| public C_DigestUpdate ( uint session, byte part, uint partLen ) : CKR | ||
| session | uint | The session's handle |
| part | byte | Data part |
| partLen | uint | The length of the data part |
| return | CKR | |
public void _02_DigestMultiPartTest()
{
if (Platform.UnmanagedLongSize != 4 || Platform.StructPackingSize != 0)
Assert.Inconclusive("Test cannot be executed on this platform");
CKR rv = CKR.CKR_OK;
using (Pkcs11 pkcs11 = new Pkcs11(Settings.Pkcs11LibraryPath))
{
rv = pkcs11.C_Initialize(Settings.InitArgs40);
if ((rv != CKR.CKR_OK) && (rv != CKR.CKR_CRYPTOKI_ALREADY_INITIALIZED))
Assert.Fail(rv.ToString());
// Find first slot with token present
uint slotId = Helpers.GetUsableSlot(pkcs11);
uint session = CK.CK_INVALID_HANDLE;
rv = pkcs11.C_OpenSession(slotId, (CKF.CKF_SERIAL_SESSION | CKF.CKF_RW_SESSION), IntPtr.Zero, IntPtr.Zero, ref session);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Specify digesting mechanism (needs no parameter => no unamanaged memory is needed)
CK_MECHANISM mechanism = CkmUtils.CreateMechanism(CKM.CKM_SHA_1);
byte[] sourceData = ConvertUtils.Utf8StringToBytes("Hello world");
byte[] digest = null;
// Multipart digesting functions C_DigestUpdate and C_DigestFinal can be used i.e. for digesting of streamed data
using (MemoryStream inputStream = new MemoryStream(sourceData))
{
// Initialize digesting operation
rv = pkcs11.C_DigestInit(session, ref mechanism);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Prepare buffer for source data part
// Note that in real world application we would rather use bigger buffer i.e. 4096 bytes long
byte[] part = new byte[8];
// Read input stream with source data
int bytesRead = 0;
while ((bytesRead = inputStream.Read(part, 0, part.Length)) > 0)
{
// Digest each individual source data part
rv = pkcs11.C_DigestUpdate(session, part, Convert.ToUInt32(bytesRead));
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
}
// Get length of digest value in first call
uint digestLen = 0;
rv = pkcs11.C_DigestFinal(session, null, ref digestLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
Assert.IsTrue(digestLen > 0);
// Allocate array for digest value
digest = new byte[digestLen];
// Get digest value in second call
rv = pkcs11.C_DigestFinal(session, digest, ref digestLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
}
// Do something interesting with digest value
rv = pkcs11.C_CloseSession(session);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
rv = pkcs11.C_Finalize(IntPtr.Zero);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
}
}