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app/src/main/java/i2p/bote/crypto/ECUtils.java

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+package i2p.bote.crypto;
+
+import org.spongycastle.asn1.nist.NISTNamedCurves;
+import org.spongycastle.asn1.x9.X9ECParameters;
+import org.spongycastle.jcajce.provider.asymmetric.util.EC5Util;
+import org.spongycastle.jce.ECPointUtil;
+import org.spongycastle.jce.spec.ECNamedCurveSpec;
+
+import java.security.spec.ECParameterSpec;
+import java.security.spec.ECPoint;
+import java.security.spec.EllipticCurve;
+
+/**
+ * A wrapper around the SpongyCastle EC classes.
+ */
+public class ECUtils {
+    public static ECParameterSpec getParameters(String curveName) {
+        X9ECParameters params = NISTNamedCurves.getByName(curveName);
+        return new ECNamedCurveSpec(curveName, params.getCurve(), params.getG(), params.getN(), params.getH(), null);
+    }
+
+    public static byte[] encodePoint(
+            ECParameterSpec ecSpec,
+            ECPoint point,
+            boolean withCompression) {
+        org.spongycastle.math.ec.ECPoint bcPoint = EC5Util.convertPoint(ecSpec, point, withCompression);
+        return bcPoint.getEncoded();
+    }
+
+    public static ECPoint decodePoint(
+            EllipticCurve curve,
+            byte[] encoded) {
+        return ECPointUtil.decodePoint(curve, encoded);
+    }
+}