[refactor] Split wrap-unwrap.html into smaller files, and directly check the error result.

LayoutTests/crypto/unwrapKey-lacks-usage.html

Index: LayoutTests/crypto/unwrapKey-lacks-usage.html
diff --git a/LayoutTests/crypto/aes-key-algorithm-mismatch.html b/LayoutTests/crypto/unwrapKey-lacks-usage.html
similarity index 35%
copy from LayoutTests/crypto/aes-key-algorithm-mismatch.html
copy to LayoutTests/crypto/unwrapKey-lacks-usage.html
index 9d97be3c1f1b0cac349a5e49617c9a8269fbc064..b79b80cc192b16bd4ab6613b3f745f8ada481152 100644
--- a/LayoutTests/crypto/aes-key-algorithm-mismatch.html
+++ b/LayoutTests/crypto/unwrapKey-lacks-usage.html
@@ -9,26 +9,28 @@
 <div id="console"></div>
 
 <script>
-description("Call encrypt using the wrong AES key");
+description("Tests that unwrapping keys must have the 'unwrapKey' usage.");
 
 jsTestIsAsync = true;
 
-var keyData = hexStringToUint8Array("2b7e151628aed2a6abf7158809cf4f3c");
-var data = asciiToUint8Array("hello");
-var aesCbcKey = null;
+function importUnwrappingKey()
+{
+    var data = new Uint8Array(16);
+    var extractable = true;
+    var keyUsages = ['decrypt'];
 
-Promise.resolve(null).then(function(result) {
-    var usages = ['encrypt', 'decrypt'];
-    var extractable = false;
-    var algorithm = {name: 'aes-gcm'};
+    return crypto.subtle.importKey('raw', data, {name: 'AES-CBC'}, extractable, keyUsages);
+}
 
-    return crypto.subtle.importKey('raw', keyData, algorithm, extractable, usages);
-}).then(function(result) {
-    key = result;
-    shouldEvaluateAs("key.algorithm.name", "AES-GCM");
+importUnwrappingKey().then(function(result) {
+    wrappedKey = new Uint8Array(100);
+    unwrappingKey = result;
+    unwrapAlgorithm = {name: 'aes-cbc', iv: new Uint8Array(16)};
+    unwrappedKeyAlgorithm = unwrapAlgorithm;
+    extractable = true;
+    keyUsages = ['encrypt'];
 
-    // Can't use an AES-KW key for AES-CBC (even though both are AES keys).
-    return crypto.subtle.encrypt({name: 'AES-CBC', iv: new Uint8Array(16)}, key, data);
+    return crypto.subtle.unwrapKey('raw', wrappedKey, unwrappingKey, unwrapAlgorithm, unwrappedKeyAlgorithm, extractable, keyUsages);
 }).then(failAndFinishJSTest, function(result) {
     error = result;
     shouldBeNull("error");