public void EncryptMessage(byte[] message, out byte[] encryptedBuffer)
{
encryptedBuffer = null;
SECURITY_HANDLE EncryptionContext = _hClientContext;
SecPkgContext_Sizes ContextSizes;
if (QueryContextAttributes(ref EncryptionContext,
SECPKG_ATTR_SIZES, out ContextSizes) != SEC_E_OK)
{
throw new Exception("QueryContextAttribute() failed!!!");
}
MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[]
{
new MultipleSecBufferHelper(new byte[ContextSizes.cbSecurityTrailer],
SecBufferType.SECBUFFER_TOKEN),
new MultipleSecBufferHelper(message, SecBufferType.SECBUFFER_DATA),
new MultipleSecBufferHelper(new byte[ContextSizes.cbBlockSize],
SecBufferType.SECBUFFER_PADDING)
};
SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);
try
{
if (EncryptMessage(ref EncryptionContext,
SECQOP_WRAP_NO_ENCRYPT, ref DescBuffer, 0) != SEC_E_OK)
{
throw new Exception("EncryptMessage() failed!!!");
}
encryptedBuffer = DescBuffer.GetSecBufferByteArray();
}
finally
{
DescBuffer.Dispose();
}
}
public void DecryptMessage(int messageLength, byte[] encryptedBuffer, out byte[] decryptedBuffer)
{
decryptedBuffer = null;
SECURITY_HANDLE DecryptionContext = _hClientContext;
byte[] EncryptedMessage = new byte[messageLength];
Array.Copy(encryptedBuffer, 0, EncryptedMessage, 0, messageLength);
int SecurityTrailerLength = encryptedBuffer.Length - messageLength;
byte[] SecurityTrailer = new byte[SecurityTrailerLength];
Array.Copy(encryptedBuffer, messageLength, SecurityTrailer, 0, SecurityTrailerLength);
MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[]
{
new MultipleSecBufferHelper(EncryptedMessage, SecBufferType.SECBUFFER_DATA),
new MultipleSecBufferHelper(SecurityTrailer, SecBufferType.SECBUFFER_STREAM)
};
SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);
try
{
uint EncryptionQuality;
if (DecryptMessage(ref DecryptionContext, ref DescBuffer, 0, out EncryptionQuality) != SEC_E_OK)
{
throw new Exception("DecryptMessage() failed!!!");
}
decryptedBuffer = new byte[messageLength];
Array.Copy(DescBuffer.GetSecBufferByteArray(), 0, decryptedBuffer, 0, messageLength);
}
finally
{
DescBuffer.Dispose();
}
}
