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();
}
}
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();
}
}
internal SecBufferDesc(MultipleSecBufferHelper[] secBufferBytesArray)
{
if (secBufferBytesArray == null || secBufferBytesArray.Length == 0)
{
throw new ArgumentException("secBufferBytesArray cannot be null or 0 length");
}
ulVersion = (int)SecBufferType.SECBUFFER_VERSION;
cBuffers = secBufferBytesArray.Length;
//Allocate memory for SecBuffer Array....
pBuffers = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(SecBuffer)) * cBuffers);
for (int Index = 0; Index < secBufferBytesArray.Length; Index++)
{
//Super hack: Now allocate memory for the individual SecBuffers
//and just copy the bit values to the SecBuffer array!!!
SecBuffer ThisSecBuffer = new SecBuffer(secBufferBytesArray[Index].Buffer,
secBufferBytesArray[Index].BufferType);
//We will write out bits in the following order:
//int cbBuffer;
//int BufferType;
//pvBuffer;
//Note: that we won't be releasing the memory allocated by ThisSecBuffer until we
//are disposed...
int CurrentOffset = Index * Marshal.SizeOf(typeof(SecBuffer));
Marshal.WriteInt32(pBuffers, CurrentOffset, ThisSecBuffer.cbBuffer);
int length = CurrentOffset + Marshal.SizeOf(ThisSecBuffer.cbBuffer);
Marshal.WriteInt32(pBuffers, length, ThisSecBuffer.BufferType);
length = CurrentOffset + Marshal.SizeOf(ThisSecBuffer.cbBuffer) +
Marshal.SizeOf(ThisSecBuffer.BufferType);
Marshal.WriteIntPtr(pBuffers, length, ThisSecBuffer.pvBuffer);
}
}
