/// <param name="prf">
/// The Pseudo Random Function to use for calculating the derived key
/// </param>
/// <param name="salt">
/// The initial salt to use in calculating the derived key
/// </param>
/// <param name="iterationCount">
/// Number of iterations. RFC 2898 recommends a minimum of 1000
/// iterations (in the year 2000) ideally with number of iterations
/// adjusted on a regular basis (e.g. each year).
/// </param>
public PBKDF2DeriveBytes(
IPseudoRandomFunction prf, byte[] salt, long iterationCount)
{
if (prf == null)
{
throw new ArgumentNullException("prf");
}
if (salt == null)
{
throw new ArgumentNullException("salt");
}
this.prf = prf;
this.salt = salt;
this.iterationCount = iterationCount;
// Prepare combined salt = concat(original salt, block number)
saltAndBlockNumber = new byte[salt.Length + 4];
Buffer.BlockCopy(salt, 0, saltAndBlockNumber, 0, salt.Length);
Reset();
}
/// <param name="prf">
/// The Pseudo Random Function to use for calculating the derived key
/// </param>
/// <param name="salt">
/// The initial salt to use in calculating the derived key
/// </param>
/// <param name="iterationCount">
/// Number of iterations. RFC 2898 recommends a minimum of 1000
/// iterations (in the year 2000) ideally with number of iterations
/// adjusted on a regular basis (e.g. each year).
/// </param>
public PBKDF2DeriveBytes(IPseudoRandomFunction prf, byte[] salt, long iterationCount)
{
if (prf == null)
{
throw new ArgumentNullException("prf");
}
if (salt == null)
{
throw new ArgumentNullException("salt");
}
this.prf = prf;
this.salt = salt;
this.iterationCount = iterationCount;
// Prepare combined salt = concat(original salt, block number)
saltAndBlockNumber = new byte[salt.Length + 4];
Buffer.BlockCopy(salt, 0, saltAndBlockNumber, 0, salt.Length);
Reset();
}
private static void ParseArguments(IEnumerable<string> args)
{
// Somewhat misusing ArgumentException here to throw parameter parser errors...
try
{
options.Parse(args);
}
catch (OptionException e)
{
throw new ArgumentException(e.Message);
}
if (help)
{
ShowHelp();
Environment.Exit(0);
}
if (password == null)
{
throw new ArgumentException("Missing password parameter");
}
if (salt == null)
{
throw new ArgumentException("Missing salt parameter");
}
byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
saltBytes = Encoding.UTF8.GetBytes(salt);
string normalizedAlgorithmName = algorithmName.Replace("-", "").ToUpperInvariant();
switch (normalizedAlgorithmName)
{
case "MD5":
prf = new HMACPseudoRandomFunction<HMACMD5>(passwordBytes);
break;
case "SHA1":
prf = new HMACPseudoRandomFunction<HMACSHA1>(passwordBytes);
break;
case "SHA256":
prf = new HMACPseudoRandomFunction<HMACSHA256>(passwordBytes);
break;
case "SHA384":
prf = new HMACPseudoRandomFunction<HMACSHA384>(passwordBytes);
break;
case "SHA512":
prf = new HMACPseudoRandomFunction<HMACSHA512>(passwordBytes);
break;
default:
throw new ArgumentException(String.Format("Unsupported algorithm: {0}", algorithmName));
}
// Use hash size as default number of output bytes
outputBytes = outputBytes == 0 ? prf.HashSize : outputBytes;
}
private static void ParseArguments(IEnumerable <string> args)
{
// Somewhat misusing ArgumentException here to throw parameter parser errors...
try
{
options.Parse(args);
}
catch (OptionException e)
{
throw new ArgumentException(e.Message);
}
if (help)
{
ShowHelp();
Environment.Exit(0);
}
if (password == null)
{
throw new ArgumentException("Missing password parameter");
}
if (salt == null)
{
throw new ArgumentException("Missing salt parameter");
}
byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
saltBytes = Encoding.UTF8.GetBytes(salt);
string normalizedAlgorithmName = algorithmName.Replace("-", "").ToUpperInvariant();
switch (normalizedAlgorithmName)
{
case "MD5":
prf = new HMACPseudoRandomFunction <HMACMD5>(passwordBytes);
break;
case "SHA1":
prf = new HMACPseudoRandomFunction <HMACSHA1>(passwordBytes);
break;
case "SHA256":
prf = new HMACPseudoRandomFunction <HMACSHA256>(passwordBytes);
break;
case "SHA384":
prf = new HMACPseudoRandomFunction <HMACSHA384>(passwordBytes);
break;
case "SHA512":
prf = new HMACPseudoRandomFunction <HMACSHA512>(passwordBytes);
break;
default:
throw new ArgumentException(String.Format("Unsupported algorithm: {0}", algorithmName));
}
// Use hash size as default number of output bytes
outputBytes = outputBytes == 0 ? prf.HashSize : outputBytes;
}
