internal static extern ErrorCode BCryptCreateHash(SafeBCryptAlgorithmHandle hAlgorithm,
[Out] out SafeBCryptHashHandle phHash,
IntPtr pbHashObject,
int cbHashObject,
IntPtr pbSecret,
int cbSecret,
int dwFlags);
public void Dispose()
{
Contract.Ensures(m_hashHandle == null || m_hashHandle.IsClosed);
Contract.Ensures(m_algorithmHandle == null || m_algorithmHandle.IsClosed);
if (m_hashHandle != null)
{
m_hashHandle.Dispose();
}
if (m_algorithmHandle != null)
{
m_algorithmHandle = null;
}
}
public BCryptHashAlgorithm(CngAlgorithm algorithm, string implementation)
{
Contract.Requires(algorithm != null);
Contract.Requires(!String.IsNullOrEmpty(implementation));
Contract.Ensures(m_algorithmHandle != null && !m_algorithmHandle.IsInvalid && !m_algorithmHandle.IsClosed);
Contract.Ensures(m_hashHandle != null && !m_hashHandle.IsInvalid && !m_hashHandle.IsClosed);
if (_algorithmCache == null)
{
_algorithmCache = new BCryptAlgorithmHandleCache();
}
m_algorithmHandle = _algorithmCache.GetCachedAlgorithmHandle(algorithm.Algorithm, implementation);
Initialize();
}
public SafeBCryptAlgorithmHandle GetCachedAlgorithmHandle(string algorithm, string implementation)
{
string handleKey = algorithm + implementation;
SafeBCryptAlgorithmHandle algorithmHandle = null;
if (m_algorithmHandles.ContainsKey(handleKey))
{
algorithmHandle = m_algorithmHandles[handleKey].Target as SafeBCryptAlgorithmHandle;
if (algorithmHandle != null)
{
return(algorithmHandle);
}
}
algorithmHandle = BCryptNative.OpenAlgorithm(algorithm, implementation);
m_algorithmHandles[handleKey] = new WeakReference(algorithmHandle);
return(algorithmHandle);
}
internal static SafeBCryptAlgorithmHandle OpenAlgorithm(string algorithm, string implementation)
{
Contract.Requires(!String.IsNullOrEmpty(algorithm));
Contract.Requires(!String.IsNullOrEmpty(implementation));
Contract.Ensures(Contract.Result <SafeBCryptAlgorithmHandle>() != null &&
!Contract.Result <SafeBCryptAlgorithmHandle>().IsInvalid&&
!Contract.Result <SafeBCryptAlgorithmHandle>().IsClosed);
SafeBCryptAlgorithmHandle algorithmHandle = null;
ErrorCode error = UnsafeNativeMethods.BCryptOpenAlgorithmProvider(out algorithmHandle,
algorithm,
implementation,
0);
if (error != ErrorCode.Success)
{
throw new CryptographicException((int)error);
}
return(algorithmHandle);
}
internal static extern ErrorCode BCryptOpenAlgorithmProvider([Out] out SafeBCryptAlgorithmHandle phAlgorithm,
string pszAlgId, // BCryptAlgorithm
string pszImplementation, // ProviderNames
int dwFlags);
internal static extern ErrorCode BCryptGetAlgorithmProperty(SafeBCryptAlgorithmHandle hObject,
string pszProperty,
[MarshalAs(UnmanagedType.LPArray), In, Out] byte[] pbOutput,
int cbOutput,
[In, Out] ref int pcbResult,
int flags);
