求.net和PHP双料高手翻译代码

[popcat007]

代码如下，求翻译成PHP代码：

 public string GenerateSalt()
        {
            byte[] array = new byte[16];
            new RNGCryptoServiceProvider().GetBytes(array);
            return Convert.ToBase64String(array);
        }
public string EncodePassword(string pass, int passwordFormat, string salt)
        {            
            if (passwordFormat == 0)
            {
                return pass;
            }
            byte[] bytes = Encoding.Unicode.GetBytes(pass);          
            byte[] array = Convert.FromBase64String(salt);            
            byte[] array2 = new byte[array.Length + bytes.Length];           
           
            System.Buffer.BlockCopy(array, 0, array2, 0, array.Length);
            
            System.Buffer.BlockCopy(bytes, 0, array2, array.Length, bytes.Length);
          
            byte[] inArray;
           
                HashAlgorithm hashAlgorithm = HashAlgorithm.Create(Membership.HashAlgorithmType);
                inArray = hashAlgorithm.ComputeHash(array2);
              
            return Convert.ToBase64String(inArray);
        }

[xuzuning]

function GenerateSalt() {
  $s = pack('L*', rand(), rand(), rand(), rand());
  return base64_encode($s);
}

function EncodePassword($pass, $passwordFormat, $salt) {
  if($passwordFormat ==0) return $pass;
  $s = $pass . base64_decode($salt);
  return base64_encode(sha1($s));
}

[csdddn]

hash算法没有说明