6f54d4cde6
This is more explanatory ("symmetric encryption") and also does not encourage
its use for people who don't know what they're doing. (It should only be used
in combination with some type of message authentication.)
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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