Add AES-256-GCM key template with raw output prefix.

PiperOrigin-RevId: 262647886

javascript/aead/aead_key_templates.js

@@ -83,22 +83,42 @@ class AeadKeyTemplates {
    * Returns a KeyTemplate that generates new instances of AesGcmKey
    * with the following parameters:
    *    key size: 16 bytes
+   *    OutputPrefixType: TINK
    *
    * @return {!PbKeyTemplate}
    */
   static aes128Gcm() {
-    return AeadKeyTemplates.newAesGcmKeyTemplate_(/* keySize = */ 16);
+    return AeadKeyTemplates.newAesGcmKeyTemplate_(
+        /* keySize = */ 16,
+        /* outputPrefixType = */ PbOutputPrefixType.TINK);
   }
 
   /**
    * Returns a KeyTemplate that generates new instances of AesGcmKey
    * with the following parameters:
    *    key size: 32 bytes
+   *    OutputPrefixType: TINK
    *
    * @return {!PbKeyTemplate}
    */
   static aes256Gcm() {
-    return AeadKeyTemplates.newAesGcmKeyTemplate_(/* keySize = */ 32);
+    return AeadKeyTemplates.newAesGcmKeyTemplate_(
+        /* keySize = */ 32,
+        /* outputPrefixType = */ PbOutputPrefixType.TINK);
+  }
+
+  /**
+   * Returns a KeyTemplate that generates new instances of AesGcmKey
+   * with the following parameters:
+   *     key size: 32 bytes
+   *     OutputPrefixType: RAW
+   *
+   * @return {!PbKeyTemplate}
+   */
+  static aes256GcmNoPrefix() {
+    return AeadKeyTemplates.newAesGcmKeyTemplate_(
+        /* keySize = */ 32,
+        /* outputPrefixType = */ PbOutputPrefixType.RAW);
   }
 
   /**
@@ -144,17 +164,18 @@ class AeadKeyTemplates {
    * @private
    *
    * @param {number} keySize
+   * @param {!PbOutputPrefixType} outputPrefixType
    *
    * @return {!PbKeyTemplate}
    */
-  static newAesGcmKeyTemplate_(keySize) {
+  static newAesGcmKeyTemplate_(keySize, outputPrefixType) {
     // Define AES GCM key format.
     const keyFormat = new PbAesGcmKeyFormat().setKeySize(keySize);
 
     // Define key template.
     const keyTemplate = new PbKeyTemplate()
                             .setTypeUrl(AeadConfig.AES_GCM_TYPE_URL)
-                            .setOutputPrefixType(PbOutputPrefixType.TINK)
+                            .setOutputPrefixType(outputPrefixType)
                             .setValue(keyFormat.serializeBinary());
 
     return keyTemplate;

javascript/aead/aead_key_templates_test.js

@@ -144,4 +144,26 @@ testSuite({
     // Test that the template works with AesCtrHmacAeadKeyManager.
     manager.getKeyFactory().newKey(keyTemplate.getValue_asU8());
   },
+
+  testAes256GcmNoPrefix() {
+    // The created key should have the following parameters.
+    const expectedKeySize = 32;
+    const expectedOutputPrefix = PbOutputPrefixType.RAW;
+    // Expected type URL is the one supported by AesGcmKeyManager.
+    const manager = new AesGcmKeyManager();
+    const expectedTypeUrl = manager.getKeyType();
+
+    const keyTemplate = AeadKeyTemplates.aes256GcmNoPrefix();
+
+    assertEquals(expectedTypeUrl, keyTemplate.getTypeUrl());
+    assertEquals(expectedOutputPrefix, keyTemplate.getOutputPrefixType());
+
+    // Test key size value in key format.
+    const keyFormat =
+        PbAesGcmKeyFormat.deserializeBinary(keyTemplate.getValue_asU8());
+    assertEquals(expectedKeySize, keyFormat.getKeySize());
+
+    // Test that the template works with AesCtrHmacAeadKeyManager.
+    manager.getKeyFactory().newKey(keyTemplate.getValue_asU8());
+  }
 });