public void SignMessage(byte[] message, bool bUseClientContext, out byte[] signedBuffer,
ref SECURITY_HANDLE hServerContext)
{
signedBuffer = null;
SECURITY_HANDLE encryptionContext = _hServerContext;
if (bUseClientContext)
{
encryptionContext = _hClientContext;
}
SecPkgContext_Sizes contextSizes;
int result = NativeMethods.QueryContextAttributes(ref encryptionContext, NativeContants.SECPKG_ATTR_SIZES,
out contextSizes);
if (result != NativeContants.SEC_E_OK)
{
throw new SspiException("QueryContextAttribute() failed!!!", result);
}
var thisSecHelper = new MultipleSecBufferHelper[2];
thisSecHelper[0] = new MultipleSecBufferHelper(message, SecBufferType.SECBUFFER_DATA);
thisSecHelper[1] = new MultipleSecBufferHelper(new byte[contextSizes.cbMaxSignature],
SecBufferType.SECBUFFER_TOKEN);
var descBuffer = new SecBufferDesc(thisSecHelper);
try
{
result = NativeMethods.MakeSignature(ref encryptionContext, 0, ref descBuffer, 0);
if (result != NativeContants.SEC_E_OK)
{
throw new SspiException("MakeSignature() failed!!!", result);
}
//SSPIHelper.SignAndVerify(ref _hClientContext,ref hServerContext,ref DescBuffer);
uint encryptionQuality;
NativeMethods.VerifySignature(ref _hServerContext, ref descBuffer, 0, out encryptionQuality);
signedBuffer = descBuffer.GetSecBufferByteArray();
}
finally
{
descBuffer.Dispose();
}
}
public void VerifyMessage(int messageLength, byte[] signedBuffer, bool bUseClientContext,
out byte[] verifiedBuffer)
{
verifiedBuffer = null;
SECURITY_HANDLE decryptionContext = _hServerContext;
if (bUseClientContext)
{
decryptionContext = _hClientContext;
}
var signedMessage = new byte[messageLength];
Array.Copy(signedBuffer, 0, signedMessage, 0, messageLength);
int signatureLength = signedBuffer.Length - messageLength;
var signature = new byte[signatureLength];
Array.Copy(signedBuffer, messageLength, signature, 0, signatureLength);
var thisSecHelper = new MultipleSecBufferHelper[2];
thisSecHelper[0] = new MultipleSecBufferHelper(signedMessage, SecBufferType.SECBUFFER_DATA);
thisSecHelper[1] = new MultipleSecBufferHelper(signature, SecBufferType.SECBUFFER_TOKEN);
var descBuffer = new SecBufferDesc(thisSecHelper);
try
{
uint encryptionQuality;
int result = NativeMethods.VerifySignature(ref decryptionContext, ref descBuffer, 0,
out encryptionQuality);
if (result != NativeContants.SEC_E_OK)
{
throw new SspiException("VerifySignature() failed!!!", result);
}
verifiedBuffer = new byte[messageLength];
Array.Copy(descBuffer.GetSecBufferByteArray(), 0, verifiedBuffer, 0, messageLength);
}
finally
{
descBuffer.Dispose();
}
}
public void EncryptMessage(
byte[] message, bool bUseClientContext, out byte[] encryptedBuffer)
{
encryptedBuffer = null;
SECURITY_HANDLE encryptionContext = _hServerContext;
if (bUseClientContext)
{
encryptionContext = _hClientContext;
}
SecPkgContext_Sizes contextSizes;
int result = NativeMethods.QueryContextAttributes(ref encryptionContext, NativeContants.SECPKG_ATTR_SIZES,
out contextSizes);
if (result != NativeContants.SEC_E_OK)
{
throw new SspiException("QueryContextAttribute() failed!!!", result);
}
var thisSecHelper = new MultipleSecBufferHelper[2];
thisSecHelper[0] = new MultipleSecBufferHelper(message, SecBufferType.SECBUFFER_DATA);
thisSecHelper[1] = new MultipleSecBufferHelper(new byte[contextSizes.cbSecurityTrailer],
SecBufferType.SECBUFFER_TOKEN);
var descBuffer = new SecBufferDesc(thisSecHelper);
try
{
result = NativeMethods.EncryptMessage(ref encryptionContext, 0, ref descBuffer, 0);
if (result != NativeContants.SEC_E_OK)
{
throw new SspiException("EncryptMessage() failed!!!", result);
}
encryptedBuffer = descBuffer.GetSecBufferByteArray();
}
finally
{
descBuffer.Dispose();
}
}