(PureBasic) Sign Email using RSASSA-PSS with SHA256

Demonstrates how to sign an email using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkCert.pb"
IncludeFile "CkEmail.pb"
IncludeFile "CkPfx.pb"
IncludeFile "CkMailMan.pb"

Procedure ChilkatExample()

    ; This example requires the Chilkat API to have been previously unlocked.
    ; See Global Unlock Sample for sample code.

    ; Get a digital certificate with private key from a .pfx
    ; (Chilkat has many different ways to provide a cert + private key for siging.
    ; Using a PFX is just one possible option.)
    pfx.i = CkPfx::ckCreate()
    If pfx.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkPfx::ckLoadPfxFile(pfx,"qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
    If success <> 1
        Debug CkPfx::ckLastErrorText(pfx)
        CkPfx::ckDispose(pfx)
        ProcedureReturn
    EndIf

    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Load an email to be signed.
    ; (We could have alternatively just built the email directly by setting the Subject, Body, From, To recipients, etc.)
    ; The contents of this sample email is shown below.
    success = CkEmail::ckLoadEml(email,"qa_data/rsassa-pss/sample.eml")
    If success <> 1
        Debug CkEmail::ckLastErrorText(email)
        CkPfx::ckDispose(pfx)
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    ; Indicate that the email is to be signed, and that we want to use RSASSA-PSS.
    CkEmail::setCkSendSigned(email, 1)
    CkEmail::setCkSigningAlg(email, "pss")
    CkEmail::setCkSigningHashAlg(email, "sha256")

    ; Get the certificate to be used for signing.
    ; (The typical case for a PFX is that it contains a cert with an associated private key,
    ; as well as other certificates in the chain of authentication.  The cert with the private
    ; key should be in the first position at index 0.)
    cert.i = CkPfx::ckGetCert(pfx,0)
    If CkPfx::ckLastMethodSuccess(pfx) <> 1
        Debug CkPfx::ckLastErrorText(pfx)
        CkPfx::ckDispose(pfx)
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    ; Tell the email object to use this cert (and private key) for signing.
    CkEmail::ckSetSigningCert(email,cert)
    CkCert::ckDispose(cert)

    ; The mailman object will do the RSASSA-PSS signing.
    mailman.i = CkMailMan::ckCreate()
    If mailman.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Tell the mailman to produce a multipart/signed email instead of an application/pkcs7-mime.
    CkMailMan::setCkOpaqueSigning(mailman, 0)

    ; Tell the mailman to "render" the email. This signs the email and returns
    ; the MIME of the signed email.
    sbSignedEmail.i = CkStringBuilder::ckCreate()
    If sbSignedEmail.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkMailMan::ckRenderToMimeSb(mailman,email,sbSignedEmail)
    If success <> 1
        Debug CkMailMan::ckLastErrorText(mailman)
        CkPfx::ckDispose(pfx)
        CkEmail::ckDispose(email)
        CkMailMan::ckDispose(mailman)
        CkStringBuilder::ckDispose(sbSignedEmail)
        ProcedureReturn
    EndIf

    ; Save the signed email to a file.
    CkStringBuilder::ckWriteFile(sbSignedEmail,"qa_output/rsassa-pss-signed.eml",CkEmail::ckCharset(email),0)

    Debug "Success."

    ; -----------------------------------------------
    ; This is the MIME of the pre-signed Email.
    ; Scroll down to see the signed MIME.

    ; MIME-Version: 1.0
    ; Date: Tue, 18 Apr 2017 10:12:16 -0500
    ; Message-ID: <D5E3C6F705B2C42C1ED1B5D835B50DDD4536267D@CHILKAT13>
    ; Content-Type: multipart/mixed; boundary="------------060103010600070703070806"
    ; X-Priority: 3 (Normal)
    ; Subject: This is a sample email
    ; To: "Chilkat Support" <support@chilkatsoft.com>
    ; From: "Chilkat GMail" <chilkat.support@gmail.com>
    ; 
    ; --------------060103010600070703070806
    ; Content-Type: multipart/alternative; boundary="------------000908080200080609080305"
    ; 
    ; --------------000908080200080609080305
    ; Content-Type: text/plain
    ; 
    ; This is the plain-text body
    ; --------------000908080200080609080305
    ; Content-Type: multipart/related; boundary="------------000600080404090108060206"
    ; 
    ; --------------000600080404090108060206
    ; Content-Type: text/html
    ; 
    ; <html><head></head><body><b>This is the HTML body</b><br><img src="starfish.jpg"></body></html>
    ; --------------000600080404090108060206
    ; Content-Type: image/jpeg; name="starfish.jpg"
    ; Content-Transfer-Encoding: base64
    ; Content-Disposition: inline; filename="starfish.jpg"
    ; Content-Location: starfish.jpg
    ; 
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    ; -----------------------------------------------------------
    ; Below is the RSASSA-PSS signed email:
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    ; Date: Tue, 18 Apr 2017 10:12:16 -0500
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    ; 
    ; --------------090003010300010703020907--
    ; 


    CkPfx::ckDispose(pfx)
    CkEmail::ckDispose(email)
    CkMailMan::ckDispose(mailman)
    CkStringBuilder::ckDispose(sbSignedEmail)


    ProcedureReturn
EndProcedure