Visual Basic 6.0
Visual Basic 6.0
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 Visual Basic 6.0 Downloads
Dim success As Long
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.
Dim sbRsaJwk As New ChilkatStringBuilder
success = sbRsaJwk.Append("{""kty"":""RSA"",")
success = sbRsaJwk.Append("""n"":""ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
success = sbRsaJwk.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
success = sbRsaJwk.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
success = sbRsaJwk.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
success = sbRsaJwk.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
success = sbRsaJwk.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ"",")
success = sbRsaJwk.Append("""e"":""AQAB""")
success = sbRsaJwk.Append("}")
Dim rsaKey As New PublicKey
success = rsaKey.LoadFromString(sbRsaJwk.GetAsString())
If (success = 0) Then
Debug.Print rsaKey.LastErrorText
Exit Sub
End If
' ---------------------------------------------------
' Use the following ECC public key loaded from JWK format.
Dim sbEccJwk As New ChilkatStringBuilder
success = sbEccJwk.Append("{""kty"":""EC"",")
success = sbEccJwk.Append("""crv"":""P-256"",")
success = sbEccJwk.Append("""x"":""f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU"",")
success = sbEccJwk.Append("""y"":""x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0""")
success = sbEccJwk.Append("}")
Dim eccKey As New PublicKey
success = eccKey.LoadFromString(sbEccJwk.GetAsString())
If (success = 0) Then
Debug.Print eccKey.LastErrorText
Exit Sub
End If
' ---------------------------------------------------
' The HMAC key (in base64url format)
Dim hmacKey As String
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"
' }
' ]
' }
Dim sbJws As New ChilkatStringBuilder
success = sbJws.Append("{ ")
success = sbJws.Append(" ""payload"": ""SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu"",")
success = sbJws.Append(" ""signatures"": [")
success = sbJws.Append(" { ")
success = sbJws.Append(" ""protected"": ""eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0"",")
success = sbJws.Append(" ""signature"": ""IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw""")
success = sbJws.Append(" },")
success = sbJws.Append(" { ")
success = sbJws.Append(" ""protected"": ""eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ"",")
success = sbJws.Append(" ""signature"": ""1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw""")
success = sbJws.Append(" },")
success = sbJws.Append(" { ")
success = sbJws.Append(" ""protected"": ""eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0"",")
success = sbJws.Append(" ""signature"": ""YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw""")
success = sbJws.Append(" }")
success = sbJws.Append(" ]")
success = sbJws.Append("}")
Dim jws As New ChilkatJws
success = jws.LoadJwsSb(sbJws)
If (success = 0) Then
Debug.Print jws.LastErrorText
Exit Sub
End If
' The payload is easily accessible:
Debug.Print "Payload: " & jws.GetPayload("utf-8")
Dim sbKeyId As New ChilkatStringBuilder
Dim bCaseSensitive As Long
bCaseSensitive = 0
Dim protHeader As New ChilkatJsonObject
Dim numSignatures As Long
numSignatures = jws.NumSignatures
Dim i As Long
i = 0
Do While i < numSignatures
success = jws.GetProtectedH(i,protHeader)
If (success = 0) Then
Debug.Print jws.LastErrorText
Exit Sub
End If
Debug.Print "--------------------------"
Debug.Print i & ": "
' Get the protected header.
protHeader.EmitCompact = 0
Debug.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
success = sbKeyId.Append(protHeader.StringOf("kid"))
' Set the key based on key ID.
If (sbKeyId.ContentsEqual("myRsaKey",bCaseSensitive) = 1) Then
success = jws.SetPublicKey(i,rsaKey)
End If
If (sbKeyId.ContentsEqual("myEcKey",bCaseSensitive) = 1) Then
success = jws.SetPublicKey(i,eccKey)
End If
If (sbKeyId.ContentsEqual("myMacKey",bCaseSensitive) = 1) Then
success = jws.SetMacKey(i,hmacKey,"base64url")
End If
' Validate this signature.
Dim v As Long
v = jws.Validate(i)
If (v < 0) Then
' Perhaps Chilkat was not unlocked or the trial expired..
Debug.Print "Validate failed for some other reason."
Debug.Print jws.LastErrorText
Else
If (v = 0) Then
Debug.Print "Invalid signature. The key was incorrect, the JWS was invalid, or both."
Else
Debug.Print "Signature validated."
End If
End If
i = i + 1
Loop
' 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.