public static Signature DecodeSignature(RlpStream rlpStream)
{
ReadOnlySpan <byte> vBytes = rlpStream.DecodeByteArraySpan();
ReadOnlySpan <byte> rBytes = rlpStream.DecodeByteArraySpan();
ReadOnlySpan <byte> sBytes = rlpStream.DecodeByteArraySpan();
if (vBytes[0] == 0 || rBytes[0] == 0 || sBytes[0] == 0)
{
throw new RlpException("VRS starting with 0");
}
if (rBytes.Length > 32 || sBytes.Length > 32)
{
throw new RlpException("R and S lengths expected to be less or equal 32");
}
ulong v = vBytes.ReadEthUInt64();
if (rBytes.SequenceEqual(Bytes.Zero32) && sBytes.SequenceEqual(Bytes.Zero32))
{
throw new RlpException("Both 'r' and 's' are zero when decoding a transaction.");
}
Signature signature = new Signature(rBytes, sBytes, v);
return(signature);
}
public Transaction Decode(RlpStream rlpStream, RlpBehaviors rlpBehaviors = RlpBehaviors.None)
{
if (rlpStream.IsNextItemNull())
{
rlpStream.ReadByte();
return(null);
}
var transactionSequence = rlpStream.PeekNextItem();
int transactionLength = rlpStream.ReadSequenceLength();
int lastCheck = rlpStream.Position + transactionLength;
Transaction transaction = new Transaction();
transaction.Nonce = rlpStream.DecodeUInt256();
transaction.GasPrice = rlpStream.DecodeUInt256();
transaction.GasLimit = rlpStream.DecodeLong();
transaction.To = rlpStream.DecodeAddress();
transaction.Value = rlpStream.DecodeUInt256();
if (transaction.To == null)
{
transaction.Init = rlpStream.DecodeByteArray();
}
else
{
transaction.Data = rlpStream.DecodeByteArray();
}
if (rlpStream.Position < lastCheck)
{
ReadOnlySpan <byte> vBytes = rlpStream.DecodeByteArraySpan();
ReadOnlySpan <byte> rBytes = rlpStream.DecodeByteArraySpan();
ReadOnlySpan <byte> sBytes = rlpStream.DecodeByteArraySpan();
bool allowUnsigned = (rlpBehaviors & RlpBehaviors.AllowUnsigned) == RlpBehaviors.AllowUnsigned;
bool isSignatureOk = true;
string signatureError = null;
if (vBytes == null || rBytes == null || sBytes == null)
{
isSignatureOk = false;
signatureError = "VRS null when decoding Transaction";
}
else if (vBytes.Length == 0 || rBytes.Length == 0 || sBytes.Length == 0)
{
isSignatureOk = false;
signatureError = "VRS is 0 length when decoding Transaction";
}
else if (vBytes[0] == 0 || rBytes[0] == 0 || sBytes[0] == 0)
{
isSignatureOk = false;
signatureError = "VRS starting with 0";
}
else if (rBytes.Length > 32 || sBytes.Length > 32)
{
isSignatureOk = false;
signatureError = "R and S lengths expected to be less or equal 32";
}
else if (rBytes.SequenceEqual(Bytes.Zero32) && sBytes.SequenceEqual(Bytes.Zero32))
{
isSignatureOk = false;
signatureError = "Both 'r' and 's' are zero when decoding a transaction.";
}
if (isSignatureOk)
{
int v = vBytes.ReadEthInt32();
Signature signature = new Signature(rBytes, sBytes, v);
transaction.Signature = signature;
transaction.Hash = Keccak.Compute(transactionSequence);
}
else
{
if (!allowUnsigned)
{
throw new RlpException(signatureError);
}
}
}
if ((rlpBehaviors & RlpBehaviors.AllowExtraData) != RlpBehaviors.AllowExtraData)
{
rlpStream.Check(lastCheck);
}
return(transaction);
}