src/main/java/com/amazonaws/encryptionsdk/kmssdkv2/AwsKmsMrkAwareMasterKeyProvider.java [424:456]:
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  static String getResourceForResourceTypeKey(String identifier) {
    final AwsKmsCmkArnInfo info = parseInfoFromKeyArn(identifier);
    /* Check for early return (Postcondition): Non-ARNs may be raw resources.
     * Raw aliases ('alias/my-key')
     * or key ids ('mrk-edb7fe6942894d32ac46dbb1c922d574').
     */
    if (info == null) return identifier;

    /* Check for early return (Postcondition): Return the identifier for non-key resource types.
     * I only care about duplicate multi-region *keys*.
     * Any other resource type
     * should get filtered out.
     * I return the entire identifier
     * on the off chance that
     * a customer has created
     * an alias with a name `mrk-*`.
     * This way such an alias
     * can never accidentally
     * collided with an existing multi-region key
     * or a duplicate alias.
     */
    if (!info.getResourceType().equals("key")) {
      return identifier;
    }

    /* Postcondition: Return the key id.
     * This will be used
     * to find different regional replicas of
     * the same multi-region key
     * because the key id for replicas is always the same.
     */
    return info.getResource();
  }
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src/main/java/com/amazonaws/encryptionsdk/kms/AwsKmsMrkAwareMasterKeyProvider.java [471:480]:
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  static String getResourceForResourceTypeKey(String identifier) {
    final AwsKmsCmkArnInfo info = parseInfoFromKeyArn(identifier);
    if (info == null) return identifier;

    if (!info.getResourceType().equals("key")) {
      return identifier;
    }

    return info.getResource();
  }
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