public static ECKey FromDER(byte[] der)
{
// To understand this code, see the definition of the ASN.1 format for EC private keys in the OpenSSL source
// code in ec_asn1.c:
//
// 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)
//
Asn1InputStream decoder = new Asn1InputStream(der);
DerSequence seq = (DerSequence)decoder.ReadObject();
CheckArgument(seq.Count == 4, "Input does not appear to be an ASN.1 OpenSSL EC private key");
CheckArgument(((DerInteger)seq[0]).Value.Equals(BigInteger.One),
"Input is of wrong version");
byte[] bits = ((DerOctetString)seq[1]).GetOctets();
#if !PORTABLE
decoder.Close();
#else
decoder.Dispose();
#endif
return(new ECKey(bits, true));
}
public static void Main(string[] args)
{
FileStream fIn = File.OpenRead(args[0]);
Asn1InputStream bIn = new Asn1InputStream(fIn);
Asn1Object obj;
while ((obj = bIn.ReadObject()) != null)
{
Console.WriteLine(Asn1Dump.DumpAsString(obj));
}
bIn.Dispose();
}
public static ECSignature GenerateSignature(Hash data, ECKeyPair keyPair)
{
#if NATIVE_ECDSA
using (var eC = ECDsa.Create(keyPair))
{
Hash sign = eC.SignHash(data);
return(new ECSignature(sign));
}
#else
try
{
ISigner signer = SignerUtilities.GetSigner("NONEwithECDSA");
X9ECParameters curve = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName(keyPair.CurveType.ToString().ToLower());
ECDomainParameters domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
Org.BouncyCastle.Math.BigInteger bn = new Org.BouncyCastle.Math.BigInteger(keyPair.D);
ECPrivateKeyParameters parameters = new ECPrivateKeyParameters(bn, domain);
signer.Init(true, parameters);
signer.BlockUpdate(data, 0, data.Length);
byte[] sigBytes = signer.GenerateSignature();
Asn1InputStream decoder = new Asn1InputStream(sigBytes);
DerSequence seq = (DerSequence)decoder.ReadObject();
DerInteger r = (DerInteger)seq[0];
DerInteger s = (DerInteger)seq[1];
decoder.Dispose();
var rArr = r.Value.ToByteArray();
var sArr = s.Value.ToByteArray();
if (rArr[0] == 0)
{
rArr = rArr.Skip(1).ToArray();
}
if (sArr[0] == 0)
{
sArr = sArr.Skip(1).ToArray();
}
return(new ECSignature
{
R = r.Value.ToByteArray(),
S = s.Value.ToByteArray(),
SigCompat = sigBytes
});
}
catch (Exception e)
{
return(new ECSignature());
}
#endif
}
public static string DumpDer(byte[] der)
{
StringBuilder builder = new StringBuilder();
Asn1InputStream decoder = new Asn1InputStream(der);
DerSequence seq = (DerSequence)decoder.ReadObject();
builder.AppendLine("Version : " + Encoders.Hex.EncodeData(seq[0].GetDerEncoded()));
builder.AppendLine("Private : " + Encoders.Hex.EncodeData(seq[1].GetDerEncoded()));
builder.AppendLine("Params : " + Encoders.Hex.EncodeData(((DerTaggedObject)seq[2]).GetObject().GetDerEncoded()));
builder.AppendLine("Public : " + Encoders.Hex.EncodeData(seq[3].GetDerEncoded()));
#if !PORTABLE
decoder.Close();
#else
decoder.Dispose();
#endif
return(builder.ToString());
}
