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Diffstat (limited to 'library/cryptojs/components/aes.js')
| -rw-r--r-- | library/cryptojs/components/aes.js | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/library/cryptojs/components/aes.js b/library/cryptojs/components/aes.js new file mode 100644 index 000000000..13bfd80a2 --- /dev/null +++ b/library/cryptojs/components/aes.js @@ -0,0 +1,213 @@ +/* +CryptoJS v3.1.2 +code.google.com/p/crypto-js +(c) 2009-2013 by Jeff Mott. All rights reserved. +code.google.com/p/crypto-js/wiki/License +*/ +(function () {
+ // Shortcuts
+ var C = CryptoJS;
+ var C_lib = C.lib;
+ var BlockCipher = C_lib.BlockCipher;
+ var C_algo = C.algo;
+
+ // Lookup tables
+ var SBOX = [];
+ var INV_SBOX = [];
+ var SUB_MIX_0 = [];
+ var SUB_MIX_1 = [];
+ var SUB_MIX_2 = [];
+ var SUB_MIX_3 = [];
+ var INV_SUB_MIX_0 = [];
+ var INV_SUB_MIX_1 = [];
+ var INV_SUB_MIX_2 = [];
+ var INV_SUB_MIX_3 = [];
+
+ // Compute lookup tables
+ (function () {
+ // Compute double table
+ var d = [];
+ for (var i = 0; i < 256; i++) {
+ if (i < 128) {
+ d[i] = i << 1;
+ } else {
+ d[i] = (i << 1) ^ 0x11b;
+ }
+ }
+
+ // 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
+ var 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;
+
+ // Compute next counter
+ if (!x) {
+ x = xi = 1;
+ } else {
+ x = x2 ^ d[d[d[x8 ^ x2]]];
+ xi ^= d[d[xi]];
+ }
+ }
+ }());
+
+ // Precomputed Rcon lookup
+ var RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36];
+
+ /**
+ * AES block cipher algorithm.
+ */
+ var AES = C_algo.AES = BlockCipher.extend({
+ _doReset: function () {
+ // Shortcuts
+ var key = this._key;
+ var keyWords = key.words;
+ var keySize = key.sigBytes / 4;
+
+ // Compute number of rounds
+ var nRounds = this._nRounds = keySize + 6
+
+ // Compute number of key schedule rows
+ var ksRows = (nRounds + 1) * 4;
+
+ // Compute key schedule
+ var keySchedule = this._keySchedule = [];
+ for (var ksRow = 0; ksRow < ksRows; ksRow++) {
+ if (ksRow < keySize) {
+ keySchedule[ksRow] = keyWords[ksRow];
+ } else {
+ var t = keySchedule[ksRow - 1];
+
+ if (!(ksRow % keySize)) {
+ // Rot word
+ t = (t << 8) | (t >>> 24);
+
+ // Sub word
+ t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff];
+
+ // Mix Rcon
+ t ^= RCON[(ksRow / keySize) | 0] << 24;
+ } else if (keySize > 6 && ksRow % keySize == 4) {
+ // Sub word
+ t = (SBOX[t >>> 24] << 24) | (SBOX[(t >>> 16) & 0xff] << 16) | (SBOX[(t >>> 8) & 0xff] << 8) | SBOX[t & 0xff];
+ }
+
+ keySchedule[ksRow] = keySchedule[ksRow - keySize] ^ t;
+ }
+ }
+
+ // Compute inv key schedule
+ var invKeySchedule = this._invKeySchedule = [];
+ for (var invKsRow = 0; invKsRow < ksRows; invKsRow++) {
+ var ksRow = ksRows - invKsRow;
+
+ if (invKsRow % 4) {
+ var t = keySchedule[ksRow];
+ } else {
+ var t = keySchedule[ksRow - 4];
+ }
+
+ if (invKsRow < 4 || ksRow <= 4) {
+ invKeySchedule[invKsRow] = t;
+ } else {
+ invKeySchedule[invKsRow] = INV_SUB_MIX_0[SBOX[t >>> 24]] ^ INV_SUB_MIX_1[SBOX[(t >>> 16) & 0xff]] ^
+ INV_SUB_MIX_2[SBOX[(t >>> 8) & 0xff]] ^ INV_SUB_MIX_3[SBOX[t & 0xff]];
+ }
+ }
+ },
+
+ encryptBlock: function (M, offset) {
+ this._doCryptBlock(M, offset, this._keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX);
+ },
+
+ decryptBlock: function (M, offset) {
+ // Swap 2nd and 4th rows
+ var t = M[offset + 1];
+ M[offset + 1] = M[offset + 3];
+ M[offset + 3] = t;
+
+ this._doCryptBlock(M, offset, this._invKeySchedule, INV_SUB_MIX_0, INV_SUB_MIX_1, INV_SUB_MIX_2, INV_SUB_MIX_3, INV_SBOX);
+
+ // Inv swap 2nd and 4th rows
+ var t = M[offset + 1];
+ M[offset + 1] = M[offset + 3];
+ M[offset + 3] = t;
+ },
+
+ _doCryptBlock: function (M, offset, keySchedule, SUB_MIX_0, SUB_MIX_1, SUB_MIX_2, SUB_MIX_3, SBOX) {
+ // Shortcut
+ var nRounds = this._nRounds;
+
+ // Get input, add round key
+ var s0 = M[offset] ^ keySchedule[0];
+ var s1 = M[offset + 1] ^ keySchedule[1];
+ var s2 = M[offset + 2] ^ keySchedule[2];
+ var s3 = M[offset + 3] ^ keySchedule[3];
+
+ // Key schedule row counter
+ var ksRow = 4;
+
+ // Rounds
+ for (var round = 1; round < nRounds; round++) {
+ // Shift rows, sub bytes, mix columns, add round key
+ var t0 = SUB_MIX_0[s0 >>> 24] ^ SUB_MIX_1[(s1 >>> 16) & 0xff] ^ SUB_MIX_2[(s2 >>> 8) & 0xff] ^ SUB_MIX_3[s3 & 0xff] ^ keySchedule[ksRow++];
+ var t1 = SUB_MIX_0[s1 >>> 24] ^ SUB_MIX_1[(s2 >>> 16) & 0xff] ^ SUB_MIX_2[(s3 >>> 8) & 0xff] ^ SUB_MIX_3[s0 & 0xff] ^ keySchedule[ksRow++];
+ var t2 = SUB_MIX_0[s2 >>> 24] ^ SUB_MIX_1[(s3 >>> 16) & 0xff] ^ SUB_MIX_2[(s0 >>> 8) & 0xff] ^ SUB_MIX_3[s1 & 0xff] ^ keySchedule[ksRow++];
+ var t3 = SUB_MIX_0[s3 >>> 24] ^ SUB_MIX_1[(s0 >>> 16) & 0xff] ^ SUB_MIX_2[(s1 >>> 8) & 0xff] ^ SUB_MIX_3[s2 & 0xff] ^ keySchedule[ksRow++];
+
+ // Update state
+ s0 = t0;
+ s1 = t1;
+ s2 = t2;
+ s3 = t3;
+ }
+
+ // Shift rows, sub bytes, add round key
+ var t0 = ((SBOX[s0 >>> 24] << 24) | (SBOX[(s1 >>> 16) & 0xff] << 16) | (SBOX[(s2 >>> 8) & 0xff] << 8) | SBOX[s3 & 0xff]) ^ keySchedule[ksRow++];
+ var t1 = ((SBOX[s1 >>> 24] << 24) | (SBOX[(s2 >>> 16) & 0xff] << 16) | (SBOX[(s3 >>> 8) & 0xff] << 8) | SBOX[s0 & 0xff]) ^ keySchedule[ksRow++];
+ var t2 = ((SBOX[s2 >>> 24] << 24) | (SBOX[(s3 >>> 16) & 0xff] << 16) | (SBOX[(s0 >>> 8) & 0xff] << 8) | SBOX[s1 & 0xff]) ^ keySchedule[ksRow++];
+ var t3 = ((SBOX[s3 >>> 24] << 24) | (SBOX[(s0 >>> 16) & 0xff] << 16) | (SBOX[(s1 >>> 8) & 0xff] << 8) | SBOX[s2 & 0xff]) ^ keySchedule[ksRow++];
+
+ // Set output
+ M[offset] = t0;
+ M[offset + 1] = t1;
+ M[offset + 2] = t2;
+ M[offset + 3] = t3;
+ },
+
+ keySize: 256/32
+ });
+
+ /**
+ * Shortcut functions to the cipher's object interface.
+ *
+ * @example
+ *
+ * var ciphertext = CryptoJS.AES.encrypt(message, key, cfg);
+ * var plaintext = CryptoJS.AES.decrypt(ciphertext, key, cfg);
+ */
+ C.AES = BlockCipher._createHelper(AES);
+}());
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