Xbase++

Decrypt a JWE into a StringBuilder

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.DecryptSb, which decrypts a recipient of a loaded JWE and writes the plaintext into a StringBuilder.

Background. The recipient index selects which recipient's key material to use. The key for that recipient must be provided before decrypting.

Chilkat Xbase++ Downloads

Download Chilkat for Xbase++

Xbase++

LOCAL nSuccess
LOCAL oJwe
LOCAL cJweCompact
LOCAL cBase64Key
LOCAL oSbContent

nSuccess := 0

oJwe := CreateObject("Chilkat.Jwe")

//  Load the JWE compact serialization to be decrypted.
cJweCompact := "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>"
nSuccess := oJwe:LoadJwe(cJweCompact)
IF (nSuccess == 0)
    ? oJwe:LastErrorText
    oJwe: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()
    RETURN
ENDIF

//  Decrypt recipient index 0, writing the plaintext into a StringBuilder.
oSbContent := CreateObject("Chilkat.StringBuilder")
nSuccess := oJwe:DecryptSb(0, "utf-8", oSbContent)
IF (nSuccess == 0)
    ? oJwe:LastErrorText
    oJwe:destroy()
    oSbContent:destroy()
    RETURN
ENDIF

? oSbContent:GetAsString()

oJwe:destroy()
oSbContent:destroy()