Xbase++

Load a JWE from a StringBuilder

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.LoadJweSb, which loads a JWE from a StringBuilder (here read from a file) so it can be decrypted.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

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.

Chilkat Xbase++ Downloads

Download Chilkat for Xbase++

Xbase++

LOCAL nSuccess
LOCAL oJwe
LOCAL oSbJwe
LOCAL nBLoaded
LOCAL cBase64Key
LOCAL cContent

nSuccess := 0

oJwe := CreateObject("Chilkat.Jwe")

//  The file path is relative to the application's current working directory.  An absolute path may
//  also be used.  Supply the path appropriate to your own environment.

//  Load the JWE text from a file into a StringBuilder.
oSbJwe := CreateObject("Chilkat.StringBuilder")
nBLoaded := oSbJwe:LoadFile("qa_data/message.jwe", "utf-8")
IF (nBLoaded != 1)
    ? "Failed to load the JWE file."
    oJwe:destroy()
    oSbJwe:destroy()
    RETURN
ENDIF

//  Load the JWE from the StringBuilder.
nSuccess := oJwe:LoadJweSb(oSbJwe)
IF (nSuccess == 0)
    ? oJwe:LastErrorText
    oJwe:destroy()
    oSbJwe:destroy()
    RETURN
ENDIF

//  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.
cBase64Key := "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
nSuccess := oJwe:SetWrappingKey(0, cBase64Key, "base64")
IF (nSuccess == 0)
    ? oJwe:LastErrorText
    oJwe:destroy()
    oSbJwe:destroy()
    RETURN
ENDIF

cContent := oJwe:Decrypt(0, "utf-8")
IF (oJwe:LastMethodSuccess == 0)
    ? oJwe:LastErrorText
    oJwe:destroy()
    oSbJwe:destroy()
    RETURN
ENDIF

? cContent

oJwe:destroy()
oSbJwe:destroy()