DataFlex

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoJwe
    Variant vHeader
    Handle hoHeader
    String sBase64Key
    Variant vBdContent
    Handle hoBdContent
    Variant vSbJwe
    Handle hoSbJwe
    String sTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatJwe)) To hoJwe
    If (Not(IsComObjectCreated(hoJwe))) Begin
        Send CreateComObject of hoJwe
    End

    //  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
    //  encryption algorithm (enc).
    Get Create (RefClass(cComChilkatJsonObject)) To hoHeader
    If (Not(IsComObjectCreated(hoHeader))) Begin
        Send CreateComObject of hoHeader
    End
    Get ComUpdateString Of hoHeader "alg" "A256KW" To iSuccess
    Get ComUpdateString Of hoHeader "enc" "A256GCM" To iSuccess
    Get pvComObject of hoHeader to vHeader
    Get ComSetProtectedHeader Of hoJwe vHeader To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoJwe To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key
    //  from a secure source rather than hard-coding it.
    Move "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=" To sBase64Key
    Get ComSetWrappingKey Of hoJwe 0 sBase64Key "base64" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoJwe To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
    Get Create (RefClass(cComChilkatBinData)) To hoBdContent
    If (Not(IsComObjectCreated(hoBdContent))) Begin
        Send CreateComObject of hoBdContent
    End
    Get ComAppendString Of hoBdContent "Binary content to encrypt." "utf-8" To iSuccess

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJwe
    If (Not(IsComObjectCreated(hoSbJwe))) Begin
        Send CreateComObject of hoSbJwe
    End
    Get pvComObject of hoBdContent to vBdContent
    Get pvComObject of hoSbJwe to vSbJwe
    Get ComEncryptBd Of hoJwe vBdContent vSbJwe To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoJwe To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComGetAsString Of hoSbJwe To sTemp1
    Showln sTemp1


End_Procedure