/// <summary> Creates a SealedPublicKeyBox</summary>
/// <param name="message">The message.</param>
/// <param name="recipientPublicKey">The 32 byte recipient's public key.</param>
/// <returns>The anonymously encrypted message.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="CryptographicException"></exception>
public static byte[] Create(byte[] message, byte[] recipientPublicKey)
{
//validate the length of the recipient public key
if (recipientPublicKey == null || recipientPublicKey.Length != RecipientPublicKeyBytes)
{
throw new KeyOutOfRangeException("recipientPublicKey",
(recipientPublicKey == null) ? 0 : recipientPublicKey.Length,
string.Format("recipientPublicKey must be {0} bytes in length.", RecipientPublicKeyBytes));
}
var buffer = new byte[message.Length + CryptoBoxSealbytes];
var ret = SodiumLibrary.crypto_box_seal(buffer, message, message.Length, recipientPublicKey);
if (ret != 0)
{
throw new CryptographicException("Failed to create SealedBox");
}
return(buffer);
}