AES Encrypt and Decrypt

Question

I write an application by swift, i need AES Encrypt and Decrypt functionality, i received encrypted data from another .Net solution, but i can't find something to do it.

This is my .net Encryption:

 public static byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)     {         byte[] encryptedBytes = null;          byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };          using (MemoryStream ms = new MemoryStream())         {             using (RijndaelManaged AES = new RijndaelManaged())             {                 AES.KeySize = 256;                 AES.BlockSize = 128;                  var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);                 AES.Key = key.GetBytes(AES.KeySize / 8);                 AES.IV = key.GetBytes(AES.BlockSize / 8);                  AES.Mode = CipherMode.CBC;                  using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))                 {                     cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);                     cs.Close();                 }                 encryptedBytes = ms.ToArray();             }         }          return encryptedBytes;     } 

I need to decrypt function in swift.

Answer 1

CryptoSwift Example

Updated to Swift 2

import Foundation import CryptoSwift  extension String {     func aesEncrypt(key: String, iv: String) throws -> String{         let data = self.dataUsingEncoding(NSUTF8StringEncoding)         let enc = try AES(key: key, iv: iv, blockMode:.CBC).encrypt(data!.arrayOfBytes(), padding: PKCS7())         let encData = NSData(bytes: enc, length: Int(enc.count))         let base64String: String = encData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0));         let result = String(base64String)         return result     }      func aesDecrypt(key: String, iv: String) throws -> String {         let data = NSData(base64EncodedString: self, options: NSDataBase64DecodingOptions(rawValue: 0))         let dec = try AES(key: key, iv: iv, blockMode:.CBC).decrypt(data!.arrayOfBytes(), padding: PKCS7())         let decData = NSData(bytes: dec, length: Int(dec.count))         let result = NSString(data: decData, encoding: NSUTF8StringEncoding)         return String(result!)     } } 

Usage:

let key = "bbC2H19lkVbQDfakxcrtNMQdd0FloLyw" // length == 32 let iv = "gqLOHUioQ0QjhuvI" // length == 16 let s = "string to encrypt" let enc = try! s.aesEncrypt(key, iv: iv) let dec = try! enc.aesDecrypt(key, iv: iv) print(s) // string to encrypt print("enc:\(enc)") // 2r0+KirTTegQfF4wI8rws0LuV8h82rHyyYz7xBpXIpM= print("dec:\(dec)") // string to encrypt print("\(s == dec)") // true 

Make sure you have the right length of iv (16) and key (32) then you won't hit "Block size and Initialization Vector must be the same length!" error.

Answer 2

CryptoSwift Example

Updated SWIFT 4.*

func aesEncrypt() throws -> String {     let encrypted = try AES(key: KEY, iv: IV, padding: .pkcs7).encrypt([UInt8](self.data(using: .utf8)!))     return Data(encrypted).base64EncodedString() }  func aesDecrypt() throws -> String {     guard let data = Data(base64Encoded: self) else { return "" }     let decrypted = try AES(key: KEY, iv: IV, padding: .pkcs7).decrypt([UInt8](data))     return String(bytes: decrypted, encoding: .utf8) ?? self }