https://github.com/kalloc/dkim

Golang DKIM Verifier
https://github.com/kalloc/dkim

dkim dkim-verifier go

Last synced: 5 months ago
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Golang DKIM Verifier

• Host: GitHub
• URL: https://github.com/kalloc/dkim
• Owner: kalloc
• Created: 2015-01-05T01:01:40.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2017-05-02T19:56:47.000Z (over 8 years ago)
• Last Synced: 2025-03-30T23:05:34.525Z (6 months ago)
• Topics: dkim, dkim-verifier, go
• Language: Go
• Homepage:
• Size: 23.4 KB
• Stars: 21
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Yet Another DKIM Verifier

## Why not?

I found some DKIM solution for go, but I don’t like untested C binding and I have some time (thank you mr.Putin)

I wrote this code for my pet project.

## What can we do?

We can verify DKIM headers very fast.

It is about 44mb per second on my laptop.

We support custom resolving and custom cache logic. 

## TODO

- Support Length tag

- Support Time

- Support ExpireTime

- Support Copied header fields (z=)

- Sign

## How to use it?

```go

package main

import (

	"bufio"

	"flag"

	"fmt"

	"os"

	"github.com/kalloc/dkim"

)

// ./test path/to/emls/*.eml

func main() {

	var (

		filename string

		fp       *os.File

		err      error

		dk       *dkim.DKIM

	)

	flag.Parse()

	for _, filename = range flag.Args() {

		fmt.Printf("Check: %s — ", filename)

		if fp, err = os.Open(filename); err != nil {

			fmt.Printf("ERR-WRONG_FILE")

		} else if dk, _ = dkim.ParseEml(bufio.NewReader(fp)); dk == nil {

			fmt.Printf("ERR-DKIM_NOT_FOUND")

		} else if _, err = dk.GetPublicKey(); err != nil {

			fmt.Printf("ERR-DKIM_PK_NOT_FOUND")

		} else if dk.Verify() == false {

			fmt.Printf("ERR-DKIM_NOT_VERIFIED (Body is %v, Sig is %v)", dk.Status.ValidBody, dk.Status.Valid)

		} else {

			fmt.Printf("OK")

		}

		fmt.Printf("\n")

	}

}

```