public static AsymmetricAlgorithm GetPublicKeyAlgorithm(this X509Certificate2 certificate)
{
if (certificate == null)
{
throw ExceptionUtility.ArgumentNull("certificate");
}
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(certificate.PublicKey.EncodedParameters.RawData);
cspObject.DecodePublicKey(certificate.PublicKey.EncodedKeyValue.RawData);
var cspBlobData = CryptoApiHelper.EncodePublicBlob(cspObject);
var publicKey = new Gost3410AsymmetricAlgorithm();
publicKey.ImportCspBlob(cspBlobData);
return(publicKey);
}
public AsymmetricAlgorithm DecodePublicKey(Oid oid, byte[] encodedKeyValue, byte[] encodedParameters, ICertificatePal certificatePal)
{
if (oid.Value == Oids.EcPublicKey && certificatePal != null)
{
return(DecodeECDsaPublicKey((CertificatePal)certificatePal));
}
int algId = Interop.Crypt32.FindOidInfo(CryptOidInfoKeyType.CRYPT_OID_INFO_OID_KEY, oid.Value, OidGroup.PublicKeyAlgorithm, fallBackToAllGroups: true).AlgId;
switch (algId)
{
case AlgId.CALG_RSA_KEYX:
case AlgId.CALG_RSA_SIGN:
{
byte[] keyBlob = DecodeKeyBlob(CryptDecodeObjectStructType.CNG_RSA_PUBLIC_KEY_BLOB, encodedKeyValue);
CngKey cngKey = CngKey.Import(keyBlob, CngKeyBlobFormat.GenericPublicBlob);
return(new RSACng(cngKey));
}
//begin: gost
case AlgId.CALG_GOST3410:
{
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(encodedParameters);
cspObject.DecodePublicKey(encodedKeyValue, algId);
var cspBlobData = GostKeyExchangeParameters.EncodePublicBlob(cspObject, algId);
Gost3410CryptoServiceProvider gost_sp = new Gost3410CryptoServiceProvider();
gost_sp.ImportCspBlob(cspBlobData);
return(gost_sp);
}
case AlgId.CALG_GOST3410_2012_256:
{
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(encodedParameters);
cspObject.DecodePublicKey(encodedKeyValue, algId);
var cspBlobData = GostKeyExchangeParameters.EncodePublicBlob(cspObject, algId);
Gost3410_2012_256CryptoServiceProvider gost_sp = new Gost3410_2012_256CryptoServiceProvider();
gost_sp.ImportCspBlob(cspBlobData);
return(gost_sp);
}
case AlgId.CALG_GOST3410_2012_512:
{
var cspObject = new GostKeyExchangeParameters();
cspObject.DecodeParameters(encodedParameters);
cspObject.DecodePublicKey(encodedKeyValue, algId);
var cspBlobData = GostKeyExchangeParameters.EncodePublicBlob(cspObject, algId);
Gost3410_2012_512CryptoServiceProvider gost_sp = new Gost3410_2012_512CryptoServiceProvider();
gost_sp.ImportCspBlob(cspBlobData);
return(gost_sp);
}
//end: gost
case AlgId.CALG_DSS_SIGN:
{
byte[] keyBlob = ConstructDSSPublicKeyCspBlob(encodedKeyValue, encodedParameters);
DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();
dsa.ImportCspBlob(keyBlob);
return(dsa);
}
default:
throw new NotSupportedException(SR.NotSupported_KeyAlgorithm);
}
}
