Decrypt S/MIME using Added Credential Sources

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

The recipient's certificate and private key are supplied from a PFX added with AddPfxSourceFile, and Decrypt automatically selects the matching private key based on the CMS recipient information.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

IncludeFile "CkMime.pb"

Procedure ChilkatExample()

    success.i = 0

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

    success = CkMime::ckLoadMimeFile(mime,"qa_data/encrypted.eml")
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        ProcedureReturn
    EndIf

    ;  Load the recipient's certificate and private key (from a PFX) so decryption can find them.  The
    ;  PFX password should come from a secure source rather than being hard-coded.
    pfxPassword.s = "myPfxPassword"
    success = CkMime::ckAddPfxSourceFile(mime,"qa_data/recipient.pfx",pfxPassword)
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        ProcedureReturn
    EndIf

    ;  Decrypt.  Chilkat identifies the correct recipient from the CMS recipient info and uses the
    ;  matching private key from the added sources.
    success = CkMime::ckDecrypt(mime)
    If success = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        ProcedureReturn
    EndIf

    body.s = CkMime::ckGetBodyDecoded(mime)
    If CkMime::ckLastMethodSuccess(mime) = 0
        Debug CkMime::ckLastErrorText(mime)
        CkMime::ckDispose(mime)
        ProcedureReturn
    EndIf

    Debug body


    CkMime::ckDispose(mime)


    ProcedureReturn
EndProcedure