/// <summary>
/// Generate an encryption Key pair
/// </summary>
///
/// <returns>A McElieceKeyPair containing public and private keys</returns>
public IAsymmetricKeyPair GenerateKeyPair()
{
// finite field GF(2^m)
GF2mField field = new GF2mField(_M, _fieldPoly);
// irreducible Goppa polynomial
PolynomialGF2mSmallM gp = new PolynomialGF2mSmallM(field, _T, PolynomialGF2mSmallM.RANDOM_IRREDUCIBLE_POLYNOMIAL, _rndEngine);
PolynomialRingGF2m ring = new PolynomialRingGF2m(field, gp);
// matrix for computing square roots in (GF(2^m))^t
PolynomialGF2mSmallM[] qInv = ring.SquareRootMatrix;
// generate canonical check matrix
GF2Matrix h = GoppaCode.CreateCanonicalCheckMatrix(field, gp);
// compute short systematic form of check matrix
GoppaCode.MaMaPe mmp = GoppaCode.ComputeSystematicForm(h, _rndEngine);
GF2Matrix shortH = mmp.SecondMatrix;
Permutation p = mmp.Permutation;
// compute short systematic form of generator matrix
GF2Matrix shortG = (GF2Matrix)shortH.ComputeTranspose();
// obtain number of rows of G (= dimension of the code)
int k = shortG.RowCount;
// generate keys
IAsymmetricKey pubKey = new MPKCPublicKey(_N, _T, shortG);
IAsymmetricKey privKey = new MPKCPrivateKey(_N, k, field, gp, p, h, qInv);
// return key pair
return(new MPKCKeyPair(pubKey, privKey));
}
/// <summary>
/// Decides whether the given object <c>other</c> is the same as this field
/// </summary>
///
/// <param name="Obj">The object for comparison</param>
///
/// <returns>Returns <c>(this == other)</c></returns>
public override bool Equals(Object Obj)
{
if (Obj == null || !(Obj is MPKCPublicKey))
{
return(false);
}
MPKCPublicKey key = (MPKCPublicKey)Obj;
if (N != key.N)
{
return(false);
}
if (T != key.T)
{
return(false);
}
if (!G.Equals(key.G))
{
return(false);
}
return(true);
}
/// <summary>
/// Get the asymmetric public key from a stream
/// </summary>
///
/// <param name="KeyStream">The encoded public key</param>
/// <param name="Parameters">The cipher parameters</param>
///
/// <returns>The public key</returns>
private IAsymmetricKey GetAsymmetricPublicKey(Stream KeyStream, IAsymmetricParameters Parameters)
{
IAsymmetricKey key = null;
try
{
if (Parameters.GetType().Equals(typeof(NTRUParameters)))
key = new NTRUPublicKey(KeyStream);
else if (Parameters.GetType().Equals(typeof(MPKCParameters)))
key = new MPKCPublicKey(KeyStream);
else if (Parameters.GetType().Equals(typeof(RLWEParameters)))
key = new RLWEPublicKey(KeyStream);
return key;
}
catch (Exception ex)
{
throw new CryptoProcessingException("DtmKex:GetAsymmetricPublicKey", "The public key could not be loaded!", ex);
}
}
/// <summary>
/// Generate an encryption Key pair
/// </summary>
///
/// <returns>A McElieceKeyPair containing public and private keys</returns>
public IAsymmetricKeyPair GenerateKeyPair()
{
// finite field GF(2^m)
GF2mField field = new GF2mField(_M, _fieldPoly);
// irreducible Goppa polynomial
PolynomialGF2mSmallM gp = new PolynomialGF2mSmallM(field, _T, PolynomialGF2mSmallM.RANDOM_IRREDUCIBLE_POLYNOMIAL, _rndEngine);
PolynomialRingGF2m ring = new PolynomialRingGF2m(field, gp);
// matrix for computing square roots in (GF(2^m))^t
PolynomialGF2mSmallM[] qInv = ring.SquareRootMatrix;
// generate canonical check matrix
GF2Matrix h = GoppaCode.CreateCanonicalCheckMatrix(field, gp);
// compute short systematic form of check matrix
GoppaCode.MaMaPe mmp = GoppaCode.ComputeSystematicForm(h, _rndEngine);
GF2Matrix shortH = mmp.SecondMatrix;
Permutation p = mmp.Permutation;
// compute short systematic form of generator matrix
GF2Matrix shortG = (GF2Matrix)shortH.ComputeTranspose();
// obtain number of rows of G (= dimension of the code)
int k = shortG.RowCount;
// generate keys
IAsymmetricKey pubKey = new MPKCPublicKey(_N, _T, shortG);
IAsymmetricKey privKey = new MPKCPrivateKey(_N, k, field, gp, p, h, qInv);
// return key pair
return new MPKCKeyPair(pubKey, privKey);
}
