Sha256 with 24 length key SWIFT

[lucianofedericoolmedo]

Hi, I have this snippet of code working with a sha256 with 32 length key

let plainText :String = "this is my plain text"
let key :String = "your key"
let cryptLib = CryptLib()
let iv = "5/LRE3jKOTCav8VB"
let size = 32
let sha = cryptLib.sha256(key, length: size)
let cipherText = cryptLib.encrypt(plainText.data(using: String.Encoding.utf8), key: sha, iv: iv)
print(cipherText!.base64EncodedString())
let elem = cryptLib.decrypt(cipherText, key: sha, iv: iv)
let salida = String.init(data: elem!, encoding: String.Encoding.utf8)
print(salida!)

But when i change size = 24, it fails the decrypt, is there any way to make the decryption it work ?, i am in a proyect that needs a 24 length key.