Go与Python的crypt.crypt等价吗？

问题描述

我目前正在玩暴力Python一书中的一个例子。您可以在

解决方案

crypt 是非常容易用cgo包装，例如

 包主
 
导入（
fmt 
unsafe
）
 
 // #cgo LDFLAGS：-lcrypt 
 // #define _GNU_SOURCE 
 // #include< crypt。 h取代; 
 //＃包括< stdlib.h> 
导入C
 
 // crypt封装C库crypt_r 
 func crypt（键，盐串）string {
 data：= C.struct_crypt_data {} 
 ckey：= C.CString（key）
 csalt：= C.CString（salt）
 out：= C.GoString（C.crypt_r（ckey，csalt，& data））
 C.free（unsafe.Pointer（ckey））
 C.free（unsafe.Pointer（csalt））
返回
} 
 
 func main （）{
 fmt.Println（crypt（abcdefg，aa））
} 
  

运行时产生此结果

  aaTcvO819w3js 
  

这与python crypt.crypt

 >>> from crypt import crypt 
>>> crypt（abcdefg，aa）
'aaTcvO819w3js'
>>> 
  

（更新为释放CStrings - thanks @ james-henstridge）

I am currently playing around with an example from the book Violent Python. You can see my implementation here

I am now trying to implement the same script in Go to compare performance, note I am completely new to Go. Opening the file and iterating over the lines is fine, however I cannot figure out how to use the "crypto" library to hash the string in the same way as Python's crypt.crypt(str_to_hash, salt). I thought it maybe something like

import "crypto/des"
des.NewCipher([]byte("abcdefgh"))

However, no cigar. Any help would be much appreciated as it'd be really interesting to compare Go's parallel performance to Python's multithreaded.

Edit:Python docs for crypt.crypt

解决方案

crypt is very easy to wrap with cgo, eg

package main

import (
    "fmt"
    "unsafe"
)

// #cgo LDFLAGS: -lcrypt
// #define _GNU_SOURCE
// #include <crypt.h>
// #include <stdlib.h>
import "C"

// crypt wraps C library crypt_r
func crypt(key, salt string) string {
    data := C.struct_crypt_data{}
    ckey := C.CString(key)
    csalt := C.CString(salt)
    out := C.GoString(C.crypt_r(ckey, csalt, &data))
    C.free(unsafe.Pointer(ckey))
    C.free(unsafe.Pointer(csalt))
    return out
}

func main() {
    fmt.Println(crypt("abcdefg", "aa"))
}

Which produces this when run

aaTcvO819w3js

Which is identical to python crypt.crypt

>>> from crypt import crypt
>>> crypt("abcdefg","aa")
'aaTcvO819w3js'
>>> 

(Updated to free the CStrings - thanks @james-henstridge)

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