Visual FoxPro

Load a JWE from a String

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.LoadJwe, which loads a JWE from its compact serialization string so it can be decrypted.

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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Visual FoxPro

LOCAL lnSuccess
LOCAL loJwe
LOCAL lcJweCompact
LOCAL lcBase64Key
LOCAL lcContent

lnSuccess = 0

loJwe = CreateObject('Chilkat.Jwe')

*  Load a JWE from its compact serialization string.
lcJweCompact = "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>"
lnSuccess = loJwe.LoadJwe(lcJweCompact)
IF (lnSuccess = 0) THEN
    ? loJwe.LastErrorText
    RELEASE loJwe
    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
    CANCEL
ENDIF

*  The loaded JWE can now be decrypted.
lcContent = loJwe.Decrypt(0,"utf-8")
IF (loJwe.LastMethodSuccess = 0) THEN
    ? loJwe.LastErrorText
    RELEASE loJwe
    CANCEL
ENDIF

? lcContent

RELEASE loJwe