Here we using the TripleDES Encryption and Decryption code in Android
import org.apache.commons.codec.binary.Base64; import java.security.MessageDigest; import java.security.spec.KeySpec; import java.util.Arrays; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec;
public class TripleDES { String secretKey = "YOUR_KEY"; public String _encrypt(String message) throws Exception { MessageDigest md = MessageDigest.getInstance("md5"); byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8")); byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24); for (int j = 0, k = 16; j < 8;) { keyBytes[k++] = keyBytes[j++]; } KeySpec keySpec = new DESedeKeySpec(keyBytes); SecretKey key = SecretKeyFactory.getInstance("DESede").generateSecret(keySpec); Cipher cipher = Cipher.getInstance("DESede"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] plainTextBytes = message.getBytes("utf-8"); byte[] buf = cipher.doFinal(plainTextBytes); byte[] base64Bytes = Base64.encodeBase64(buf); String base64EncryptedString = new String(base64Bytes); return base64EncryptedString; } public String _decrypt(String encryptedText) throws Exception { byte[] message = Base64.decodeBase64(encryptedText.getBytes("utf-8")); MessageDigest md = MessageDigest.getInstance("md5"); byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8")); byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24); for (int j = 0, k = 16; j < 8;) { keyBytes[k++] = keyBytes[j++]; } KeySpec keySpec = new DESedeKeySpec(keyBytes); SecretKey key = SecretKeyFactory.getInstance("DESede").generateSecret(keySpec); Cipher decipher = Cipher.getInstance("DESede"); decipher.init(Cipher.DECRYPT_MODE, key); byte[] plainText = decipher.doFinal(message); String result = new String(plainText, "UTF-8"); return result; } }
Then we using the same in .NET like this
using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Security.Cryptography;
using System.Text;
public class CryptorEngine
{
/// <summary>
/// Encrypt a string using dual encryption method. Return a encrypted cipher Text
/// </summary>
/// <param name="toEncrypt">string to be encrypted</param>
/// <param name="useHashing">use hashing? send to for extra secirity</param>
/// <returns></returns>
///
static string key = "YOUR_KEY";
public static string Encrypt(string toEncrypt, bool useHashing)
{
byte[] keyArray;
byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();
// Get the key from config file
//string key = "YOUR_KEY";// (string)settingsReader.GetValue("SecurityKey", typeof(String));
//System.Windows.Forms.MessageBox.Show(key);
if (useHashing)
{
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
hashmd5.Clear();
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(key);
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = keyArray;
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateEncryptor();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();
return Convert.ToBase64String(resultArray, 0, resultArray.Length);
}
/// <summary>
/// DeCrypt a string using dual encryption method. Return a DeCrypted clear string
/// </summary>
/// <param name="cipherString">encrypted string</param>
/// <param name="useHashing">Did you use hashing to encrypt this data? pass true is yes</param>
/// <returns></returns>
public static string Decrypt(string cipherString, bool useHashing)
{
byte[] keyArray;
byte[] toEncryptArray = Convert.FromBase64String(cipherString);
System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();
//Get your key from config file to open the lock!
//string key = "YOUR_KEY"; //(string)settingsReader.GetValue("SecurityKey", typeof(String));
if (useHashing)
{
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
hashmd5.Clear();
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(key);
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = keyArray;
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateDecryptor();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();
return UTF8Encoding.UTF8.GetString(resultArray);
}
}
