Set JWE Additional Authenticated Data from BinData

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetAadBd, which sets external Additional Authenticated Data (AAD) to the exact bytes held in a BinData.

import sys
import chilkat2

success = False

jwe = chilkat2.Jwe()

# Protected header: AES key-wrap with AES-256-GCM content encryption.
header = chilkat2.JsonObject()
header.UpdateString("alg","A256KW")
header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
if (success == False):
    print(jwe.LastErrorText)
    sys.exit()

# 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.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0,base64Key,"base64")
if (success == False):
    print(jwe.LastErrorText)
    sys.exit()

# Set external Additional Authenticated Data (AAD) to the exact bytes in a BinData.  Passing an empty
# BinData clears any previously configured AAD.
bdAad = chilkat2.BinData()
bdAad.AppendString("context-info-v1","utf-8")
success = jwe.SetAadBd(bdAad)
if (success == False):
    print(jwe.LastErrorText)
    sys.exit()

sbContent = chilkat2.StringBuilder()
sbContent.Append("This is the secret content.")
sbJwe = chilkat2.StringBuilder()
success = jwe.EncryptSb(sbContent,"utf-8",sbJwe)
if (success == False):
    print(jwe.LastErrorText)
    sys.exit()

print(sbJwe.GetAsString())