Chilkat2-Python

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 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 the per-recipient unprotected header for recipient 0, for example a key id used to identify
# which key a recipient should use.
recipHeader = chilkat2.JsonObject()
recipHeader.UpdateString("kid","recipient-key-1")
success = jwe.SetRecipientHeader(0,recipHeader)
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())