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encryption.js
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encryption.js
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(function() {
'use strict';
var ENCRYPTION = 'AES-256-CTR';
var crypto = require('crypto');
module.exports = {
encrypt: function(str, key, iv) {
var cipher = crypto.createCipheriv(ENCRYPTION, key, iv),
encrypted = cipher.update(str, 'utf8', 'hex');
encrypted += cipher.final('hex');
return encrypted;
},
decrypt: function(str, key, iv) {
var decipher = crypto.createDecipheriv(ENCRYPTION, key, iv),
decrypted = decipher.update(str, 'hex', 'utf8');
decrypted += decipher.final('utf8');
return decrypted;
},
salt: function() {
return crypto.randomBytes(15);
},
iv: function() {
return crypto.randomBytes(16);
},
key: function(secret, salt) {
return crypto.pbkdf2Sync(secret, salt, 4096, 32);
},
hex2bytes: function(hex) {
if(hex.length % 2 !== 0)
throw new Error(hex + ' is not a valid hex string');
var bytes = new Buffer(hex.length / 2);
for(var i = 0; i < hex.length; i += 2) {
bytes[i / 2] = parseInt(hex.substr(i, 2), 16);
}
return bytes;
}
};
}());