update Bit255

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@auxo-dev/auxo-libs",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "description": "",
   "author": "",
   "license": "Apache-2.0",

src/Bit255.test.ts

@@ -25,11 +25,11 @@ describe('CustomScalar', () => {
     expect(bitStringXor2.toBigInt()).toEqual(bigIntXor2);
   });
 
-  // FIXME - not working
-  xit('Should convert to bigint correctly', async () => {
-    // let r = Scalar.random();
-    let r = Scalar.from(1n);
+  // FIXME - not preserving Scalar's constant value
+  it('Should convert between bigint correctly', async () => {
+    let r = Scalar.random();
     let bitString = Bit255.fromScalar(r);
-    expect(bitString.toBigInt()).toEqual(r.toBigInt());
+    expect(Bit255.fromBigInt(r.toBigInt()).toBigInt()).toEqual(r.toBigInt());
+    expect(Bit255.fromBigInt(bitString.toBigInt())).toEqual(bitString);
   });
 });

src/Bit255.ts

@@ -35,6 +35,25 @@ export class Bit255 extends Struct({
     });
   }
 
+  static fromBits(bits: Bool[]): Bit255 {
+    if (bits.length !== 255) throw new Error('Invalid input length');
+    return new Bit255({
+      head: Field.fromBits(bits.slice(0, 127)),
+      tail: Field.fromBits(bits.slice(127)),
+    });
+  }
+
+  static fromBigInt(i: bigint): Bit255 {
+    let bits = new Array<Bool>(255).fill(Bool(false));
+    let index = 0;
+    while (i > 0) {
+      bits[index] = Bool(i % 2n == 1n);
+      i = i / 2n;
+      index += 1;
+    }
+    return Bit255.fromBits(bits);
+  }
+
   static toBigInt(b: Bit255): bigint {
     let bits = b.head
       .toBits()