CkPython Requires Chilkat v11.0.0+
CkPython
Validate JWS with Multiple Signatures using the General JSON Serialization Format
See more JSON Web Signatures (JWS) Examples
Validates and recovers data and headers from a JSON Web Signature (JWS) containing 3 signatures.Note: Chilkat supports all of the following JWS algorithms:
+--------------+-------------------------------+--------------------+ | "alg" Param | Digital Signature or MAC | Implementation | | Value | Algorithm | Requirements | +--------------+-------------------------------+--------------------+ | HS256 | HMAC using SHA-256 | Required | | HS384 | HMAC using SHA-384 | Optional | | HS512 | HMAC using SHA-512 | Optional | | RS256 | RSASSA-PKCS1-v1_5 using | Recommended | | | SHA-256 | | | RS384 | RSASSA-PKCS1-v1_5 using | Optional | | | SHA-384 | | | RS512 | RSASSA-PKCS1-v1_5 using | Optional | | | SHA-512 | | | ES256 | ECDSA using P-256 and SHA-256 | Recommended+ | | ES384 | ECDSA using P-384 and SHA-384 | Optional | | ES512 | ECDSA using P-521 and SHA-512 | Optional | | PS256 | RSASSA-PSS using SHA-256 and | Optional | | | MGF1 with SHA-256 | | | PS384 | RSASSA-PSS using SHA-384 and | Optional | | | MGF1 with SHA-384 | | | PS512 | RSASSA-PSS using SHA-512 and | Optional | | | MGF1 with SHA-512 | | +--------------+-------------------------------+--------------------+
Chilkat CkPython Downloads
import sys
import chilkat
success = False
# This requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.
# First, prepare the public keys that will be needed for each signature.
# ---------------------------------------------------
# Use the following RSA key loaded from JWK format.
sbRsaJwk = chilkat.CkStringBuilder()
sbRsaJwk.Append("{\"kty\":\"RSA\",")
sbRsaJwk.Append("\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
sbRsaJwk.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
sbRsaJwk.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
sbRsaJwk.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
sbRsaJwk.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
sbRsaJwk.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",")
sbRsaJwk.Append("\"e\":\"AQAB\"")
sbRsaJwk.Append("}")
rsaKey = chilkat.CkPublicKey()
success = rsaKey.LoadFromString(sbRsaJwk.getAsString())
if (success == False):
print(rsaKey.lastErrorText())
sys.exit()
# ---------------------------------------------------
# Use the following ECC public key loaded from JWK format.
sbEccJwk = chilkat.CkStringBuilder()
sbEccJwk.Append("{\"kty\":\"EC\",")
sbEccJwk.Append("\"crv\":\"P-256\",")
sbEccJwk.Append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",")
sbEccJwk.Append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\"")
sbEccJwk.Append("}")
eccKey = chilkat.CkPublicKey()
success = eccKey.LoadFromString(sbEccJwk.getAsString())
if (success == False):
print(eccKey.lastErrorText())
sys.exit()
# ---------------------------------------------------
# The HMAC key (in base64url format)
hmacKey = "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow"
# The code below will verify each of the signatures in this JWS:
# {
# "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
# "signatures": [
# {
# "protected": "eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0",
# "signature": "IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw"
# },
# {
# "protected": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ",
# "signature": "1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw"
# },
# {
# "protected": "eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0",
# "signature": "YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw"
# }
# ]
# }
sbJws = chilkat.CkStringBuilder()
sbJws.Append("{ ")
sbJws.Append(" \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\",")
sbJws.Append(" \"signatures\": [")
sbJws.Append(" { ")
sbJws.Append(" \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\",")
sbJws.Append(" \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\"")
sbJws.Append(" },")
sbJws.Append(" { ")
sbJws.Append(" \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\",")
sbJws.Append(" \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\"")
sbJws.Append(" },")
sbJws.Append(" { ")
sbJws.Append(" \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\",")
sbJws.Append(" \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\"")
sbJws.Append(" }")
sbJws.Append(" ]")
sbJws.Append("}")
jws = chilkat.CkJws()
success = jws.LoadJwsSb(sbJws)
if (success == False):
print(jws.lastErrorText())
sys.exit()
# The payload is easily accessible:
print("Payload: " + jws.getPayload("utf-8"))
sbKeyId = chilkat.CkStringBuilder()
bCaseSensitive = False
protHeader = chilkat.CkJsonObject()
numSignatures = jws.get_NumSignatures()
i = 0
while i < numSignatures :
success = jws.GetProtectedH(i,protHeader)
if (success == False):
print(jws.lastErrorText())
sys.exit()
print("--------------------------")
print(str(i) + ": ")
# Get the protected header.
protHeader.put_EmitCompact(False)
print(protHeader.emit())
# Get the key ID ("kid") member.
# Note: In this example, the "kid" values are contained in the protected headers.
# They could've just as easily been located in unprotected headers. In that case,
# we would've called GetUnprotectedH instead of GetProtectedH(i).
sbKeyId.Clear()
sbKeyId.Append(protHeader.stringOf("kid"))
# Set the key based on key ID.
if (sbKeyId.ContentsEqual("myRsaKey",bCaseSensitive) == True):
jws.SetPublicKey(i,rsaKey)
if (sbKeyId.ContentsEqual("myEcKey",bCaseSensitive) == True):
jws.SetPublicKey(i,eccKey)
if (sbKeyId.ContentsEqual("myMacKey",bCaseSensitive) == True):
jws.SetMacKey(i,hmacKey,"base64url")
# Validate this signature.
v = jws.Validate(i)
if (v < 0):
# Perhaps Chilkat was not unlocked or the trial expired..
print("Validate failed for some other reason.")
print(jws.lastErrorText())
else:
if (v == 0):
print("Invalid signature. The key was incorrect, the JWS was invalid, or both.")
else:
print("Signature validated.")
i = i + 1
# The output of this program is:
# Payload: In our village, folks say God crumbles up the old moon into stars.
# --------------------------
# 0:
# {
# "alg": "RS256",
# "kid": "myRsaKey"
# }
#
# Signature validated.
# --------------------------
# 1:
# {
# "alg": "ES256",
# "kid": "myEcKey"
# }
#
# Signature validated.
# --------------------------
# 2:
# {
# "alg": "HS256",
# "kid": "myMacKey"
# }
#
# Signature validated.