34 lines
1009 B
JavaScript
34 lines
1009 B
JavaScript
var AES = require('./aes');
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var CBC = require('./cbc');
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var Random = require('../random');
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var Hash = require('../hash');
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var SymEnc = function SymEnc() {
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};
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SymEnc.encrypt = function(messagebuf, passwordstr) {
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var cipherkeybuf = Hash.sha256(new Buffer(passwordstr));
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return SymEnc.encryptCipherkey(messagebuf, cipherkeybuf);
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};
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SymEnc.decrypt = function(encbuf, passwordstr) {
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var cipherkeybuf = Hash.sha256(new Buffer(passwordstr));
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return SymEnc.decryptCipherkey(encbuf, cipherkeybuf);
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};
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SymEnc.encryptCipherkey = function(messagebuf, cipherkeybuf, ivbuf) {
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ivbuf = ivbuf || Random.getRandomBuffer(128 / 8);
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var ctbuf = CBC.encrypt(messagebuf, ivbuf, AES, cipherkeybuf);
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var encbuf = Buffer.concat([ivbuf, ctbuf]);
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return encbuf;
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};
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SymEnc.decryptCipherkey = function(encbuf, cipherkeybuf) {
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var ivbuf = encbuf.slice(0, 128 / 8);
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var ctbuf = encbuf.slice(128 / 8);
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var messagebuf = CBC.decrypt(ctbuf, ivbuf, AES, cipherkeybuf);
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return messagebuf;
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};
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module.exports = SymEnc;
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