public static EllipticCurveEncryptionInformation Create(IEnumerable <EcKeyPair> publicKeys, byte[] secretKey)
{
var ephemeralKey = EllipticCurveCryptographer.CreateKeyPair(true);
var result = new EllipticCurveEncryptionInformation
{
EphemeralKey = ephemeralKey.ExportPublicKey(),
};
result.DerivedSecrets = new List <DerivedSecret>();
foreach (var publicKey in publicKeys)
{
var deriveSecret = EllipticCurveCryptographer.DeriveSecret(ephemeralKey, publicKey);
var input = new MemoryStream(secretKey);
var output = new MemoryStream();
SymmetricEncryption.Encrypt(input, output, deriveSecret);
var saltedHash = publicKey.GetPublicKeySaltedHash();
var derivedSecret = new DerivedSecret
{
PublicKeyHash = saltedHash.hash,
PublicKeyHashSalt = saltedHash.salt,
EncryptedSharedSecret = output.ToArray()
};
result.DerivedSecrets.Add(derivedSecret);
}
return(result);
}
