internal static extern ErrorCode BCryptCreateHash(SafeBCryptAlgorithmHandle hAlgorithm,
[Out] out SafeBCryptHashHandle hHash,
IntPtr pbHashObject, // byte *
int cbHashObject,
[In, MarshalAs(UnmanagedType.LPArray)] byte[] pbSecret,
int cbSecret,
int dwFlags);
internal static SafeBCryptHashHandle CreateHash(SafeBCryptAlgorithmHandle algorithm,
byte[] secret)
{
Debug.Assert(algorithm != null, "algorithm != null");
Debug.Assert(!algorithm.IsClosed && !algorithm.IsInvalid, "!algorithm.IsClosed && !algorithm.IsInvalid");
IntPtr hashObject = IntPtr.Zero;
SafeBCryptHashHandle hash = null;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
// Figure out how big of a buffer is needed for the hash object and allocate it
int hashObjectSize = GetInt32Property(algorithm, ObjectPropertyName.ObjectLength);
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally
{
hashObject = Marshal.AllocCoTaskMem(hashObjectSize);
}
// Create the hash object
ErrorCode error = UnsafeNativeMethods.BCryptCreateHash(algorithm,
out hash,
hashObject,
hashObjectSize,
secret,
secret != null ? secret.Length : 0,
0);
if (error != ErrorCode.Success)
{
throw new CryptographicException((int)error);
}
// Transfer ownership of the buffer to the safe handle
hash.DataBuffer = hashObject;
return(hash);
}
finally
{
// If the safe hash handle never took ownership of the data buffer, free it now.
if (hashObject != IntPtr.Zero)
{
if (hash == null || hash.DataBuffer == IntPtr.Zero)
{
Marshal.FreeCoTaskMem(hashObject);
}
}
}
}
internal static void HashData(SafeBCryptHashHandle hash, byte[] data)
{
Debug.Assert(hash != null, "hash != null");
Debug.Assert(!hash.IsClosed && !hash.IsInvalid, "!hash.IsClosed && !hash.IsInvalid");
Debug.Assert(data != null, "data != null");
ErrorCode error = UnsafeNativeMethods.BCryptHashData(hash, data, data.Length, 0);
if (error != ErrorCode.Success)
{
throw new CryptographicException((int)error);
}
}
public override void Initialize()
{
Debug.Assert(m_algorithm != null, "m_algorithm != null");
base.Initialize();
// If we have a previously used hash handle, we can clean it up now
if (m_hash != null)
{
m_hash.Dispose();
}
m_hash = BCryptNative.CreateHash(m_algorithm, KeyValue);
// We're allowed to reset the key at this point
State = 0;
}
internal static byte[] FinishHash(SafeBCryptHashHandle hash)
{
Debug.Assert(hash != null, "hash != null");
Debug.Assert(!hash.IsClosed && !hash.IsInvalid, "!hash.IsClosed && !hash.IsInvalid");
int hashSize = GetInt32Property(hash, HashPropertyName.HashLength);
byte[] result = new byte[hashSize];
ErrorCode error = UnsafeNativeMethods.BCryptFinishHash(hash, result, result.Length, 0);
if (error != ErrorCode.Success)
{
throw new CryptographicException((int)error);
}
return(result);
}
internal static extern ErrorCode BCryptSetHashProperty(SafeBCryptHashHandle hObject,
[MarshalAs(UnmanagedType.LPWStr)] string pszProperty,
[In, MarshalAs(UnmanagedType.LPArray)] byte[] pbInput,
int cbInput,
int dwFlags);
internal static extern ErrorCode BCryptHashData(SafeBCryptHashHandle hHash,
[In, MarshalAs(UnmanagedType.LPArray)] byte[] pbInput,
int cbInput,
int dwFlags);
internal static extern ErrorCode BCryptGetHashProperty(SafeBCryptHashHandle hObject,
[MarshalAs(UnmanagedType.LPWStr)] string pszProperty,
[In, Out, MarshalAs(UnmanagedType.LPArray)] byte[] pbOutput,
int cbOutput,
[In, Out] ref int pcbResult,
int flags);
internal static extern ErrorCode BCryptFinishHash(SafeBCryptHashHandle hHash,
[Out, MarshalAs(UnmanagedType.LPArray)] byte[] pbOutput,
int cbOutput,
int dwFlags);
