DomainKeys Identified Mail (DKIM)

Install via npm

$ npm install --save dkim

API

DKIM : Object

Kind: global variable

• DKIM : Object
  • .Signature
    • new DKIM.Signature()
  • .Key
    • new DKIM.Key()
  • .NONE : String
  • .OK : String
  • .TEMPFAIL : String
  • .PERMFAIL : String
  • .getKey(domain, [selector], callback)
  • .processBody(message, method) ⇒ String
  • .processHeader(headers, signHeaders, method) ⇒ String
  • .verifySignature(body, headers, callback)
  • .verify(message, callback)

DKIM.Signature

Kind: static class of DKIM
See: dkim-signature

new DKIM.Signature()

DKIM Signature

DKIM.Key

Kind: static class of DKIM
See: dkim-key

new DKIM.Key()

DKIM Key

DKIM.NONE : String

Kind: static property of DKIM

DKIM.OK : String

Kind: static property of DKIM

DKIM.TEMPFAIL : String

Kind: static property of DKIM

DKIM.PERMFAIL : String

Kind: static property of DKIM

DKIM.getKey(domain, [selector], callback)

Retrieve a domain key

Kind: static method of DKIM
Note: Throw error if the public key is not a Buffer
Todo

• DNS seems to FORMERR on unregistered / expired domains, which maybe should be a TEMPFAIL (?)
• make this public_key = dkim_find_key(q_val, d_val, s_val), where *_val are the signature's attribute values

Params

• domain String

• [selector] String

• callback function

DKIM.processBody(message, method) ⇒ String

Canonicalize the message body according to methods defined in RFC[XXXX]

Kind: static method of DKIM
Throws:

• Error If canonicalization method is unsupported

Params

• message Buffer | String

• method String - (simple|relaxed)

DKIM.processHeader(headers, signHeaders, method) ⇒ String

Canonicalize the message header according to methods defined in RFC[6376]

example usage: DKIM.processHeader([ 'A: X', 'B : Y\t\r\n\tZ '], ['A'], 'relaxed')

Kind: static method of DKIM
Throws:

• Error If canonicalization method is unsupported

Params

• headers Array.<String> - Each header is formatted as <field>: <value>

• signHeaders Array

• method String - (simple|relaxed)

DKIM.verifySignature(body, headers, callback)

Verify a message signature

Kind: static method of DKIM
Params

• body Buffer

• headers Array

• callback function

DKIM.verify(message, callback)

Verify a message's signatures

Kind: static method of DKIM
Throws:

• Error If input is not a buffer

Params

• message Buffer

• callback function

processSignature()

For messages that have multiple signatures, We want add headers to each signature without including signature headers of other signatures

ex: Input ===== 1 ===== [ 'DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;\r\n d=fusemachines.com; s=google;\r\n h=mime-version:from:date:message-id:subject:to;\r\n bh=9w2H8ucfF1w3+Zqu9gpPcHgTU9GHPjw7E2HYHHlZEkw=;\r\n b=iPc3RHh9oXL6+dvuPM0hYt1vdj6U4hN83BFxhumWsSXnFDFmbSG4OtXHPF823HoZAA\r\n 4MbFQu5VgfvAQ+FmnKyfON2WdJrAYicyslVXlcA6l0UKSGIH/0NHSqi/kX+4KEKaClY7\r\n jZkXZZ8EIl5IUBdRRUWSsySFOtrQ/9IeAb6YM=', 'X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;\r\n d=1e100.net; s=20161025;\r\n h=x-gm-message-state:mime-version:from:date:message-id:subject:to;\r\n bh=9w2H8ucfF1w3+Zqu9gpPcHgTU9GHPjw7E2HYHHlZEkw=;\r\n b=gaapyixgX52/f91ifJ2hxRuk13TLcG1ZKUo+Ci3j5a6rKCISPtmLXxwaXq5tghh5qg\r\n r7S/oe5nDijJmdo1pIBDYGf9U+IDgIT9jHxP3pUoLwmhgnO3pr1di1JH0361ogIsGq/W\r\n wATmvMTeEA1jAnKw8sr9Rb+jl2MUhqZLhL5Lhkdx/l5CCI0mfUmRAuv1XvGKdrPexM00\r\n 4UTNx9VeK8qYQ/jdf1BiX0ICrj/7e5hSImZ44ctHzn/HA3Htur6cBdFlAVHpW5/vPj0q\r\n xnz5KQATcG0GmTX2rF27SGhAyPzRl+CZ0SDg9cGV2CvQ5kbDxsxOdzotR2X4hqksqMcC\r\n S+EQ==', 'X-Gm-Message-State: AMCzsaVGkvHZbfZofPrsj3QKBCLwg3nAsBM8cWdu5BXU7v1zENATSRJC uiG27aeGnsU8HjTsRFYk1HqnrNYGNuxg5R7wfRrnRw==', 'X-Google-Smtp-Source: ABhQp+RznzRtpIGeOvxieUGeSxwDHEfX8SuSwMwZJSlXyU4GyjbzDw6PsT5DOScWWomiALUIa/1ktC1p5vFEDe7HcH8=', 'X-Received: by 10.200.3.87 with SMTP id w23mr15494938qtg.98.1508680821032; Sun, 22 Oct 2017 07:00:21 -0700 (PDT)', 'MIME-Version: 1.0', 'Received: by 10.12.141.15 with HTTP; Sun, 22 Oct 2017 07:00:00 -0700 (PDT)', 'From: Marcellin Nshimiyimana mars@fusemachines.com', 'Date: Sun, 22 Oct 2017 19:45:00 +0545', 'Message-ID: CAOwpMi-cqMgYZ4BqFeP2QASdS54oqQ6diFfFQn+eVAVhHEC4yw@mail.gmail.com', 'Subject: Test email', 'To: Mars-sprint nmarcellin2@gmail.com', 'Content-Type: multipart/alternative; boundary="f4030435c3286adbf3055c232081"' ] ===== 2 ===== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;\r\n d=fusemachines.com; s=google;\r\n h=mime-version:from:date:message-id:subject:to;\r\n bh=9w2H8ucfF1w3+Zqu9gpPcHgTU9GHPjw7E2HYHHlZEkw=;\r\n b=iPc3RHh9oXL6+dvuPM0hYt1vdj6U4hN83BFxhumWsSXnFDFmbSG4OtXHPF823HoZAA\r\n 4MbFQu5VgfvAQ+FmnKyfON2WdJrAYicyslVXlcA6l0UKSGIH/0NHSqi/kX+4KEKaClY7\r\n jZkXZZ8EIl5IUBdRRUWSsySFOtrQ/9IeAb6YM=

Output

[ 'DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;\r\n d=fusemachines.com; s=google;\r\n h=mime-version:from:date:message-id:subject:to;\r\n bh=9w2H8ucfF1w3+Zqu9gpPcHgTU9GHPjw7E2HYHHlZEkw=;\r\n b=iPc3RHh9oXL6+dvuPM0hYt1vdj6U4hN83BFxhumWsSXnFDFmbSG4OtXHPF823HoZAA\r\n 4MbFQu5VgfvAQ+FmnKyfON2WdJrAYicyslVXlcA6l0UKSGIH/0NHSqi/kX+4KEKaClY7\r\n jZkXZZ8EIl5IUBdRRUWSsySFOtrQ/9IeAb6YM=', 'X-Gm-Message-State: AMCzsaVGkvHZbfZofPrsj3QKBCLwg3nAsBM8cWdu5BXU7v1zENATSRJC uiG27aeGnsU8HjTsRFYk1HqnrNYGNuxg5R7wfRrnRw==', 'X-Google-Smtp-Source: ABhQp+RznzRtpIGeOvxieUGeSxwDHEfX8SuSwMwZJSlXyU4GyjbzDw6PsT5DOScWWomiALUIa/1ktC1p5vFEDe7HcH8=', 'X-Received: by 10.200.3.87 with SMTP id w23mr15494938qtg.98.1508680821032; Sun, 22 Oct 2017 07:00:21 -0700 (PDT)', 'MIME-Version: 1.0', 'Received: by 10.12.141.15 with HTTP; Sun, 22 Oct 2017 07:00:00 -0700 (PDT)', 'From: Marcellin Nshimiyimana mars@fusemachines.com', 'Date: Sun, 22 Oct 2017 19:45:00 +0545', 'Message-ID: CAOwpMi-cqMgYZ4BqFeP2QASdS54oqQ6diFfFQn+eVAVhHEC4yw@mail.gmail.com', 'Subject: Test email', 'To: Mars-sprint nmarcellin2@gmail.com', 'Content-Type: multipart/alternative; boundary="f4030435c3286adbf3055c232081"' ]

Kind: global function