| public C_DecryptFinal ( ulong session, byte lastPart, ulong &lastPartLen ) : CKR | ||
| session | ulong | The session's handle |
| lastPart | byte | /// If set to null then the length of last decrypted data part is returned in "lastPartLen" parameter, without actually returning last decrypted data part. /// If not set to null then "lastPartLen" parameter must contain the lenght of lastPart array and last decrypted data part is returned in "lastPart" parameter. /// |
| lastPartLen | ulong | Location that holds the length of the last decrypted data part |
| return | CKR | |
public void _01_BasicSignEncryptAndDecryptVerifyTest()
{
if (Platform.UnmanagedLongSize != 8 || 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.InitArgs80);
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());
// Login as normal user
rv = pkcs11.C_Login(session, CKU.CKU_USER, Settings.NormalUserPinArray, Convert.ToUInt64(Settings.NormalUserPinArray.Length));
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Generate asymetric key pair
ulong pubKeyId = CK.CK_INVALID_HANDLE;
ulong privKeyId = CK.CK_INVALID_HANDLE;
rv = Helpers.GenerateKeyPair(pkcs11, session, ref pubKeyId, ref privKeyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Specify signing mechanism (needs no parameter => no unamanaged memory is needed)
CK_MECHANISM signingMechanism = CkmUtils.CreateMechanism(CKM.CKM_SHA1_RSA_PKCS);
// Generate symetric key
ulong keyId = CK.CK_INVALID_HANDLE;
rv = Helpers.GenerateKey(pkcs11, session, ref keyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Generate random initialization vector
byte[] iv = new byte[8];
rv = pkcs11.C_GenerateRandom(session, iv, Convert.ToUInt64(iv.Length));
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Specify encryption mechanism with initialization vector as parameter.
// Note that CkmUtils.CreateMechanism() automaticaly copies iv into newly allocated unmanaged memory.
CK_MECHANISM encryptionMechanism = CkmUtils.CreateMechanism(CKM.CKM_DES3_CBC, iv);
byte[] sourceData = ConvertUtils.Utf8StringToBytes("Passw0rd");
byte[] signature = null;
byte[] encryptedData = null;
byte[] decryptedData = null;
// Multipart signing and encryption function C_SignEncryptUpdate can be used i.e. for signing and encryption of streamed data
using (MemoryStream inputStream = new MemoryStream(sourceData), outputStream = new MemoryStream())
{
// Initialize signing operation
rv = pkcs11.C_SignInit(session, ref signingMechanism, privKeyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Initialize encryption operation
rv = pkcs11.C_EncryptInit(session, ref encryptionMechanism, keyId);
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];
// Prepare buffer for encrypted data part
// Note that in real world application we would rather use bigger buffer i.e. 4096 bytes long
byte[] encryptedPart = new byte[8];
ulong encryptedPartLen = Convert.ToUInt64(encryptedPart.Length);
// Read input stream with source data
int bytesRead = 0;
while ((bytesRead = inputStream.Read(part, 0, part.Length)) > 0)
{
// Process each individual source data part
encryptedPartLen = Convert.ToUInt64(encryptedPart.Length);
rv = pkcs11.C_SignEncryptUpdate(session, part, Convert.ToUInt64(bytesRead), encryptedPart, ref encryptedPartLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Append encrypted data part to the output stream
outputStream.Write(encryptedPart, 0, Convert.ToInt32(encryptedPartLen));
}
// Get the length of signature in first call
ulong signatureLen = 0;
rv = pkcs11.C_SignFinal(session, null, ref signatureLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
Assert.IsTrue(signatureLen > 0);
// Allocate array for signature
signature = new byte[signatureLen];
// Get signature in second call
rv = pkcs11.C_SignFinal(session, signature, ref signatureLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Get the length of last encrypted data part in first call
byte[] lastEncryptedPart = null;
ulong lastEncryptedPartLen = 0;
rv = pkcs11.C_EncryptFinal(session, null, ref lastEncryptedPartLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Allocate array for the last encrypted data part
lastEncryptedPart = new byte[lastEncryptedPartLen];
// Get the last encrypted data part in second call
rv = pkcs11.C_EncryptFinal(session, lastEncryptedPart, ref lastEncryptedPartLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Append the last encrypted data part to the output stream
outputStream.Write(lastEncryptedPart, 0, Convert.ToInt32(lastEncryptedPartLen));
// Read whole output stream to the byte array so we can compare results more easily
encryptedData = outputStream.ToArray();
}
// Do something interesting with signature and encrypted data
// Multipart decryption and verification function C_DecryptVerifyUpdate can be used i.e. for decryption and signature verification of streamed data
using (MemoryStream inputStream = new MemoryStream(encryptedData), outputStream = new MemoryStream())
{
// Initialize decryption operation
rv = pkcs11.C_DecryptInit(session, ref encryptionMechanism, keyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Initialize verification operation
rv = pkcs11.C_VerifyInit(session, ref signingMechanism, pubKeyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Prepare buffer for encrypted data part
// Note that in real world application we would rather use bigger buffer i.e. 4096 bytes long
byte[] encryptedPart = new byte[8];
// Prepare buffer for decrypted data part
// Note that in real world application we would rather use bigger buffer i.e. 4096 bytes long
byte[] part = new byte[8];
ulong partLen = Convert.ToUInt64(part.Length);
// Read input stream with encrypted data
int bytesRead = 0;
while ((bytesRead = inputStream.Read(encryptedPart, 0, encryptedPart.Length)) > 0)
{
// Process each individual encrypted data part
partLen = Convert.ToUInt64(part.Length);
rv = pkcs11.C_DecryptVerifyUpdate(session, encryptedPart, Convert.ToUInt64(bytesRead), part, ref partLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Append decrypted data part to the output stream
outputStream.Write(part, 0, Convert.ToInt32(partLen));
}
// Get the length of last decrypted data part in first call
byte[] lastPart = null;
ulong lastPartLen = 0;
rv = pkcs11.C_DecryptFinal(session, null, ref lastPartLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Allocate array for the last decrypted data part
lastPart = new byte[lastPartLen];
// Get the last decrypted data part in second call
rv = pkcs11.C_DecryptFinal(session, lastPart, ref lastPartLen);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
// Append the last decrypted data part to the output stream
outputStream.Write(lastPart, 0, Convert.ToInt32(lastPartLen));
// Read whole output stream to the byte array so we can compare results more easily
decryptedData = outputStream.ToArray();
// Verify signature
rv = pkcs11.C_VerifyFinal(session, signature, Convert.ToUInt64(signature.Length));
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
}
// Do something interesting with decrypted data and verification result
Assert.IsTrue(Convert.ToBase64String(sourceData) == Convert.ToBase64String(decryptedData));
// In LowLevelAPI we have to free unmanaged memory taken by mechanism parameter (iv in this case)
UnmanagedMemory.Free(ref encryptionMechanism.Parameter);
encryptionMechanism.ParameterLen = 0;
rv = pkcs11.C_DestroyObject(session, privKeyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
rv = pkcs11.C_DestroyObject(session, pubKeyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
rv = pkcs11.C_DestroyObject(session, keyId);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
rv = pkcs11.C_Logout(session);
if (rv != CKR.CKR_OK)
Assert.Fail(rv.ToString());
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());
}
}