license 生成license文件demo

package com.uniware.license; import java.security.Key; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.SecureRandom; import java.security.Signature; import java.security.interfaces.DSAPrivateKey; import java.security.interfaces.DSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import java.util.HashMap; import java.util.Map; /** * DSA安全编码组件 * * @author 梁栋 * @version 1.0 * @since 1.0 */ public abstract class DSACoder extends Coder { public static final String ALGORITHM = "DSA"; /** * 默认密钥字节数 * * <pre> * DSA * Default Keysize 1024 * Keysize must be a multiple of 64, ranging from 512 to 1024 (inclusive). * </pre> */ private static final int KEY_SIZE = 1024; /** * 默认种子 */ private static final String DEFAULT_SEED = "0f22507a10bbddd07d8a3082122966e3"; private static final String PUBLIC_KEY = "DSAPublicKey"; private static final String PRIVATE_KEY = "DSAPrivateKey"; /** * 用私钥对信息生成数字签名 * * @param data * 加密数据 * @param privateKey * 私钥 * * @return * @throws Exception */ public static String sign(byte[] data, String privateKey) throws Exception { // 解密由base64编码的私钥 byte[] keyBytes = decryptBASE64(privateKey); // 构造PKCS8EncodedKeySpec对象 PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); // KEY_ALGORITHM 指定的加密算法 KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM); // 取私钥匙对象 PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec); // 用私钥对信息生成数字签名 Signature signature = Signature.getInstance(keyFactory.getAlgorithm()); signature.initSign(priKey); signature.update(data); return encryptBASE64(signature.sign()); } /** * 校验数字签名 * * @param data * 加密数据 * @param publicKey * 公钥 * @param sign * 数字签名 * * @return 校验成功返回true 失败返回false * @throws Exception * */ public static boolean verify(byte[] data, String publicKey, String sign) throws Exception { // 解密由base64编码的公钥 byte[] keyBytes = decryptBASE64(publicKey); // 构造X509EncodedKeySpec对象 X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); // ALGORITHM 指定的加密算法 KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM); // 取公钥匙对象 PublicKey pubKey = keyFactory.generatePublic(keySpec); Signature signature = Signature.getInstance(keyFactory.getAlgorithm()); signature.initVerify(pubKey); signature.update(data); // 验证签名是否正常 return signature.verify(decryptBASE64(sign)); } /** * 生成密钥 * * @param seed * 种子 * @return 密钥对象 * @throws Exception */ public static Map<String, Object> initKey(String seed) throws Exception { KeyPairGenerator keygen = KeyPairGenerator.getInstance(ALGORITHM); if (null == seed || "".equals(seed.trim())) { seed = DEFAULT_SEED; } // 初始化随机产生器 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); System.out.println("公钥：" + publicKey); System.out.println("私钥：" + privateKey); map.put(PUBLIC_KEY, publicKey); map.put(PRIVATE_KEY, privateKey); return map; } /** * 默认生成密钥 * * @return 密钥对象 * @throws Exception */ public static Map<String, Object> initKey() throws Exception { return initKey(DEFAULT_SEED); } /** * 取得私钥 * * @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()); } /** * 取得公钥 * * @param keyMap * @return * @throws Exception */ public static String getPublicKey(Map<String, Object> keyMap) throws Exception { Key key = (Key) keyMap.get(PUBLIC_KEY); return encryptBASE64(key.getEncoded()); } }