### Set up SoftHSM and PKCS11 Environment Variables

Source: https://crates.io/crates/cryptoki/index

Installs SoftHSM, configures a token directory and SOFTHSM2 configuration file, and sets the TEST_PKCS11_MODULE environment variable. This is a prerequisite for running the key generation example.

```bash
sudo apt install libsofthsm2
mkdir /tmp/tokens
echo "directories.tokendir = /tmp/tokens" > /tmp/softhsm2.conf
export TEST_PKCS11_MODULE="/usr/lib/softhsm/libsofthsm2.so"
export SOFTHSM2_CONF="/tmp/softhsm2.conf"
```

--------------------------------

### Initialize Token and Generate RSA Key Pair using cryptoki

Source: https://crates.io/crates/cryptoki/index

Initializes an empty PKCS#11 token, sets the user PIN, and then generates an RSA key pair. This example demonstrates basic PKCS#11 operations like token initialization, login, and key generation using the cryptoki crate.

```rust
# fn main() -> testresult::TestResult {
use cryptoki::object::Attribute;
use cryptoki::context::{CInitializeArgs, Pkcs11};
use cryptoki::session::UserType;
use cryptoki::types::AuthPin;
use cryptoki::mechanism::Mechanism;
use std::env;

// initialize a new Pkcs11 object using the module from the env variable
let pkcs11 = Pkcs11::new(
    env::var("TEST_PKCS11_MODULE")
        .unwrap_or_else(|_| "/usr/local/lib/softhsm/libsofthsm2.so".to_string()),
)?;

pkcs11.initialize(CInitializeArgs::OsThreads)?;

let slot = pkcs11.get_slots_with_token()?[0];

// initialize a test token
let so_pin = AuthPin::new("abcdef".into());
pkcs11.init_token(slot, &so_pin, "Test Token")?;

let user_pin = AuthPin::new("fedcba".into());

// initialize user PIN
{
  let session = pkcs11.open_rw_session(slot)?;
  session.login(UserType::So, Some(&so_pin))?;
  session.init_pin(&user_pin)?;
}

// login as a user, the token has to be already initialized
let session = pkcs11.open_rw_session(slot)?;
session.login(UserType::User, Some(&user_pin))?;

// template of the public key
let pub_key_template = vec![
    Attribute::Token(true),
    Attribute::Private(false),
    Attribute::PublicExponent(vec![0x01, 0x00, 0x01]),
    Attribute::ModulusBits(1024.into()),
];

let priv_key_template = vec![Attribute::Token(true)];

// generate an RSA key according to passed templates
let (public, private) = session.generate_key_pair(&Mechanism::RsaPkcsKeyPairGen, &pub_key_template, &priv_key_template)?;
# Ok(())
# }
```

--------------------------------

### Generate RSA Key Pair with PKCS #11 in Rust

Source: https://crates.io/crates/cryptoki/0

Example demonstrating how to initialize a PKCS#11 object, get a slot, initialize a token, log in as a user, and generate an RSA key pair using the cryptoki crate. This requires a PKCS11 module to be specified via the PKCS11_SOFTHSM2_MODULE environment variable.

```rust
# fn main() -> testresult::TestResult {
use cryptoki::object::Attribute;
use cryptoki::context::{CInitializeArgs, Pkcs11};
use cryptoki::session::UserType;
use cryptoki::types::AuthPin;
use cryptoki::mechanism::Mechanism;

// initialize a new Pkcs11 object using the module from the env variable
let pkcs11 = Pkcs11::new(std::env::var("PKCS11_SOFTHSM2_MODULE")?)?;

pkcs11.initialize(CInitializeArgs::OsThreads)?;

let slot = pkcs11.get_slots_with_token()?[0];

// initialize a test token
let so_pin = AuthPin::new("abcdef".into());
pkcs11.init_token(slot, &so_pin, "Test Token")?;

let user_pin = AuthPin::new("fedcba".into());

// initialize user PIN
{
  let session = pkcs11.open_rw_session(slot)?;
  session.login(UserType::So, Some(&so_pin))?;
  session.init_pin(&user_pin)?;
}

// login as a user, the token has to be already initialized
let session = pkcs11.open_rw_session(slot)?;
session.login(UserType::User, Some(&user_pin))?;

// template of the public key
let pub_key_template = vec![
    Attribute::Token(true),
    Attribute::Private(false),
    Attribute::PublicExponent(vec![0x01, 0x00, 0x01]),
    Attribute::ModulusBits(1024.into()),
];

let priv_key_template = vec![Attribute::Token(true)];

// generate an RSA key according to passed templates
let (public, private) = session.generate_key_pair(&Mechanism::RsaPkcsKeyPairGen, &pub_key_template, &priv_key_template)?;
# Ok(()) }

```

--------------------------------

### Install cryptoki Crate

Source: https://crates.io/crates/cryptoki/index

Adds the cryptoki crate as a dependency to your Rust project. This can be done either via the command line or by directly editing your Cargo.toml file.

```bash
cargo add cryptoki
```

```toml
cryptoki = "0.10.0"
```

--------------------------------

### Enable Bindgen Binding Generation

Source: https://crates.io/crates/cryptoki/-sys/range/%5E0

To generate PKCS #11 FFI bindings on the fly using bindgen, enable the `generate-bindings` feature. This is useful if the pre-committed bindings do not meet your specific needs or target triplet. The feature is not enabled by default.

```toml
[dependencies]
cryptoki-sys = {
    version = "0.1.8",
    features = ["generate-bindings"],
}
```

--------------------------------

### Add cryptoki-sys to Cargo Project

Source: https://crates.io/crates/cryptoki/-sys/range/%5E0

This snippet shows how to add the cryptoki-sys crate to your Rust project's dependencies. You can either use the `cargo add` command or manually edit your `Cargo.toml` file. This is essential for integrating the PKCS #11 FFI bindings into your project.

```bash
cargo add cryptoki-sys@=0.1.8
```

```toml
[dependencies]
cryptoki-sys = "=0.1.8"
```

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