internal static extern ErrorCode BCryptCreateHash(SafeBCryptAlgorithmHandle hAlgorithm,
[Out] out SafeBCryptHashHandle phHash,
IntPtr pbHashObject,
int cbHashObject,
IntPtr pbSecret,
int cbSecret,
int dwFlags);
internal LiteHash(string algorithm)
{
BCryptOpenAlgorithmProviderFlags algorithmFlags =
BCryptOpenAlgorithmProviderFlags.None;
// This is a shared handle, do not put this in a using.
SafeBCryptAlgorithmHandle algorithmHandle = Interop.BCrypt.BCryptAlgorithmCache.GetCachedBCryptAlgorithmHandle(
algorithm,
algorithmFlags,
out _hashSizeInBytes);
SafeBCryptHashHandle hashHandle;
NTSTATUS ntStatus = Interop.BCrypt.BCryptCreateHash(
algorithmHandle,
out hashHandle,
pbHashObject: IntPtr.Zero,
cbHashObject: 0,
secret: ReadOnlySpan <byte> .Empty,
cbSecret: 0,
BCryptCreateHashFlags.None);
if (ntStatus != NTSTATUS.STATUS_SUCCESS)
{
hashHandle.Dispose();
throw Interop.BCrypt.CreateCryptographicException(ntStatus);
}
_hashHandle = hashHandle;
}
public override int GetCurrentHash(Span <byte> destination)
{
Debug.Assert(destination.Length >= _hashSize);
Debug.Assert(_hHash != null);
using (SafeBCryptHashHandle tmpHash = Interop.BCrypt.BCryptDuplicateHash(_hHash))
{
NTSTATUS ntStatus = Interop.BCrypt.BCryptFinishHash(tmpHash, destination, _hashSize, 0);
if (ntStatus != NTSTATUS.STATUS_SUCCESS)
{
throw Interop.BCrypt.CreateCryptographicException(ntStatus);
}
return(_hashSize);
}
}
public void Initialize()
{
SafeBCryptHashHandle phHash = null;
IntPtr zero = IntPtr.Zero;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
int cb = BCryptNative.GetInt32Property <SafeBCryptAlgorithmHandle>(this.m_algorithmHandle, "ObjectLength");
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
zero = Marshal.AllocCoTaskMem(cb);
}
BCryptNative.ErrorCode code = BCryptNative.UnsafeNativeMethods.BCryptCreateHash(this.m_algorithmHandle, out phHash, zero, cb, IntPtr.Zero, 0, 0);
if (code != BCryptNative.ErrorCode.Success)
{
throw new CryptographicException((int)code);
}
phHash.HashObject = zero;
}
finally
{
if ((zero != IntPtr.Zero) && ((phHash == null) || (phHash.HashObject == IntPtr.Zero)))
{
Marshal.FreeCoTaskMem(zero);
}
}
if (this.m_hashHandle != null)
{
this.m_hashHandle.Dispose();
}
this.m_hashHandle = phHash;
}
internal static extern ErrorCode BCryptHashData(SafeBCryptHashHandle hHash,
[MarshalAs(UnmanagedType.LPArray), In] byte[] pbInput,
int cbInput,
int dwFlags);
internal static extern ErrorCode BCryptGetHashProperty(SafeBCryptHashHandle hObject,
string pszProperty,
[MarshalAs(UnmanagedType.LPArray), In, Out] byte[] pbOutput,
int cbOutput,
[In, Out] ref int pcbResult,
int flags);
internal static extern BCryptNative.ErrorCode BCryptFinishHash(SafeBCryptHashHandle hHash, [Out, MarshalAs(UnmanagedType.LPArray)] byte[] pbInput, int cbInput, int dwFlags);
public void Initialize()
{
Contract.Ensures(m_hashHandle != null && !m_hashHandle.IsInvalid && !m_hashHandle.IsClosed);
Contract.Assert(m_algorithmHandle != null);
// Try to create a new hash algorithm to use
SafeBCryptHashHandle newHashAlgorithm = null;
IntPtr hashObjectBuffer = IntPtr.Zero;
// Creating a BCRYPT_HASH_HANDLE requires providing a buffer to hold the hash object in, which
// is tied to the lifetime of the hash handle. Wrap this in a CER so we can tie the lifetimes together
// safely.
try
{
int hashObjectSize = BCryptNative.GetInt32Property(m_algorithmHandle,
BCryptNative.ObjectPropertyName.ObjectLength);
Debug.Assert(hashObjectSize > 0, "hashObjectSize > 0");
// Allocate in a CER because we could fail between the alloc and the assignment
try { }
finally
{
hashObjectBuffer = Marshal.AllocCoTaskMem(hashObjectSize);
}
BCryptNative.ErrorCode error = BCryptNative.UnsafeNativeMethods.BCryptCreateHash(m_algorithmHandle,
out newHashAlgorithm,
hashObjectBuffer,
hashObjectSize,
IntPtr.Zero,
0,
0);
if (error != BCryptNative.ErrorCode.Success)
{
throw new CryptographicException((int)error);
}
}
finally
{
// Make sure we've successfully transfered ownership of the hash object buffer to the safe handle
if (hashObjectBuffer != IntPtr.Zero)
{
// If we created the safe handle, it needs to own the buffer and free it in release
if (newHashAlgorithm != null)
{
newHashAlgorithm.HashObject = hashObjectBuffer;
}
else
{
Marshal.FreeCoTaskMem(hashObjectBuffer);
}
}
}
// If we could create it, dispose of any old hash handle we had and replace it with the new one
if (m_hashHandle != null)
{
m_hashHandle.Dispose();
}
m_hashHandle = newHashAlgorithm;
}
internal static extern unsafe ErrorCode BCryptHashData(SafeBCryptHashHandle hHash,
byte *pbInput,
int cbInput,
int dwFlags);
