Revert "remove unsused classes"

This reverts commit 272b307.

Author: alfonsobries

src/main/java/org/arkecosystem/crypto/signature/bls/PrivateKey.java

@@ -0,0 +1,64 @@
+package org.arkecosystem.crypto.signature.bls;
+
+// import org.sun.org.apache.xerces.internal.impl.dv.util.HexBin;
+
+import com.herumi.mcl.Fr;
+import com.herumi.mcl.G1;
+import com.herumi.mcl.G2;
+import com.herumi.mcl.Mcl;
+
+public class PrivateKey implements java.security.PrivateKey {
+    private int curveType;
+    private byte[] secKey;
+
+    @Override
+    public String getAlgorithm() {
+        if (curveType == Bls.BLS12_381) {
+            return "BLS12-381";
+        } else {
+            return "NOT SUPPORTED";
+        }
+    }
+
+    @Override
+    public String getFormat() {
+        return null;
+    }
+
+    @Override
+    public byte[] getEncoded() {
+        return secKey;
+    }
+
+    public PrivateKey(int curveType) {
+        this.curveType = curveType;
+        Fr fr = new Fr();
+        fr.setByCSPRNG();
+        secKey = fr.serialize();
+    }
+
+    public PublicKey getPublicKey() {
+        G1 Q = new G1();
+        Q.setStr(Bls.BaseG1);
+        G1 pub = new G1();
+        Fr fr = new Fr();
+        fr.deserialize(secKey);
+        Mcl.mul(pub, Q, fr);
+
+        PublicKey publicKey = new PublicKey(curveType, pub.serialize());
+        return publicKey;
+    }
+
+    /*
+     * Sign a message
+     */
+    public byte[] sign(byte[] msg) {
+        G2 H = new G2();
+        Mcl.hashAndMapToG2(H, msg); // H = Hash(m)
+        G2 sig = new G2();
+        Fr fr = new Fr();
+        fr.deserialize(secKey);
+        Mcl.mul(sig, H, fr); // signature of m = s H
+        return sig.serialize();
+    }
+}

src/main/java/org/arkecosystem/crypto/signature/bls/PublicKey.java

@@ -0,0 +1,78 @@
+package org.arkecosystem.crypto.signature.bls;
+
+import com.herumi.mcl.G1;
+import com.herumi.mcl.G2;
+import com.herumi.mcl.GT;
+import com.herumi.mcl.Mcl;
+
+public class PublicKey implements java.security.PublicKey {
+    private int curveType;
+    private byte[] pubKey;
+
+    @Override
+    public String getAlgorithm() {
+        if (curveType == Bls.BLS12_381) {
+            return "BLS12-381";
+        } else {
+            return "NOT SUPPORTED";
+        }
+    }
+
+    @Override
+    public String getFormat() {
+        return null;
+    }
+
+    @Override
+    public byte[] getEncoded() {
+        return pubKey;
+    }
+
+    public PublicKey(int curveType, byte[] pubKey) {
+        this.curveType = curveType;
+        this.pubKey = pubKey;
+    }
+
+    /*
+     * Veryfi signature
+     * Case 1: single message and single signature
+     * Case 2: single message and multiple signatures
+     */
+    public boolean verify(byte[] msg, byte[] sig) {
+        G2 H = new G2();
+        Mcl.hashAndMapToG2(H, msg); // H = Hash(m)
+        G1 pub = new G1();
+        pub.deserialize(pubKey);
+        G1 Q = new G1();
+        Q.setStr(Bls.BaseG1);
+        G2 g2 = new G2();
+        g2.deserialize(sig);
+        GT e1 = new GT();
+        GT e2 = new GT();
+        Mcl.pairing(e1, pub, H); // e1 = e(H, s Q)
+        Mcl.pairing(e2, Q, g2); // e2 = e(s H, Q);
+        return e1.equals(e2);
+    }
+
+    /*
+     * Verify mutiple signatures
+     * Case: Single private key and multiple messages with multiple signatures
+     * h: Not the message itself, it's result of hashAndMapToG2
+     */
+    public boolean verifyAggregate(byte[] h, byte[] sig) {
+        G2 H = new G2();
+        H.deserialize(h); // H = Hash(m)
+        G1 pub = new G1();
+        pub.deserialize(pubKey);
+        G1 Q = new G1();
+        Q.setStr(Bls.BaseG1);
+
+        G2 g2 = new G2();
+        g2.deserialize(sig);
+        GT e1 = new GT();
+        GT e2 = new GT();
+        Mcl.pairing(e1, pub, H); // e1 = e(H, s Q)
+        Mcl.pairing(e2, Q, g2); // e2 = e(s H, Q);
+        return e1.equals(e2);
+    }
+}