forked from sheetjs/sheetjs
35 lines
954 B
JavaScript
35 lines
954 B
JavaScript
var OFFCRYPTO = {};
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var make_offcrypto = function(O, _crypto) {
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var crypto;
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if(typeof _crypto !== 'undefined') crypto = _crypto;
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else if(typeof require !== 'undefined') {
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try { crypto = require('crypto'); }
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catch(e) { crypto = null; }
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}
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O.rc4 = function(key, data) {
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var S = new Array(256);
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var c = 0, i = 0, j = 0, t = 0;
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for(i = 0; i != 256; ++i) S[i] = i;
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for(i = 0; i != 256; ++i) {
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j = (j + S[i] + (key[i%key.length]).charCodeAt(0))&255;
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t = S[i]; S[i] = S[j]; S[j] = t;
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}
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i = j = 0; out = Buffer(data.length);
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for(c = 0; c != data.length; ++c) {
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i = (i + 1)&255;
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j = (j + S[i])%256;
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t = S[i]; S[i] = S[j]; S[j] = t;
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out[c] = (data[c] ^ S[(S[i]+S[j])&255]);
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}
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return out;
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};
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O.md5 = function(hex) {
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if(!crypto) throw new Error("Unsupported crypto");
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return crypto.createHash('md5').update(hex).digest('hex');
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};
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};
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make_offcrypto(OFFCRYPTO, typeof crypto !== "undefined" ? crypto : undefined);
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