<commit_before>package network

import (
	"bufio"
	"bytes"
	"crypto/aes"
	"crypto/cipher"
	"crypto/hmac"
	"crypto/rand"
	"crypto/sha1"
	"crypto/sha256"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"strings"
	"sync"
	"time"
)

type PasswordLookup interface {
	Password(user string) (string, error)
}

type AuthFile struct {
	name string
	last time.Time
	data map[string]string
	lock *sync.Mutex
}

func NewAuthFile(name string) *AuthFile {
	return &AuthFile{
		name: name,
		lock: &sync.Mutex{},
	}
}

func (a *AuthFile) Password(user string) (string, error) {<commit_msg>network: Document PasswordLookup and AuthFile.<commit_after>package network

import (
	"bufio"
	"bytes"
	"crypto/aes"
	"crypto/cipher"
	"crypto/hmac"
	"crypto/rand"
	"crypto/sha1"
	"crypto/sha256"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"strings"
	"sync"
	"time"
)

// PasswordLookup is used when parsing signed and encrypted network traffic to
// look up the password associated with a given username.
type PasswordLookup interface {
	Password(user string) (string, error)
}

// AuthFile implements the PasswordLookup interface in the same way the
// collectd network plugin implements it, i.e. by stat'ing and reading a file.
type AuthFile struct {
	name string
	last time.Time
	data map[string]string
	lock *sync.Mutex
}

// NewAuthFile initializes and returns a new AuthFile.
func NewAuthFile(name string) *AuthFile {
	return &AuthFile{
		name: name,
		lock: &sync.Mutex{},
	}
}

// Password looks up a user in the file and returns the associated password.
func (a *AuthFile) Password(user string) (string, error) {
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