Lianja
Lianja
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 Lianja Downloads
llSuccess = .F.
// 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.
loSbRsaJwk = createobject("CkStringBuilder")
loSbRsaJwk.Append('{"kty":"RSA",')
loSbRsaJwk.Append('"n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx')
loSbRsaJwk.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
loSbRsaJwk.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
loSbRsaJwk.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
loSbRsaJwk.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
loSbRsaJwk.Append('NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ",')
loSbRsaJwk.Append('"e":"AQAB"')
loSbRsaJwk.Append("}")
loRsaKey = createobject("CkPublicKey")
llSuccess = loRsaKey.LoadFromString(loSbRsaJwk.GetAsString())
if (llSuccess = .F.) then
? loRsaKey.LastErrorText
release loSbRsaJwk
release loRsaKey
return
endif
// ---------------------------------------------------
// Use the following ECC public key loaded from JWK format.
loSbEccJwk = createobject("CkStringBuilder")
loSbEccJwk.Append('{"kty":"EC",')
loSbEccJwk.Append('"crv":"P-256",')
loSbEccJwk.Append('"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",')
loSbEccJwk.Append('"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0"')
loSbEccJwk.Append("}")
loEccKey = createobject("CkPublicKey")
llSuccess = loEccKey.LoadFromString(loSbEccJwk.GetAsString())
if (llSuccess = .F.) then
? loEccKey.LastErrorText
release loSbRsaJwk
release loRsaKey
release loSbEccJwk
release loEccKey
return
endif
// ---------------------------------------------------
// The HMAC key (in base64url format)
lcHmacKey = "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"
// }
// ]
// }
loSbJws = createobject("CkStringBuilder")
loSbJws.Append("{ ")
loSbJws.Append(' "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",')
loSbJws.Append(' "signatures": [')
loSbJws.Append(" { ")
loSbJws.Append(' "protected": "eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0",')
loSbJws.Append(' "signature": "IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw"')
loSbJws.Append(" },")
loSbJws.Append(" { ")
loSbJws.Append(' "protected": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ",')
loSbJws.Append(' "signature": "1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw"')
loSbJws.Append(" },")
loSbJws.Append(" { ")
loSbJws.Append(' "protected": "eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0",')
loSbJws.Append(' "signature": "YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw"')
loSbJws.Append(" }")
loSbJws.Append(" ]")
loSbJws.Append("}")
loJws = createobject("CkJws")
llSuccess = loJws.LoadJwsSb(loSbJws)
if (llSuccess = .F.) then
? loJws.LastErrorText
release loSbRsaJwk
release loRsaKey
release loSbEccJwk
release loEccKey
release loSbJws
release loJws
return
endif
// The payload is easily accessible:
? "Payload: " + loJws.GetPayload("utf-8")
loSbKeyId = createobject("CkStringBuilder")
llBCaseSensitive = .F.
loProtHeader = createobject("CkJsonObject")
lnNumSignatures = loJws.NumSignatures
i = 0
do while i < lnNumSignatures
llSuccess = loJws.GetProtectedH(i,loProtHeader)
if (llSuccess = .F.) then
? loJws.LastErrorText
release loSbRsaJwk
release loRsaKey
release loSbEccJwk
release loEccKey
release loSbJws
release loJws
release loSbKeyId
release loProtHeader
return
endif
? "--------------------------"
? str(i) + ": "
// Get the protected header.
loProtHeader.EmitCompact = .F.
? loProtHeader.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).
loSbKeyId.Clear()
loSbKeyId.Append(loProtHeader.StringOf("kid"))
// Set the key based on key ID.
if (loSbKeyId.ContentsEqual("myRsaKey",llBCaseSensitive) = .T.) then
loJws.SetPublicKey(i,loRsaKey)
endif
if (loSbKeyId.ContentsEqual("myEcKey",llBCaseSensitive) = .T.) then
loJws.SetPublicKey(i,loEccKey)
endif
if (loSbKeyId.ContentsEqual("myMacKey",llBCaseSensitive) = .T.) then
loJws.SetMacKey(i,lcHmacKey,"base64url")
endif
// Validate this signature.
v = loJws.Validate(i)
if (v < 0) then
// Perhaps Chilkat was not unlocked or the trial expired..
? "Validate failed for some other reason."
? loJws.LastErrorText
else
if (v = 0) then
? "Invalid signature. The key was incorrect, the JWS was invalid, or both."
else
? "Signature validated."
endif
endif
i = i + 1
enddo
// 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.
release loSbRsaJwk
release loRsaKey
release loSbEccJwk
release loEccKey
release loSbJws
release loJws
release loSbKeyId
release loProtHeader