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(Visual FoxPro) Validate JWS with Multiple Signatures using the General JSON Serialization FormatValidates 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 | | +--------------+-------------------------------+--------------------+ Note: This example requires Chilkat v9.5.0.66 or greater.
LOCAL loSbRsaJwk LOCAL loRsaKey LOCAL lnSuccess LOCAL loSbEccJwk LOCAL loEccKey LOCAL lcHmacKey LOCAL loSbJws LOCAL loJws LOCAL loProtHeader LOCAL loSbKeyId LOCAL lnBCaseSensitive LOCAL lnNumSignatures LOCAL i LOCAL v * This requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * Note: This example requires Chilkat v9.5.0.66 or greater. * First, prepare the public keys that will be needed for each signature. * --------------------------------------------------- * Use the following RSA key loaded from JWK format. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbRsaJwk = CreateObject('Chilkat.StringBuilder') 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("}") * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey') loRsaKey = CreateObject('Chilkat.PublicKey') lnSuccess = loRsaKey.LoadFromString(loSbRsaJwk.GetAsString()) IF (lnSuccess <> 1) THEN ? loRsaKey.LastErrorText RELEASE loSbRsaJwk RELEASE loRsaKey CANCEL ENDIF * --------------------------------------------------- * Use the following ECC public key loaded from JWK format. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbEccJwk = CreateObject('Chilkat.StringBuilder') loSbEccJwk.Append('{"kty":"EC",') loSbEccJwk.Append('"crv":"P-256",') loSbEccJwk.Append('"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",') loSbEccJwk.Append('"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0"') loSbEccJwk.Append("}") * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey') loEccKey = CreateObject('Chilkat.PublicKey') lnSuccess = loEccKey.LoadFromString(loSbEccJwk.GetAsString()) IF (lnSuccess <> 1) THEN ? loEccKey.LastErrorText RELEASE loSbRsaJwk RELEASE loRsaKey RELEASE loSbEccJwk RELEASE loEccKey CANCEL 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" * } * ] * } * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbJws = CreateObject('Chilkat.StringBuilder') 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("}") * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Jws') loJws = CreateObject('Chilkat.Jws') lnSuccess = loJws.LoadJwsSb(loSbJws) IF (lnSuccess <> 1) THEN ? loJws.LastErrorText RELEASE loSbRsaJwk RELEASE loRsaKey RELEASE loSbEccJwk RELEASE loEccKey RELEASE loSbJws RELEASE loJws CANCEL ENDIF * The payload is easily accessible: ? "Payload: " + loJws.GetPayload("utf-8") * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbKeyId = CreateObject('Chilkat.StringBuilder') lnBCaseSensitive = 0 lnNumSignatures = loJws.NumSignatures i = 0 DO WHILE i < lnNumSignatures loProtHeader = loJws.GetProtectedHeader(i) ? "--------------------------" ? STR(i) + ": " * Get the protected header. loProtHeader.EmitCompact = 0 ? 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 GetUnprotectedHeader(i) instead of GetProtectedHeader(i). loSbKeyId.Clear() loSbKeyId.Append(loProtHeader.StringOf("kid")) * Set the key based on key ID. IF (loSbKeyId.ContentsEqual("myRsaKey",lnBCaseSensitive) = 1) THEN loJws.SetPublicKey(i,loRsaKey) ENDIF IF (loSbKeyId.ContentsEqual("myEcKey",lnBCaseSensitive) = 1) THEN loJws.SetPublicKey(i,loEccKey) ENDIF IF (loSbKeyId.ContentsEqual("myMacKey",lnBCaseSensitive) = 1) 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 RELEASE loProtHeader 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 |
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