/// <summary>
/// Construct a key pair generator for DSA keys.
/// </summary>
/// <param name="keyGenParameters">Domain parameters and algorithm for the generated key.</param>
/// <param name="random">A source of randomness for calculating the private value.</param>
internal KeyPairGenerator(KeyGenerationParameters keyGenParameters, SecureRandom random) : base(keyGenParameters)
{
if (CryptoServicesRegistrar.IsInApprovedOnlyMode())
{
int effSizeInBits = keyGenParameters.DomainParameters.P.BitLength;
if (effSizeInBits != 2048 && effSizeInBits != 3072)
{
throw new CryptoUnapprovedOperationError("attempt to create key pair with unapproved key size [" + effSizeInBits + "]", keyGenParameters.Algorithm);
}
Utils.ValidateKeyPairGenRandom(random, Utils.GetAsymmetricSecurityStrength(effSizeInBits), keyGenParameters.Algorithm);
}
this.domainParameters = keyGenParameters.DomainParameters;
this.param = new DsaKeyGenerationParameters(random, getDomainParams(domainParameters));
this.engine.Init(param);
}
private static DsaParameters getDomainParams(DsaDomainParameters dsaParams)
{
return(new DsaParameters(dsaParams.P, dsaParams.Q, dsaParams.G));
}
/// <summary>
/// Base constructor for the default algorithm ID.
/// </summary>
/// <param name="domainParameters">DSA domain parameters representing the parameter set any generated keys will be for.</param>
public KeyGenerationParameters(DsaDomainParameters domainParameters) : base(Alg)
{
this.domainParameters = domainParameters;
}
