CkPython

Set a Per-Recipient JWE Header

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetRecipientHeader, which sets the per-recipient unprotected header for a recipient index.

Background. Per-recipient headers carry recipient-specific values such as a key id (kid), and are used with the JSON serialization forms that support multiple recipients.

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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 the per-recipient unprotected header for recipient 0, for example a key id used to identify
#  which key a recipient should use.
recipHeader = chilkat.CkJsonObject()
recipHeader.UpdateString("kid","recipient-key-1")
success = jwe.SetRecipientHeader(0,recipHeader)
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())