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 chilkat

success = False

jwe = chilkat.CkJwe()

#  Protected header: AES key-wrap with AES-256-GCM content encryption.
header = chilkat.CkJsonObject()
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 = chilkat.CkBinData()
bdAad.AppendString("context-info-v1","utf-8")
success = jwe.SetAadBd(bdAad)
if (success == False):
    print(jwe.lastErrorText())
    sys.exit()

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

print(sbJwe.getAsString())