/// <summary>
/// Creates a new Passphrase rng whose output differs but is a
/// function of this rng's internal state.
/// </summary>
///
/// <param name="Digest">The digest instance</param>
///
/// <returns>Returns a PassphrasePrng instance</returns>
public PBPRng CreateBranch(IDigest Digest)
{
PBPRng branch = new PBPRng();
try
{
branch.m_digest = Digest;
}
catch (Exception e)
{
throw new Exception(e.Message);
}
branch.m_rndData = (byte[])m_rndData.Clone();
branch.m_rndData[0]++;
return(branch);
}
/// <summary>
/// Generates an encryption key pair using a passphrase based prng.
/// <para>Invoking this method with the same passphrase and salt will always return the same key pair.</para>
/// </summary>
///
/// <param name="Passphrase">The passphrase</param>
/// <param name="Salt">Salt for the passphrase; can be <c>null</c> but this is strongly discouraged</param>
///
/// <returns>A populated IAsymmetricKeyPair</returns>
public IAsymmetricKeyPair GenerateKeyPair(byte[] Passphrase, byte[] Salt)
{
using (IDigest dgt = GetDigest(_ntruParams.Digest))
{
using (IRandom rnd = new PBPRng(dgt, Passphrase, Salt, 10000, false))
{
IRandom rng2 = ((PBPRng)rnd).CreateBranch(dgt);
return GenerateKeyPair(rnd, rng2);
}
}
}
/// <summary>
/// Creates a new Passphrase rng whose output differs but is a
/// function of this rng's internal state.
/// </summary>
///
/// <param name="Digest">The digest instance</param>
///
/// <returns>Returns a PassphrasePrng instance</returns>
public PBPRng CreateBranch(IDigest Digest)
{
PBPRng branch = new PBPRng();
try
{
branch._digest = Digest;
}
catch (Exception e)
{
throw new Exception(e.Message);
}
branch._rndData = (byte[])_rndData.Clone();
branch._rndData[0]++;
return branch;
}
/// <summary>
/// Generates an encryption key pair using a passphrase based prng.
/// <para>Invoking this method with the same passphrase and salt will always return the same key pair.</para>
/// </summary>
///
/// <param name="Passphrase">The passphrase</param>
/// <param name="Salt">Salt for the passphrase; can be <c>null</c> but this is strongly discouraged</param>
///
/// <returns>A populated IAsymmetricKeyPair</returns>
public IAsymmetricKeyPair GenerateKeyPair(byte[] Passphrase, byte[] Salt)
{
using (IDigest dgt = GetDigest(_mpkcParams.Digest))
{
using (IRandom rnd = new PBPRng(dgt, Passphrase, Salt, 10000, false))
return GenerateKeyPair();
}
}
/// <summary>
/// Generates an encryption key pair using a passphrase based drbg.
/// <para>Invoking this method with the same passphrase and salt will always return the same key pair.</para>
/// </summary>
///
/// <param name="Passphrase">The passphrase</param>
/// <param name="Salt">Salt for the passphrase; can be <c>null</c> but this is strongly discouraged</param>
///
/// <returns>A populated IAsymmetricKeyPair</returns>
public IAsymmetricKeyPair GenerateKeyPair(byte[] Passphrase, byte[] Salt)
{
_dgtEngine.Reset();
using (IRandom rnd = new PBPRng(_dgtEngine, Passphrase, Salt, 10000, false))
{
IRandom rng2 = ((PBPRng)rnd).CreateBranch(_dgtEngine);
return GenerateKeyPair(rnd, rng2);
}
}
