/// <summary>
/// Creates a
/// <see cref="PrivateKeySignature"/>
/// instance.
/// </summary>
/// <param name="pk">
/// A
/// <see cref="Org.BouncyCastle.Crypto.ICipherParameters"/>
/// object.
/// </param>
/// <param name="hashAlgorithm">A hash algorithm (e.g. "SHA-1", "SHA-256",...).</param>
/// <param name="provider">A security provider (e.g. "BC").</param>
public PrivateKeySignature(ICipherParameters pk, String hashAlgorithm)
{
this.pk = pk;
this.hashAlgorithm = DigestAlgorithms.GetDigest(DigestAlgorithms.GetAllowedDigest(hashAlgorithm));
this.encryptionAlgorithm = SignUtils.GetPrivateKeyAlgorithm(pk);
}