Method es256Sign

java/lib/src/main/java/io/github/ccxt/base/Crypto.java:378–388

(String token, String pem)

    // ====================================================

    static byte[] es256Sign(String token, String pem) {
        try {
            PrivateKey key = ecP256PrivateKeyFromPem(pem);
            Signature sig = Signature.getInstance("SHA256withECDSAinP1363Format");
            sig.initSign(key);
            sig.update(token.getBytes(StandardCharsets.US_ASCII));
            return sig.sign();
        } catch (Exception e) {
            throw new RuntimeException("ES256 signing failed: " + e.getMessage(), e);
        }
    }

    private static PrivateKey ecP256PrivateKeyFromPem(String pem) throws Exception {
        if (pem == null) throw new IllegalArgumentException("pem is null");