B4X

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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Dim success As Boolean = False

Dim jwe As ChilkatJwe
jwe.Initialize

'  Load a JWE from its compact serialization string.
Dim jweCompact As String = "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>"
success = jwe.LoadJwe(jweCompact)
If success = False Then
    Log(jwe.LastErrorText)
    Return
End If


'  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.
Dim base64Key As String = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0, base64Key, "base64")
If success = False Then
    Log(jwe.LastErrorText)
    Return
End If


'  The loaded JWE can now be decrypted.
Dim content As String = jwe.Decrypt(0, "utf-8")
If jwe.LastMethodSuccess = False Then
    Log(jwe.LastErrorText)
    Return
End If

Log(content)