Function signMessage

vmm/src/x25519.js:1546–1563

* Signs the given message using the private key and returns a signed message (signature concatenated with the message copy). * * Optional random data argument (which must have 64 random bytes) turns on hash separation and randomization to make signatures non-deterministic. * * @e

(secretKey, msg, opt_random)

     * @returns
     */
    function signMessage(secretKey, msg, opt_random) {
        checkArrayTypes(msg, secretKey);
        if (secretKey.length !== 32)
            throw new Error('wrong secret key length');
        if (opt_random) {
            checkArrayTypes(opt_random);
            if (opt_random.length !== 64)
                throw new Error('wrong random data length');
            var buf = new Uint8Array(128 + msg.length);
            curve25519_sign(buf, msg, msg.length, secretKey, opt_random);
            return new Uint8Array(buf.subarray(0, 64 + msg.length));
        }
        else {
            var signedMsg = new Uint8Array(64 + msg.length);
            curve25519_sign(signedMsg, msg, msg.length, secretKey);
            return signedMsg;
        }
    }
    /**
     * Verifies signed message with the public key and returns the original message without signature if it's correct or null if verification fails.
     *