Rust Requires Chilkat v11.0.0+

Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) that uses RSASSA-PKCS1-v1_5 SHA-256. Rust

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example takes a JSON signature in compact serialization format,
// and uses an RSA public key to validate and recover the protected header and payload.

// We only need a public key for signature validation.  This is the RSA public key
// that is used:

//      {"kty":"RSA", 
//       "n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx
//            HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs
//            D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH
//            SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV
//            MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8
//            NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ", 
//       "e":"AQAB"
//      }

let sb_pub_key = chilkat::StringBuilder::new();
let _ = sb_pub_key.append("{\"kty\":\"RSA\",");
let _ = sb_pub_key.append("\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx");
let _ = sb_pub_key.append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs");
let _ = sb_pub_key.append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH");
let _ = sb_pub_key.append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV");
let _ = sb_pub_key.append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8");
let _ = sb_pub_key.append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",");
let _ = sb_pub_key.append("\"e\":\"AQAB\"");
let _ = sb_pub_key.append("}");

let pub_key = chilkat::PublicKey::new();
if pub_key.load_from_string(&sb_pub_key.get_as_string().unwrap_or_default()).is_err() {
    println!("{}", pub_key.last_error_text());
    return;
}

let jws = chilkat::Jws::new();

// Set the RSA public key:
let signature_index = 0;
let _ = jws.set_public_key(signature_index, &pub_key);

// Load the JWS.
let sb_jws = chilkat::StringBuilder::new();
let _ = sb_jws.append("eyJhbGciOiJSUzI1NiJ9");
let _ = sb_jws.append(".");
let _ = sb_jws.append("eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt");
let _ = sb_jws.append("cGxlLmNvbS9pc19yb290Ijp0cnVlfQ");
let _ = sb_jws.append(".");
let _ = sb_jws.append("cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZmh7");
let _ = sb_jws.append("AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjbKBYNX4");
let _ = sb_jws.append("BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHlb1L07Qe7K");
let _ = sb_jws.append("0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZESc6BfI7noOPqv");
let _ = sb_jws.append("hJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AXLIhWkWywlVmtVrB");
let _ = sb_jws.append("p0igcN_IoypGlUPQGe77Rw");

if jws.load_jws_sb(&sb_jws).is_err() {
    println!("{}", jws.last_error_text());
    return;
}

// Validate the 1st (and only) signature at index 0..
let v = jws.validate(signature_index);
if v < 0 {
    // Perhaps Chilkat was not unlocked or the trial expired..
    println!("Method call failed for some other reason.");
    println!("{}", jws.last_error_text());
    return;
}

if v == 0 {
    println!("Invalid signature.  The RSA key was incorrect, the JWS was invalid, or both.");
    return;
}

// If we get here, the signature was validated..
println!("Signature validated.");
println!("--");

// Recover the original content:
println!("Recovered content:");
println!("{}", jws.get_payload("utf-8").unwrap_or_default());
println!("--");

// Examine the protected header:

let jose_header = chilkat::JsonObject::new();
if jws.get_protected_h(signature_index, &jose_header).is_err() {
    println!("{}", jws.last_error_text());
    return;
}

jose_header.set_emit_compact(false);

println!("Protected (JOSE) header:");
println!("{}", jose_header.emit().unwrap_or_default());

// Output:

// 	Signature validated.
// 	--
// 	Recovered content:
// 	{"iss":"joe", 
// 	 "exp":1300819380,
// 	 "http://example.com/is_root":true}
// 	--
// 	Protected (JOSE) header:
// 	{ 
// 	  "alg": "RS256"
// 	}