/// <exception cref="System.Exception"></exception>
public override void Init(int mode, byte[] key, byte[] iv)
{
string pad = "NoPadding";
//if(padding) pad="PKCS5Padding";
byte[] tmp;
if (iv.Length > ivsize)
{
tmp = new byte[ivsize];
System.Array.Copy(iv, 0, tmp, 0, tmp.Length);
iv = tmp;
}
if (key.Length > bsize)
{
tmp = new byte[bsize];
System.Array.Copy(key, 0, tmp, 0, tmp.Length);
key = tmp;
}
try
{
cipher = Sharpen.Cipher.GetInstance("DESede/CTR/" + pad);
DESedeKeySpec keyspec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.GetInstance("DESede");
SecretKey _key = keyfactory.GenerateSecret(keyspec);
cipher.Init((mode == ENCRYPT_MODE ? Sharpen.Cipher.ENCRYPT_MODE : Sharpen.Cipher.
DECRYPT_MODE), _key, new IvParameterSpec(iv));
}
catch (Exception e)
{
cipher = null;
throw;
}
}
public void Add(string key, string value)
{
PBEKeySpec keyspec = new PBEKeySpec(value.ToCharArray());
SecretKeyFactory fk = SecretKeyFactory.GetInstance("PBEWithMD5andDES");
ISecretKey mysec = fk.GenerateSecret(keyspec);
KeyStore.SecretKeyEntry entry = new KeyStore.SecretKeyEntry(mysec);
keyStore.SetEntry(key, entry, Password);
Save();
}
public AESObfuscator(byte[] salt, string password)
{
try {
SecretKeyFactory factory = SecretKeyFactory.GetInstance(KEYGEN_ALGORITHM);
PBEKeySpec keySpec =
new PBEKeySpec(password.ToCharArray(), salt, 1024, 256);
ISecretKey tmp = factory.GenerateSecret(keySpec);
ISecretKey secret = new SecretKeySpec(tmp.GetEncoded(), "AES");
mEncryptor = Cipher.GetInstance(CIPHER_ALGORITHM);
mEncryptor.Init(Cipher.EncryptMode, secret, new IvParameterSpec(IV));
mDecryptor = Cipher.GetInstance(CIPHER_ALGORITHM);
mDecryptor.Init(Cipher.DecryptMode, secret, new IvParameterSpec(IV));
} catch (GeneralSecurityException e) {
// This can't happen on a compatible Android device.
throw new RuntimeException("Invalid environment", e);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="AesObfuscator"/> class.
/// The aes obfuscator.
/// </summary>
/// <param name="salt">
/// an array of random bytes to use for each (un)obfuscation
/// </param>
/// <param name="applicationId">
/// application identifier, e.g. the package name
/// </param>
/// <param name="deviceId">
/// device identifier. Use as many sources as possible to
/// create this unique identifier.
/// </param>
public AesObfuscator(byte[] salt, string applicationId, string deviceId)
{
try
{
SecretKeyFactory factory = SecretKeyFactory.GetInstance(KeygenAlgorithm);
IKeySpec keySpec = new PBEKeySpec((applicationId + deviceId).ToCharArray(), salt, 1024, 256);
ISecretKey tmp = factory.GenerateSecret(keySpec);
ISecretKey secret = new SecretKeySpec(tmp.GetEncoded(), "AES");
this.encryptor = Cipher.GetInstance(CipherAlgorithm);
this.encryptor.Init(CipherMode.EncryptMode, secret, new IvParameterSpec(Iv));
this.decryptor = Cipher.GetInstance(CipherAlgorithm);
this.decryptor.Init(CipherMode.DecryptMode, secret, new IvParameterSpec(Iv));
}
catch (GeneralSecurityException e)
{
// This can't happen on a compatible Android device.
throw new RuntimeException("Invalid environment", e);
}
}