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							- // based on the aes implimentation in triple sec
 
- // https://github.com/keybase/triplesec
 
- // which is in turn based on the one from crypto-js
 
- // https://code.google.com/p/crypto-js/
 
- var Buffer = require('safe-buffer').Buffer
 
- function asUInt32Array (buf) {
 
-   if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf)
 
-   var len = (buf.length / 4) | 0
 
-   var out = new Array(len)
 
-   for (var i = 0; i < len; i++) {
 
-     out[i] = buf.readUInt32BE(i * 4)
 
-   }
 
-   return out
 
- }
 
- function scrubVec (v) {
 
-   for (var i = 0; i < v.length; v++) {
 
-     v[i] = 0
 
-   }
 
- }
 
- function cryptBlock (M, keySchedule, SUB_MIX, SBOX, nRounds) {
 
-   var SUB_MIX0 = SUB_MIX[0]
 
-   var SUB_MIX1 = SUB_MIX[1]
 
-   var SUB_MIX2 = SUB_MIX[2]
 
-   var SUB_MIX3 = SUB_MIX[3]
 
-   var s0 = M[0] ^ keySchedule[0]
 
-   var s1 = M[1] ^ keySchedule[1]
 
-   var s2 = M[2] ^ keySchedule[2]
 
-   var s3 = M[3] ^ keySchedule[3]
 
-   var t0, t1, t2, t3
 
-   var ksRow = 4
 
-   for (var round = 1; round < nRounds; round++) {
 
-     t0 = SUB_MIX0[s0 >>> 24] ^ SUB_MIX1[(s1 >>> 16) & 0xff] ^ SUB_MIX2[(s2 >>> 8) & 0xff] ^ SUB_MIX3[s3 & 0xff] ^ keySchedule[ksRow++]
 
-     t1 = SUB_MIX0[s1 >>> 24] ^ SUB_MIX1[(s2 >>> 16) & 0xff] ^ SUB_MIX2[(s3 >>> 8) & 0xff] ^ SUB_MIX3[s0 & 0xff] ^ keySchedule[ksRow++]
 
-     t2 = SUB_MIX0[s2 >>> 24] ^ SUB_MIX1[(s3 >>> 16) & 0xff] ^ SUB_MIX2[(s0 >>> 8) & 0xff] ^ SUB_MIX3[s1 & 0xff] ^ keySchedule[ksRow++]
 
-     t3 = SUB_MIX0[s3 >>> 24] ^ SUB_MIX1[(s0 >>> 16) & 0xff] ^ SUB_MIX2[(s1 >>> 8) & 0xff] ^ SUB_MIX3[s2 & 0xff] ^ keySchedule[ksRow++]
 
-     s0 = t0
 
-     s1 = t1
 
-     s2 = t2
 
-     s3 = t3
 
-   }
 
-   t0 = ((SBOX[s0 >>> 24] << 24) | (SBOX[(s1 >>> 16) & 0xff] << 16) | (SBOX[(s2 >>> 8) & 0xff] << 8) | SBOX[s3 & 0xff]) ^ keySchedule[ksRow++]
 
-   t1 = ((SBOX[s1 >>> 24] << 24) | (SBOX[(s2 >>> 16) & 0xff] << 16) | (SBOX[(s3 >>> 8) & 0xff] << 8) | SBOX[s0 & 0xff]) ^ keySchedule[ksRow++]
 
-   t2 = ((SBOX[s2 >>> 24] << 24) | (SBOX[(s3 >>> 16) & 0xff] << 16) | (SBOX[(s0 >>> 8) & 0xff] << 8) | SBOX[s1 & 0xff]) ^ keySchedule[ksRow++]
 
-   t3 = ((SBOX[s3 >>> 24] << 24) | (SBOX[(s0 >>> 16) & 0xff] << 16) | (SBOX[(s1 >>> 8) & 0xff] << 8) | SBOX[s2 & 0xff]) ^ keySchedule[ksRow++]
 
-   t0 = t0 >>> 0
 
-   t1 = t1 >>> 0
 
-   t2 = t2 >>> 0
 
-   t3 = t3 >>> 0
 
-   return [t0, t1, t2, t3]
 
- }
 
- // AES constants
 
- var RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36]
 
- var G = (function () {
 
-   // Compute double table
 
-   var d = new Array(256)
 
-   for (var j = 0; j < 256; j++) {
 
-     if (j < 128) {
 
-       d[j] = j << 1
 
-     } else {
 
-       d[j] = (j << 1) ^ 0x11b
 
-     }
 
-   }
 
-   var SBOX = []
 
-   var INV_SBOX = []
 
-   var SUB_MIX = [[], [], [], []]
 
-   var INV_SUB_MIX = [[], [], [], []]
 
-   // Walk GF(2^8)
 
-   var x = 0
 
-   var xi = 0
 
-   for (var i = 0; i < 256; ++i) {
 
-     // Compute sbox
 
-     var sx = xi ^ (xi << 1) ^ (xi << 2) ^ (xi << 3) ^ (xi << 4)
 
-     sx = (sx >>> 8) ^ (sx & 0xff) ^ 0x63
 
-     SBOX[x] = sx
 
-     INV_SBOX[sx] = x
 
-     // Compute multiplication
 
-     var x2 = d[x]
 
-     var x4 = d[x2]
 
-     var x8 = d[x4]
 
-     // Compute sub bytes, mix columns tables
 
-     var t = (d[sx] * 0x101) ^ (sx * 0x1010100)
 
-     SUB_MIX[0][x] = (t << 24) | (t >>> 8)
 
-     SUB_MIX[1][x] = (t << 16) | (t >>> 16)
 
-     SUB_MIX[2][x] = (t << 8) | (t >>> 24)
 
-     SUB_MIX[3][x] = t
 
-     // Compute inv sub bytes, inv mix columns tables
 
-     t = (x8 * 0x1010101) ^ (x4 * 0x10001) ^ (x2 * 0x101) ^ (x * 0x1010100)
 
-     INV_SUB_MIX[0][sx] = (t << 24) | (t >>> 8)
 
-     INV_SUB_MIX[1][sx] = (t << 16) | (t >>> 16)
 
-     INV_SUB_MIX[2][sx] = (t << 8) | (t >>> 24)
 
-     INV_SUB_MIX[3][sx] = t
 
-     if (x === 0) {
 
-       x = xi = 1
 
-     } else {
 
-       x = x2 ^ d[d[d[x8 ^ x2]]]
 
-       xi ^= d[d[xi]]
 
-     }
 
-   }
 
-   return {
 
-     SBOX: SBOX,
 
-     INV_SBOX: INV_SBOX,
 
-     SUB_MIX: SUB_MIX,
 
-     INV_SUB_MIX: INV_SUB_MIX
 
-   }
 
- })()
 
- function AES (key) {
 
-   this._key = asUInt32Array(key)
 
-   this._reset()
 
- }
 
- AES.blockSize = 4 * 4
 
- AES.keySize = 256 / 8
 
- AES.prototype.blockSize = AES.blockSize
 
- AES.prototype.keySize = AES.keySize
 
- AES.prototype._reset = function () {
 
-   var keyWords = this._key
 
-   var keySize = keyWords.length
 
-   var nRounds = keySize + 6
 
-   var ksRows = (nRounds + 1) * 4
 
-   var keySchedule = []
 
-   for (var k = 0; k < keySize; k++) {
 
-     keySchedule[k] = keyWords[k]
 
-   }
 
-   for (k = keySize; k < ksRows; k++) {
 
-     var t = keySchedule[k - 1]
 
-     if (k % keySize === 0) {
 
-       t = (t << 8) | (t >>> 24)
 
-       t =
 
-         (G.SBOX[t >>> 24] << 24) |
 
-         (G.SBOX[(t >>> 16) & 0xff] << 16) |
 
-         (G.SBOX[(t >>> 8) & 0xff] << 8) |
 
-         (G.SBOX[t & 0xff])
 
-       t ^= RCON[(k / keySize) | 0] << 24
 
-     } else if (keySize > 6 && k % keySize === 4) {
 
-       t =
 
-         (G.SBOX[t >>> 24] << 24) |
 
-         (G.SBOX[(t >>> 16) & 0xff] << 16) |
 
-         (G.SBOX[(t >>> 8) & 0xff] << 8) |
 
-         (G.SBOX[t & 0xff])
 
-     }
 
-     keySchedule[k] = keySchedule[k - keySize] ^ t
 
-   }
 
-   var invKeySchedule = []
 
-   for (var ik = 0; ik < ksRows; ik++) {
 
-     var ksR = ksRows - ik
 
-     var tt = keySchedule[ksR - (ik % 4 ? 0 : 4)]
 
-     if (ik < 4 || ksR <= 4) {
 
-       invKeySchedule[ik] = tt
 
-     } else {
 
-       invKeySchedule[ik] =
 
-         G.INV_SUB_MIX[0][G.SBOX[tt >>> 24]] ^
 
-         G.INV_SUB_MIX[1][G.SBOX[(tt >>> 16) & 0xff]] ^
 
-         G.INV_SUB_MIX[2][G.SBOX[(tt >>> 8) & 0xff]] ^
 
-         G.INV_SUB_MIX[3][G.SBOX[tt & 0xff]]
 
-     }
 
-   }
 
-   this._nRounds = nRounds
 
-   this._keySchedule = keySchedule
 
-   this._invKeySchedule = invKeySchedule
 
- }
 
- AES.prototype.encryptBlockRaw = function (M) {
 
-   M = asUInt32Array(M)
 
-   return cryptBlock(M, this._keySchedule, G.SUB_MIX, G.SBOX, this._nRounds)
 
- }
 
- AES.prototype.encryptBlock = function (M) {
 
-   var out = this.encryptBlockRaw(M)
 
-   var buf = Buffer.allocUnsafe(16)
 
-   buf.writeUInt32BE(out[0], 0)
 
-   buf.writeUInt32BE(out[1], 4)
 
-   buf.writeUInt32BE(out[2], 8)
 
-   buf.writeUInt32BE(out[3], 12)
 
-   return buf
 
- }
 
- AES.prototype.decryptBlock = function (M) {
 
-   M = asUInt32Array(M)
 
-   // swap
 
-   var m1 = M[1]
 
-   M[1] = M[3]
 
-   M[3] = m1
 
-   var out = cryptBlock(M, this._invKeySchedule, G.INV_SUB_MIX, G.INV_SBOX, this._nRounds)
 
-   var buf = Buffer.allocUnsafe(16)
 
-   buf.writeUInt32BE(out[0], 0)
 
-   buf.writeUInt32BE(out[3], 4)
 
-   buf.writeUInt32BE(out[2], 8)
 
-   buf.writeUInt32BE(out[1], 12)
 
-   return buf
 
- }
 
- AES.prototype.scrub = function () {
 
-   scrubVec(this._keySchedule)
 
-   scrubVec(this._invKeySchedule)
 
-   scrubVec(this._key)
 
- }
 
- module.exports.AES = AES
 
 
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