Converting AES encryption token code in C# to php
- by joey
Hello,
I have the following .Net code which takes two inputs. 1) A 128 bit base 64 encoded key and 2) the userid. It outputs the AES encrypted token.
I need the php equivalent of the same code, but dont know which corresponding php classes are to be used for RNGCryptoServiceProvider,RijndaelManaged,ICryptoTransform,MemoryStream and CryptoStream.
Im stuck so any help regarding this would be really appreciated.
using System;
using System.Text;
using System.IO;
using System.Security.Cryptography;
class AESToken
{
[STAThread]
static int Main(string[] args)
{
if (args.Length != 2)
{
Console.WriteLine("Usage: AESToken key userId\n");
Console.WriteLine("key Specifies 128-bit AES key base64 encoded supplied by MediaNet to the partner");
Console.WriteLine("userId specifies the unique id");
return -1;
}
string key = args[0];
string userId = args[1];
StringBuilder sb = new StringBuilder();
// This example code uses the magic string “CAMB2B”. The implementer
// must use the appropriate magic string for the web services API.
sb.Append("CAMB2B");
sb.Append(args[1]); // userId
sb.Append('|'); // pipe char
sb.Append(System.DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ssUTC")); //timestamp
Byte[] payload = Encoding.ASCII.GetBytes(sb.ToString());
byte[] salt = new Byte[16]; // 16 bytes of random salt
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
rng.GetBytes(salt); // the plaintext is 16 bytes of salt followed by the payload.
byte[] plaintext = new byte[salt.Length + payload.Length];
salt.CopyTo(plaintext, 0);
payload.CopyTo(plaintext, salt.Length);
// the AES cryptor: 128-bit key, 128-bit block size, CBC mode
RijndaelManaged cryptor = new RijndaelManaged();
cryptor.KeySize = 128;
cryptor.BlockSize = 128;
cryptor.Mode = CipherMode.CBC;
cryptor.GenerateIV();
cryptor.Key = Convert.FromBase64String(args[0]); // the key
byte[] iv = cryptor.IV; // the IV.
// do the encryption
ICryptoTransform encryptor = cryptor.CreateEncryptor(cryptor.Key, iv);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
cs.Write(plaintext, 0, plaintext.Length);
cs.FlushFinalBlock();
byte[] ciphertext = ms.ToArray();
ms.Close();
cs.Close();
// build the token
byte[] tokenBytes = new byte[iv.Length + ciphertext.Length];
iv.CopyTo(tokenBytes, 0);
ciphertext.CopyTo(tokenBytes, iv.Length);
string token = Convert.ToBase64String(tokenBytes);
Console.WriteLine(token);
return 0;
}
}
Please help.
Thank You.
