internal static SafeCspHashHandle CreateHashAlgorithm(SafeCspHandle cspHandle, CapiNative.AlgorithmID algorithm)
{
SafeCspHashHandle phHash = (SafeCspHashHandle)null;
if (!CapiNative.UnsafeNativeMethods.CryptCreateHash(cspHandle, algorithm, IntPtr.Zero, 0, out phHash))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
return(phHash);
}
internal static bool VerifySignature(SafeCspHandle cspHandle, SafeCspKeyHandle keyHandle, CapiNative.AlgorithmID signatureAlgorithm, CapiNative.AlgorithmID hashAlgorithm, byte[] hashValue, byte[] signature)
{
byte[] numArray = new byte[signature.Length];
Array.Copy((Array)signature, (Array)numArray, numArray.Length);
Array.Reverse((Array)numArray);
using (SafeCspHashHandle hashAlgorithm1 = CapiNative.CreateHashAlgorithm(cspHandle, hashAlgorithm))
{
if (hashValue.Length != CapiNative.GetHashPropertyInt32(hashAlgorithm1, CapiNative.HashProperty.HashSize))
{
throw new CryptographicException(-2146893822);
}
CapiNative.SetHashProperty(hashAlgorithm1, CapiNative.HashProperty.HashValue, hashValue);
SafeCspHashHandle hHash = hashAlgorithm1;
byte[] pbSignature = numArray;
int length = pbSignature.Length;
SafeCspKeyHandle hPubKey = keyHandle;
// ISSUE: variable of the null type
__Null local = null;
int dwFlags = 0;
if (CapiNative.UnsafeNativeMethods.CryptVerifySignature(hHash, pbSignature, length, hPubKey, (string)local, dwFlags))
{
return(true);
}
int lastWin32Error = Marshal.GetLastWin32Error();
if (lastWin32Error != -2146893818)
{
throw new CryptographicException(lastWin32Error);
}
return(false);
}
}
internal static extern bool CryptCreateHash(SafeCspHandle hProv, CapiNative.AlgorithmID Algid, IntPtr hKey, int dwFlags, out SafeCspHashHandle phHash);
internal static bool VerifySignature(SafeCspHandle cspHandle, SafeCspKeyHandle keyHandle, CapiNative.AlgorithmID signatureAlgorithm, CapiNative.AlgorithmID hashAlgorithm, byte[] hashValue, byte[] signature)
{
byte[] array = new byte[signature.Length];
Array.Copy(signature, array, array.Length);
Array.Reverse(array);
bool result;
using (SafeCspHashHandle safeCspHashHandle = CapiNative.CreateHashAlgorithm(cspHandle, hashAlgorithm))
{
if (hashValue.Length != CapiNative.GetHashPropertyInt32(safeCspHashHandle, CapiNative.HashProperty.HashSize))
{
throw new CryptographicException(-2146893822);
}
CapiNative.SetHashProperty(safeCspHashHandle, CapiNative.HashProperty.HashValue, hashValue);
if (CapiNative.UnsafeNativeMethods.CryptVerifySignature(safeCspHashHandle, array, array.Length, keyHandle, null, 0))
{
result = true;
}
else
{
int lastWin32Error = Marshal.GetLastWin32Error();
if (lastWin32Error != -2146893818)
{
throw new CryptographicException(lastWin32Error);
}
result = false;
}
}
return(result);
}
