(Chilkat2-Python) JWE using ECDH-ES, BP-256, A256GCM

See more JSON Web Encryption (JWE) Examples

Create a JWE with the following header:

	{
	  "alg": "ECDH-ES",
	  "enc": "A256GCM",
	  "exp": 1621957030,
	  "cty": "NJWT",
	  "epk": {
	    "kty": "EC",
	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
	    "crv": "BP-256"
	  }
	}

Note: This example requires Chilkat v9.5.0.87 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.

# Load our brainpool BP-256 public key.

# 	{
# 	  "use": "enc",
# 	  "kid": "puk_idp_enc",
# 	  "kty": "EC",
# 	  "crv": "BP-256",
# 	  "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w",
# 	  "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
# 	}

json = chilkat2.JsonObject()
json.UpdateString("use","enc")
json.UpdateString("kid","puk_idp_enc")
json.UpdateString("kty","EC")
json.UpdateString("crv","BP-256")
json.UpdateString("x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
json.UpdateString("y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")

pubkey = chilkat2.PublicKey()

success = pubkey.LoadFromString(json.Emit())
if (success == False):
    print(pubkey.LastErrorText)
    sys.exit()

# Build our protected header:

# 	{
# 	  "alg": "ECDH-ES",
# 	  "enc": "A256GCM",
# 	  "exp": 1621957030,
# 	  "cty": "NJWT",
# 	  "epk": {
# 	    "kty": "EC",
# 	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
# 	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
# 	    "crv": "BP-256"
# 	  }
# 	}

# Use jwt only for getting the current date/time + 3600 seconds.
jwt = chilkat2.Jwt()

jweProtHdr = chilkat2.JsonObject()
jweProtHdr.UpdateString("alg","ECDH-ES")
jweProtHdr.UpdateString("enc","A256GCM")
jweProtHdr.UpdateInt("exp",jwt.GenNumericDate(3600))
jweProtHdr.UpdateString("cty","NJWT")
jweProtHdr.UpdateString("epk.kty","EC")
jweProtHdr.UpdateString("epk.x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
jweProtHdr.UpdateString("epk.y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")
jweProtHdr.UpdateString("epk.crv","BP-256")

jwe = chilkat2.Jwe()
jwe.SetProtectedHeader(jweProtHdr)
jwe.SetPublicKey(0,pubkey)

plainText = "This is the text to be encrypted."
strJwe = jwe.Encrypt(plainText,"utf-8")
if (jwe.LastMethodSuccess != True):
    print(jwe.LastErrorText)
    sys.exit()

print(strJwe)

print("Success.")