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diff --git a/comm/mail/extensions/openpgp/content/modules/trust.jsm b/comm/mail/extensions/openpgp/content/modules/trust.jsm
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+++ b/comm/mail/extensions/openpgp/content/modules/trust.jsm
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+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var EXPORTED_SYMBOLS = ["EnigmailTrust"];
+
+var l10n;
+
+// trust flags according to GPG documentation:
+// - https://www.gnupg.org/documentation/manuals/gnupg.pdf
+// - sources: doc/DETAILS
+// In the order of trustworthy:
+//  ---------------------------------------------------------
+//  i = The key is invalid (e.g. due to a missing self-signature)
+//  n = The key is not valid / Never trust this key
+//  d/D = The key has been disabled
+//  r = The key has been revoked
+//  e = The key has expired
+//  g = group (???)
+//  ---------------------------------------------------------
+//  ? = INTERNAL VALUE to separate invalid from unknown keys
+//  ---------------------------------------------------------
+//  o = Unknown (this key is new to the system)
+//  - = Unknown validity (i.e. no value assigned)
+//  q = Undefined validity (Not enough information for calculation)
+//      '-' and 'q' may safely be treated as the same value for most purposes
+//  ---------------------------------------------------------
+//  m = Marginally trusted
+//  ---------------------------------------------------------
+//  f = Fully trusted / valid key
+//  u = Ultimately trusted
+//  ---------------------------------------------------------
+const TRUSTLEVELS_SORTED = "indDreg?o-qmfu";
+const TRUSTLEVELS_SORTED_IDX_UNKNOWN = 7; // index of '?'
+
+var EnigmailTrust = {
+  /**
+   * @returns - |string| containing the order of trust/validity values
+   */
+  trustLevelsSorted() {
+    return TRUSTLEVELS_SORTED;
+  },
+
+  /**
+   * @returns - |boolean| whether the flag is invalid (neither unknown nor valid)
+   */
+  isInvalid(flag) {
+    return TRUSTLEVELS_SORTED.indexOf(flag) < TRUSTLEVELS_SORTED_IDX_UNKNOWN;
+  },
+
+  getTrustCode(keyObj) {
+    return keyObj.keyTrust;
+  },
+
+  getTrustLabel(trustCode) {
+    if (!l10n) {
+      l10n = new Localization(["messenger/openpgp/openpgp.ftl"], true);
+    }
+    let keyTrust;
+    switch (trustCode) {
+      case "q":
+        return l10n.formatValueSync("key-valid-unknown");
+      case "i":
+        return l10n.formatValueSync("key-valid-invalid");
+      case "d":
+      case "D":
+        return l10n.formatValueSync("key-valid-disabled");
+      case "r":
+        return l10n.formatValueSync("key-valid-revoked");
+      case "e":
+        return l10n.formatValueSync("key-valid-expired");
+      case "n":
+        return l10n.formatValueSync("key-trust-untrusted");
+      case "m":
+        return l10n.formatValueSync("key-trust-marginal");
+      case "f":
+        return l10n.formatValueSync("key-trust-full");
+      case "u":
+        return l10n.formatValueSync("key-trust-ultimate");
+      case "g":
+        return l10n.formatValueSync("key-trust-group");
+      case "-":
+        keyTrust = "-";
+        break;
+      default:
+        keyTrust = "";
+    }
+    return keyTrust;
+  },
+};