(Go) Create ICP-Brasil Compliant CMS Signature

Demonstrates how to create a .p7s signature that contains a data file, which in this case is a PDF. The .p7s will be compliant with the ICP-Brazil Digital Signature Standard.

The .p7s file created by this example can be verified at ICP-Brasil Online Verifier

Note: Requires Chilkat v9.5.0.92 or greater.

For more information, see http://www.iti.gov.br/images/repositorio/consulta-publica/encerradas/DOC-ICP-15_-_Versao_2.2_VISAO_GERAL_SOBRE_ASSIN_DIG_NA_ICP-BRASIL_xx-xx-2015.pdf

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

    // ------------------------------------------------------------------------------------------------------
    // Note: This example creates a CMS signature (.p7s) that contains the PDF.
    // It is different than signing a PDF.  To sign a PDF where the resulting PDF contains the CMS signature,
    // see this example:  Sign PDF for ICP-Brasil
    // ------------------------------------------------------------------------------------------------------
    crypt := chilkat.NewCrypt2()

    // Any type of file can be signed.  It doesn't have to be a PDF.
    inFile := "qa_data/pdf/helloWorld.pdf"

    bd := chilkat.NewBinData()
    success := bd.LoadFile(inFile)
    if success == false {
        fmt.Println("Failed to load ", inFile)
        crypt.DisposeCrypt2()
        bd.DisposeBinData()
        return
    }

    // We'll be using a certificate w/ private key stored on a smartcard for signing.
    cert := chilkat.NewCert()

    // If the smartcard or token requires a PIN, we can set it here to avoid the dialog...
    cert.SetSmartCardPin("000000")

    success = cert.LoadFromSmartcard("")
    if success != true {
        fmt.Println(cert.LastErrorText())
        crypt.DisposeCrypt2()
        bd.DisposeBinData()
        cert.DisposeCert()
        return
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(cert)
    if success != true {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        bd.DisposeBinData()
        cert.DisposeCert()
        return
    }

    // Set properties for signing...
    crypt.SetHashAlgorithm("sha256")

    jsonSigningAttrs := chilkat.NewJsonObject()
    jsonSigningAttrs.UpdateInt("contentType",1)
    jsonSigningAttrs.UpdateInt("signingTime",1)
    jsonSigningAttrs.UpdateInt("messageDigest",1)
    jsonSigningAttrs.UpdateBool("signingCertificateV2",true)

    // Listed here are the currently existing profiles. (Chilkat will add additional ICP Brasil policy profiles in future versions as new ones are created.)
    // See https://www.gov.br/iti/pt-br/assuntos/repositorio/artefatos-de-assinatura-digital for more information.
    // 
    // PA_AD_RA --> 2.16.76.1.7.1.5.1
    // PA_AD_RA_v1_1 --> 2.16.76.1.7.1.5.1.1
    // PA_AD_RA_v1_2 --> 2.16.76.1.7.1.5.1.2
    // PA_AD_RA_v2_0 --> 2.16.76.1.7.1.5.2
    // PA_AD_RA_v2_1 --> 2.16.76.1.7.1.5.2.1
    // PA_AD_RA_v2_2 --> 2.16.76.1.7.1.5.2.2
    // PA_AD_RA_v2_3 --> 2.16.76.1.7.1.5.2.3
    // PA_AD_RA_v2_4 --> 2.16.76.1.7.1.5.2.4
    // PA_AD_RB --> 2.16.76.1.7.1.1.1
    // PA_AD_RB_v1_1 --> 2.16.76.1.7.1.1.1.1
    // PA_AD_RB_v2_0 --> 2.16.76.1.7.1.1.2
    // PA_AD_RB_v2_1 --> 2.16.76.1.7.1.1.2.1
    // PA_AD_RB_v2_2 --> 2.16.76.1.7.1.1.2.2
    // PA_AD_RB_v2_3 --> 2.16.76.1.7.1.1.2.3
    // PA_AD_RC --> 2.16.76.1.7.1.4.1
    // PA_AD_RC_v1_1 --> 2.16.76.1.7.1.4.1.1
    // PA_AD_RC_v2_0 --> 2.16.76.1.7.1.4.2
    // PA_AD_RC_v2_1 --> 2.16.76.1.7.1.4.2.1
    // PA_AD_RC_v2_2 --> 2.16.76.1.7.1.4.2.2
    // PA_AD_RC_v2_3 --> 2.16.76.1.7.1.4.2.3
    // PA_AD_RT --> 2.16.76.1.7.1.2.1
    // PA_AD_RT_v1_1 --> 2.16.76.1.7.1.2.1.1
    // PA_AD_RT_v2_0 --> 2.16.76.1.7.1.2.2
    // PA_AD_RT_v2_1 --> 2.16.76.1.7.1.2.2.1
    // PA_AD_RT_v2_2 --> 2.16.76.1.7.1.2.2.2
    // PA_AD_RT_v2_3 --> 2.16.76.1.7.1.2.2.3
    // PA_AD_RV --> 2.16.76.1.7.1.3.1
    // PA_AD_RV_v1_1 --> 2.16.76.1.7.1.3.1.1
    // PA_AD_RV_v2_0 --> 2.16.76.1.7.1.3.2
    // PA_AD_RV_v2_1 --> 2.16.76.1.7.1.3.2.1
    // PA_AD_RV_v2_2 --> 2.16.76.1.7.1.3.2.2
    // PA_AD_RV_v2_3 --> 2.16.76.1.7.1.3.2.3

    // Set the policy OID and the profile name
    jsonSigningAttrs.UpdateString("policyId.id","2.16.76.1.7.1.1.2.3")
    jsonSigningAttrs.UpdateString("policyId.profile","PA_AD_RB_v2_3")

    crypt.SetSigningAttributes(*jsonSigningAttrs.Emit())

    // The Brazil government validator requires the ASN.1 data to be in "constructed octets" form..
    crypt.SetUncommonOptions("UseConstructedOctets,OmitAlgorithmIdNull")
    crypt.SetIncludeCertChain(false)

    // Sign. 
    success = crypt.OpaqueSignBd(bd)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        crypt.DisposeCrypt2()
        bd.DisposeBinData()
        cert.DisposeCert()
        jsonSigningAttrs.DisposeJsonObject()
        return
    }

    // Save to a .p7s
    success = bd.WriteFile("qa_output/helloWorld.pdf.p7s")

    fmt.Println("Success")

    crypt.DisposeCrypt2()
    bd.DisposeBinData()
    cert.DisposeCert()
    jsonSigningAttrs.DisposeJsonObject()