void acquirePublicKey(PublicKey publicKey)
{
// do not load public key again if it is already loaded
if (checkPublicKeyIsLoaded())
{
return;
}
switch (publicKey.Oid.Value)
{
case AlgorithmOids.ECC:
keyType = KeyType.EcDsa;
break;
case AlgorithmOids.RSA:
keyType = KeyType.Rsa;
break;
case AlgorithmOids.DSA:
keyType = KeyType.Dsa;
break;
default:
throw new NotSupportedException("Public key algorithm is not supported");
}
// regardless of public key algorithm and provider, load public keys to CNG provider for unification
// and wider signature formats and padding support.
Int32 hresult = NCrypt.NCryptOpenStorageProvider(out SafeNCryptProviderHandle phProvider, MSFT_KSP_NAME, 0);
if (hresult != 0)
{
throw new CryptographicException(hresult);
}
Byte[] blob = publicKey.GetCryptBlob();
hresult = NCrypt.NCryptImportKey(phProvider, IntPtr.Zero, "PUBLICBLOB", IntPtr.Zero, out phPubKey, blob,
blob.Length, 0);
if (hresult != 0)
{
throw new CryptographicException(hresult);
}
}
public static Int32 GetKeyLength(this PublicKey publicKey)
{
if (publicKey == null)
{
throw new ArgumentNullException(nameof(publicKey));
}
switch (publicKey.Oid.Value)
{
case AlgorithmOid.RSA:
case AlgorithmOid.DSA:
return(publicKey.Key.KeySize);
case AlgorithmOid.ECC:
var cryptBlob = publicKey.GetCryptBlob();
using (CngKey cngKey = CngKey.Import(cryptBlob, CngKeyBlobFormat.EccPublicBlob)) {
return(cngKey.KeySize);
}
default:
return(0);
}
}