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C# Tutorial

• Instanciate and Initialize a Cryptoki object
• Read available slots
• Open and Close a Session
• Login and Logout
• Search for some objects
• Create a Data object
• Create a Certificate object
• Generate a key pair
• Encrypt and decrypt
• Sign and Verify
  

1. Instanciate and Initialize a Cryptoki object¶

// Creates a Cryptoki object and attach it to the PKCS#11 native library smaoscki.dllCryptoki 
cryptoki = new Cryptoki("smaoscki.dll");
int nRet = cryptoki.Initialize();
if (nRet != 0)
{ 
    error(nRet);
}
...
cryptoki.Finalize(IntPtr.Zero);

2. Read available slots¶

// Reads the set of available slots
SlotList slots = cryptoki.Slots;
if (slots.Count == 0)
    throw new Exception("No slots available");

// Gets the first slot available
Slot slot = slots[0];

3. Open and Close a session¶

// Gets the first token available
if(!slot.IsTokenInserted)
{
    Console.WriteLine("No token found in the slot: " + slot.Info.Description);
    return;
}

Token token = slot.Token;

// Prints all information relating to the token
TokenInfo tinfo = token.Info;

Console.WriteLine(tinfo.Label);
Console.WriteLine(tinfo.ManufacturerID);
Console.WriteLine(tinfo.Model);
Console.WriteLine(tinfo.SerialNumber);
Console.WriteLine(tinfo.HardwareVersion);

// Opens a read/write serial session
Session session = token.OpenSession (Session.CKF_SERIAL_SESSION | Session.CKF_RW_SESSION, null, null);

...session.Close();

4. Login and Logout¶

// Executes the login passing the user PIN
int nRes = session.Login((int)Session.CKU_USER, "12345678");
if (nRes != 0)
{
    Console.WriteLine("Wrong PIN");
    return;
}

Console.WriteLine("Logged in:" + session.IsLoggedIn);

5. Search for some objects¶

// Searchs for an RSA private key object
// Sets the template with its attributes
CryptokiCollection template = new CryptokiCollection();
template.Add(new ObjectAttribute(ObjectAttribute.CKA_CLASS, CryptokiObject.CKO_PRIVATE_KEY));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_KEY_TYPE, Key.CKK_RSA));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_LABEL, "Ugo's new Key 0"));

// Launchs the search specifying the template just created
CryptokiCollection objects = session.Objects.Find(template, 10);

// If the private keys is found continue
if (objects.Count > 0)
{
    foreach (Object obj in objects)
    {
        Console.WriteLine(((PrivateKey)obj).Label);
    }
    
    RSAPrivateKey privateKey;
    privateKey = (RSAPrivateKey)objects[objects.Count - 1];
    Console.WriteLine(privateKey.Label);
}

6. Create a Data object¶

CryptokiCollection template = new CryptokiCollection();
template.Add(new ObjectAttribute(ObjectAttribute.CKA_CLASS, CryptokiObject.CKO_DATA));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_LABEL, label));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_APPLICATION, application));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_TOKEN, true));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_PRIVATE, true);
template.Add(new ObjectAttribute(ObjectAttribute.CKA_MODIFIABLE, true);
template.Add(new ObjectAttribute(ObjectAttribute.CKA_VALUE, value));

Data data = (Data)session.Objects.Create(template);

7. Create a Certificate object¶

CryptokiCollection template = new CryptokiCollection();
template.Add(new ObjectAttribute(ObjectAttribute.CKA_CLASS, CryptokiObject.CKO_CERTIFICATE));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_SUBJECT, cert.SubjectName.RawData));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_ISSUER, cert.Issuer));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_SERIAL_NUMBER, cert.SerialNumber));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_ID, id));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_LABEL, label));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_TOKEN, true));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_VALUE, cert.RawData));
template.Add(new ObjectAttribute(ObjectAttribute.CKA_MODIFIABLE, modifiable));

CryptokiObject certificate = CurrentSession.Objects.Create(template);

8. Generate a key pair¶

// Prepares the templates for key pair generation
CryptokiCollection templatePub = new CryptokiCollection();
templatePub.Add(new ObjectAttribute(ObjectAttribute.CKA_CLASS, CryptokiObject.CKO_PUBLIC_KEY));
templatePub.Add(new ObjectAttribute(ObjectAttribute.CKA_TOKEN, true));
templatePub.Add(new ObjectAttribute(ObjectAttribute.CKA_PRIVATE, false));
templatePub.Add(new ObjectAttribute(ObjectAttribute.CKA_LABEL, "Ugo's new Key"));
templatePub.Add(new ObjectAttribute(ObjectAttribute.CKA_ID, "1"));
templatePub.Add(new ObjectAttribute(ObjectAttribute.CKA_MODULUS_BITS, 1024));
templatePub.Add(new ObjectAttribute(ObjectAttribute.CKA_PUBLIC_EXPONENT, 0x010001));

CryptokiCollection templatePri = new CryptokiCollection();
templatePri.Add(new ObjectAttribute(ObjectAttribute.CKA_CLASS, CryptokiObject.CKO_PRIVATE_KEY));
templatePri.Add(new ObjectAttribute(ObjectAttribute.CKA_TOKEN, true));
templatePri.Add(new ObjectAttribute(ObjectAttribute.CKA_PRIVATE, true));
templatePri.Add(new ObjectAttribute(ObjectAttribute.CKA_LABEL, "Ugo's new Key 0"));
templatePri.Add(new ObjectAttribute(ObjectAttribute.CKA_ID, "1"));

//generate the key objects
Key[] keys = session.GenerateKeyPair(Mechanism.RSA_PKCS_KEY_PAIR_GEN, templatePub, templatePri);

RSAPrivateKey privateKey = (RSAPrivateKey)keys[1];
RSAPublicKey publicKey = (RSAPublicKey)keys[0];

9. Encrypt and decrypt¶

string helloworld = "Hello World";
byte[] text = Encoding.ASCII.GetBytes(helloworld);

// launches the encryption operation DES mechanism
nRes = session.EncryptInit(Mechanism.DES, key);

// computes the encryption
byte[] encrypted = session.Encrypt(text);

...

nRes = session.DecryptInit(Mechanism.DES, key);

byte[] decrypted = session.Decrypt(encrypted);

10. Sign and Verify¶

string helloworld = "Hello World";
byte[] text = Encoding.ASCII.GetBytes(helloworld);

// launches the digital signing operation with a RSA_PKCS mechanism
nRes = session.SignInit(Mechanism.SHA1_RSA_PKCS, privateKey);

// computes the signature
byte[] signature = session.Sign(text);

...

nRes = session.VerifyInit(Mechanism.SHA1_RSA_PKCS, publicKey);

nRes = session.Verify(text, signature);
if(nRes == 0)
    Console.Write("Verify " + nRes);