(Chilkat2-Python) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

# This requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# Note: This example requires Chilkat v9.5.0.66 or greater.

# The JWS to be created will contain one signature using an ECDSA key.

sbEccJwk = chilkat2.StringBuilder()
sbEccJwk.Append("{\"kty\":\"EC\",")
sbEccJwk.Append("\"crv\":\"P-256\",")
sbEccJwk.Append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",")
sbEccJwk.Append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\",")
sbEccJwk.Append("\"d\":\"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI\"")
sbEccJwk.Append("}")

eccKey = chilkat2.PrivateKey()
# Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
# into the private key object. (See the online reference documentation..)
success = eccKey.LoadJwk(sbEccJwk.GetAsString())
if (success != True):
    print(eccKey.LastErrorText)
    sys.exit()

# ---------------------------------------------------
# Prepare both a protected and unprotected header.

jwsProtHdr = chilkat2.JsonObject()
jwsProtHdr.AppendString("alg","ES256")

jwsUnprotHdr = chilkat2.JsonObject()
jwsUnprotHdr.AppendString("kid","myEcKey")

# ---------------------------------------------------
jws = chilkat2.Jws()

jws.SetProtectedHeader(0,jwsProtHdr)
jws.SetUnprotectedHeader(0,jwsUnprotHdr)

jws.SetPrivateKey(0,eccKey)

bIncludeBom = False
payloadStr = "In our village, folks say God crumbles up the old moon into stars."
jws.SetPayload(payloadStr,"utf-8",bIncludeBom)

# ---------------------------------------------------
# Create the JWS.
# Indicate we prefer the non-compact, flattened serialization.
jws.PreferCompact = False
jws.PreferFlattened = True

jwsStr = jws.CreateJws()
if (jws.LastMethodSuccess != True):
    print(jws.LastErrorText)
    sys.exit()

# The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
# To get in human-readable format, load into a Chilkat JSON object and emit..
json = chilkat2.JsonObject()
json.Load(jwsStr)
json.EmitCompact = False
print(json.Emit())

# Sample output:

# { 
#   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
#   "protected": "eyJhbGciOiJFUzI1NiJ9",
#   "header": { 
#     "kid": "myEcKey"
#   },
#   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
# }