/// <summary>
/// The decrypt.
/// </summary>
/// <param name="encrypted">
/// The encrypted.
/// </param>
/// <param name="pk">
/// The pk.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
private string Decrypt(string encrypted, PrivateKey pk)
{
var keyParam = pk.GetPrivateKeyParam();
var engine = new Pkcs1Encoding(new RsaEngine());
engine.Init(false, keyParam);
var blockSize = engine.GetInputBlockSize();
byte[] bytes = Convert.FromBase64String(encrypted);
byte[] dec = engine.ProcessBlock(bytes, 0, blockSize);
var clear = this.ToUTF8String(dec);
return clear;
}
/// <summary>
/// The hybrid decrypt.
/// </summary>
/// <param name="crypted">
/// The crypted.
/// </param>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
public string HybridDecrypt(Message crypted, PrivateKey key)
{
string secretKeyData = this.Decrypt(crypted.Key, key);
SecretKey secretKey = this.keyMaster.DecodeSecretKey(secretKeyData);
string message = this.Decrypt(crypted.Data, secretKey);
return message;
}
/// <summary>
/// generates a key pair.
/// </summary>
/// <param name="keySize">
/// The key Size in bits
/// </param>
/// <returns>
/// The <see cref="KeyPair"/>.
/// </returns>
public KeyPair GenerateKeyPair(int keySize)
{
var g = new RsaKeyPairGenerator();
g.Init(new KeyGenerationParameters(new SecureRandom(), keySize));
var kp = g.GenerateKeyPair();
var puk = new PublicKey(kp.Public);
var prk = new PrivateKey(kp.Private);
var keyPair = new KeyPair { PublicKey = puk, PrivateKey = prk };
return keyPair;
}
/// <summary>
/// The public decrypt.
/// </summary>
/// <param name="crypted">
/// The crypted.
/// </param>
/// <param name="key">
/// The key.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
public string PublicDecrypt(Message crypted, PrivateKey key)
{
return this.Decrypt(crypted.Data, key);
}
/// <summary>
/// The equals.
/// </summary>
/// <param name="other">
/// The other.
/// </param>
/// <returns>
/// The <see cref="bool"/>.
/// </returns>
protected bool Equals(PrivateKey other)
{
return this.privateKeyParam.Equals(other.privateKeyParam);
}
/// <summary>
/// The equals.
/// </summary>
/// <param name="other">
/// The other.
/// </param>
/// <returns>
/// The <see cref="bool"/>.
/// </returns>
protected bool Equals(PrivateKey other)
{
return(this.privateKeyParam.Equals(other.privateKeyParam));
}
