![](/img/trans.png)
[英]Padding error when using RSA Encryption in C# and Decryption in Java
[英]Padding is invalid and cannot be removed - decryption in c# (encryption done in java)
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, skeySpec, 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#,在 java 中完成加密,现在我正在尝试解密 c# 中的数据。 我读到 PaddingMode.PKCS7 和 PKCS5 都是一样的。 这是真的吗? 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。 我错过了什么吗?
我对 Convert.FromBase64String(encryptedText) 有疑问,因为这是他们 (java) 使用 value.getBytes() 的地方。 c# 中的 getBytes() 等价物是 Convert.FromBase64String()? 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。 如何将它们作为字节 [] 进行比较?
如果我将 Convert.FromBase64String() 更改为 Encoding.UTF8.GetBytes() 那么它会抛出“要解密的数据长度无效 AES C#”错误。
这是我的密文wJZESOEPNb66FbnpB8DqmwLcyosxGOjzgPKa9 + 7 / VUatEFxSs1YqS28HHU26EmCcZDo7otE5PvX / qIpgQgTrhlCHgUJBb0 + qd522 / 1egYoisE48ZL8X3cwCNx1AOVYJ0T2VOLB + J3HDWK4HOJfgm2CqbQpep0ioOTgNKQA0SF3SRmF92MGbf7wjUBA8WGdeUiIKRX9Lm / x6mUUuXHEIrCHbZOqDZvo2xR9zndIzwT / FfgLsQbJQjRjZPg7urfWLpUt6drbYcPFm3KgTmSrsRhzk15P6mw3GNO + 3BmqBIndKmzi8blQqG8YFXVW8wiaurCm0jVcX5kwdU1PO1ktHSXQ ==
用于加密 BFEBFBFF000306D4 的密钥
我对 c# aes 和 hashKey 使用了我自己的解密方法,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
使用这个字符串和给定的 string_key 到 C# 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,使完整的加密不安全。 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, 0, sha1HashLength, 0, 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;
}
}
编辑 1:在我的 Java 代码中,我更改了以下行:
//String string_key = "mySecretKey";
String string_key = "BFEBFBFF000306D4";
结果如下:
encryptedLicense: 7QWzpg/rVE6AhmcGphFT9uswU8hgKjG3i9NHJHCn/fKITYNIljOb28+cbh5y5JEA
更改我的 C# 代码如下:
//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
所以一切正常。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.