Documentation

Verifying Mail with DKIM.

>>> rs <- makeResolvSeed defaultResolvConf
>>> :{
let lst = ["DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;"
          ,"        d=gmail.com; s=20161025;"
          ,"        h=mime-version:from:date:message-id:subject:to;"
          ,"        bh=IQB23UrpTWE7dPV0Ebeqy3ZJyCILT/tw2Ixhmh83FJ0=;"
          ,"        b=BCZrZwEnJfrdbbNqM+bWHeDrdHKvc6DvjafGCDndUUkHPbfVvvx2RTYfkC3LT1uCZC"
          ,"         7vzKmucESLK5PVh4mAGNQjHDmdvhq7GIubOVK8Uoq+MpjZ321SwNI7rck/uLq512bfvO"
          ,"         NU9nYcUGNIKh+rho6V8XHX/REsfE+a8jGUvywZgV5IoORfTvejEluuy360PN0rAjSmi3"
          ,"         j5WRFV7XR5pCzAN78hmsUaTzf8zdwQwIlSsnUylnlRmc97xU5Ou3VBzxBV+ScXZsX5jI"
          ,"         TNv+ujuZcoO0fS0zm7UwmcOzXb01cQpBDqHK8cBvEdQ4+8LSx/Nf1UaOBrecw6GiwN23"
          ,"         BFBg=="
          ,"MIME-Version: 1.0"
          ,"Received: by 10.37.15.133 with HTTP; Wed, 20 Sep 2017 01:19:02 -0700 (PDT)"
          ,"From: Kazu Yamamoto <kazu.yamamoto@gmail.com>"
          ,"Date: Wed, 20 Sep 2017 17:19:02 +0900"
          ,"Message-ID: <CAKipW39GqeTzzQzB6WhM86_P==xTHwioa5gE=wZZ96fzf1j3Vw@mail.gmail.com>"
          ,"Subject: test for DKIM"
          ,"To: Kazu Yamamoto <kazu@iij.ad.jp>"
          ,"Content-Type: text/plain; charset=\"UTF-8\""
          ,""
          ,"this is test."
          ,""
          ]
    mail = getMail $ BS8.intercalate "\r\n" lst
in withResolver rs $ \rslv -> runDKIM rslv mail
:}
pass

Verifying Mail with DKIM. The value of DKIM-Signature: should be parsed beforehand.

Parsing DKIM-Signature:.

>>> :{
let dkim = BS8.concat [
                  "v=1; a=rsa-sha256; s=brisbane; d=example.com;\n"
                , "         c=relaxed/simple; q=dns/txt; i=joe@football.example.com;\n"
                , "         h=Received : From : To : Subject : Date : Message-ID;\n"
                , "         bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=;\n"
                , "         b=AuUoFEfDxTDkHlLXSZEpZj79LICEps6eda7W3deTVFOk4yAUoqOB\n"
                , "           4nujc7YopdG5dWLSdNg6xNAZpOPr+kHxt1IrE+NahM6L/LbvaHut\n"
                , "           KVdkLLkpVaVVQPzeRDI009SO2Il5Lu7rDNH6mZckBdrIx0orEtZV\n"
                , "           4bmp/YzhwvcubU4=;"
                ]
in pPrintNoColor $ parseDKIM dkim
:}
Just 
    ( DKIM 
        { dkimVersion = "1"
        , dkimSigAlgo = RSA_SHA256
        , dkimSignature = "AuUoFEfDxTDkHlLXSZEpZj79LICEps6eda7W3deTVFOk4yAUoqOB4nujc7YopdG5dWLSdNg6xNAZpOPr+kHxt1IrE+NahM6L/LbvaHutKVdkLLkpVaVVQPzeRDI009SO2Il5Lu7rDNH6mZckBdrIx0orEtZV4bmp/YzhwvcubU4="
        , dkimBodyHash = "2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8="
        , dkimHeaderCanon = DKIM_RELAXED
        , dkimBodyCanon = DKIM_SIMPLE
        , dkimDomain0 = "example.com"
        , dkimFields = 
            [ "received"
            , "from"
            , "to"
            , "subject"
            , "date"
            , "message-id"
            ] 
        , dkimLength = Nothing
        , dkimSelector0 = "brisbane"
        } 
    )

>>> :{
let dkim = BS8.concat [
                 "v=1; a=rsa-sha256; s=brisbane; d=example.com;\n"
               , "         q=dns/txt; i=joe@football.example.com;\n"
               , "         h=Received : From : To : Subject : Date : Message-ID;\n"
               , "         bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=;\n"
               , "         b=AuUoFEfDxTDkHlLXSZEpZj79LICEps6eda7W3deTVFOk4yAUoqOB\n"
               , "           4nujc7YopdG5dWLSdNg6xNAZpOPr+kHxt1IrE+NahM6L/LbvaHut\n"
               , "           KVdkLLkpVaVVQPzeRDI009SO2Il5Lu7rDNH6mZckBdrIx0orEtZV\n"
               , "           4bmp/YzhwvcubU4=;"
               ]
in pPrintNoColor $ parseDKIM dkim
:}
Just 
    ( DKIM 
        { dkimVersion = "1"
        , dkimSigAlgo = RSA_SHA256
        , dkimSignature = "AuUoFEfDxTDkHlLXSZEpZj79LICEps6eda7W3deTVFOk4yAUoqOB4nujc7YopdG5dWLSdNg6xNAZpOPr+kHxt1IrE+NahM6L/LbvaHutKVdkLLkpVaVVQPzeRDI009SO2Il5Lu7rDNH6mZckBdrIx0orEtZV4bmp/YzhwvcubU4="
        , dkimBodyHash = "2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8="
        , dkimHeaderCanon = DKIM_SIMPLE
        , dkimBodyCanon = DKIM_SIMPLE
        , dkimDomain0 = "example.com"
        , dkimFields = 
            [ "received"
            , "from"
            , "to"
            , "subject"
            , "date"
            , "message-id"
            ] 
        , dkimLength = Nothing
        , dkimSelector0 = "brisbane"
        } 
    )

Getting of the value of the "d" tag in DKIM-Signature:.

Getting of the value of the "s" tag in DKIM-Signature:.

Canonicalized key for DKIM-Signature:.