Delphi ActiveX Requires Chilkat v11.0.0+
Delphi ActiveX
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 Delphi ActiveX Downloads
var
success: Integer;
sbRsaJwk: TChilkatStringBuilder;
rsaKey: TPublicKey;
sbEccJwk: TChilkatStringBuilder;
eccKey: TPublicKey;
hmacKey: WideString;
sbJws: TChilkatStringBuilder;
jws: TChilkatJws;
sbKeyId: TChilkatStringBuilder;
bCaseSensitive: Integer;
protHeader: TChilkatJsonObject;
numSignatures: Integer;
i: Integer;
v: Integer;
begin
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.
sbRsaJwk := TChilkatStringBuilder.Create(Self);
sbRsaJwk.Append('{"kty":"RSA",');
sbRsaJwk.Append('"n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx');
sbRsaJwk.Append('HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs');
sbRsaJwk.Append('D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH');
sbRsaJwk.Append('SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV');
sbRsaJwk.Append('MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8');
sbRsaJwk.Append('NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ",');
sbRsaJwk.Append('"e":"AQAB"');
sbRsaJwk.Append('}');
rsaKey := TPublicKey.Create(Self);
success := rsaKey.LoadFromString(sbRsaJwk.GetAsString());
if (success = 0) then
begin
Memo1.Lines.Add(rsaKey.LastErrorText);
Exit;
end;
// ---------------------------------------------------
// Use the following ECC public key loaded from JWK format.
sbEccJwk := TChilkatStringBuilder.Create(Self);
sbEccJwk.Append('{"kty":"EC",');
sbEccJwk.Append('"crv":"P-256",');
sbEccJwk.Append('"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",');
sbEccJwk.Append('"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0"');
sbEccJwk.Append('}');
eccKey := TPublicKey.Create(Self);
success := eccKey.LoadFromString(sbEccJwk.GetAsString());
if (success = 0) then
begin
Memo1.Lines.Add(eccKey.LastErrorText);
Exit;
end;
// ---------------------------------------------------
// The HMAC key (in base64url format)
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"
// }
// ]
// }
sbJws := TChilkatStringBuilder.Create(Self);
sbJws.Append('{ ');
sbJws.Append(' "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",');
sbJws.Append(' "signatures": [');
sbJws.Append(' { ');
sbJws.Append(' "protected": "eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0",');
sbJws.Append(' "signature": "IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw"');
sbJws.Append(' },');
sbJws.Append(' { ');
sbJws.Append(' "protected": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ",');
sbJws.Append(' "signature": "1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw"');
sbJws.Append(' },');
sbJws.Append(' { ');
sbJws.Append(' "protected": "eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0",');
sbJws.Append(' "signature": "YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw"');
sbJws.Append(' }');
sbJws.Append(' ]');
sbJws.Append('}');
jws := TChilkatJws.Create(Self);
success := jws.LoadJwsSb(sbJws.ControlInterface);
if (success = 0) then
begin
Memo1.Lines.Add(jws.LastErrorText);
Exit;
end;
// The payload is easily accessible:
Memo1.Lines.Add('Payload: ' + jws.GetPayload('utf-8'));
sbKeyId := TChilkatStringBuilder.Create(Self);
bCaseSensitive := 0;
protHeader := TChilkatJsonObject.Create(Self);
numSignatures := jws.NumSignatures;
i := 0;
while i < numSignatures do
begin
success := jws.GetProtectedH(i,protHeader.ControlInterface);
if (success = 0) then
begin
Memo1.Lines.Add(jws.LastErrorText);
Exit;
end;
Memo1.Lines.Add('--------------------------');
Memo1.Lines.Add(IntToStr(i) + ': ');
// Get the protected header.
protHeader.EmitCompact := 0;
Memo1.Lines.Add(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();
sbKeyId.Append(protHeader.StringOf('kid'));
// Set the key based on key ID.
if (sbKeyId.ContentsEqual('myRsaKey',bCaseSensitive) = 1) then
begin
jws.SetPublicKey(i,rsaKey.ControlInterface);
end;
if (sbKeyId.ContentsEqual('myEcKey',bCaseSensitive) = 1) then
begin
jws.SetPublicKey(i,eccKey.ControlInterface);
end;
if (sbKeyId.ContentsEqual('myMacKey',bCaseSensitive) = 1) then
begin
jws.SetMacKey(i,hmacKey,'base64url');
end;
// Validate this signature.
v := jws.Validate(i);
if (v < 0) then
begin
// Perhaps Chilkat was not unlocked or the trial expired..
Memo1.Lines.Add('Validate failed for some other reason.');
Memo1.Lines.Add(jws.LastErrorText);
end
else
begin
if (v = 0) then
begin
Memo1.Lines.Add('Invalid signature. The key was incorrect, the JWS was invalid, or both.');
end
else
begin
Memo1.Lines.Add('Signature validated.');
end;
end;
i := i + 1;
end;
// 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.