Now a days people are more concerning about securing the data while transmitting over the http.Here is a code snippets which shows that how the Data in encrypted using Two different Keys called a Pass Phrase and Salt Key and Encrypt the data Also a code to decrypt the encrypted data in C# using the same Pass Phrase and Salt key.
Here Salt Key is just a Name give to a IVParamSpec Parameter.
//Android Code
public class MyCrypto {
public static final String TAG = "crypto";
private static Cipher aesCipher;
private static SecretKey secretKey;
private static IvParameterSpec ivParameterSpec;
private static String TRANSFORMATION_CIPHER = "AES/CBC/PKCS5Padding";
private static String ALGORITHM_CIPHER = "AES";
// Replace below with a 16-byte key, share between Java and C#
private static byte[] saltSecretKey = {0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
private static String ALGORITHM_DIGEST = "MD5";
public MyCrypto(String passphrase) {
byte[] passwordKey = encodeDigest(passphrase);
try {
aesCipher = Cipher.getInstance(TRANSFORMATION_CIPHER);
secretKey = new SecretKeySpec(passwordKey, ALGORITHM_CIPHER);
ivParameterSpec = new IvParameterSpec(saltSecretKey);
} catch (NoSuchAlgorithmException e) {
Log.e(TAG, "No such algorithm " + ALGORITHM_CIPHER, e);
} catch (NoSuchPaddingException e) {
Log.e(TAG, "No such padding PKCS5", e);
}
}
public String encryptAsBase64(byte[] clearData) {
byte[] encryptedData = encrypt(clearData);
return Base64.encodeToString(encryptedData,Base64.DEFAULT);
}
public byte[] encrypt(byte[] clearData) {
byte[] encryptedData;
try {
aesCipher.init(Cipher.ENCRYPT_MODE, secretKey, ivParameterSpec);
encryptedData = aesCipher.doFinal(clearData);
} catch (InvalidKeyException e) {
Log.e(TAG, "Invalid key", e);
return null;
} catch (InvalidAlgorithmParameterException e) {
Log.e(TAG, "Invalid algorithm " + ALGORITHM_CIPHER, e);
return null;
} catch (IllegalBlockSizeException e) {
Log.e(TAG, "Illegal block size", e);
return null;
} catch (BadPaddingException e) {
Log.e(TAG, "Bad padding", e);
return null;
}
return encryptedData;
}
private byte[] encodeDigest(String text) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance(ALGORITHM_DIGEST);
return digest.digest(text.getBytes());
} catch (NoSuchAlgorithmException e) {
Log.e(TAG, "No such algorithm " + ALGORITHM_DIGEST, e);
}
return null;
}
}
// C# Code
public class MyCrypto
{
private ICryptoTransform rijndaelDecryptor;
// Replace below with a 16-byte key, share between Java and C#
private static byte[] saltSecretKey = {0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
public MyCrypto(string passphrase)
{
byte[] passwordKey = encodeDigest(passphrase);
RijndaelManaged rijndael = new RijndaelManaged();
rijndaelDecryptor = rijndael.CreateDecryptor(passwordKey, rawSecretKey);
}
public string Decrypt(byte[] encryptedData)
{
byte[] newClearData = rijndaelDecryptor.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
return Encoding.ASCII.GetString(newClearData);
}
public string DecryptFromBase64(string encryptedBase64)
{
return Decrypt(Convert.FromBase64String(encryptedBase64));
}
private byte[] encodeDigest(string text)
{
MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] data = Encoding.ASCII.GetBytes(text);
return x.ComputeHash(data);
}
}
What is rawsecretkey here?? in c# code
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