/// <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>
/// <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();
}
private void Dispose()
{
if (!m_Disposed) {
m_Disposed = true;
if (m_Managed != null) {
m_Managed.Clear();
m_Managed = null;
}
GC.SuppressFinalize(this);
}
}
