/// <summary>
/// The equals.
/// </summary>
/// <param name="other">
/// The other.
/// </param>
/// <returns>
/// The <see cref="bool"/>.
/// </returns>
protected bool Equals(SecretKey other)
{
return(this.bytes.SequenceEqual(other.bytes));
}
/// <summary>
/// The generate secret key.
/// </summary>
/// <returns>
/// The <see cref="SecretKey"/>.
/// </returns>
public SecretKey GenerateSecretKey()
{
var kgp = new KeyGenerationParameters(new SecureRandom(), DesEdeParameters.DesEdeKeyLength * 8);
var kg = new DesEdeKeyGenerator();
kg.Init(kgp);
var key = new SecretKey(kg.GenerateKey());
return key;
}
/// <summary>
/// The encode secret key.
/// </summary>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
public string EncodeSecretKey(SecretKey key)
{
var data = key.GetBytes();
var encoded = Convert.ToBase64String(data);
return encoded;
}
/// <summary>
/// The symmetric decrypt.
/// </summary>
/// <param name="crypted">
/// The crypted.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
public string SymmetricDecrypt(Message crypted)
{
SecretKey key = this.keyMaster.DecodeSecretKey(crypted.Key);
return(this.Decrypt(crypted.Data, key));
}
/// <summary>
/// encrypts the given secret key with the given public key
/// </summary>
/// <param name="secretKey">
/// The secret key.
/// </param>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
private string Encrypt(SecretKey secretKey, PublicKey key)
{
string data = this.keyMaster.EncodeSecretKey(secretKey);
return(this.Encrypt(data, key));
}
/// <summary>
/// The encrypt.
/// </summary>
/// <param name="data">
/// The data.
/// </param>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
private string Encrypt(string data, SecretKey key)
{
byte[] bytes = Encoding.UTF8.GetBytes(data);
// Setup the DESede cipher engine, create a PaddedBufferedBlockCipher in CBC mode.
byte[] keyBytes = key.GetBytes();
var cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(new DesEdeEngine()));
// initialise the cipher with the key bytes, for encryption
cipher.Init(true, new KeyParameter(keyBytes));
int inBlockSize = bytes.Length;
int outBlockSize = cipher.GetOutputSize(inBlockSize);
var inblock = bytes;
var outblock = new byte[outBlockSize];
cipher.ProcessBytes(inblock, 0, inBlockSize, outblock, 0);
cipher.DoFinal(outblock, 0);
return Convert.ToBase64String(outblock);
}
/// <summary>
/// encrypts the given secret key with the given public key
/// </summary>
/// <param name="secretKey">
/// The secret key.
/// </param>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
private string Encrypt(SecretKey secretKey, PublicKey key)
{
string data = this.keyMaster.EncodeSecretKey(secretKey);
return this.Encrypt(data, key);
}
/// <summary>
/// The decrypt.
/// </summary>
/// <param name="encrypted">
/// The encrypted.
/// </param>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
private string Decrypt(string encrypted, SecretKey key)
{
byte[] bytes = Convert.FromBase64String(encrypted);
byte[] keyBytes = key.GetBytes();
// initialise the cipher for decryption
var cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(new DesEdeEngine()));
cipher.Init(false, new KeyParameter(keyBytes));
int inBlockSize = bytes.Length;
int outBlockSize = cipher.GetOutputSize(inBlockSize);
var inblock = bytes;
var outblock = new byte[outBlockSize];
cipher.ProcessBytes(inblock, 0, inBlockSize, outblock, 0);
cipher.DoFinal(outblock, 0);
var clear = this.ToUTF8String(outblock);
return clear;
}
/// <summary>
/// The symmetric encrypt.
/// </summary>
/// <param name="message">
/// The message.
/// </param>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="Message"/>.
/// </returns>
public Message SymmetricEncrypt(string message, SecretKey key)
{
string dataString = this.Encrypt(message, key);
string keyString = this.keyMaster.EncodeSecretKey(key);
return new Message(keyString, dataString);
}
/// <summary>
/// The equals.
/// </summary>
/// <param name="other">
/// The other.
/// </param>
/// <returns>
/// The <see cref="bool"/>.
/// </returns>
protected bool Equals(SecretKey other)
{
return this.bytes.SequenceEqual(other.bytes);
}
