/// <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.Rfc2898DeriveBytes" /> class using a password, a salt, and number of iterations to derive the key.</summary>
/// <param name="password">The password used to derive the key. </param>
/// <param name="salt">The key salt used to derive the key.</param>
/// <param name="derivationIterations">The number of iterations for the operation. </param>
/// <exception cref="T:System.ArgumentNullException">The password or salt is null. </exception>
public Pbkdf2HmacSha512(string password, Salt salt, int derivationIterations)
{
if (password == null)
{
throw new ArgumentNullException("password");
}
if (salt == null)
{
throw new ArgumentNullException("salt");
}
if (derivationIterations <= 0)
{
throw new ArgumentOutOfRangeException("derivationIterations", "Must be greater than 0.");
}
_bytes = F(password, salt, derivationIterations);
}
/// <summary>
/// Create a KeyWrap instance for wrapping or unwrapping
/// </summary>
/// <param name="salt">A salt. This is required by AxCrypt, although the algorithm supports not using a salt.</param>
/// <param name="keyWrapIterations">The number of wrapping iterations, at least 6</param>
/// <param name="mode">Use original specification mode or AxCrypt mode (only difference is that 't' is little endian in AxCrypt mode)</param>
public KeyWrap(Salt salt, long keyWrapIterations, KeyWrapMode mode)
{
if (salt == null)
{
throw new ArgumentNullException("salt");
}
if (keyWrapIterations < 6)
{
throw new InternalErrorException("Key wrap iterations must be at least 6.");
}
if (mode != KeyWrapMode.Specification && mode != KeyWrapMode.AxCrypt)
{
throw new InternalErrorException("mode");
}
_salt = salt;
_mode = mode;
_keyWrapIterations = keyWrapIterations;
}
/// <summary>
/// Instantiate a thumb print
/// </summary>
/// <param name="passphrase">The passphrase to thumbprint.</param>
/// <param name="salt">The salt to use.</param>
public SymmetricKeyThumbprint(Passphrase passphrase, Salt salt, long keyWrapIterations)
{
if (passphrase == null)
{
throw new ArgumentNullException("passphrase");
}
if (salt == null)
{
throw new ArgumentNullException("salt");
}
ICryptoFactory factory = Resolve.CryptoFactory.Minimum;
ICrypto crypto = factory.CreateCrypto(factory.RestoreDerivedKey(passphrase, salt, CryptoFactory.DerivationIterations).DerivedKey, null, 0);
KeyWrap keyWrap = new KeyWrap(salt, keyWrapIterations, KeyWrapMode.Specification);
byte[] wrap = keyWrap.Wrap(crypto, crypto.Key);
_bytes = wrap.Reduce(6);
}
public IDerivedKey RestoreDerivedKey(Passphrase passphrase, Salt salt, int derivationIterations)
{
return(new V2DerivedKey(passphrase, salt, derivationIterations, 128));
}
/// <summary>
/// Create an instance of tranform suitable for NIST Key Wrap
/// </summary>
/// <returns></returns>
/// <value>
/// An instance of the algorithm.
/// </value>
public override IKeyWrapTransform CreateKeyWrapTransform(Salt salt, KeyWrapDirection keyWrapDirection)
{
return(new BlockAlgorithmKeyWrapTransform(CreateAlgorithmInternal(), salt, keyWrapDirection));
}
/// <summary> /// Create an instance of a transform suitable for NIST Key Wrap. /// </summary> /// <param name="salt"></param> /// <param name="keyWrapDirection"></param> /// <returns></returns> /// <value> /// An instance of the transform. /// </value> public abstract IKeyWrapTransform CreateKeyWrapTransform(Salt salt, KeyWrapDirection keyWrapDirection);
