Remove 32 byte epochId restriction in WASM

Note: this fixes two tests, that previously could not encode the
`epochId` in a format compatible with shutter optimism (which is
where the data in these tests came from).

Author: konradkonrad

js/shutter-crypto/test/test.js

@@ -20,9 +20,7 @@ describe("Test shutter crypto", () => {
     const hexString =
       "0b4e86e0ed51ef774210d1c0fe0be6f1b4f0695d5d396b3b003547f752ac82e316375aa37b1739c9c8472b1b5ae09477565bf9d2c0d7db0c39576f4615d32703262d5854bfbac8a60eb6d227f397289e6e51f979b56476b7f7f32a45ede7a61f21d893a54ab6e65b283342adc41d53df5432569c6a8c2304921bce3ea148efb4";
     const eonkey = Uint8Array.from(Buffer.from(hexString, "hex"));
-    const epochId = ethers.getBytes(
-      ethers.zeroPadValue(Buffer.from("46", "hex"), 32)
-    );
+    const epochId = new Uint8Array([70]);
 
     const sigma = new Uint8Array(32);
     crypto.getRandomValues(sigma);
@@ -34,6 +32,7 @@ describe("Test shutter crypto", () => {
     expect(encrypted).toBeDefined();
   });
   test("decrypt a message", async () => {
+    expect(encrypted).toBeDefined();
     const decryptionKey = Uint8Array.from(
       Buffer.from(
         "009bb51574d6a6790faa4724dfad416ca059a286ccfee20be732cac9a81e05dc2f47905cbaa0fb043ff849b0c41e99208d98d27cba3fffb43d63ba50c35259d3",
@@ -52,9 +51,7 @@ describe("Test shutter crypto", () => {
 
 describe("Test known values (values obtained from 'rolling-shutter crypto encrypt/decrypt')", () => {
   test("encrypt a message with zero sigma", async () => {
-    const epochId = ethers.getBytes(
-      ethers.zeroPadValue(Buffer.from("46", "hex"), 32)
-    );
+    const epochId = new Uint8Array([70]);
     const eonKey = ethers.getBytes(
       Buffer.from(
         "0b4e86e0ed51ef774210d1c0fe0be6f1b4f0695d5d396b3b003547f752ac82e316375aa37b1739c9c8472b1b5ae09477565bf9d2c0d7db0c39576f4615d32703262d5854bfbac8a60eb6d227f397289e6e51f979b56476b7f7f32a45ede7a61f21d893a54ab6e65b283342adc41d53df5432569c6a8c2304921bce3ea148efb4",

rolling-shutter/shcryptowasm/shutter_crypto_wasm.go

@@ -147,9 +147,6 @@ func decodeEpochIDArgBytes(arg js.Value) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	if len(b) != 32 {
-		return nil, fmt.Errorf("sigma must be 32 bytes, got %d", len(b))
-	}
 	return b, nil
 }