Use EqualIgnoringAsciiCase() in LookupAlgorithmIdByName()

The "Normalizing an algorithm" algorithm[1] says that names should be
matched ASCII case-insensitive [2]. Currently the lookup sort of does
that, but the verifying comparison still uses a full Unicode
case-folding comparison. Because of how the lookup is structured the
lookup for some algorithm names could still accept non-ASCII.

Replace the final DeprecatedEqualIgnoringCase() comparison with
EqualIgnoringAsciiCase().

[1] https://w3c.github.io/webcrypto/#algorithm-normalization-normalize-an-algorithm
[2] https://w3c.github.io/webcrypto/#case-insensitive

Bug: 40476285
Change-Id: If1ee6a3c1e75f271c171b44f8de31fe688546b0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7633022
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/main@{#1594550}

Author: Fredrik Söderquist

WebCryptoAPI/normalize-algorithm-name.https.any.js

@@ -0,0 +1,52 @@
+// META: title=WebCryptoAPI: Algorithm normalization matches names ASCII case-insensitively
+// U+212A is the Kelvin Sign
+
+function makeSalt() {
+  return crypto.getRandomValues(new Uint8Array(32));
+}
+
+async function makeKey(algorithm) {
+  const keyData = new Uint8Array([]);
+  return crypto.subtle.importKey("raw", keyData, algorithm, false, ["deriveBits"]);
+}
+
+promise_test(async (t) => {
+  const algorithm = {
+    name: "H\u212ADF",
+    hash: "SHA-256",
+    salt: makeSalt(),
+    info: new TextEncoder().encode(''),
+  };
+  const key = await makeKey("HKDF");
+  const p = crypto.subtle.deriveBits(algorithm, key, 256);
+  return promise_rejects_dom(t, "NotSupportedError", p, algorithm.name);
+}, `"H<U+212A>DF" does not match "HKDF"`);
+
+promise_test(async (t) => {
+  const algorithm = {
+    name: "PB\u212ADF2",
+    hash: "SHA-256",
+    iterations: 1,
+    salt: makeSalt(),
+  };
+  const key = await makeKey("PBKDF2");
+  const p = crypto.subtle.deriveBits(algorithm, key, 256);
+  return promise_rejects_dom(t, "NotSupportedError", p, algorithm.name);
+}, `"PB<U+212A>DF2" does not match "PBKDF2"`);
+
+promise_test(async (t) => {
+  const algorithm = {name: "AES-\u212AW", length: 256};
+  const p = crypto.subtle.generateKey(algorithm, false, ["wrapKey"]);
+  return promise_rejects_dom(t, "NotSupportedError", p, algorithm.name);
+}, `"AES-<U+212A>W" does not match "AES-KW"`);
+
+promise_test(async (t) => {
+  const algorithm = {
+    name: "RSASSA-P\u212ACS1-V1_5",
+    modulusLength: 2048,
+    publicExponent: new Uint8Array([3]),
+    hash: "SHA-256",
+  };
+  const p = crypto.subtle.generateKey(algorithm, false, ["sign"]);
+  return promise_rejects_dom(t, "NotSupportedError", p, algorithm.name);
+}, `"RSASSA-P<U+212A>CS1-V1_5" does not match "RSASSA-PKCS1-V1_5"`);