private void x9_62_test_internal(Asn1Object obj, string r_in, string s_in) {
byte[] message = Encoding.ASCII.GetBytes("abc");
using(MessageDigestContext md_ctx = new MessageDigestContext(MessageDigest.ECDSA)) {
byte[] digest = md_ctx.Digest(message);
Console.Write("testing {0}: ", obj.ShortName);
using(Key key = Key.FromCurveName(obj)) {
key.GenerateKey();
Console.Write(".");
using(DSASignature signature = key.Sign(digest)) {
Console.Write(".");
BigNumber r = BigNumber.FromDecimalString(r_in);
BigNumber s = BigNumber.FromDecimalString(s_in);
Assert.AreEqual(r, signature.R);
Assert.AreEqual(s, signature.S);
Console.Write(".");
Assert.IsTrue(key.Verify(digest, signature));
Console.Write(".");
}
}
}
Console.WriteLine(" ok");
}
private void test_ecdh_curve(Asn1Object obj, string text, BigNumber.Context ctx) {
Key a = Key.FromCurveName(obj);
Key b = Key.FromCurveName(obj);
BigNumber x_a = new BigNumber();
BigNumber y_a = new BigNumber();
BigNumber x_b = new BigNumber();
BigNumber y_b = new BigNumber();
try {
Console.Write("Testing key generation with {0}", text);
a.GenerateKey();
if (a.Group.Method.FieldType == Objects.NID.X9_62_prime_field.NID) {
a.PublicKey.GetAffineCoordinatesGFp(x_a, y_a, ctx);
}
else {
a.PublicKey.GetAffineCoordinatesGF2m(x_a, y_a, ctx);
}
Console.Write(".");
b.GenerateKey();
if (b.Group.Method.FieldType == Objects.NID.X9_62_prime_field.NID) {
b.PublicKey.GetAffineCoordinatesGFp(x_b, y_b, ctx);
}
else {
b.PublicKey.GetAffineCoordinatesGF2m(x_b, y_b, ctx);
}
Console.Write(".");
byte[] abuf = new byte[MessageDigest.SHA1.Size];
int aout = a.ComputeKey(b, abuf, KDF1_SHA1);
Console.Write(".");
byte[] bbuf = new byte[MessageDigest.SHA1.Size];
int bout = b.ComputeKey(a, bbuf, KDF1_SHA1);
Console.Write(".");
Assert.Greater(aout, 4);
Assert.AreEqual(aout, bout);
Assert.IsTrue(Compare(abuf, bbuf));
Console.Write(" ok");
}
finally {
a.Dispose();
b.Dispose();
x_a.Dispose();
y_a.Dispose();
x_b.Dispose();
y_b.Dispose();
}
Console.WriteLine();
}
/// <summary>
/// Calls EC_KEY_new_by_curve_name()
/// </summary>
/// <returns>The curve name.</returns>
/// <param name="obj">Object.</param>
public static Key FromCurveName(Asn1Object obj)
{
return new Key(Native.ExpectNonNull(Native.EC_KEY_new_by_curve_name(obj.NID)), true);
}
private BuiltinCurve(int nid, string comment) {
this.obj = new Asn1Object(nid);
this.comment = comment;
}
public static Group FromCurveName(Asn1Object obj) {
return new Group(Native.ExpectNonNull(Native.EC_GROUP_new_by_curve_name(obj.NID)), true);
}