/// <summary>
/// Initializes a new instance of the <see cref="RC4CryptoServiceProvider"/> class.
/// </summary>
/// <exception cref="CryptographicException">An error occurs while acquiring the CSP.</exception>
public RC4CryptoServiceProvider()
{
// acquire an RC4 context
m_Provider = CryptoHandle.Handle;
if (m_Provider != IntPtr.Zero)
{
int dwFlags = NativeMethods.CRYPT_FIRST;
bool found = false;
IntPtr provEnum = Marshal.AllocHGlobal(100);
int dwSize;
do
{
dwSize = 100;
if (NativeMethods.CryptGetProvParam(m_Provider, NativeMethods.PP_ENUMALGS_EX, provEnum, ref dwSize, dwFlags) == 0)
{
break;
}
dwFlags = 0;
PROV_ENUMALGS_EX eax = (PROV_ENUMALGS_EX)Marshal.PtrToStructure(provEnum, typeof(PROV_ENUMALGS_EX));
if (eax.aiAlgid == NativeMethods.CALG_RC4)
{
found = true;
m_MinLen = eax.dwMinLen;
m_MaxLen = eax.dwMaxLen;
}
} while (!found);
Marshal.FreeHGlobal(provEnum);
}
m_Managed = new ARCFourManaged();
}
/// <summary>
/// Initializes a new instance of the <see cref="RC4CryptoServiceProvider"/> class.
/// </summary>
public RC4CryptoServiceProvider()
{
// acquire an RC4 context
m_Provider = CAPIProvider.Handle;
/* if (SspiProvider.CryptAcquireContext(ref m_Provider, IntPtr.Zero, null, SecurityConstants.PROV_RSA_FULL, 0) == 0) {
* if (Marshal.GetLastWin32Error() == SecurityConstants.NTE_BAD_KEYSET)
* SspiProvider.CryptAcquireContext(ref m_Provider, IntPtr.Zero, null, SecurityConstants.PROV_RSA_FULL, SecurityConstants.CRYPT_NEWKEYSET);
* }*/
if (m_Provider != 0)
{
int dwFlags = SecurityConstants.CRYPT_FIRST;
bool found = false;
IntPtr provEnum = Marshal.AllocHGlobal(100);
int dwSize;
do
{
dwSize = 100;
if (SspiProvider.CryptGetProvParam(m_Provider, SecurityConstants.PP_ENUMALGS_EX, provEnum, ref dwSize, dwFlags) == 0)
{
break;
}
dwFlags = 0;
PROV_ENUMALGS_EX eax = (PROV_ENUMALGS_EX)Marshal.PtrToStructure(provEnum, typeof(PROV_ENUMALGS_EX));
if (eax.aiAlgid == SecurityConstants.CALG_RC4)
{
found = true;
m_MinLen = eax.dwMinLen;
m_MaxLen = eax.dwMaxLen;
}
} while (!found);
Marshal.FreeHGlobal(provEnum);
/* if (!found) {
* SspiProvider.CryptReleaseContext(m_Provider, 0);
* m_Provider = 0;
* }*/
}
m_Managed = new ARCFourManaged();
}
