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# DKIM Signer
Sign RFC822 messages with DKIM. This module is extracted from [dkim-signer](https://github.com/andris9/dkim-signer).
## Usage
```javascript
// require signer function
var DKIMSign = require("node-dkim").DKIMSign;
// generate a RFC822 message
var rfc822message = "Subject: test\r\n\r\nHello world";
// setup DKIM options
var dkimOptions = {
domainName: "example.info",
keySelector: "dkim",
privateKey: require("fs").readFileSync("./test_private.pem")
};
// generate signature header field
var signature = DKIMSign(rfc822message, dkimOptions);
// join signature header field with the message
console.log(signature + "\r\n" + rfc822message);
```
## Another Uses
```javascript
// require signer function
var DKIMSigner = require("node-dkim").DKIMSigner;
var fs=require('fs');
// generate a RFC822 message
var rs=fs.createReadStream(filePath)
var ws=fs.createWriteStream(fileDestPath)
// setup DKIM options
var dkimOptions = {
domainName: "example.info",
keySelector: "dkim",
privateKey: require("fs").readFileSync("./test_private.pem")
};
// generate signature and write to another file
rs.pipe(new DKIMSigner(dkimOptions)).pipe(ws);
```
## License
**MIT**