CODEWITHSUNDEEP
javascriptnode.jscryptography
cyberwombat
cyberwombat

Reputation: 40064

Node crypto - unable to reverse encryption

Why does this not print "hello"?

var cipher = crypto.createCipheriv('rc4', 'secret', '');
crypt = cipher.update('hello', 'binary', 'utf8');
crypt += cipher.final('utf8');

var decipher = crypto.createDecipheriv('rc4','secret', '');
data = decipher.update(crypt, 'binary', 'utf8');
data += decipher.final('utf8');

console.log(data); // prints e/l

Upvotes: 4

Views: 2048

Answers (2)

user1028880
user1028880

Reputation:

Woking code:

var crypto = require('crypto');
var ecr = function(str)
{
    var cipher = crypto.createCipher('aes-256-cbc', 'passphase');
    var cryptedBuffers = [cipher.update(new Buffer(str))];
    cryptedBuffers.push(cipher.final());
    var crypted = Buffer.concat(cryptedBuffers);
    return crypted;
};
var dcr = function(str)
{
    var dcipher = crypto.createDecipher('aes-256-cbc', 'passphase');

    var dcryptedBuffers = [dcipher.update(new Buffer(str))];
    dcryptedBuffers.push(dcipher.final());
    var dcrypted = Buffer.concat(dcryptedBuffers)
        .toString('utf8');
    return dcrypted;
};

console.log(dcr(ecr('hello test')));

Upvotes: 1

AronVietti
AronVietti

Reputation: 379

utf8 is not a valid cipher.final() option, you want binary. Try this.

var cipher = crypto.createCipheriv('rc4', 'secret', '');
crypt = cipher.update('hello', 'utf8', 'binary');
crypt += cipher.final('binary');

var decipher = crypto.createDecipheriv('rc4','secret', '');
data = decipher.update(crypt, 'binary', 'utf8');
data += decipher.final('utf8');

console.log(data);

Upvotes: 6

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