Tcl Requires Chilkat v11.0.0+
Tcl
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 Tcl Downloads
load ./chilkat.dll
set success 0
# 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.
set sbRsaJwk [new_CkStringBuilder]
CkStringBuilder_Append $sbRsaJwk "{\"kty\":\"RSA\","
CkStringBuilder_Append $sbRsaJwk "\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx"
CkStringBuilder_Append $sbRsaJwk "HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs"
CkStringBuilder_Append $sbRsaJwk "D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH"
CkStringBuilder_Append $sbRsaJwk "SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV"
CkStringBuilder_Append $sbRsaJwk "MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8"
CkStringBuilder_Append $sbRsaJwk "NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\","
CkStringBuilder_Append $sbRsaJwk "\"e\":\"AQAB\""
CkStringBuilder_Append $sbRsaJwk "}"
set rsaKey [new_CkPublicKey]
set success [CkPublicKey_LoadFromString $rsaKey [CkStringBuilder_getAsString $sbRsaJwk]]
if {$success == 0} then {
puts [CkPublicKey_lastErrorText $rsaKey]
delete_CkStringBuilder $sbRsaJwk
delete_CkPublicKey $rsaKey
exit
}
# ---------------------------------------------------
# Use the following ECC public key loaded from JWK format.
set sbEccJwk [new_CkStringBuilder]
CkStringBuilder_Append $sbEccJwk "{\"kty\":\"EC\","
CkStringBuilder_Append $sbEccJwk "\"crv\":\"P-256\","
CkStringBuilder_Append $sbEccJwk "\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\","
CkStringBuilder_Append $sbEccJwk "\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\""
CkStringBuilder_Append $sbEccJwk "}"
set eccKey [new_CkPublicKey]
set success [CkPublicKey_LoadFromString $eccKey [CkStringBuilder_getAsString $sbEccJwk]]
if {$success == 0} then {
puts [CkPublicKey_lastErrorText $eccKey]
delete_CkStringBuilder $sbRsaJwk
delete_CkPublicKey $rsaKey
delete_CkStringBuilder $sbEccJwk
delete_CkPublicKey $eccKey
exit
}
# ---------------------------------------------------
# The HMAC key (in base64url format)
set 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"
# }
# ]
# }
set sbJws [new_CkStringBuilder]
CkStringBuilder_Append $sbJws "{ "
CkStringBuilder_Append $sbJws " \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\","
CkStringBuilder_Append $sbJws " \"signatures\": ["
CkStringBuilder_Append $sbJws " { "
CkStringBuilder_Append $sbJws " \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\","
CkStringBuilder_Append $sbJws " \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\""
CkStringBuilder_Append $sbJws " },"
CkStringBuilder_Append $sbJws " { "
CkStringBuilder_Append $sbJws " \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\","
CkStringBuilder_Append $sbJws " \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\""
CkStringBuilder_Append $sbJws " },"
CkStringBuilder_Append $sbJws " { "
CkStringBuilder_Append $sbJws " \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\","
CkStringBuilder_Append $sbJws " \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\""
CkStringBuilder_Append $sbJws " }"
CkStringBuilder_Append $sbJws " ]"
CkStringBuilder_Append $sbJws "}"
set jws [new_CkJws]
set success [CkJws_LoadJwsSb $jws $sbJws]
if {$success == 0} then {
puts [CkJws_lastErrorText $jws]
delete_CkStringBuilder $sbRsaJwk
delete_CkPublicKey $rsaKey
delete_CkStringBuilder $sbEccJwk
delete_CkPublicKey $eccKey
delete_CkStringBuilder $sbJws
delete_CkJws $jws
exit
}
# The payload is easily accessible:
puts "Payload: [CkJws_getPayload $jws utf-8]"
set sbKeyId [new_CkStringBuilder]
set bCaseSensitive 0
set protHeader [new_CkJsonObject]
set numSignatures [CkJws_get_NumSignatures $jws]
set i 0
while {$i < $numSignatures} {
set success [CkJws_GetProtectedH $jws $i $protHeader]
if {$success == 0} then {
puts [CkJws_lastErrorText $jws]
delete_CkStringBuilder $sbRsaJwk
delete_CkPublicKey $rsaKey
delete_CkStringBuilder $sbEccJwk
delete_CkPublicKey $eccKey
delete_CkStringBuilder $sbJws
delete_CkJws $jws
delete_CkStringBuilder $sbKeyId
delete_CkJsonObject $protHeader
exit
}
puts "--------------------------"
puts "$i: "
# Get the protected header.
CkJsonObject_put_EmitCompact $protHeader 0
puts [CkJsonObject_emit $protHeader]
# 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).
CkStringBuilder_Clear $sbKeyId
CkStringBuilder_Append $sbKeyId [CkJsonObject_stringOf $protHeader "kid"]
# Set the key based on key ID.
if {[CkStringBuilder_ContentsEqual $sbKeyId "myRsaKey" $bCaseSensitive] == 1} then {
CkJws_SetPublicKey $jws $i $rsaKey
}
if {[CkStringBuilder_ContentsEqual $sbKeyId "myEcKey" $bCaseSensitive] == 1} then {
CkJws_SetPublicKey $jws $i $eccKey
}
if {[CkStringBuilder_ContentsEqual $sbKeyId "myMacKey" $bCaseSensitive] == 1} then {
CkJws_SetMacKey $jws $i $hmacKey "base64url"
}
# Validate this signature.
set v [CkJws_Validate $jws $i]
if {$v < 0} then {
# Perhaps Chilkat was not unlocked or the trial expired..
puts "Validate failed for some other reason."
puts [CkJws_lastErrorText $jws]
} else {
if {$v == 0} then {
puts "Invalid signature. The key was incorrect, the JWS was invalid, or both."
} else {
puts "Signature validated."
}
}
set i [expr $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.
delete_CkStringBuilder $sbRsaJwk
delete_CkPublicKey $rsaKey
delete_CkStringBuilder $sbEccJwk
delete_CkPublicKey $eccKey
delete_CkStringBuilder $sbJws
delete_CkJws $jws
delete_CkStringBuilder $sbKeyId
delete_CkJsonObject $protHeader