

        public static String decryptAES(String toDecrypt, final String key1, final String key2) throws Exception {
            try {
                byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
                IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);

                SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
                KeySpec keySpec = new PBEKeySpec(key1.toCharArray(), key2.getBytes(), 65536, 256);
                SecretKey secretKey = secretKeyFactory.generateSecret(keySpec);
                SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getEncoded(), "AES");
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);

                return new String(cipher.doFinal(Base64.getDecoder().decode(toDecrypt)));
            } catch (Exception ex) {
                throw new Exception(ex);
            }
        }

在這里，您仍然可以通過創建自己的 IV Spec 密鑰來擴展其安全性，該密鑰應僅包含 16 個字符。

實際上，這就是 AES 加密對我的作業方式，您還可以在GitHub 中查看此存盤庫以獲取其他加密方法。

標籤：爪哇 细绳 密码学 原子能级数

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