public override void GenerateKey(ECCurve curve)
{
curve.Validate();
var keySizeInByted = curve.Prime.Length;
KeySize = keySizeInByted * 8;
BigInteger
prime = CryptoUtils.Normalize(new BigInteger(curve.Prime), _modulus),
subgroupOrder = CryptoUtils.Normalize(new BigInteger(curve.Order), _modulus) /
CryptoUtils.Normalize(new BigInteger(curve.Cofactor), _modulus),
a = CryptoUtils.Normalize(new BigInteger(curve.A), _modulus);
var privateKey = new byte[keySizeInByted];
BigInteger key;
do
{
CryptoUtils.StaticRandomNumberGenerator.GetBytes(privateKey);
key = CryptoUtils.Normalize(new BigInteger(privateKey), _modulus);
} while (BigInteger.Zero >= key || key >= subgroupOrder);
var basePoint = new BigIntegerPoint(curve.G, _modulus);
var publicKey = BigIntegerPoint.Multiply(basePoint, key, prime, a).ToECPoint(KeySize);
CryptoUtils.EraseData(ref _privateKey);
_curve = curve.Clone();
_publicKey = publicKey;
_privateKey = privateKey;
_parametersSet = true;
}
/// <summary>
/// Releases the unmanaged resources used by the <see cref="MagmaManagedTransform" />
/// class and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">
/// <see langword="true"/> to release both managed and unmanaged resources;
/// <see langword="false"/> to release only unmanaged resources.
/// </param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
CryptoUtils.EraseData(ref _keyExpansion);
}
base.Dispose(disposing);
}
private void Reset()
{
CryptoUtils.EraseData(ref _depadBuffer);
if (_cipherMode == CipherMode.CBC || _cipherMode == CipherMode.CFB || _cipherMode == CipherMode.OFB)
{
Buffer.BlockCopy(_rgbIV, 0, _stateBuffer, 0, _rgbIV !.Length);
}
}
/// <summary>
/// Releases the unmanaged resources used by the <see cref="SymmetricTransform" /> class
/// and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">
/// <see langword="true"/> to release both managed and unmanaged resources;
/// <see langword="false"/> to release only unmanaged resources.
/// </param>
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
CryptoUtils.EraseData(ref _rgbKey !);
CryptoUtils.EraseData(ref _rgbIV);
CryptoUtils.EraseData(ref _depadBuffer);
CryptoUtils.EraseData(ref _stateBuffer);
CryptoUtils.EraseData(ref _tempBuffer);
}
}
/// <summary>
/// Releases the unmanaged resources used by the <see cref="GostECDsa256Managed"/> class
/// and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">
/// <see langword="true"/>true to release both managed and unmanaged resources;
/// <see langword="false"/> to release only unmanaged resources.
/// </param>
protected override void Dispose(bool disposing)
{
if (!_disposed)
{
CryptoUtils.EraseData(ref _privateKey);
if (disposing)
{
CryptoUtils.EraseData(ref _curve.Prime);
CryptoUtils.EraseData(ref _curve.A);
CryptoUtils.EraseData(ref _curve.B);
CryptoUtils.EraseData(ref _curve.Order);
CryptoUtils.EraseData(ref _curve.Cofactor);
CryptoUtils.EraseData(ref _publicKey.X);
CryptoUtils.EraseData(ref _publicKey.Y);
var g = _curve.G;
CryptoUtils.EraseData(ref g.X);
CryptoUtils.EraseData(ref g.Y);
}
}
base.Dispose(disposing);
_disposed = true;
}
