Chilkat2-Python

Create a JWS into a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJwsSb, which creates a JWS and writes it into a StringBuilder.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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import sys
import chilkat2

success = False

jws = chilkat2.Jws()

# Set the protected header for signer 0, specifying the signature algorithm (alg).
header = chilkat2.JsonObject()
header.UpdateString("alg","HS256")
success = jws.SetProtectedHeader(0,header)
if (success == False):
    print(jws.LastErrorText)
    sys.exit()

# Set the payload to be signed.
bIncludeBom = False
success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom)
if (success == False):
    print(jws.LastErrorText)
    sys.exit()

# Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
# rather than hard-coding it.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
if (success == False):
    print(jws.LastErrorText)
    sys.exit()

# Create the JWS and write it into a StringBuilder.
sbJws = chilkat2.StringBuilder()
success = jws.CreateJwsSb(sbJws)
if (success == False):
    print(jws.LastErrorText)
    sys.exit()

print(sbJws.GetAsString())