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The Java Developers Almanac 1.4Order this book from Amazon. |
e201. Creating Key Objects from a Set of Digital Signature Algorithm (DSA) ParametersThe DSA requires three parameters to create a key pair - the prime (P), the subprime (Q), and the base (G). These three values are used to create a private key (called X) and a public key (called Y). This example creates a try { // Obtain the DSA parameters; // see e200 Getting the Digital Signature Algorithm (DSA) Parameters of a Key Pair BigInteger p = ...; BigInteger q = ...; BigInteger g = ...; BigInteger x = ...; BigInteger y = ...; // Create the DSA key factory KeyFactory keyFactory = KeyFactory.getInstance("DSA"); // Create the DSA private key KeySpec privateKeySpec = new DSAPrivateKeySpec(x, p, q, g); PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec); // Create the DSA public key KeySpec publicKeySpec = new DSAPublicKeySpec(y, p, q, g); PublicKey publicKey = keyFactory.generatePublic(publicKeySpec); } catch (InvalidKeySpecException e) { } catch (NoSuchAlgorithmException e) { }
e198. Generating a Public/Private Key Pair e199. Getting the Bytes of a Generated Key Pair e200. Getting the Digital Signature Algorithm (DSA) Parameters of a Key Pair
© 2002 Addison-Wesley. |