Crypto.js decrypt with key and iv (vector) in byte arrays

Question

I have to decrypt some strings which are AES encrypted.

Example encrypted string: 129212143036071008133136215105140171136216244116

I have a key, and a vector (iv) supplied to me in a byte-array format:

Key: [ 123, 217, 20, 11, 24, 26, 85, 45, 114, 184, 27, 162, 37, 115, 222, 209, 241, 24, 175, 144, 175, 53, 196, 29, 24, 23, 17, 218, 131, 226, 53, 209 ]

Vector (iv): [ 146, 66, 191, 151, 23, 3, 113, 119, 231, 131, 133, 112, 79, 32, 114, 136 ]

I should be able to decrypt the string and get:

Correct output: testtest

I'm trying to use Crypto.js but I can't find a way to use the supplied key and vector. I can't find a way to convert the byte-arrays to hex.

var encrypted = '129212143036071008133136215105140171136216244116';
var key = CryptoJS.enc.Hex.parse([ 123, 217, 20, 11, 24, 26, 85, 45, 114, 184, 27, 162, 37, 115, 222, 209, 241, 24, 175, 144, 175, 53, 196, 29, 24, 23, 17, 218, 131, 226, 53, 209 ]);
var iv  = CryptoJS.enc.Hex.parse([ 146, 66, 191, 151, 23, 3, 113, 119, 231, 131, 133, 112, 79, 32, 114, 136 ]);

var decrypted = CryptoJS.AES.decrypt(encrypted, key, { iv: iv });

console.log('Output: '+decrypted.toString(CryptoJS.enc.Utf8)); //Should be "testtest"

I would be so grateful if anyone could show me how to decrypt the example string using the key and vector with Crypto.js OR any other js method.

Thanks so much for any help, Kind regards

Answer 1

I ended up using a .net ashx generic handler, to which i post the data over ssl, and the server-side decryption takes place using the simpleAES class. This class uses block-size as a parameter which seems to make the difference and using this approach I was able to decrypt all the strings i needed to.

More info about simpleAES here: https://github.com/huanlin/YetAnotherLibrary/blob/master/Source/Yalib/Cryptography/SimpleAes.cs

Thanks again for the help!