What is Go's equivalent to Python's crypt.crypt?

Question

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

Answer 1

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)