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- (function(){
- var util = Crypto.util;
- var MARC4 = Crypto.MARC4 = {
-
- encrypt: function (message, password) {
- var
-
- m = util.stringToBytes(message),
-
- iv = util.randomBytes(16),
-
- k = Crypto.PBKDF2(password, util.bytesToString(iv), 32, { asBytes: true });
-
- MARC4._marc4(m, k, 1536);
-
- return util.bytesToBase64(iv.concat(m));
- },
- decrypt: function (ciphertext, password) {
- var
-
- c = util.base64ToBytes(ciphertext),
-
- iv = c.splice(0, 16),
-
- k = Crypto.PBKDF2(password, util.bytesToString(iv), 32, { asBytes: true });
-
- MARC4._marc4(c, k, 1536);
-
- return util.bytesToString(c);
- },
-
-
- _marc4: function (m, k, drop) {
-
- var i, j, s, temp;
-
- for (i = 0, s = []; i < 256; i++) s[i] = i;
- for (i = 0, j = 0; i < 256; i++) {
- j = (j + s[i] + k[i % k.length]) % 256;
-
- temp = s[i];
- s[i] = s[j];
- s[j] = temp;
- }
-
- i = j = 0;
-
- for (var k = 0 - drop; k < m.length; k++) {
- i = (i + 1) % 256;
- j = (j + s[i]) % 256;
-
- temp = s[i];
- s[i] = s[j];
- s[j] = temp;
-
- if (k < 0) continue;
-
- m[k] ^= s[(s[i] + s[j]) % 256];
- }
- }
- };
- })();
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