添加 EC-GDSA

ecgdsa/curves.go

@@ -0,0 +1,42 @@
+package ecgdsa
+
+import (
+    "encoding/asn1"
+    "crypto/elliptic"
+)
+
+type namedCurveInfo struct {
+    namedCurve elliptic.Curve
+    oid        asn1.ObjectIdentifier
+}
+
+var namedCurves = make([]namedCurveInfo, 0)
+
+func AddNamedCurve(curve elliptic.Curve, oid asn1.ObjectIdentifier)  {
+    namedCurves = append(namedCurves, namedCurveInfo{
+        namedCurve: curve,
+        oid:        oid,
+    })
+}
+
+func NamedCurveFromOid(oid asn1.ObjectIdentifier) elliptic.Curve {
+    for i := range namedCurves {
+        cur := &namedCurves[i]
+        if cur.oid.Equal(oid) {
+            return cur.namedCurve
+        }
+    }
+
+    return nil
+}
+
+func OidFromNamedCurve(curve elliptic.Curve) (asn1.ObjectIdentifier, bool) {
+    for i := range namedCurves {
+        cur := &namedCurves[i]
+        if cur.namedCurve == curve {
+            return cur.oid, true
+        }
+    }
+
+    return asn1.ObjectIdentifier{}, false
+}