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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Directory : /usr/share/doc/python3-cryptography/docs/development/custom-vectors/hkdf/

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Current File : //usr/share/doc/python3-cryptography/docs/development/custom-vectors/hkdf/verify_hkdf.go

package main

import (
	"bufio"
	"bytes"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"golang.org/x/crypto/hkdf"
	"io"
	"os"
	"strconv"
	"strings"
)

func unhexlify(s string) []byte {
	bytes, err := hex.DecodeString(s)
	if err != nil {
		panic(err)
	}
	return bytes
}

func verifier(l uint64, ikm, okm []byte) bool {
	hash := sha256.New
	hkdf := hkdf.New(hash, ikm, nil, nil)
	okmComputed := make([]byte, l)
	io.ReadFull(hkdf, okmComputed)
	return bytes.Equal(okmComputed, okm)
}

func validateVectors(filename string) bool {
	vectors, err := os.Open(filename)
	if err != nil {
		panic(err)
	}
	defer vectors.Close()

	var segments []string
	var l uint64
	var ikm, okm string

	scanner := bufio.NewScanner(vectors)
	for scanner.Scan() {
		segments = strings.Split(scanner.Text(), " = ")

		switch {
		case strings.ToUpper(segments[0]) == "L":
			l, err = strconv.ParseUint(segments[1], 10, 64)
			if err != nil {
				panic(err)
			}
		case strings.ToUpper(segments[0]) == "IKM":
			ikm = segments[1]
		case strings.ToUpper(segments[0]) == "OKM":
			okm = segments[1]
		}
	}
	return verifier(l, unhexlify(ikm), unhexlify(okm))
}

func main() {
	if validateVectors("vectors/cryptography_vectors/KDF/hkdf-generated.txt") {
		fmt.Println("HKDF OK.")
	} else {
		fmt.Println("HKDF failed.")
		os.Exit(1)
	}
}

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