[英]Aes encrypt in Java and decrypt in C#
在 Java 代码中,我的源代码运行良好,这是用于加密:
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class HelloWorld{
private static final String hexKey = "B8EE12E123C0E300A202074A153CC0D27D739357480FFFFFFFFFFFFFFFFFFFEF";
public static void main(String []args){
System.out.println("Encryt ==== ");
String textToEncrypt = "From=ABC&Key=FootID1234&Value=ResultValue2324";
String encryptedText = encrypt(textToEncrypt);
System.out.println(encryptedText);
System.out.println("Decrypt ==== ");
String decryptedText = decrypt(encryptedText);
System.out.println(decryptedText);
}
public static String encrypt (String plainText) {
String encryptedText = null;
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
SecretKeySpec secretKey = new SecretKeySpec(hexToBytes(hexKey), "AES");
IvParameterSpec ivparameterspec = new IvParameterSpec(hexKey.getBytes(), 0, 16);
cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivparameterspec);
byte[] cipherText = cipher.doFinal(plainText.getBytes("UTF8"));
encryptedText = bytesToHex(cipherText);
} catch (Exception E) {
System.out.println("Encrypt Exception : " + E.getMessage());
}
return encryptedText;
}
public static String decrypt(String encryptedText) {
String decryptedText = null;
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
SecretKeySpec secretKey = new SecretKeySpec(hexToBytes(hexKey), "AES");
IvParameterSpec ivparameterspec = new IvParameterSpec(hexKey.getBytes("UTF8"), 0, 16);
cipher.init(Cipher.DECRYPT_MODE, secretKey, ivparameterspec);
byte[] cipherText = hexToBytes(encryptedText);
byte[] dcrbyte = cipher.doFinal(cipherText);
decryptedText = new String(dcrbyte, "UTF-8");
} catch (Exception E) {
System.out.println("Encrypt Exception : " + E.getMessage());
}
return decryptedText;
}
private static byte[] hexToBytes(String hexStr) {
byte[] val = new byte[hexStr.length() / 2];
for (int i = 0; i < val.length; i++) {
int idx = i * 2;
int j = Integer.parseInt(hexStr.substring(idx, idx + 2), 16);
val[i] = (byte) j;
}
return val;
}
private static String bytesToHex(byte[] hashInBytes) {
char[] hexArray = "0123456789ABCDEF".toCharArray();
char[] hexChars = new char[hashInBytes.length * 2];
for (int i = 0; i < hashInBytes.length; i++) {
int v = hashInBytes[i] & 0xFF;
hexChars[i * 2] = hexArray[v >>> 4];
hexChars[i * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
}
在 c# 中,我尝试像这样编写 decryptAes() function:
public static class Encryption
{
// use these parameters to test decryptAes()
//string key = "B8EE12E123C0E300A202074A153CC0D27D739357480FFFFFFFFFFFFFFFFFFFEF";
//string textToDecrypt = "756AD4D80E2CF1E289D55A23E092F012E8D5F372A343A419BC87F77B6335F04EFB41C3B56F5CDA167F90F67CD672A186";
public static string decryptAes(string key, string textToDecrypt)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
// Assumed Mode and padding values.
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.PKCS7;
// AssumedKeySize and BlockSize values.
rijndaelCipher.KeySize = 0x80; //128
rijndaelCipher.BlockSize = 0x80;
// Convert Hex keys to byte Array.
byte[] encryptedData = HexToBytes(textToDecrypt);
//byte[] pwdBytes = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(key);
byte[] pwdBytes = HexToBytes(key);
byte[] keyBytes = new byte[0x10]; //16
int len = pwdBytes.Length;
if (len > keyBytes.Length)
{
len = keyBytes.Length;
}
Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
// Decrypt data
byte[] plainText = rijndaelCipher.CreateDecryptor()
.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
return Encoding.UTF8.GetString(plainText);
}
public static byte[] HexToBytes(string str)
{
if (str.Length == 0 || str.Length % 2 != 0)
return new byte[0];
byte[] buffer = new byte[str.Length / 2];
char c;
for (int bx = 0, sx = 0; bx < buffer.Length; ++bx, ++sx)
{
// Convert first half of byte
c = str[sx];
buffer[bx] = (byte)((c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0')) << 4);
// Convert second half of byte
c = str[++sx];
buffer[bx] |= (byte)(c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0'));
}
return buffer;
}
public static string ByteToHex(byte[] ba)
{
StringBuilder hex = new StringBuilder(ba.Length * 2);
foreach (byte b in ba)
hex.AppendFormat("{0:x2}", b);
return hex.ToString().ToUpper();
}
}
但是 c# decryptAes() function 不能像我预期的那样工作。 一个错误
System.Security.Cryptography.CryptographicException: 'Padding is invalid and cannot be removed.'
发生在rijndaelCipher.Padding = PaddingMode.PKCS7;
当我更改为rijndaelCipher.Padding = PaddingMode.None
时,它无法按预期工作,c# 结果与 java 的结果不同。
请帮助,任何建议将不胜感激! 谢谢!
您需要为加密和解密显式设置填充。 除非您有其他理由,否则请使用 PKCS#7 填充。
rijndaelCipher.Padding=PaddingMode.none;
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