1 files changed, 108 insertions, 0 deletions
diff --git a/comm/mail/extensions/openpgp/content/modules/zbase32.jsm b/comm/mail/extensions/openpgp/content/modules/zbase32.jsm
new file mode 100644
index 0000000000..c5587fde3f
--- /dev/null
+++ b/comm/mail/extensions/openpgp/content/modules/zbase32.jsm
@@ -0,0 +1,108 @@
+/* eslint no-invalid-this: 0 */
+/*
+ * 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 = ["EnigmailZBase32"];
+
+const ZBase32Alphabet = "ybndrfg8ejkmcpqxot1uwisza345h769";
+
+var EnigmailZBase32 = {
+  a: ZBase32Alphabet,
+  pad: "=",
+
+  /**
+   * Encode a string in Z-Base-32 encoding
+   *
+   * @param str   String - input string
+   *
+   * @returns String - econded string
+   */
+  encode(str) {
+    let a = this.a;
+    let pad = this.pad;
+    let len = str.length;
+    let o = "";
+    let w,
+      c,
+      r = 0,
+      sh = 0;
+
+    for (let i = 0; i < len; i += 5) {
+      // mask top 5 bits
+      c = str.charCodeAt(i);
+      w = 0xf8 & c;
+      o += a.charAt(w >> 3);
+      r = 0x07 & c;
+      sh = 2;
+
+      if (i + 1 < len) {
+        c = str.charCodeAt(i + 1);
+        // mask top 2 bits
+        w = 0xc0 & c;
+        o += a.charAt((r << 2) + (w >> 6));
+        o += a.charAt((0x3e & c) >> 1);
+        r = c & 0x01;
+        sh = 4;
+      }
+
+      if (i + 2 < len) {
+        c = str.charCodeAt(i + 2);
+        // mask top 4 bits
+        w = 0xf0 & c;
+        o += a.charAt((r << 4) + (w >> 4));
+        r = 0x0f & c;
+        sh = 1;
+      }
+
+      if (i + 3 < len) {
+        c = str.charCodeAt(i + 3);
+        // mask top 1 bit
+        w = 0x80 & c;
+        o += a.charAt((r << 1) + (w >> 7));
+        o += a.charAt((0x7c & c) >> 2);
+        r = 0x03 & c;
+        sh = 3;
+      }
+
+      if (i + 4 < len) {
+        c = str.charCodeAt(i + 4);
+        // mask top 3 bits
+        w = 0xe0 & c;
+        o += a.charAt((r << 3) + (w >> 5));
+        o += a.charAt(0x1f & c);
+        r = 0;
+        sh = 0;
+      }
+    }
+    // Calculate length of pad by getting the
+    // number of words to reach an 8th octet.
+    if (r != 0) {
+      o += a.charAt(r << sh);
+    }
+    var padlen = 8 - (o.length % 8);
+
+    if (padlen === 8) {
+      return o;
+    }
+
+    if (padlen === 1 || padlen === 3 || padlen === 4 || padlen === 6) {
+      return o + pad.repeat(padlen);
+    }
+
+    throw new Error(
+      "there was some kind of error:\npadlen:" +
+        padlen +
+        " ,r:" +
+        r +
+        " ,sh:" +
+        sh +
+        ", w:" +
+        w
+    );
+  },
+};