/**
* What we get back from the signer are the two components of a signature, r and s. To get a flat byte stream
* of the type used by Bitcoin we have to encode them using DER encoding, which is just a way to pack the two
* components into a structure.
*/
public byte[] ToDER()
{
// Usually 70-72 bytes.
MemoryStream bos = new MemoryStream(72);
DerSequenceGenerator seq = new DerSequenceGenerator(bos);
seq.AddObject(new DerInteger(R));
seq.AddObject(new DerInteger(S));
seq.Close();
return bos.ToArray();
}
public byte[] ToDER(bool compressed)
{
AssertPrivateKey();
MemoryStream baos = new MemoryStream();
// ASN1_SEQUENCE(EC_PRIVATEKEY) = {
// ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
// ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
// ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
// ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
// } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
DerSequenceGenerator seq = new DerSequenceGenerator(baos);
seq.AddObject(new DerInteger(1)); // version
seq.AddObject(new DerOctetString(PrivateKey.D.ToByteArrayUnsigned()));
//Did not managed to generate the same der as brainwallet by using this
//seq.AddObject(new DerTaggedObject(0, Secp256k1.ToAsn1Object()));
Asn1Object secp256k1Der = null;
if(compressed)
{
secp256k1Der = DerSequence.FromByteArray(DataEncoders.Encoders.Hex.DecodeData("308182020101302c06072a8648ce3d0101022100fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f300604010004010704210279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798022100fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141020101"));
}
else
{
secp256k1Der = DerSequence.FromByteArray(DataEncoders.Encoders.Hex.DecodeData("3081a2020101302c06072a8648ce3d0101022100fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f300604010004010704410479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8022100fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141020101"));
}
seq.AddObject(new DerTaggedObject(0, secp256k1Der));
seq.AddObject(new DerTaggedObject(1, new DerBitString(GetPubKey(compressed).ToBytes())));
seq.Close();
return baos.ToArray();
}