The Java Developers Almanac 1.4

e203. Creating a Signature

    // Returns the signature for the given buffer of bytes using the private key.
    public static byte[] createSignature(PrivateKey key, byte[] buffer) {
        try {
            Signature sig = Signature.getInstance(key.getAlgorithm());
            sig.initSign(key);
            sig.update(buffer, 0, buffer.length);
            return sig.sign();
        } catch (SignatureException e) {
        } catch (InvalidKeyException e) {
        } catch (NoSuchAlgorithmException e) {
        }
        return null;
    }

Related Examples

e202. Listing All Available Signature Algorithms
e204. Verifying a Signature
e205. Signing a Java Object

See also: Key Store    Message Digests    Permissions    Policy Files    Public and Private Keys

© 2002 Addison-Wesley.