public C_DigestUpdate ( ulong session, byte part, ulong partLen ) : CKR | ||
session | ulong | The session's handle |
part | byte | Data part |
partLen | ulong | The length of the data part |
Результат | CKR |
public void _02_DigestMultiPartTest() { if (Platform.UnmanagedLongSize != 8 || Platform.StructPackingSize != 1) 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.InitArgs81); if ((rv != CKR.CKR_OK) && (rv != CKR.CKR_CRYPTOKI_ALREADY_INITIALIZED)) Assert.Fail(rv.ToString()); // Find first slot with token present ulong slotId = Helpers.GetUsableSlot(pkcs11); ulong 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.ToUInt64(bytesRead)); if (rv != CKR.CKR_OK) Assert.Fail(rv.ToString()); } // Get length of digest value in first call ulong 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()); } }