internal static SafeCspHandle AcquireCsp(string keyContainer,
string providerName,
ProviderType providerType,
CryptAcquireContextFlags flags,
bool throwPlatformException)
{
Contract.Ensures(Contract.Result <SafeCspHandle>() != null &&
!Contract.Result <SafeCspHandle>().IsInvalid&&
!Contract.Result <SafeCspHandle>().IsClosed);
SafeCspHandle cspHandle = null;
if (!UnsafeNativeMethods.CryptAcquireContext(out cspHandle,
keyContainer,
providerName,
providerType,
flags))
{
// If the platform doesn't have the specified CSP, we'll either get a ProviderTypeNotDefined
// or a KeysetNotDefined error depending on the CAPI version.
int error = Marshal.GetLastWin32Error();
if (throwPlatformException && (error == (int)CapiNative.ErrorCode.ProviderTypeNotDefined ||
error == (int)CapiNative.ErrorCode.KeysetNotDefined))
{
throw new PlatformNotSupportedException(SR.Cryptography_PlatformNotSupported);
}
else
{
throw new CryptographicException(error);
}
}
return(cspHandle);
}
/*
* SafeCritical - we're not exposing out anything that we want to prevent untrusted code from getting at
*/
public CapiHashAlgorithm(
string provider,
CapiNative.ProviderType providerType,
CapiNative.AlgorithmId algorithm)
{
Contract.Requires(!string.IsNullOrEmpty(provider));
Contract.Requires((CapiNative.AlgorithmClass)((uint)algorithm & (uint)CapiNative.AlgorithmClass.Hash) == CapiNative.AlgorithmClass.Hash);
m_algorithmId = algorithm;
m_cspHandle = CapiNative.AcquireCsp(null,
provider,
providerType,
CapiNative.CryptAcquireContextFlags.VerifyContext,
true);
m_hashHandle = Initialize();
}
internal void SetParentCsp(SafeCspHandle parentCsp)
{
bool addedRef = false;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
parentCsp.DangerousAddRef(ref addedRef);
IntPtr rawParentHandle = parentCsp.DangerousGetHandle();
ParentCsp = rawParentHandle;
}
finally
{
if (addedRef)
{
parentCsp.DangerousRelease();
}
}
}
public static extern bool CryptCreateHash(SafeCspHandle hProv,
AlgorithmId Algid,
SafeCapiKeyHandle hKey,
int dwFlags,
[Out] out SafeCapiHashHandle phHash);
public static extern bool CryptAcquireContext([Out] out SafeCspHandle phProv,
string?pszContainer,
string pszProvider,
ProviderType dwProvType,
CryptAcquireContextFlags dwFlags);
