public string SampleDeriveFromPbkdf(
String strAlgName,
UInt32 targetSize)
{
// Open the specified algorithm.
KeyDerivationAlgorithmProvider objKdfProv = KeyDerivationAlgorithmProvider.OpenAlgorithm(strAlgName);
// Create a buffer that contains the secret used during derivation.
String strSecret = "MyPassword";
IBuffer buffSecret = CryptographicBuffer.ConvertStringToBinary(strSecret, BinaryStringEncoding.Utf8);
// Create a random salt value.
IBuffer buffSalt = CryptographicBuffer.GenerateRandom(32);
// Specify the number of iterations to be used during derivation.
UInt32 iterationCount = 10000;
// Create the derivation parameters.
KeyDerivationParameters pbkdf2Params = KeyDerivationParameters.BuildForPbkdf2(buffSalt, iterationCount);
// Create a key from the secret value.
CryptographicKey keyOriginal = objKdfProv.CreateKey(buffSecret);
// Derive a key based on the original key and the derivation parameters.
IBuffer keyDerived = CryptographicEngine.DeriveKeyMaterial(
keyOriginal,
pbkdf2Params,
targetSize);
// Encode the key to a hexadecimal value (for display)
String strKeyHex = CryptographicBuffer.EncodeToHexString(keyDerived);
// Return the encoded string
return(strKeyHex);
}
/// <summary>
/// Initializes a new instance of the <see cref="KeyDerivationParameters"/> class.
/// </summary>
/// <param name="parameters">The platform parameters.</param>
internal KeyDerivationParameters(Platform.KeyDerivationParameters parameters)
{
Requires.NotNull(parameters, "parameters");
this.Parameters = parameters;
}
/// <summary>
/// Initializes a new instance of the <see cref="KeyDerivationParameters"/> class.
/// </summary>
/// <param name="parameters">The platform parameters.</param>
internal KeyDerivationParameters(Platform.KeyDerivationParameters parameters)
{
Requires.NotNull(parameters, "parameters");
this.platform = parameters;
}
