DataFlex

Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

See more OpenSSL Examples

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:

1. Creates a SHA256 digest of the contents of the input file
2. Signs the SHA256 digest using the private key.

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vPkey
    Handle hoPkey
    Handle hoRsa
    Variant vBdFileData
    Handle hoBdFileData
    Variant vBdSig
    Handle hoBdSig
    String sTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatPrivateKey)) To hoPkey
    If (Not(IsComObjectCreated(hoPkey))) Begin
        Send CreateComObject of hoPkey
    End

    // Load the private key from an PEM file:
    Get ComLoadPemFile Of hoPkey "private.pem" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPkey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatRsa)) To hoRsa
    If (Not(IsComObjectCreated(hoRsa))) Begin
        Send CreateComObject of hoRsa
    End

    // Import the private key into the RSA component:
    Get pvComObject of hoPkey to vPkey
    Get ComUsePrivateKey Of hoRsa vPkey To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoRsa To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // OpenSSL uses big-endian.
    Set ComLittleEndian Of hoRsa To False

    // Load the file to be signed.
    Get Create (RefClass(cComChilkatBinData)) To hoBdFileData
    If (Not(IsComObjectCreated(hoBdFileData))) Begin
        Send CreateComObject of hoBdFileData
    End
    Get ComLoadFile Of hoBdFileData "in.dat" To iSuccess

    Get Create (RefClass(cComChilkatBinData)) To hoBdSig
    If (Not(IsComObjectCreated(hoBdSig))) Begin
        Send CreateComObject of hoBdSig
    End
    Get pvComObject of hoBdFileData to vBdFileData
    Get pvComObject of hoBdSig to vBdSig
    Get ComSignBd Of hoRsa vBdFileData "sha256" vBdSig To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoRsa To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Save the binary signature to a file.
    Get ComWriteFile Of hoBdSig "signature.sig" To iSuccess
    If (iSuccess <> True) Begin
        Showln "Failed to write signature.sig."
        Procedure_Return
    End

    Showln "Success."


End_Procedure