forked from glycerine/goq
/
keys.go
237 lines (190 loc) · 5.01 KB
/
keys.go
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package main
// manage AES keys via KeyCzar / dkeyczar
import (
"fmt"
"io/ioutil"
"os"
"strconv"
dkeyczar "github.com/dgryski/dkeyczar"
)
type CypherKey struct {
Mgr *dkeyczar.KeyManager
Loc string
crypter dkeyczar.Crypter
VerboseDebug bool
}
// convenience method for getting started
func OpenExistingOrCreateNewKey(cfg *Config) (key *CypherKey, err error) {
if KeyExists(cfg) {
return LoadKey(cfg)
}
return NewKey(cfg)
}
func KeyExists(cfg *Config) bool {
loc := cfg.KeyLocation()
if !DirExists(loc) {
return false
}
if !FileExists(loc + "/meta") {
return false
}
if !FileExists(loc + "/1") {
return false
}
return true
}
func NewKey(cfg *Config) (key *CypherKey, err error) {
key = &CypherKey{VerboseDebug: cfg.DebugMode}
km := *MakeKeyMgr()
key.Loc = cfg.KeyLocation()
if !DirExists(key.Loc) {
os.MkdirAll(key.Loc, 0700)
} else {
// we already have a key directory, so just make a new key and promote it
return nil, fmt.Errorf("location '%s' already has a key it", key.Loc)
}
updateKeyDir(key.Loc, km, nil)
// make actual key
c := loadCrypter("")
err = loadLocationReader(km, key.Loc, c)
if err != nil {
panic(fmt.Sprintf("could not load keyset from location '%s': %s", key.Loc, err))
}
status := dkeyczar.S_PRIMARY
//status := dkeyczar.S_ACTIVE
//status := dkeyczar.S_INACTIVE
err = km.AddKey(uint(0), status)
if err != nil {
panic(fmt.Sprintf("error adding key: %s", err))
}
updateKeyDir(key.Loc, km, c)
// don't need these if we create with S_PRIMARY, but
// here's how to promote to primary if needed later.
if status != dkeyczar.S_PRIMARY {
keyversion := 1
km.Promote(keyversion)
updateKeyDir(key.Loc, km, nil)
}
key.InstantiateCrypter()
return key, nil
}
func (k *CypherKey) DeleteKey() (err error) {
if DirExists(k.Loc) {
return os.RemoveAll(k.Loc)
}
return nil
}
func MakeKeyMgr() *dkeyczar.KeyManager {
// make key set
keytype := dkeyczar.T_AES
km := dkeyczar.NewKeyManager()
keypurpose := dkeyczar.P_DECRYPT_AND_ENCRYPT
km.Create("goq.aes.key", keypurpose, keytype)
return &km
}
func LoadKey(cfg *Config) (*CypherKey, error) {
loc := cfg.KeyLocation()
if !DirExists(loc) {
return nil, fmt.Errorf("request to LoadKey from bad Loc: %s", loc)
}
km := *MakeKeyMgr()
err := loadLocationReader(km, loc, nil)
if err != nil {
return nil, fmt.Errorf("could not load keyset from location '%s': %s", loc, err)
}
k := &CypherKey{Mgr: &km, Loc: loc, VerboseDebug: cfg.DebugMode}
k.InstantiateCrypter()
return k, nil
}
func (k *CypherKey) InstantiateCrypter() {
c := loadCrypter("")
r := loadReader(k.Loc, c)
if r == nil {
panic(fmt.Sprintf("could not read keys from '%s'", k.Loc))
}
// a crypter can decode as well as encode
crypter, err := dkeyczar.NewCrypter(r)
if err != nil {
panic(err)
}
crypter.SetEncoding(dkeyczar.NO_ENCODING)
//crypter.SetEncoding(dkeyczar.BASE64W)
k.crypter = crypter
}
func (k *CypherKey) Encrypt(plain []byte) []byte {
output, err := k.crypter.Encrypt(plain)
if err != nil {
panic(err)
}
return []byte(output)
}
func (k *CypherKey) Decrypt(cypher []byte) []byte {
output, err := k.crypter.Decrypt(string(cypher))
if err != nil {
if k.VerboseDebug {
fmt.Fprintf(os.Stderr, "\n Alert: two-clusters trying to communicate? could not decrypt message: %s\n", err)
}
return []byte{}
//panic(err)
}
return output
}
func (k *CypherKey) IsValid() bool {
plain := []byte("hello world")
cypher := k.Encrypt(plain)
cs := string(cypher)
plain2 := string(k.Decrypt(cypher))
fmt.Printf("plain: '%s', cypher: '%s', plain2: '%s'\n", plain, cypher, plain2)
if cs != string(plain) && string(plain) == plain2 {
return true
}
return false
}
func updateKeyDir(location string, km dkeyczar.KeyManager, encrypter dkeyczar.Encrypter) {
s := km.ToJSONs(encrypter)
ioutil.WriteFile(location+"/meta", []byte(s[0]), 0600)
for i := 1; i < len(s); i++ {
fname := location + "/" + strconv.Itoa(i)
ioutil.WriteFile(fname, []byte(s[i]), 0600)
}
}
func loadLocationReader(km dkeyczar.KeyManager, location string, crypter dkeyczar.Crypter) error {
if location == "" {
panic("missing required location argument")
}
lr := dkeyczar.NewFileReader(location)
if crypter != nil {
//fmt.Println("decrypting keys..")
lr = dkeyczar.NewEncryptedReader(lr, crypter)
}
err := km.Load(lr)
if err != nil {
return fmt.Errorf("failed to load key: %s", err)
}
return nil
}
func loadCrypter(optCrypter string) dkeyczar.Crypter {
if optCrypter == "" {
return nil
}
//fmt.Println("using crypter:", optCrypter)
r := dkeyczar.NewFileReader(optCrypter)
crypter, err := dkeyczar.NewCrypter(r)
if err != nil {
panic(fmt.Sprintf("failed to load crypter: %s", err))
//return nil
}
return crypter
}
func loadReader(optLocation string, crypter dkeyczar.Crypter) dkeyczar.KeyReader {
if optLocation == "" {
panic("missing required location argument")
//return nil
}
lr := dkeyczar.NewFileReader(optLocation)
if crypter != nil {
//fmt.Println("decrypting keys..")
lr = dkeyczar.NewEncryptedReader(lr, crypter)
}
return lr
}