Zig Requires Chilkat v11.0.0+
Zig
JWS Using RSASSA-PSS using SHA-256 and MGF1 with SHA-256
See more JSON Web Signatures (JWS) Examples
Creates and validates a JSON Web Signature (JWS) using RSASSA-PSS using SHA-256 and MGF1 with SHA-256.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.
// Note: This example requires Chilkat v9.5.0.66 or greater.
// Use the following RSA key loaded from JWK format.
const sb_jwk = try chilkat.StringBuilder.init();
defer sb_jwk.deinit();
sb_jwk.append("{\"kty\":\"RSA\",") catch {};
sb_jwk.append("\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx") catch {};
sb_jwk.append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs") catch {};
sb_jwk.append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH") catch {};
sb_jwk.append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV") catch {};
sb_jwk.append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8") catch {};
sb_jwk.append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",") catch {};
sb_jwk.append("\"e\":\"AQAB\",") catch {};
sb_jwk.append("\"d\":\"Eq5xpGnNCivDflJsRQBXHx1hdR1k6Ulwe2JZD50LpXyWPEAeP88vLNO97I") catch {};
sb_jwk.append("jlA7_GQ5sLKMgvfTeXZx9SE-7YwVol2NXOoAJe46sui395IW_GO-pWJ1O0") catch {};
sb_jwk.append("BkTGoVEn2bKVRUCgu-GjBVaYLU6f3l9kJfFNS3E0QbVdxzubSu3Mkqzjkn") catch {};
sb_jwk.append("439X0M_V51gfpRLI9JYanrC4D4qAdGcopV_0ZHHzQlBjudU2QvXt4ehNYT") catch {};
sb_jwk.append("CBr6XCLQUShb1juUO1ZdiYoFaFQT5Tw8bGUl_x_jTj3ccPDVZFD9pIuhLh") catch {};
sb_jwk.append("BOneufuBiB4cS98l2SR_RQyGWSeWjnczT0QU91p1DhOVRuOopznQ\",") catch {};
sb_jwk.append("\"p\":\"4BzEEOtIpmVdVEZNCqS7baC4crd0pqnRH_5IB3jw3bcxGn6QLvnEtfdUdi") catch {};
sb_jwk.append("YrqBdss1l58BQ3KhooKeQTa9AB0Hw_Py5PJdTJNPY8cQn7ouZ2KKDcmnPG") catch {};
sb_jwk.append("BY5t7yLc1QlQ5xHdwW1VhvKn-nXqhJTBgIPgtldC-KDV5z-y2XDwGUc\",") catch {};
sb_jwk.append("\"q\":\"uQPEfgmVtjL0Uyyx88GZFF1fOunH3-7cepKmtH4pxhtCoHqpWmT8YAmZxa") catch {};
sb_jwk.append("ewHgHAjLYsp1ZSe7zFYHj7C6ul7TjeLQeZD_YwD66t62wDmpe_HlB-TnBA") catch {};
sb_jwk.append("-njbglfIsRLtXlnDzQkv5dTltRJ11BKBBypeeF6689rjcJIDEz9RWdc\",") catch {};
sb_jwk.append("\"dp\":\"BwKfV3Akq5_MFZDFZCnW-wzl-CCo83WoZvnLQwCTeDv8uzluRSnm71I3Q") catch {};
sb_jwk.append("CLdhrqE2e9YkxvuxdBfpT_PI7Yz-FOKnu1R6HsJeDCjn12Sk3vmAktV2zb") catch {};
sb_jwk.append("34MCdy7cpdTh_YVr7tss2u6vneTwrA86rZtu5Mbr1C1XsmvkxHQAdYo0\",") catch {};
sb_jwk.append("\"dq\":\"h_96-mK1R_7glhsum81dZxjTnYynPbZpHziZjeeHcXYsXaaMwkOlODsWa") catch {};
sb_jwk.append("7I9xXDoRwbKgB719rrmI2oKr6N3Do9U0ajaHF-NKJnwgjMd2w9cjz3_-ky") catch {};
sb_jwk.append("NlxAr2v4IKhGNpmM5iIgOS1VZnOZ68m6_pbLBSp3nssTdlqvd0tIiTHU\",") catch {};
sb_jwk.append("\"qi\":\"IYd7DHOhrWvxkwPQsRM2tOgrjbcrfvtQJipd-DlcxyVuuM9sQLdgjVk2o") catch {};
sb_jwk.append("y26F0EmpScGLq2MowX7fhd_QJQ3ydy5cY7YIBi87w93IKLEdfnbJtoOPLU") catch {};
sb_jwk.append("W0ITrJReOgo1cq9SbsxYawBgfp_gh6A5603k2-ZQwVK0JKSHuLFkuQ3U\"") catch {};
sb_jwk.append("}") catch {};
const rsa_key = try chilkat.PrivateKey.init();
defer rsa_key.deinit();
// Note: This example loads the RSA key from JWK format. Any format can be loaded
// into the private key object. (See the online reference documentation..)
rsa_key.loadJwk(try sb_jwk.getAsString(alloc)) catch {
std.debug.print("{s}\n", .{try rsa_key.getLastErrorText(alloc)});
return;
};
// Create the JWS Protected Header
const jws_prot_hdr = try chilkat.JsonObject.init();
defer jws_prot_hdr.deinit();
jws_prot_hdr.appendString("alg", "PS256") catch {};
const jws = try chilkat.Jws.init();
defer jws.deinit();
// Set the protected header:
var signature_index: i32 = 0;
jws.setProtectedHeader(signature_index, jws_prot_hdr) catch {};
// Set the RSA key:
jws.setPrivateKey(signature_index, rsa_key) catch {};
// Set the payload.
const b_include_bom = false;
const payload_str = "In our village, folks say God crumbles up the old moon into stars.";
jws.setPayload(payload_str, "utf-8", b_include_bom) catch {};
// Create the JWS
// By default, the compact serialization is used.
const jws_compact = jws.createJws(alloc) catch {
std.debug.print("{s}\n", .{try jws.getLastErrorText(alloc)});
return;
};
std.debug.print("JWS: {s}\n", .{jws_compact});
// Note: RSA PSS padding uses random values, so the output will be different each time a signature is produced.
// sample output:
// JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ
// Now load the JWS, validate, and recover the original text.
const jws2 = try chilkat.Jws.init();
defer jws2.deinit();
// Load the JWS.
try jws2.loadJws(jws_compact);
const rsa_pub_key = try chilkat.PublicKey.init();
defer rsa_pub_key.deinit();
rsa_key.toPublicKey(rsa_pub_key) catch {};
// Set the RSA public key used for validation.
signature_index = 0;
jws2.setPublicKey(signature_index, rsa_pub_key) catch {};
// Validate the 1st (and only) signature at index 0..
const v = jws2.validate(signature_index);
if (v < 0) {
// Perhaps Chilkat was not unlocked or the trial expired..
std.debug.print("Method call failed for some other reason.\n", .{});
std.debug.print("{s}\n", .{try jws2.getLastErrorText(alloc)});
return;
}
if (v == 0) {
std.debug.print("Invalid signature. The RSA key was incorrect, the JWS was invalid, or both.\n", .{});
return;
}
// If we get here, the signature was validated..
std.debug.print("Signature validated.\n", .{});
// Recover the original content:
std.debug.print("{s}\n", .{try jws2.getPayload(alloc, "utf-8")});
// Examine the protected header:
const jose_header = try chilkat.JsonObject.init();
defer jose_header.deinit();
jws2.getProtectedH(signature_index, jose_header) catch {};
jose_header.setEmitCompact(false);
std.debug.print("Protected (JOSE) header:\n", .{});
std.debug.print("{s}\n", .{try jose_header.emit(alloc)});
// Output:
// Signature validated.
// In our village, folks say God crumbles up the old moon into stars.
// Protected (JOSE) header:
// {
// "alg": "PS256"
// }
}