### Channel Bindings Generation Example

Source: https://github.com/mongodb/winkerberos/blob/master/README.rst

Example of generating channel bindings with help from the cryptography module.

```python
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes


def channel_bindings(ssl_socket):
    server_certificate = ssl_socket.getpeercert(True)
    cert = x509.load_der_x509_certificate(server_certificate, default_backend())
    hash_algorithm = cert.signature_hash_algorithm
    if hash_algorithm.name in ("md5", "sha1"):
        digest = hashes.Hash(hashes.SHA256(), default_backend())
    else:
        digest = hashes.Hash(hash_algorithm, default_backend())
    digest.update(server_certificate)
    application_data = b"tls-server-end-point:" + digest.finalize()
    return kerberos.channelBindings(application_data=application_data)
```

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

### Complete Authentication Session Example

Source: https://github.com/mongodb/winkerberos/blob/master/doc/index.rst

A simplified example of a complete authentication session following RFC-4752, section 3.1.

```python
import winkerberos as kerberos


def send_response_and_receive_challenge(response):
    # Your server communication code here...
    pass


def authenticate_kerberos(service, user, channel_bindings=None):
    # Initialize the context object with a service principal.
    status, ctx = kerberos.authGSSClientInit(service)

    # GSSAPI is a "client goes first" SASL mechanism. Send the
    # first "response" to the server and receive its first
    # challenge.
    if channel_bindings is not None:
        status = kerberos.authGSSClientStep(ctx, "", channel_bindings=channel_bindings)
    else:
        status = kerberos.authGSSClientStep(ctx, "")
    response = kerberos.authGSSClientResponse(ctx)
    challenge = send_response_and_receive_challenge(response)

    # Keep processing challenges and sending responses until
    # authGSSClientStep reports AUTH_GSS_COMPLETE.
    while status == kerberos.AUTH_GSS_CONTINUE:
        if channel_bindings is not None:
            status = kerberos.authGSSClientStep(
                ctx, "", channel_bindings=channel_bindings
            )
        else:
            status = kerberos.authGSSClientStep(ctx, "")

        response = kerberos.authGSSClientResponse(ctx) or ""
        challenge = send_response_and_receive_challenge(response)

    # Decrypt the server's last challenge
    kerberos.authGSSClientUnwrap(ctx, challenge)
    data = kerberos.authGSSClientResponse(ctx)
    # Encrypt a response including the user principal to authorize.
    kerberos.authGSSClientWrap(ctx, data, user)
    response = kerberos.authGSSClientResponse(ctx)

    # Complete authentication.
    send_response_and_receive_challenge(response)
```

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

### Complete Authentication Session Example

Source: https://github.com/mongodb/winkerberos/blob/master/README.rst

A simplified example of a complete authentication session following RFC-4752, section 3.1.

```python
import winkerberos as kerberos

def send_response_and_receive_challenge(response):
    # Your server communication code here...
    pass

def authenticate_kerberos(service, user, channel_bindings=None):
    # Initialize the context object with a service principal.
    status, ctx = kerberos.authGSSClientInit(service)

    # GSSAPI is a "client goes first" SASL mechanism. Send the
    # first "response" to the server and receive its first
    # challenge.
    if channel_bindings is not None:
        status = kerberos.authGSSClientStep(ctx, "", channel_bindings=channel_bindings)
    else:
        status = kerberos.authGSSClientStep(ctx, "")
    response = kerberos.authGSSClientResponse(ctx)
    challenge = send_response_and_receive_challenge(response)

    # Keep processing challenges and sending responses until
    # authGSSClientStep reports AUTH_GSS_COMPLETE.
    while status == kerberos.AUTH_GSS_CONTINUE:
        if channel_bindings is not None:
            status = kerberos.authGSSClientStep(
                ctx, challenge, channel_bindings=channel_bindings
            )
        else:
            status = kerberos.authGSSClientStep(ctx, challenge)

        response = kerberos.authGSSClientResponse(ctx) or ""
        challenge = send_response_and_receive_challenge(response)

    # Decrypt the server's last challenge
    kerberos.authGSSClientUnwrap(ctx, challenge)
    data = kerberos.authGSSClientResponse(ctx)
    # Encrypt a response including the user principal to authorize.
    kerberos.authGSSClientWrap(ctx, data, user)
    response = kerberos.authGSSClientResponse(ctx)

    # Complete authentication.
    send_response_and_receive_challenge(response)
```

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

### Viewing API Documentation

Source: https://github.com/mongodb/winkerberos/blob/master/README.rst

How to view API documentation using the help function in the python interactive shell.

```pycon
>>> import winkerberos
>>> help(winkerberos)
```

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