public void SaveFile(string name, Stream data)
{
string documentsPath = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, "Temp");
Directory.CreateDirectory(documentsPath);
string filePath = Path.Combine(documentsPath, name);
// Length is 16 byte
Cipher cipher = Cipher.GetInstance("AES/CBC/PKCS5Padding");
byte[] raw = System.Text.Encoding.Default.GetBytes(sKey);
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
IvParameterSpec iv = new IvParameterSpec(System.Text.Encoding.Default.GetBytes(ivParameter));//
cipher.Init(CipherMode.EncryptMode, skeySpec, iv);
// Wrap the output stream
CipherInputStream cis = new CipherInputStream(data, cipher);
byte[] bArray = new byte[1024 * 1024];
int b;
using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
{
while ((b = cis.Read(bArray)) != -1)
{
fs.Write(bArray, 0, b);
}
}
}
public string DecryptKey(string encryptedKey)
{
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry)_keyStore.GetEntry(_alias, null);
if (privateKeyEntry == null)
{
return(null);
}
var privateKey = privateKeyEntry.PrivateKey;
Cipher cipher = Cipher.GetInstance("RSA/ECB/PKCS1Padding");
cipher.Init(CipherMode.DecryptMode, privateKey);
byte[] encryptedBytes = Nethereum.Hex.HexConvertors.Extensions.HexByteConvertorExtensions.HexToByteArray(encryptedKey);
CipherInputStream cipherInputStream = new CipherInputStream(
new MemoryStream(encryptedBytes), cipher);
List <byte> values = new List <byte>();
int nextByte;
while ((nextByte = cipherInputStream.Read()) != -1)
{
values.Add((byte)nextByte);
}
return(Encoding.UTF8.GetString(values.ToArray(), 0, values.Count));
}
public void encrypt(string filename, string path)
{
// Here you read the cleartext.
try
{
var extStore = new Java.IO.File("/storage/emulated/0/jukebox/Songs");
startTime = System.DateTime.Now.Millisecond;
Android.Util.Log.Error("Encryption Started", extStore + "/" + filename);
// This stream write the encrypted text. This stream will be wrapped by
// another stream.
createFile(filename, extStore);
var webRequest = WebRequest.Create(path);
using (var response = webRequest.GetResponse())
using (var content = response.GetResponseStream())
using (var reader = new StreamReader(content))
{
var strContent = reader.ReadToEnd();
// System.IO.FileStream fs = System.IO.File.OpenWrite(path);
FileOutputStream fos = new FileOutputStream(extStore + "/" + filename + ".aes", false);
// Length is 16 byte
Cipher cipher = Cipher.GetInstance("AES/CBC/PKCS5Padding");
byte[] raw = System.Text.Encoding.Default.GetBytes(sKey);
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
IvParameterSpec iv = new IvParameterSpec(System.Text.Encoding.Default.GetBytes(ivParameter));//
cipher.Init(Javax.Crypto.CipherMode.EncryptMode, skeySpec, iv);
// Wrap the output stream
CipherInputStream cis = new CipherInputStream(content, cipher);
// Write bytes
int b;
byte[] d = new byte[1024 * 1024];
while ((b = cis.Read(d)) != -1)
{
fos.Write(d, 0, b);
}
// Flush and close streams.
fos.Flush();
fos.Close();
cis.Close();
stopTime = System.DateTime.Now.Millisecond;
Android.Util.Log.Error("Encryption Ended", extStore + "/5mbtest/" + filename + ".aes");
Android.Util.Log.Error("Time Elapsed", ((stopTime - startTime) / 1000.0) + "");
}
}
catch (Exception e)
{
Android.Util.Log.Error("lv", e.Message);
}
}
public virtual void decrypt(Stream paramInputStream, Stream paramOutputStream)
{
try
{
paramInputStream = new CipherInputStream(paramInputStream, this.dcipher);
int i = 0;
while ((i = paramInputStream.Read(this.buf, 0, this.buf.Length)) >= 0)
{
paramOutputStream.Write(this.buf, 0, i);
}
paramOutputStream.Close();
}
catch (IOException)
{
}
}
private byte[] RSADecrypt(byte[] encrypted)
{
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry)_keyStore.GetEntry(_secureStoredKeyAlias, null);
Cipher output = Cipher.GetInstance(_RSAMode, "AndroidOpenSSL");
IKey pk = privateKeyEntry.PrivateKey;
output.Init(CipherMode.DecryptMode, pk);
CipherInputStream cipherInputStream = new CipherInputStream(new MemoryStream(encrypted), output);
List <byte> values = new List <byte>();
int nextByte;
while ((nextByte = cipherInputStream.Read()) != -1)
{
values.Add((byte)nextByte);
}
return(values.ToArray());
}
