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crypt.go
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crypt.go
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// Copyright 2018 OpenConfigd Project.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package quagga
import (
"math/rand"
"sync"
"time"
"unsafe"
)
/*
#include <crypt.h>
#include <stdlib.h>
#include <unistd.h>
#cgo LDFLAGS: -lcrypt
*/
import "C"
var (
letters = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
passLetters = append(letters, []rune("!#$%&'()*+,-./:;<=>?@`{|}")...)
initialized = false
)
func randSeq(n int) string {
b := make([]rune, n)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}
func generateHash(key, salt string) string {
var mutex = &sync.Mutex{}
cKey := C.CString(key)
defer C.free(unsafe.Pointer(cKey))
cSalt := C.CString(salt)
defer C.free(unsafe.Pointer(cSalt))
mutex.Lock()
cHash, _ := C.crypt(cKey, cSalt)
mutex.Unlock()
return C.GoString(cHash)
}
func Crypt(passwd string) string {
return generateHash(passwd, randSeq(5))
}
func Verify(passwd, hash string) bool {
if generateHash(passwd, hash) == hash {
return true
}
return false
}
func GeneratePasswd() string {
if initialized == false {
rand.Seed(time.Now().UnixNano())
initialized = true
}
b := make([]rune, 8)
for i := range b {
b[i] = passLetters[rand.Intn(len(passLetters))]
}
return string(b)
}