protected static void The_key_is(CngAlgorithm algorithm)
{
// create a new key pair
The_original_key = CngKey.Create(algorithm);
the_data = Encoding.UTF8.GetBytes("Hello world");
// write the key pair to a stream in PEM format
var ms = new MemoryStream();
new PemWriter(ms).WritePublicKey(The_original_key);
ms.Seek(0, SeekOrigin.Begin);
// read the key back from the stream
var builder = new CngBuilder(new PemReader(ms));
The_roundtripped_key = builder.Build();
}
public ECDsaCng LoadRemoteKey(JsonWebTokenHeader header)
{
var dsa = new ECDsaCng();
var cached = _cache.GetPublicKeyBytes(header.KeyUri.ToString(), header.KeyId);
if (null != cached)
{
dsa.FromXmlString(Encoding.UTF8.GetString(cached), ECKeyXmlFormat.Rfc4050);
return(dsa);
}
string data;
using (var wc = new WebClient())
{
try
{
data = wc.DownloadString(header.KeyUri);
}
catch (WebException e)
{
throw new RemoteKeyInaccessibleException("Unable to download the public key from URI " + header.KeyUri, e);
}
}
switch (header.KeyFormat)
{
case KeyFormat.Rfc4050:
dsa.FromXmlString(data, ECKeyXmlFormat.Rfc4050);
_cache.Cache(Encoding.UTF8.GetBytes(data), header.KeyId, header.KeyUri.ToString());
return(dsa);
case KeyFormat.X509:
var ms = new MemoryStream(Encoding.ASCII.GetBytes(data));
var reader = new CngBuilder(new PemReader(ms));
dsa = new ECDsaCng(reader.Build());
_cache.Cache(Encoding.UTF8.GetBytes(dsa.ToXmlString(ECKeyXmlFormat.Rfc4050)), header.KeyId, header.KeyUri.ToString());
return(dsa);
}
throw new NotSupportedException("Can not open an ECC key with the keyformat " + header.KeyFormat);
}
