问题描述
Java code
public String encrypt(String key,String value) {
try {
String initVector = "RgUkXp2s5v8y/B?E";
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
SecretKeySpec skeySpec = new SecretKeySpec(hashKey(key),"AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(1,skeySpec,iv);
byte[] encrypted = cipher.doFinal(value.getBytes());
return Base64.getEncoder().encodetoString(encrypted);
} catch (Exception ex) {
ex.printstacktrace();
return null;
}
}
private byte[] hashKey(String keyvalue) throws NoSuchAlgorithmException,UnsupportedEncodingException {
byte[] key = keyvalue.getBytes("UTF-8");
MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
key = messageDigest.digest(key);
return Arrays.copyOf(key,16);
}
public static String decrypt(byte[] key,String encrypted)
{
try
{
String initVector = "RgUkXp2s5v8y/B?E";
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
SecretKeySpec skeySpec = new SecretKeySpec(key,"AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(2,iv);
byte[] original = cipher.doFinal(Base64.getDecoder().decode(encrypted));
return new String(original);
}
catch (Exception ex)
{
Logger.getLogger("Decryption ").log(Level.SEVERE,"Exception processing decryption " + ex.getMessage());
return null;
}
}
String encryptedLicense = ENCRYPT.encrypt(string_key,stringToEncrypt);
converted c# code
public static byte[] getDefaultKey()
{
return DecryptUtil.hashKey(DecryptUtil.getUniqueIdentifier());
}
private static byte[] hashKey(string keyvalue)
{
try
{
var sha1 = SHA1Managed.Create();
byte[] inputBytes = Encoding.UTF8.GetBytes(keyvalue);
byte[] outputBytes = sha1.ComputeHash(inputBytes);
return outputBytes;
}
catch (Exception ex)
{
ErrorLogger.WritetoFile("hashKey " + ex.Message.ToString());
}
return null;
}
public static string Decrypt_License(string encryptedText,byte[] key)
{
string initVector = "RgUkXp2s5v8y/B?E";
var ivBytes = Encoding.UTF8.GetBytes(initVector);
var keyBytes = new byte[16];
Array.copy(key,keyBytes,Math.Min(keyBytes.Length,key.Length));
string plaintext = null;
// Create AesManaged
using (AesManaged aes = new AesManaged())
{
aes.Padding = PaddingMode.PKCS7;
aes.Key = keyBytes;
aes.IV = ivBytes;
aes.BlockSize = 128;
aes.KeySize = 128;
aes.Mode = CipherMode.CBC;
ICryptoTransform decryptor = aes.CreateDecryptor(keyBytes,ivBytes);
using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(encryptedText)))
{
using (CryptoStream cs = new CryptoStream(ms,decryptor,CryptoStreamMode.Read))
{
using (StreamReader reader = new StreamReader(cs))
plaintext = reader.ReadToEnd();
}
}
}
return plaintext;
}
String decryptedString = DecryptUtil.Decrypt_License(hashkey(string_key),stringToDecrypt);
我正在将Java代码转换为c＃，现在已经在java中完成了加密，我正在尝试解密c＃中的数据。我读了PaddingMode.PKCS7和PKCS5都是一样的。是真的吗还是应该更改填充类型？
我已经使用了Java中使用的所有概念。但它不起作用。我想念什么吗？
我对Convert.FromBase64String（encryptedText）表示怀疑，因为这是他们（java）使用value.getBytes（）的地方。在C＃中等效的getBytes（）是Convert.FromBase64String（）吗？他们会产生相同的结果吗？
Java hashkey（）方法和C＃hashkey方法给出不同的结果。如何将它们比较为byte []？
如果我将Convert.FromBase64String（）更改为Encoding.UTF8.GetBytes（），则会抛出“要解密的数据长度是无效的AES C＃”错误。
这是我的加密文本 wJZESOEPNb66FbnpB8DqmwLcyosxGOjzgPKa9 + 7 / VUatEFxSs1YqS28HHU26EmCcZDo7otE5PvX / qIpgQgTrhlCHgUJBb0 + qd522 / 1egYoisE48ZL8X3cwCNx1AOVYJ0T2VOLB + J3HDWK4HOJfgm2CqbQpep0ioOTgNKQA0SF3SRmF92MGbf7wjUBA8WGdeUiIKRX9Lm / x6mUUuXHEIrCHbZOqDZvo2xR9zndIzwT / FfgLsQbJQjRjZPg7urfWLpUt6drbYcPFm3KgTmSrsRhzk15P6mw3GNO + 3BmqBIndKmzi8blQqG8YFXVW8wiaurCm0jVcX5kwdU1PO1ktHSXQ ==
用于加密的秘密密钥 BFEBFBFF000306D4
解决方法
我对c＃aes和hashKey使用了自己的解密方法，并且我知道它们正在工作：-）。
将这些数据作为Java加密的输入：
String string_key = "mySecretKey";
String stringToEncrypt = "The quick brown fox jumps over the lazy dog";
我得到了
encryptedLicense: lrgzfdMTetZKeAFlCAbCDBL4VhtpVGdhTESl9QNgs5b0KOWke1CnKQQf+xmB+/mK
使用此字符串和给C＃的给定string_key进行输出：
plaintext expect : The quick brown fox jumps over the lazy dog
plaintext from C#: The quick brown fox jumps over the lazy dog
安全警告：此代码使用固定的加密密钥和固定的初始化向量，从而使 完全加密不安全。该代码没有适当的异常处理，仅用于教育目的。
C＃代码：
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
public class Program {
public static void Main() {
Console.WriteLine("Padding is invalid and cannot be removed - decryption in c# (encryption done in java)");
string plaintextExpected = "The quick brown fox jumps over the lazy dog";
string encryptedLicense = "lrgzfdMTetZKeAFlCAbCDBL4VhtpVGdhTESl9QNgs5b0KOWke1CnKQQf+xmB+/mK";
string string_key = "mySecretKey";
string plaintext = "";
// decryption
plaintext = decryptFromBase64(hashKey(string_key),encryptedLicense);
Console.WriteLine("plaintext expect : " + plaintextExpected);
Console.WriteLine("plaintext from C#: " + plaintext);
}
public static byte[] hashKey(string value)
{
byte[] bytes = System.Text.Encoding.UTF8.GetBytes(value);
SHA1 sha = new SHA1CryptoServiceProvider();
byte[] sha1Hash = sha.ComputeHash(bytes);
byte[] sha1HashLength = new byte[16];
Array.Copy(sha1Hash,sha1HashLength,16);
return sha1HashLength;
}
static string decryptFromBase64(byte[] key,string data) {
string decryptedtext;
using(Aes aesAlg = Aes.Create()) {
aesAlg.Key = key;
string initVector = "RgUkXp2s5v8y/B?E";
byte[] IV = Encoding.UTF8.GetBytes(initVector);
byte[] cipherText = Convert.FromBase64String(data);
aesAlg.IV = IV;
aesAlg.Mode = CipherMode.CBC;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key,aesAlg.IV);
using(var msDecrypt = new MemoryStream(cipherText)) {
using(var csDecrypt = new CryptoStream(msDecrypt,decryptor,CryptoStreamMode.Read)) {
using(var srDecrypt = new StreamReader(csDecrypt)) {
decryptedtext = srDecrypt.ReadToEnd();
}
}
}
}
return decryptedtext;
}
}
修改1： 在我的Java代码中，我更改了以下行：
//String string_key = "mySecretKey";
String string_key = "BFEBFBFF000306D4";
得到结果：
encryptedLicense: 7QWzpg/rVE6AhmcGphFT9uswU8hgKjG3i9NHJHCn/fKITYNIljOb28+cbh5y5JEA
按如下所示更改我的C＃代码：
//string encryptedLicense = "lrgzfdMTetZKeAFlCAbCDBL4VhtpVGdhTESl9QNgs5b0KOWke1CnKQQf+xmB+/mK";
string encryptedLicense = "7QWzpg/rVE6AhmcGphFT9uswU8hgKjG3i9NHJHCn/fKITYNIljOb28+cbh5y5JEA";
//string string_key = "mySecretKey";
string string_key = "BFEBFBFF000306D4";
得到结果：
plaintext expect : The quick brown fox jumps over the lazy dog
plaintext from C#: The quick brown fox jumps over the lazy dog
一切正常。