static KeySet LoadKeys(string fileName)
{
if (fileName == null)
{
fileName = "ServerKeys.cbor";
}
KeySet keys = new KeySet();
FileStream fs = new FileStream(fileName, FileMode.Open);
using (BinaryReader reader = new BinaryReader(fs)) {
byte[] data = reader.ReadBytes((int)fs.Length);
CBORObject obj = CBORObject.DecodeFromBytes(data);
for (int i = 0; i < obj.Count; i++)
{
OneKey key = new OneKey(obj[i]);
string[] usages = key[_UsageKey].AsString().Split(' ');
foreach (String usage in usages)
{
if (usage == "oscoap")
{
SecurityContext ctx = SecurityContext.DeriveContext(
key[CoseKeyParameterKeys.Octet_k].GetByteString(),
key[CBORObject.FromObject("RecipID")].GetByteString(),
key[CBORObject.FromObject("SenderID")].GetByteString(), null,
key[CoseKeyKeys.Algorithm]);
SecurityContextSet.AllContexts.Add(ctx);
break;
}
#if DEV_VERSION
else if (usage == "oscoap-group")
{
SecurityContext ctx = SecurityContext.DeriveGroupContext(
key[CoseKeyParameterKeys.Octet_k].GetByteString(),
key[CoseKeyKeys.KeyIdentifier].GetByteString(),
key[CBORObject.FromObject("sender")][CBORObject.FromObject("ID")].GetByteString(), null,
null, key[CoseKeyKeys.Algorithm]);
ctx.Sender.SigningKey = new OneKey(obj[i]["sign"]);
foreach (CBORObject recipient in key[CBORObject.FromObject("recipients")].Values)
{
ctx.AddRecipient(recipient[CBORObject.FromObject("ID")].GetByteString(),
new OneKey(recipient["sign"]));
}
SecurityContextSet.AllContexts.Add(ctx);
}
#endif
else if (usage == "dtls")
{
if (key.HasPrivateKey())
{
DtlsSignKeys.AddKey(key);
}
else
{
DtlsValidateKeys.AddKey(key);
}
}
else if (usage == "edhoc")
{
if (key[CoseKeyKeys.KeyType].Equals(GeneralValues.KeyType_EC) ||
key[CoseKeyKeys.KeyType].Equals(GeneralValues.KeyType_OKP))
{
if (key.ContainsName(CoseKeyParameterKeys.EC_D))
{
edhocSign = key;
}
else
{
edhocKeys.AddKey(key);
}
}
else
{
edhocKeys.AddKey(key);
}
}
}
if ((usages.Length != 1) || (usages[0] != "oscoap"))
{
keys.AddKey(key);
}
}
reader.Close();
}
return(keys);
}