add SchnorrUtil PsecretKeyToCurveScala

SecretKey(Ed25519) to Scalar(X25519)
bosagora · Dec 27, 2019 · 1279806 · 1279806
1 parent 5652d55
commit 1279806
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diff --git a/source/agora/common/crypto/ECC.d b/source/agora/common/crypto/ECC.d
@@ -17,6 +17,8 @@
 
 module agora.common.crypto.ECC;
 
+import agora.common.crypto.Key;
+import agora.common.crypto.Schnorr;
 import agora.common.Deserializer;
 import agora.common.Hash;
 import agora.common.Serializer;
@@ -340,3 +342,36 @@ unittest
     assert(points[0] == Point.fromString(
             "0x37e8a197247dd01cc27c178dc0465ce826b4f6e312f3ee4c1df0623ef38c51c5"));
 }
+
+/// SecretKey(Ed25519) to Scalar(X25519)
+public static Scalar secretKeyToCurveScalar (SecretKey secret) nothrow @nogc
+{
+    Scalar x25519_sk;
+    if (crypto_sign_ed25519_sk_to_curve25519(x25519_sk.data[].ptr, secret[].ptr) != 0)
+        assert(0);
+    return x25519_sk;
+}
+
+///
+unittest
+{
+    import agora.common.crypto.Schnorr;
+
+    KeyPair kp = KeyPair.fromSeed(
+        Seed.fromString(
+            "SCT4KKJNYLTQO4TVDPVJQZEONTVVW66YLRWAINWI3FZDY7U4JS4JJEI4"));
+
+    Scalar scalar = secretKeyToCurveScalar(kp.secret);
+    assert(scalar ==
+        Scalar(`0x44245dd23bd7453bf5fe07ec27a29be3dfe8e18d35bba28c7b222b71a4802db8`));
+
+    Pair pair;
+    pair.v = scalar;
+    pair.V = pair.v.toPoint();
+
+    assert(pair.V.data == kp.address.data);
+    Signature enroll_sig = sign(pair, "BOSAGORA");
+
+    Point point_Address = Point(kp.address);
+    assert(verify(point_Address, enroll_sig, "BOSAGORA"));
+}
diff --git a/source/agora/common/crypto/Schnorr.d b/source/agora/common/crypto/Schnorr.d
@@ -48,11 +48,11 @@ module agora.common.crypto.Schnorr;
 import agora.common.Types;
 import agora.common.Hash;
 import agora.common.crypto.ECC;
+import agora.common.crypto.Key;
 
 import std.algorithm;
 import std.range;
 
-
 /// Single signature example
 nothrow @nogc unittest
 {