(Unicode C) 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.

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#include <C_CkPfxW.h>
#include <C_CkEmailW.h>
#include <C_CkCertW.h>
#include <C_CkMailManW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    HCkPfxW pfx;
    BOOL success;
    HCkEmailW email;
    HCkCertW cert;
    HCkMailManW mailman;
    HCkStringBuilderW sbSignedEmail;

    // 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 = CkPfxW_Create();
    success = CkPfxW_LoadPfxFile(pfx,L"qa_data/rsassa-pss/privatekey.pfx",L"PFX_PASSWORD");
    if (success != TRUE) {
        wprintf(L"%s\n",CkPfxW_lastErrorText(pfx));
        CkPfxW_Dispose(pfx);
        return;
    }

    email = CkEmailW_Create();

    // 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 = CkEmailW_LoadEml(email,L"qa_data/rsassa-pss/sample.eml");
    if (success != TRUE) {
        wprintf(L"%s\n",CkEmailW_lastErrorText(email));
        CkPfxW_Dispose(pfx);
        CkEmailW_Dispose(email);
        return;
    }

    // Indicate that the email is to be signed, and that we want to use RSASSA-PSS.
    CkEmailW_putSendSigned(email,TRUE);
    CkEmailW_putSigningAlg(email,L"pss");
    CkEmailW_putSigningHashAlg(email,L"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 = CkPfxW_GetCert(pfx,0);
    if (CkPfxW_getLastMethodSuccess(pfx) != TRUE) {
        wprintf(L"%s\n",CkPfxW_lastErrorText(pfx));
        CkPfxW_Dispose(pfx);
        CkEmailW_Dispose(email);
        return;
    }

    // Tell the email object to use this cert (and private key) for signing.
    CkEmailW_SetSigningCert(email,cert);
    CkCertW_Dispose(cert);

    // The mailman object will do the RSASSA-PSS signing.
    mailman = CkMailManW_Create();

    // Tell the mailman to produce a multipart/signed email instead of an application/pkcs7-mime.
    CkMailManW_putOpaqueSigning(mailman,FALSE);

    // Tell the mailman to "render" the email. This signs the email and returns
    // the MIME of the signed email.
    sbSignedEmail = CkStringBuilderW_Create();
    success = CkMailManW_RenderToMimeSb(mailman,email,sbSignedEmail);
    if (success != TRUE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkPfxW_Dispose(pfx);
        CkEmailW_Dispose(email);
        CkMailManW_Dispose(mailman);
        CkStringBuilderW_Dispose(sbSignedEmail);
        return;
    }

    // Save the signed email to a file.
    CkStringBuilderW_WriteFile(sbSignedEmail,L"qa_output/rsassa-pss-signed.eml",CkEmailW_charset(email),FALSE);

    wprintf(L"Success.\n");

    // -----------------------------------------------
    // 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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    // 4kZLBg==
    // 
    // --------------090003010300010703020907--
    // 


    CkPfxW_Dispose(pfx);
    CkEmailW_Dispose(email);
    CkMailManW_Dispose(mailman);
    CkStringBuilderW_Dispose(sbSignedEmail);

    }