(DataFlex) Create PKCS1 RSA Signature with PEM Private Key

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoPkey
    Boolean iSuccess
    String sPkeyXml
    Handle hoRsa
    String sStrData
    String sHexSig
    String sTemp1

    // This example assumes 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 RSA PEM file:
    Get ComLoadPemFile Of hoPkey "pvkey2_rsa.pem" To iSuccess

    // Get the private key in XML format:
    Get ComGetXml Of hoPkey To sPkeyXml

    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 ComImportPrivateKey Of hoRsa sPkeyXml To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRsa To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // This example will sign a string, and receive the signature
    // in a hex-encoded string.  Therefore, set the encoding mode
    // to "hex":
    Set ComEncodingMode Of hoRsa To "hex"

    // If some other non-Chilkat software is going to verify
    // the signature, it is important to match the byte-ordering.
    // The LittleEndian property may be set to True
    // for little-endian byte ordering, 
    // or False  for big-endian byte ordering.
    // Microsoft apps typically use little-endian, while
    // OpenSSL and other services (such as Amazon CloudFront)
    // use big-endian.
    Set ComLittleEndian Of hoRsa To False

    Move "This is the string to be signed." To sStrData

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "md2", "md5", "sha256",
    // "sha384", and "sha512".
    Get ComSignStringENC Of hoRsa sStrData "sha-1" To sHexSig

    Showln sHexSig

    Showln "Success!"


End_Procedure