public SignatureManager(DSASigner dsa_signer)
{
if (dsa_signer == null)
{
throw new ArgumentException("SignatureManager: DSA signer object cannot be null");
}
_dsa_signer = dsa_signer;
_dsa_public_key_bytes_encoded = new byte[_dsa_signer.GetPublicKeyEncodedMpi().Length];
Buffer.BlockCopy(_dsa_signer.GetPublicKeyEncodedMpi(), 0, _dsa_public_key_bytes_encoded, 0, _dsa_public_key_bytes_encoded.Length);
}