urbit-ob

commit 94a842d7eaddb56b3085792dbcd9d4a65da717db
parent cc32174f7226a7377a7a16025487316f735c4229
Author: Jared Tobin <jared@jtobin.io>
Date:   Mon, 18 Mar 2019 10:07:29 +1300

Remove deprecated ob code.

Replaces deprecated obfuscation functions (e.g. 'fice', 'teil', etc.)
with corrected versions ('feis', 'tail').

Diffstat:
M
src/internal/ob.js
 | 
115
-------------------------------------------------------------------------------

1 file changed, 0 insertions(+), 115 deletions(-)
diff --git a/src/internal/ob.js b/src/internal/ob.js
@@ -69,48 +69,6 @@ const fynd = (arg) => {
 }
 
 /**
- * Conceal structure v2.
- *
- * @param  {String, Number, BN}  pyn
- * @return  {BN}
- */
-const feen = (arg) => {
-  const loop = (pyn) => {
-    const lo = pyn.and(ux_ffff_ffff)
-    const hi = pyn.and(ux_ffff_ffff_0000_0000)
-
-    return pyn.gte(ux_1_0000) && pyn.lte(ux_ffff_ffff)
-      ? ux_1_0000.add(fice(pyn.sub(ux_1_0000)))
-      : pyn.gte(ux_1_0000_0000) && pyn.lte(ux_ffff_ffff_ffff_ffff)
-      ? hi.or(loop(lo))
-      : pyn
-  }
-
-  return loop(new BN(arg))
-}
-
-/**
- * Restore structure v2.
- *
- * @param  {String, Number, BN}  pyn
- * @return  {BN}
- */
-const fend = (arg) => {
-  const loop = (cry) => {
-    const lo = cry.and(ux_ffff_ffff)
-    const hi = cry.and(ux_ffff_ffff_0000_0000)
-
-    return cry.gte(ux_1_0000) && cry.lte(ux_ffff_ffff)
-      ? ux_1_0000.add(teil(cry.sub(ux_1_0000)))
-      : cry.gte(ux_1_0000_0000) && cry.lte(ux_ffff_ffff_ffff_ffff)
-      ? hi.or(loop(lo))
-      : cry
-  }
-
-  return loop(new BN(arg))
-}
-
-/**
  * Generalised Feistel cipher.
  *
  * See: Black and Rogaway (2002), "Ciphers with arbitrary finite domains."
@@ -162,25 +120,6 @@ const fe = (r, a, b, f, m) => {
 }
 
 /**
- * Adapted from Black and Rogaway "Ciphers with arbitrary finite domains",
- * 2002.
- *
- * @param  {String, Number, BN}
- * @return  {BN}
- */
-const fice = (arg) => {
-  const nor = new BN(arg)
-
-  const sel =
-    rynd(3,
-    rynd(2,
-    rynd(1,
-    rynd(0, [ nor.mod(u_65535), nor.div(u_65535) ]))))
-
-  return (u_65535.mul(sel[0])).add(sel[1])
-}
-
-/**
  * Reverse 'feis'.
  *
  * See: Black and Rogaway (2002), "Ciphers with arbitrary finite domains."
@@ -248,60 +187,7 @@ const fen = (r, a, b, f, m) => {
   return loop(r, L, R)
 }
 
-/**
- * Reverse fice.
- *
- * @param  {String}  vip
- * @return  {BN}
- */
-const teil = (arg) => {
-  const vip = new BN(arg)
-
-  const sel =
-    rund(0,
-    rund(1,
-    rund(2,
-    rund(3, [ vip.mod(u_65535), vip.div(u_65535) ]))))
-
-  return (u_65535.mul(sel[0])).add(sel[1])
-}
-
-/**
- * Feistel round.
- *
- * @param  {Number}  n
- * @param  {Array<BN>}  [l, r]
- * @return  {Array<BN>}
- */
-const rynd = (n, arr) => {
-  const l = arr[0]
-  const r = arr[1]
-  const p = n % 2 === 0 ? u_65535 : u_65536
-  return [ r, l.add(muk(raku[n], 2, r)).mod(p) ]
-}
-
-/**
- * Reverse round.
- *
- * @param  {Number}  n
- * @param  {Array<BN>}  [l, r]
- * @return  {Array<BN>}
- */
-const rund = (n, arr) => {
-  const l = arr[0]
-  const r = arr[1]
-  const p = n % 2 === 0 ? u_65535 : u_65536
-  return [ r, l.add(p).sub(muk(raku[n], 2, r).mod(p)).mod(p) ]
-}
-
 module.exports = {
-  feen,
-  fend,
-  fice,
-  teil,
-  rynd,
-  rund,
-
   F,
   raku,
 
@@ -314,5 +200,4 @@ module.exports = {
   Fen,
   tail,
   fynd
-
 }