/// <summary>
/// Supply a mnemonic sentence with any words of your choosing not restricted to wordlists and be given seed bytes in return
/// </summary>
/// <param name="mnemonicSentence">
/// The mnemonic sentence we will use to derive seed bytes, Please ensure NFKD Normalized
/// </param>
/// <param name="passphrase">
/// Optional passphrase to protect the seed bytes, Please ensure NFKD Normalized, defaults to empty string
/// </param>
/// <returns>
/// Seed bytes that can be used to create a root in BIP32
/// </returns>
public static byte[] GetSeedBytes(string mnemonicSentence, string passphrase = CEmptyString)
{
mnemonicSentence = mnemonicSentence.Normalize(NormalizationForm.FormKD);
var salt = Encoding.UTF8.GetBytes(CSaltHeader).Concat(Encoding.UTF8.GetBytes(passphrase.Normalize(NormalizationForm.FormKD))).ToArray();
return(Bip39Kdf.Pbkdf2(Encoding.UTF8.GetBytes(mnemonicSentence), salt));
}
/// <summary>
/// A static publicly exposed version of GetDerivedKeyBytes_PBKDF2_HMACSHA512 which matches the exact specification in Rfc2898 PBKDF2 using HMACSHA512
/// </summary>
/// <param name="P">
/// Password passed as a Byte Array
/// </param>
/// <param name="S">
/// Salt passed as a Byte Array
/// </param>
/// <param name="c">
/// Iterations to perform the underlying PRF over
/// </param>
/// <param name="dkLen">
/// Length of Bytes to return, an AES 256 key wold require 32 Bytes
/// </param>
/// <returns>
/// Derived Key in Byte Array form ready for use by chosen encryption function
/// </returns>
public static byte[] Pbkdf2(byte[] P, byte[] S, int c = CMinIterations, int dkLen = hLen)
{
Bip39Kdf rfcObj = new Bip39Kdf(P, S, c);
return(rfcObj.GetDerivedKeyBytes_PBKDF2_HMACSHA512(dkLen));
}
