(PureBasic) 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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IncludeFile "CkBinData.pb"
IncludeFile "CkCert.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkCrypt2.pb"

Procedure ChilkatExample()

    ; 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.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

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

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

    success.i = CkBinData::ckLoadFile(bd,inFile)
    If success = 0
        Debug "Failed to load " + inFile
        CkCrypt2::ckDispose(crypt)
        CkBinData::ckDispose(bd)
        ProcedureReturn
    EndIf

    ; We'll be using a certificate w/ private key stored on a smartcard for signing.
    cert.i = CkCert::ckCreate()
    If cert.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; If the smartcard or token requires a PIN, we can set it here to avoid the dialog...
    CkCert::setCkSmartCardPin(cert, "000000")

    success = CkCert::ckLoadFromSmartcard(cert,"")
    If success <> 1
        Debug CkCert::ckLastErrorText(cert)
        CkCrypt2::ckDispose(crypt)
        CkBinData::ckDispose(bd)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    ; Tell the crypt component to use this cert.
    success = CkCrypt2::ckSetSigningCert(crypt,cert)
    If success <> 1
        Debug CkCrypt2::ckLastErrorText(crypt)
        CkCrypt2::ckDispose(crypt)
        CkBinData::ckDispose(bd)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    ; Set properties for signing...
    CkCrypt2::setCkHashAlgorithm(crypt, "sha256")

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

    CkJsonObject::ckUpdateInt(jsonSigningAttrs,"contentType",1)
    CkJsonObject::ckUpdateInt(jsonSigningAttrs,"signingTime",1)
    CkJsonObject::ckUpdateInt(jsonSigningAttrs,"messageDigest",1)
    CkJsonObject::ckUpdateBool(jsonSigningAttrs,"signingCertificateV2",1)

    ; 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
    CkJsonObject::ckUpdateString(jsonSigningAttrs,"policyId.id","2.16.76.1.7.1.1.2.3")
    CkJsonObject::ckUpdateString(jsonSigningAttrs,"policyId.profile","PA_AD_RB_v2_3")

    CkCrypt2::setCkSigningAttributes(crypt, CkJsonObject::ckEmit(jsonSigningAttrs))

    ; The Brazil government validator requires the ASN.1 data to be in "constructed octets" form..
    CkCrypt2::setCkUncommonOptions(crypt, "UseConstructedOctets,OmitAlgorithmIdNull")
    CkCrypt2::setCkIncludeCertChain(crypt, 0)

    ; Sign. 
    success = CkCrypt2::ckOpaqueSignBd(crypt,bd)
    If success = 0
        Debug CkCrypt2::ckLastErrorText(crypt)
        CkCrypt2::ckDispose(crypt)
        CkBinData::ckDispose(bd)
        CkCert::ckDispose(cert)
        CkJsonObject::ckDispose(jsonSigningAttrs)
        ProcedureReturn
    EndIf

    ; Save to a .p7s
    success = CkBinData::ckWriteFile(bd,"qa_output/helloWorld.pdf.p7s")

    Debug "Success"


    CkCrypt2::ckDispose(crypt)
    CkBinData::ckDispose(bd)
    CkCert::ckDispose(cert)
    CkJsonObject::ckDispose(jsonSigningAttrs)


    ProcedureReturn
EndProcedure