Zig Requires Chilkat v11.0.0+
Zig
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 Zig Downloads
const std = @import("std");
const chilkat = @import("chilkat");
pub fn main(init: std.process.Init) !void {
const alloc = init.arena.allocator();
// 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.
const sb_rsa_jwk = try chilkat.StringBuilder.init();
defer sb_rsa_jwk.deinit();
sb_rsa_jwk.append("{\"kty\":\"RSA\",") catch {};
sb_rsa_jwk.append("\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx") catch {};
sb_rsa_jwk.append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs") catch {};
sb_rsa_jwk.append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH") catch {};
sb_rsa_jwk.append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV") catch {};
sb_rsa_jwk.append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8") catch {};
sb_rsa_jwk.append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",") catch {};
sb_rsa_jwk.append("\"e\":\"AQAB\"") catch {};
sb_rsa_jwk.append("}") catch {};
const rsa_key = try chilkat.PublicKey.init();
defer rsa_key.deinit();
rsa_key.loadFromString(try sb_rsa_jwk.getAsString(alloc)) catch {
std.debug.print("{s}\n", .{try rsa_key.getLastErrorText(alloc)});
return;
};
// ---------------------------------------------------
// Use the following ECC public key loaded from JWK format.
const sb_ecc_jwk = try chilkat.StringBuilder.init();
defer sb_ecc_jwk.deinit();
sb_ecc_jwk.append("{\"kty\":\"EC\",") catch {};
sb_ecc_jwk.append("\"crv\":\"P-256\",") catch {};
sb_ecc_jwk.append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",") catch {};
sb_ecc_jwk.append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\"") catch {};
sb_ecc_jwk.append("}") catch {};
const ecc_key = try chilkat.PublicKey.init();
defer ecc_key.deinit();
ecc_key.loadFromString(try sb_ecc_jwk.getAsString(alloc)) catch {
std.debug.print("{s}\n", .{try ecc_key.getLastErrorText(alloc)});
return;
};
// ---------------------------------------------------
// The HMAC key (in base64url format)
const hmac_key = "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"
// }
// ]
// }
const sb_jws = try chilkat.StringBuilder.init();
defer sb_jws.deinit();
sb_jws.append("{ ") catch {};
sb_jws.append(" \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\",") catch {};
sb_jws.append(" \"signatures\": [") catch {};
sb_jws.append(" { ") catch {};
sb_jws.append(" \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\",") catch {};
sb_jws.append(" \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\"") catch {};
sb_jws.append(" },") catch {};
sb_jws.append(" { ") catch {};
sb_jws.append(" \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\",") catch {};
sb_jws.append(" \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\"") catch {};
sb_jws.append(" },") catch {};
sb_jws.append(" { ") catch {};
sb_jws.append(" \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\",") catch {};
sb_jws.append(" \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\"") catch {};
sb_jws.append(" }") catch {};
sb_jws.append(" ]") catch {};
sb_jws.append("}") catch {};
const jws = try chilkat.Jws.init();
defer jws.deinit();
jws.loadJwsSb(sb_jws) catch {
std.debug.print("{s}\n", .{try jws.getLastErrorText(alloc)});
return;
};
// The payload is easily accessible:
std.debug.print("Payload: {s}\n", .{try jws.getPayload(alloc, "utf-8")});
const sb_key_id = try chilkat.StringBuilder.init();
defer sb_key_id.deinit();
const b_case_sensitive = false;
const prot_header = try chilkat.JsonObject.init();
defer prot_header.deinit();
const num_signatures = jws.getNumSignatures();
var i: i32 = 0;
while (i < num_signatures) {
jws.getProtectedH(i, prot_header) catch {
std.debug.print("{s}\n", .{try jws.getLastErrorText(alloc)});
return;
};
std.debug.print("--------------------------\n", .{});
std.debug.print("{d}: \n", .{i});
// Get the protected header.
prot_header.setEmitCompact(false);
std.debug.print("{s}\n", .{try prot_header.emit(alloc)});
// 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).
sb_key_id.clear();
sb_key_id.append(try prot_header.stringOf(alloc, "kid")) catch {};
// Set the key based on key ID.
if (sb_key_id.contentsEqual("myRsaKey", b_case_sensitive)) {
jws.setPublicKey(i, rsa_key) catch {};
}
if (sb_key_id.contentsEqual("myEcKey", b_case_sensitive)) {
jws.setPublicKey(i, ecc_key) catch {};
}
if (sb_key_id.contentsEqual("myMacKey", b_case_sensitive)) {
jws.setMacKey(i, hmac_key, "base64url") catch {};
}
// Validate this signature.
const v = jws.validate(i);
if (v < 0) {
// Perhaps Chilkat was not unlocked or the trial expired..
std.debug.print("Validate failed for some other reason.\n", .{});
std.debug.print("{s}\n", .{try jws.getLastErrorText(alloc)});
} else {
if (v == 0) {
std.debug.print("Invalid signature. The key was incorrect, the JWS was invalid, or both.\n", .{});
} else {
std.debug.print("Signature validated.\n", .{});
}
}
i = i + 1;
}
// 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.
}