CkPython

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a StringBuilder.

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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import sys
import chilkat

success = False

jwe = chilkat.CkJwe()

#  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
#  encryption algorithm (enc).
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()

#  Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
bdContent = chilkat.CkBinData()
bdContent.AppendString("Binary content to encrypt.","utf-8")

sbJwe = chilkat.CkStringBuilder()
success = jwe.EncryptBd(bdContent,sbJwe)
if (success == False):
    print(jwe.lastErrorText())
    sys.exit()

print(sbJwe.getAsString())