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DataFlex Examples

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(DataFlex) Validate JWS with Multiple Signatures using the General JSON Serialization Format

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             |                    |
   +--------------+-------------------------------+--------------------+

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoSbRsaJwk
    Variant vRsaKey
    Handle hoRsaKey
    Boolean iSuccess
    Handle hoSbEccJwk
    Variant vEccKey
    Handle hoEccKey
    String sHmacKey
    Variant vSbJws
    Handle hoSbJws
    Handle hoJws
    Variant vProtHeader
    Handle hoProtHeader
    Handle hoSbKeyId
    Boolean iBCaseSensitive
    Integer iNumSignatures
    Integer i
    Integer v
    String sTemp1
    Boolean bTemp1

    //  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.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbRsaJwk
    If (Not(IsComObjectCreated(hoSbRsaJwk))) Begin
        Send CreateComObject of hoSbRsaJwk
    End
    Get ComAppend Of hoSbRsaJwk '{"kty":"RSA",' To iSuccess
    Get ComAppend Of hoSbRsaJwk '"n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx' To iSuccess
    Get ComAppend Of hoSbRsaJwk "HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs" To iSuccess
    Get ComAppend Of hoSbRsaJwk "D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH" To iSuccess
    Get ComAppend Of hoSbRsaJwk "SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV" To iSuccess
    Get ComAppend Of hoSbRsaJwk "MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8" To iSuccess
    Get ComAppend Of hoSbRsaJwk 'NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ",' To iSuccess
    Get ComAppend Of hoSbRsaJwk '"e":"AQAB"' To iSuccess
    Get ComAppend Of hoSbRsaJwk "}" To iSuccess

    Get Create (RefClass(cComChilkatPublicKey)) To hoRsaKey
    If (Not(IsComObjectCreated(hoRsaKey))) Begin
        Send CreateComObject of hoRsaKey
    End
    Get ComGetAsString Of hoSbRsaJwk To sTemp1
    Get ComLoadFromString Of hoRsaKey sTemp1 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRsaKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  ---------------------------------------------------
    //  Use the following ECC public key loaded from JWK format.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbEccJwk
    If (Not(IsComObjectCreated(hoSbEccJwk))) Begin
        Send CreateComObject of hoSbEccJwk
    End
    Get ComAppend Of hoSbEccJwk '{"kty":"EC",' To iSuccess
    Get ComAppend Of hoSbEccJwk '"crv":"P-256",' To iSuccess
    Get ComAppend Of hoSbEccJwk '"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",' To iSuccess
    Get ComAppend Of hoSbEccJwk '"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0"' To iSuccess
    Get ComAppend Of hoSbEccJwk "}" To iSuccess

    Get Create (RefClass(cComChilkatPublicKey)) To hoEccKey
    If (Not(IsComObjectCreated(hoEccKey))) Begin
        Send CreateComObject of hoEccKey
    End
    Get ComGetAsString Of hoSbEccJwk To sTemp1
    Get ComLoadFromString Of hoEccKey sTemp1 To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoEccKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  ---------------------------------------------------
    //  The HMAC key (in base64url format)
    Move "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow" To sHmacKey

    //  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"
    //      }
    //    ]
    //  }

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJws
    If (Not(IsComObjectCreated(hoSbJws))) Begin
        Send CreateComObject of hoSbJws
    End
    Get ComAppend Of hoSbJws "{ " To iSuccess
    Get ComAppend Of hoSbJws '  "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",' To iSuccess
    Get ComAppend Of hoSbJws '  "signatures": [' To iSuccess
    Get ComAppend Of hoSbJws "    { " To iSuccess
    Get ComAppend Of hoSbJws '      "protected": "eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0",' To iSuccess
    Get ComAppend Of hoSbJws '      "signature": "IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw"' To iSuccess
    Get ComAppend Of hoSbJws "    }," To iSuccess
    Get ComAppend Of hoSbJws "    { " To iSuccess
    Get ComAppend Of hoSbJws '      "protected": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ",' To iSuccess
    Get ComAppend Of hoSbJws '      "signature": "1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw"' To iSuccess
    Get ComAppend Of hoSbJws "    }," To iSuccess
    Get ComAppend Of hoSbJws "    { " To iSuccess
    Get ComAppend Of hoSbJws '      "protected": "eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0",' To iSuccess
    Get ComAppend Of hoSbJws '      "signature": "YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw"' To iSuccess
    Get ComAppend Of hoSbJws "    }" To iSuccess
    Get ComAppend Of hoSbJws "  ]" To iSuccess
    Get ComAppend Of hoSbJws "}" To iSuccess

    Get Create (RefClass(cComChilkatJws)) To hoJws
    If (Not(IsComObjectCreated(hoJws))) Begin
        Send CreateComObject of hoJws
    End

    Get pvComObject of hoSbJws to vSbJws
    Get ComLoadJwsSb Of hoJws vSbJws To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoJws To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  The payload is easily accessible:
    Get ComGetPayload Of hoJws "utf-8" To sTemp1
    Showln "Payload: " sTemp1

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbKeyId
    If (Not(IsComObjectCreated(hoSbKeyId))) Begin
        Send CreateComObject of hoSbKeyId
    End
    Move False To iBCaseSensitive

    Get ComNumSignatures Of hoJws To iNumSignatures
    Move 0 To i
    While (i < iNumSignatures)
        Get ComGetProtectedHeader Of hoJws i To vProtHeader
        If (IsComObject(vProtHeader)) Begin
            Get Create (RefClass(cComChilkatJsonObject)) To hoProtHeader
            Set pvComObject Of hoProtHeader To vProtHeader
        End

        Showln "--------------------------"
        Showln i ": "

        //  Get the protected header.
        Set ComEmitCompact Of hoProtHeader To False
        Get ComEmit Of hoProtHeader To sTemp1
        Showln sTemp1

        //  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).

        Send ComClear To hoSbKeyId
        Get ComStringOf Of hoProtHeader "kid" To sTemp1
        Get ComAppend Of hoSbKeyId sTemp1 To iSuccess

        //  Set the key based on key ID.
        Get ComContentsEqual Of hoSbKeyId "myRsaKey" iBCaseSensitive To bTemp1
        If (bTemp1 = True) Begin
            Get pvComObject of hoRsaKey to vRsaKey
            Get ComSetPublicKey Of hoJws i vRsaKey To iSuccess
        End

        Get ComContentsEqual Of hoSbKeyId "myEcKey" iBCaseSensitive To bTemp1
        If (bTemp1 = True) Begin
            Get pvComObject of hoEccKey to vEccKey
            Get ComSetPublicKey Of hoJws i vEccKey To iSuccess
        End

        Get ComContentsEqual Of hoSbKeyId "myMacKey" iBCaseSensitive To bTemp1
        If (bTemp1 = True) Begin
            Get ComSetMacKey Of hoJws i sHmacKey "base64url" To iSuccess
        End

        //  Validate this signature.
        Get ComValidate Of hoJws i To v
        If (v < 0) Begin
            //  Perhaps Chilkat was not unlocked or the trial expired..
            Showln "Validate failed for some other reason."
            Get ComLastErrorText Of hoJws To sTemp1
            Showln sTemp1
        End
        Else Begin
            If (v = 0) Begin
                Showln "Invalid signature.  The key was incorrect, the JWS was invalid, or both."
            End
            Else Begin
                Showln "Signature validated."
            End

        End

        Send Destroy of hoProtHeader
        Move i + 1 To i
    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.


End_Procedure

 

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