private async Task <(byte[] CipherKey, byte[] MacKey)> ExpandKeysAsync(CancellationToken cancellationToken)
{
var key = await _keyProvider.GetKeyAsync(cancellationToken);
var hkdf = new Hkdf(HashAlgorithmName.SHA256);
var cipherKey = hkdf.Expand(key, KeyContext.Cipher, 32);
var macKey = hkdf.Expand(key, KeyContext.Mac, 32);
return(cipherKey, macKey);
}
private async Task <(byte[] CipherKey, byte[] MacKey)> ExpandKeysAsync(CancellationToken cancellationToken)
{
var key = await _keyProvider.GetKeyAsync(cancellationToken);
using (var hkdf = new Hkdf <HMACSHA256>())
{
var cipherKey = hkdf.Expand(key, KeyContext.Cipher, 32);
var macKey = hkdf.Expand(key, KeyContext.Mac, 32);
return(cipherKey, macKey);
}
}