test(crypto): improve test coverage

crypto/_fnv/mod_test.ts

@@ -0,0 +1,29 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals, assertThrows } from "../../assert/mod.ts";
+import { fnv } from "./mod.ts";
+
+Deno.test("fnv()", function () {
+  const encoder = new TextEncoder();
+  const input = encoder.encode("a");
+  const fixtures = [
+    ["FNV32", new ArrayBuffer(4)],
+    ["FNV32A", new ArrayBuffer(4)],
+    ["FNV64", new ArrayBuffer(8)],
+    ["FNV64A", new ArrayBuffer(8)],
+  ] as const;
+  for (const [name, expected] of fixtures) {
+    assertEquals(fnv(name, input), expected);
+  }
+});
+
+Deno.test("fnv() throws when no data is provided", function () {
+  assertThrows(() => fnv("FNV32"), TypeError, "no data provided for hashing");
+});
+
+Deno.test("fnv() throws when an unsupported digest is provided", function () {
+  assertThrows(
+    () => fnv("FNV128", new Uint8Array()),
+    TypeError,
+    "unsupported fnv digest: FNV128",
+  );
+});

crypto/crypto_test.ts

@@ -1,5 +1,11 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
-import { assert, assertEquals, assertInstanceOf, fail } from "../assert/mod.ts";
+import {
+  assert,
+  assertEquals,
+  assertInstanceOf,
+  assertRejects,
+  fail,
+} from "../assert/mod.ts";
 import {
   crypto as stdCrypto,
   DIGEST_ALGORITHM_NAMES,
@@ -260,6 +266,35 @@ Deno.test("digest() keeps memory usage reasonable with many calls", async () =>
   );
 });
 
+Deno.test("digest() throws on invalid input", async () => {
+  const inputString = "taking the hobbits to isengard";
+  const inputBytes = new TextEncoder().encode(inputString);
+
+  await assertRejects(
+    () => stdCrypto.subtle.digest("BLAKE2B", {} as Iterable<never>),
+    TypeError,
+    "data must be a BufferSource or [Async]Iterable<BufferSource>",
+  );
+
+  await assertRejects(
+    () =>
+      stdCrypto.subtle.digest(
+        "BLAKE2B",
+        (async function* () {
+          yield undefined;
+        })() as AsyncIterable<BufferSource>,
+      ),
+    TypeError,
+    "data contained chunk of the wrong type",
+  );
+
+  await assertRejects(
+    () => stdCrypto.subtle.digest("BLAK" as DigestAlgorithmName, inputBytes),
+    DOMException,
+    "Unrecognized algorithm name",
+  );
+});
+
 // Simple periodic data, but the periods shouldn't line up with any block
 // or chunk sizes.
 const aboutAMeg = repeat(

crypto/timing_safe_equal_test.ts

@@ -71,6 +71,26 @@ Deno.test({
   },
 });
 
+Deno.test({
+  name:
+    "timingSafeEqual() handles Uint8Array with different byte lengths (a > b)",
+  fn() {
+    const a = new Uint8Array([212, 213]);
+    const b = new Uint8Array([212]);
+    assert(!timingSafeEqual(a, b));
+  },
+});
+
+Deno.test({
+  name:
+    "timingSafeEqual() handles Uint8Array with different byte lengths (a < b)",
+  fn() {
+    const a = new Uint8Array([212]);
+    const b = new Uint8Array([212, 213]);
+    assert(!timingSafeEqual(a, b));
+  },
+});
+
 Deno.test({
   name:
     "timingSafeEqual() handles Uint8Array with different buffer sizes (a > b)",

crypto/unstable_keystack_test.ts

@@ -1,9 +1,20 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
-import { assert, assertEquals } from "../assert/mod.ts";
+import { assert, assertEquals, assertThrows } from "../assert/mod.ts";
 
 import { KeyStack } from "./unstable_keystack.ts";
 
+Deno.test({
+  name: "KeyStack() throws on empty keys",
+  fn() {
+    assertThrows(
+      () => new KeyStack([]),
+      TypeError,
+      "keys must contain at least one value",
+    );
+  },
+});
+
 Deno.test({
   name: "keyStack.sign() handles single key",
   async fn() {