public async Task <byte[]> Sign(CancellationToken ct, string pairName, byte[] data)
{
if (this.Log().IsEnabled(LogLevel.Debug))
{
this.Log().Debug($"Signing a key pair (pair name: '{pairName}').");
}
pairName.Validation().NotNullOrEmpty(nameof(pairName));
data.Validation().NotNull(nameof(data));
await AssertIsEnabled(ct);
using (await _asyncLock.LockAsync(ct))
{
var algorithm = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.EcdsaP256Sha256);
var rawKeyPair = RetrieveKey(pairName).AsBuffer();
var keyPair = algorithm.ImportKeyPair(rawKeyPair);
using (var sha256 = SHA256.Create())
{
var hash = sha256.ComputeHash(data);
var signature = await CryptographicEngine.SignHashedDataAsync(keyPair, hash.AsBuffer());
if (this.Log().IsEnabled(LogLevel.Information))
{
this.Log().Info($"Successfully signed a key pair (pair name: '{pairName}').");
}
return(signature.ToArray());
}
}
}