Visual FoxPro

Encrypt Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.Encrypt, which encrypts a string and returns the resulting JWE. The charset argument converts the text to bytes before encryption.

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 Visual FoxPro Downloads

Download Chilkat for Visual FoxPro

Visual FoxPro

LOCAL lnSuccess
LOCAL loJwe
LOCAL loHeader
LOCAL lcBase64Key
LOCAL lcJweCompact

lnSuccess = 0

loJwe = CreateObject('Chilkat.Jwe')

*  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
*  encryption algorithm (enc).
loHeader = CreateObject('Chilkat.JsonObject')
loHeader.UpdateString("alg","A256KW")
loHeader.UpdateString("enc","A256GCM")
lnSuccess = loJwe.SetProtectedHeader(loHeader)
IF (lnSuccess = 0) THEN
    ? loJwe.LastErrorText
    RELEASE loJwe
    RELEASE loHeader
    CANCEL
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.
lcBase64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
lnSuccess = loJwe.SetWrappingKey(0,lcBase64Key,"base64")
IF (lnSuccess = 0) THEN
    ? loJwe.LastErrorText
    RELEASE loJwe
    RELEASE loHeader
    CANCEL
ENDIF

*  Encrypt the content.  The 2nd argument is the charset used to convert the text to bytes.  The
*  returned string is the JWE (compact serialization by default).
lcJweCompact = loJwe.Encrypt("This is the secret content.","utf-8")
IF (loJwe.LastMethodSuccess = 0) THEN
    ? loJwe.LastErrorText
    RELEASE loJwe
    RELEASE loHeader
    CANCEL
ENDIF

? lcJweCompact

RELEASE loJwe
RELEASE loHeader