public static SafeKeyHandleImpl GenerateKey(SafeProvHandleImpl providerHandle, int algId, CspProviderFlags flags)
{
var keyHandle = SafeKeyHandleImpl.InvalidHandle;
var dwFlags = MapCspKeyFlags(flags);
if (!CryptoApi.CryptGenKey(providerHandle, (uint)algId, dwFlags, ref keyHandle))
{
throw CreateWin32Error();
}
return(keyHandle);
}
public static SafeKeyHandleImpl GenerateDhEphemeralKey(SafeProvHandleImpl providerHandle, int algId, string digestParamSet, string publicKeyParamSet)
{
var keyHandle = SafeKeyHandleImpl.InvalidHandle;
var dwFlags = MapCspKeyFlags(CspProviderFlags.NoFlags) | Constants.CRYPT_PREGEN;
if (!CryptoApi.CryptGenKey(providerHandle, (uint)algId, dwFlags, ref keyHandle))
{
throw CreateWin32Error();
}
SetKeyParameterString(keyHandle, Constants.KP_HASHOID, digestParamSet);
SetKeyParameterString(keyHandle, Constants.KP_DHOID, publicKeyParamSet);
SetKeyParameter(keyHandle, Constants.KP_X, null);
return(keyHandle);
}
public static SafeKeyHandleImpl ImportBulkSessionKey(ProviderType providerType, SafeProvHandleImpl providerHandle, byte[] bulkSessionKey, RNGCryptoServiceProvider randomNumberGenerator)
{
if (bulkSessionKey == null)
{
throw ExceptionUtility.ArgumentNull(nameof(bulkSessionKey));
}
if (randomNumberGenerator == null)
{
throw ExceptionUtility.ArgumentNull(nameof(randomNumberGenerator));
}
var hSessionKey = SafeKeyHandleImpl.InvalidHandle;
if (!CryptoApi.CryptGenKey(providerHandle, Constants.CALG_G28147, 0, ref hSessionKey))
{
throw CreateWin32Error();
}
var keyWrap = new Gost_28147_89_KeyExchangeInfo {
EncryptedKey = new byte[32]
};
Array.Copy(bulkSessionKey, keyWrap.EncryptedKey, 32);
SetKeyParameterInt32(hSessionKey, Constants.KP_MODE, Constants.CRYPT_MODE_ECB);
SetKeyParameterInt32(hSessionKey, Constants.KP_ALGID, Constants.CALG_G28147);
SetKeyParameterInt32(hSessionKey, Constants.KP_PADDING, Constants.ZERO_PADDING);
uint sessionKeySize = 32;
if (!CryptoApi.CryptEncrypt(hSessionKey, SafeHashHandleImpl.InvalidHandle, true, 0, keyWrap.EncryptedKey, ref sessionKeySize, sessionKeySize))
{
throw CreateWin32Error();
}
SetKeyParameterInt32(hSessionKey, Constants.KP_MODE, Constants.CRYPT_MODE_CFB);
var hashHandle = CreateHashImit(providerHandle, hSessionKey);
keyWrap.Ukm = new byte[8];
randomNumberGenerator.GetBytes(keyWrap.Ukm);
if (!CryptoApi.CryptSetHashParam(hashHandle, Constants.HP_HASHSTARTVECT, keyWrap.Ukm, 0))
{
throw CreateWin32Error();
}
if (!CryptoApi.CryptHashData(hashHandle, bulkSessionKey, 32, 0))
{
throw CreateWin32Error();
}
keyWrap.Mac = EndHashData(hashHandle);
keyWrap.EncryptionParamSet = GetKeyParameterString(hSessionKey, Constants.KP_CIPHEROID);
SetKeyExchangeExportAlgId(providerType, hSessionKey, Constants.CALG_SIMPLE_EXPORT);
SetKeyParameterInt32(hSessionKey, Constants.KP_MODE, Constants.CRYPT_MODE_ECB);
SetKeyParameterInt32(hSessionKey, Constants.KP_PADDING, Constants.ZERO_PADDING);
return(ImportKeyExchange(providerHandle, keyWrap, hSessionKey));
}
