diff --git a/Ascon.cry b/Ascon.cry
index 6bf463d..103b30b 100644
--- a/Ascon.cry
+++ b/Ascon.cry
@@ -1,6 +1,7 @@
 /** Ascon-Based Lightweight Cryptography
  *
- * Author: Eric Mertens
+ * Author: Eric Mertens <emertens@gmail.com>
+ * License: ISC
  *
  * Key algorithms:
  * - AEAD128_encrypt/decrypt: Authenticated encryption
@@ -30,7 +31,7 @@ private
    * block is empty (i.e., |𝑋̃ℓ| = 0).
    */
   parse : {r, m} (fin m, fin r, r >= 1) => [m] -> ([m / r][r], [m % r])
-  parse (M_ # Ml) = (split M_, Ml)
+  parse (M # Ml) = (split M, Ml)
 
   /** Padding rule.
    *
@@ -48,9 +49,7 @@ private
    * of integers using Cryptol's native big-endian representation.
    */
   toBlocks : {r, m} (r >= 1, fin r, fin m) => [m] -> [m / r + 1][r]
-  toBlocks M = map reverse (M1 # [pad M2])
-    where
-      (M1, M2) = parse M
+  toBlocks M = bitsToWords (M # 0b1 # 0)
 
   // 3. Ascon Permutations
 
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..82fa9fd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,13 @@
+Copyright 2025 Eric Mertens
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *