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DataFlex Examples

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(DataFlex) Verify and Unwrap PCKS7 Signed MIME

Demonstrates calling the Verify method to verify and unwrap PKCS7 signed MIME. The MIME is restored to the original structure that it would have originally had prior to signing. The Verify method works with both detached signatures, as well as opaque/attached signatures.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoMime
    Boolean iSuccess
    Boolean iVerified
    String sTemp1

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

    Get Create (RefClass(cComChilkatMime)) To hoMime
    If (Not(IsComObjectCreated(hoMime))) Begin
        Send CreateComObject of hoMime
    End

    // A PKCS7 signature usually embeds both the signing
    // certificate with its public key.  Therefore, it is usually 
    // possible to verify a signature without the need to 
    // already have the certificate installed.

    // Load the signed MIME from a file...
    Get ComLoadMimeFile Of hoMime "signedMime.txt" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMime To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Verify the signed MIME and restore the MIME
    // to the structure/content it had prior to signing.

    Get ComVerify Of hoMime To iVerified
    If (iVerified = False) Begin
        Get ComLastErrorText Of hoMime To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Examine the MIME after signature verification (i.e. "unwrapping")
    Get ComGetMime Of hoMime To sTemp1
    Showln sTemp1


End_Procedure

 

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