internal static byte[] GetHashParameter(SafeCapiHashHandle hashHandle, HashParameter parameter)
{
int pdwDataLen = 0;
if (!UnsafeNativeMethods.CryptGetHashParam(hashHandle, parameter, null, ref pdwDataLen, 0))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
byte[] pbData = new byte[pdwDataLen];
if (!UnsafeNativeMethods.CryptGetHashParam(hashHandle, parameter, pbData, ref pdwDataLen, 0))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
if (pdwDataLen != pbData.Length)
{
byte[] dst = new byte[pdwDataLen];
Buffer.BlockCopy(pbData, 0, dst, 0, pdwDataLen);
pbData = dst;
}
return(pbData);
}
public static extern bool CryptGetHashParam(SafeCapiHashHandle hHash,
HashParameter dwParam,
[Out, MarshalAs(UnmanagedType.LPArray)] byte[] pbData,
[In, Out] ref int pdwDataLen,
int dwFlags);
internal static extern bool CryptSetHashParam(
SafeCryptoHashHandle hash,
HashParameter paramter,
[In, Out] ref HMAC_INFO hmacInfo,
uint flags
);
/// <summary>
/// Gets the hash parameter. This method wraps the underlying
/// api to obtain the length of the result and appropriately
/// size a result byte buffer.
/// </summary>
///
/// <param name="hashHandle">
/// The hash handle.
/// </param>
///
/// <param name="hashParameter">
/// The hash parameter.
/// </param>
///
/// <returns>
/// <c>true</c> if successful, otherwise <c>false</c>.
/// </returns>
internal static byte[] GetHashParameterWrapper(
SafeCryptoHashHandle hashHandle,
HashParameter hashParameter)
{
int hashLength = 0;
if (!UnsafeNativeMethods.CryptGetHashParam(
hashHandle, hashParameter, null, ref hashLength, 0))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
byte[] hash = new byte[hashLength];
if (!UnsafeNativeMethods.CryptGetHashParam(
hashHandle, hashParameter, hash, ref hashLength, 0))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
return hash;
}
internal static extern bool CryptGetHashParam(
SafeCryptoHashHandle hash,
HashParameter hashParameter,
[Out, MarshalAs(UnmanagedType.LPArray)] byte[] hashValue,
[In, Out] ref int length,
int flags);