Java加密技术(六) - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-23
encryptBASE64(signature.sign()); } /** * 丕刮方忖禰兆 * * @param data * 紗畜方象 * @param publicKey * 巷埒 * @param sign * 方忖禰兆 * * @return 丕刮撹孔卦指true 払移卦指false * @throws Exception * */ public static boolean verify(byte[] data, String publicKey, String sign) throws Exception { // 盾畜喇base64園鷹議巷埒 byte[] keyBytes = decryptBASE64(publicKey); // 更夛X509EncodedKeySpec斤? X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); // ALGORITHM 峺協議紗畜麻隈 KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM); // 函巷埒革斤? PublicKey pubKey = keyFactory.generatePublic(keySpec); Signature signature = Signature.getInstance(keyFactory.getAlgorithm()); signature.initVerify(pubKey); signature.update(data); // 刮屬禰兆頁倦屎械 return signature.verify(decryptBASE64(sign)); } /** * 伏撹畜埒 * * @param seed * 嶽徨 * @return 畜埒斤? * @throws Exception */ public static Map<String, Object> initKey(String seed) throws Exception { KeyPairGenerator keygen = KeyPairGenerator.getInstance(ALGORITHM); // 兜兵晒昧字恢伏匂 SecureRandom secureRandom = new SecureRandom(); secureRandom.setSeed(seed.getBytes()); keygen.initialize(KEY_SIZE, secureRandom); KeyPair keys = keygen.genKeyPair(); DSAPublicKey publicKey = (DSAPublicKey) keys.getPublic(); DSAPrivateKey privateKey = (DSAPrivateKey) keys.getPrivate(); Map<String, Object> map = new HashMap<String, Object>(2); map.put(PUBLIC_KEY, publicKey); map.put(PRIVATE_KEY, privateKey); return map; } /** * 潮範伏撹畜埒 * * @return 畜埒斤? * @throws Exception */ public static Map<String, Object> initKey() throws Exception { return initKey(DEFAULT_SEED); } /** * 函誼暴埒 * * @param keyMap * @return * @throws Exception */ public static String getPrivateKey(Map<String, Object> keyMap) throws Exception { Key key = (Key) keyMap.get(PRIVATE_KEY); return encryptBASE64(key.getEncoded()); } /** * 函誼巷埒 * |
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