(PureBasic) AddDetachedSignaturePk

Demonstrates how to add a detached signature using a certifcate and it's corresponding private key. The easiest way of doing it is when both the certificate and private key are contained together within a PFX (.pfx or .p12) file. This example demonstrates how to use the certificate and its corresponding private key when they are stored in separate files -- a .cer for the certificate, and a .pem for the private key.

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IncludeFile "CkCert.pb"
IncludeFile "CkMime.pb"
IncludeFile "CkPrivateKey.pb"

Procedure ChilkatExample()

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

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

    ; Load the certificate from a .cer file.
    cert.i = CkCert::ckCreate()
    If cert.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = CkCert::ckLoadFromFile(cert,"aaworkarea/myCert.cer")
    If success = 0
        Debug CkCert::ckLastErrorText(cert)
        CkMime::ckDispose(mime)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    ; Load the private key from an encrypted PEM file.
    ; (A private key can be loaded from other file formats also..)
    privKey.i = CkPrivateKey::ckCreate()
    If privKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckLoadEncryptedPemFile(privKey,"aaworkarea/myPrivateKey.pem","myPassword")
    If success = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkMime::ckDispose(mime)
        CkCert::ckDispose(cert)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    success = CkMime::ckSetBodyFromPlainText(mime,"This is the plain-text MIME body.")

    ; Sign the MIME (adds a PKCS7 detached signature)
    success = CkMime::ckAddDetachedSignaturePk(mime,cert,privKey)
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        CkCert::ckDispose(cert)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    ; Save the S/MIME to a file.
    success = CkMime::ckSaveMime(mime,"aaworkarea/signedMime.txt")
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        CkCert::ckDispose(cert)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    Debug "success!"


    CkMime::ckDispose(mime)
    CkCert::ckDispose(cert)
    CkPrivateKey::ckDispose(privKey)


    ProcedureReturn
EndProcedure