/// <summary>
/// Constructs a new key pair from a byte array
/// </summary>
///
/// <param name="KeyPair">An encoded key pair</param>
public NTRUKeyPair(byte[] KeyPair)
{
using (MemoryStream keyStream = new MemoryStream(KeyPair))
{
_publicKey = new NTRUPublicKey(keyStream);
_privateKey = new NTRUPrivateKey(keyStream);
}
}
/// <summary>
/// Constructs a new key pair
/// </summary>
///
/// <param name="PublicKey">The Public key</param>
/// <param name="PrivateKey">The Private Key</param>
///
/// <exception cref="NTRUException">Thrown if an invalid key is used</exception>
public NTRUKeyPair(IAsymmetricKey PublicKey, IAsymmetricKey PrivateKey)
{
if (!(PublicKey is NTRUPublicKey))
throw new NTRUException("NTRUKeyPair:CTor", "Not a valid NTRU Public key!", new InvalidDataException());
if (!(PrivateKey is NTRUPrivateKey))
throw new NTRUException("NTRUKeyPair:CTor", "Not a valid NTRU Private key!", new InvalidDataException());
_publicKey = (NTRUPublicKey)PublicKey;
_privateKey = (NTRUPrivateKey)PrivateKey;
}
/// <summary>
/// Constructs a new key pair
/// </summary>
///
/// <param name="PublicKey">The Public key</param>
/// <param name="PrivateKey">The Private Key</param>
///
/// <exception cref="NTRUException">Thrown if an invalid key is used</exception>
public NTRUKeyPair(IAsymmetricKey PublicKey, IAsymmetricKey PrivateKey)
{
if (!(PublicKey is NTRUPublicKey))
{
throw new NTRUException("NTRUKeyPair:CTor", "Not a valid NTRU Public key!", new InvalidDataException());
}
if (!(PrivateKey is NTRUPrivateKey))
{
throw new NTRUException("NTRUKeyPair:CTor", "Not a valid NTRU Private key!", new InvalidDataException());
}
_publicKey = (NTRUPublicKey)PublicKey;
_privateKey = (NTRUPrivateKey)PrivateKey;
}
/// <summary>
/// Constructs a new key pair
/// </summary>
///
/// <param name="Key">The public or private key</param>
///
/// <exception cref="NTRUException">Thrown if an invalid name is used</exception>
public NTRUKeyPair(IAsymmetricKey Key)
{
if (Key is NTRUPublicKey)
{
_publicKey = (NTRUPublicKey)PublicKey;
}
else if (Key is NTRUPrivateKey)
{
_privateKey = (NTRUPrivateKey)PrivateKey;
}
else
{
throw new NTRUException("NTRUKeyPair:CTor", "Not a valid NTRU key!", new InvalidDataException());
}
}
/// <summary>
/// Generates a new encryption key pair
/// </summary>
///
/// <param name="RngF">The random number generator to use for generating the secret polynomial f</param>
/// <param name="RngG">The random number generator to use for generating the secret polynomial g</param>
///
/// <returns>A key pair</returns>
private IAsymmetricKeyPair GenerateKeyPair(IRandom RngF, IRandom RngG)
{
int N = _encParams.N;
int q = _encParams.Q;
bool fastFp = _encParams.FastFp;
bool sparse = _encParams.Sparse;
TernaryPolynomialType polyType = _encParams.PolyType;
IPolynomial t = null;
IntegerPolynomial fq = null;
IntegerPolynomial fp = null;
IntegerPolynomial g = null;
if (ParallelUtils.IsParallel && _isParallel)
{
Action[] gA = new Action[] {
new Action(() => g = GenerateG(RngG)),
new Action(() => GenerateFQ(RngF, out t, out fq, out fp))
};
Parallel.Invoke(gA);
}
else
{
// Choose a random g that is invertible mod q.
g = GenerateG(RngG);
// choose a random f that is invertible mod 3 and q
GenerateFQ(RngF, out t, out fq, out fp);
}
// if fastFp=true, fp=1
if (fastFp)
{
fp = new IntegerPolynomial(N);
fp.Coeffs[0] = 1;
}
IntegerPolynomial h = g.Multiply(fq, q);
h.Mult3(q);
h.EnsurePositive(q);
NTRUPrivateKey priv = new NTRUPrivateKey(t, fp, N, q, sparse, fastFp, polyType);
NTRUPublicKey pub = new NTRUPublicKey(h, N, q);
return(new NTRUKeyPair(pub, priv));
}
/// <summary>
/// Constructs a new key pair
/// </summary>
///
/// <param name="Key">The public or private key</param>
///
/// <exception cref="NTRUException">Thrown if an invalid name is used</exception>
public NTRUKeyPair(IAsymmetricKey Key)
{
if (Key is NTRUPublicKey)
_publicKey = (NTRUPublicKey)PublicKey;
else if (Key is NTRUPrivateKey)
_privateKey = (NTRUPrivateKey)PrivateKey;
else
throw new NTRUException("NTRUKeyPair:CTor", "Not a valid NTRU key!", new InvalidDataException());
}
/// <summary>
/// Constructs a new key pair from an input stream
/// </summary>
///
/// <param name="KeyStream">An input stream containing an encoded key pair</param>
public NTRUKeyPair(MemoryStream KeyStream)
{
_publicKey = new NTRUPublicKey(KeyStream);
_privateKey = new NTRUPrivateKey(KeyStream);
}
/// <summary>
/// Constructs a new key pair from a byte array
/// </summary>
///
/// <param name="KeyPair">An encoded key pair</param>
public NTRUKeyPair(byte[] KeyPair)
{
using (MemoryStream keyStream = new MemoryStream(KeyPair))
{
_publicKey = new NTRUPublicKey(keyStream);
_privateKey = new NTRUPrivateKey(keyStream);
}
}
/// <summary>
/// Compare this object instance with another
/// </summary>
///
/// <param name="obj">Object to compare</param>
///
/// <returns>True if equal, otherwise false</returns>
public override bool Equals(Object obj)
{
if (this == obj)
{
return(true);
}
if (obj == null)
{
return(false);
}
NTRUPrivateKey other = (NTRUPrivateKey)obj;
if (N != other.N)
{
return(false);
}
if (_fastFp != other._fastFp)
{
return(false);
}
if (FP == null)
{
if (other.FP != null)
{
return(false);
}
}
else if (!FP.Equals(other.FP))
{
return(false);
}
if (PolyType != other.PolyType)
{
return(false);
}
if (Q != other.Q)
{
return(false);
}
if (_sparse != other._sparse)
{
return(false);
}
if (T == null)
{
if (other.T != null)
{
return(false);
}
}
else if (!T.Equals(other.T))
{
return(false);
}
return(true);
}
/// <summary>
/// Generates a new encryption key pair
/// </summary>
///
/// <param name="RngF">The random number generator to use for generating the secret polynomial f</param>
/// <param name="RngG">The random number generator to use for generating the secret polynomial g</param>
///
/// <returns>A key pair</returns>
private IAsymmetricKeyPair GenerateKeyPair(IRandom RngF, IRandom RngG)
{
int N = _ntruParams.N;
int q = _ntruParams.Q;
bool fastFp = _ntruParams.FastFp;
bool sparse = _ntruParams.Sparse;
TernaryPolynomialType polyType = _ntruParams.PolyType;
IPolynomial t = null;
IntegerPolynomial fq = null;
IntegerPolynomial fp = null;
IntegerPolynomial g = null;
if (ParallelUtils.IsParallel && _isParallel)
{
Action[] gA = new Action[] {
new Action(()=> g = GenerateG(RngG)),
new Action(()=> GenerateFQ(RngF, out t, out fq, out fp))
};
Parallel.Invoke(gA);
}
else
{
// Choose a random g that is invertible mod q.
g = GenerateG(RngG);
// choose a random f that is invertible mod 3 and q
GenerateFQ(RngF, out t, out fq, out fp);
}
// if fastFp=true, fp=1
if (fastFp)
{
fp = new IntegerPolynomial(N);
fp.Coeffs[0] = 1;
}
IntegerPolynomial h = g.Multiply(fq, q);
h.Mult3(q);
h.EnsurePositive(q);
NTRUPrivateKey priv = new NTRUPrivateKey(t, fp, N, q, sparse, fastFp, polyType);
NTRUPublicKey pub = new NTRUPublicKey(h, N, q);
return new NTRUKeyPair(pub, priv);
}
/// <summary>
/// Constructs a new key pair from an input stream
/// </summary>
///
/// <param name="KeyStream">An input stream containing an encoded key pair</param>
public NTRUKeyPair(MemoryStream KeyStream)
{
_publicKey = new NTRUPublicKey(KeyStream);
_privateKey = new NTRUPrivateKey(KeyStream);
}
