[Java教程]java RSA 生成公钥私钥

0 2016-10-14 17:00:15 /** * 引进的包都是Java自带的jar包 * 秘钥相关包 * base64 编解码 * 这里只用到了编码 */import java.security.Key;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.util.HashMap;import java.util.Map;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;public class CreateSecrteKey { public class Keys { } public static final String KEY_ALGORITHM = "RSA"; //public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; private static final String PUBLIC_KEY = "RSAPublicKey"; private static final String PRIVATE_KEY = "RSAPrivateKey"; //获得公钥 public static String getPublicKey(Map keyMap) throws Exception { //获得map中的公钥对象 转为key对象 Key key = (Key) keyMap.get(PUBLIC_KEY); //byte[] publicKey = key.getEncoded(); //编码返回字符串 return encryptBASE64(key.getEncoded()); } //获得私钥 public static String getPrivateKey(Map keyMap) throws Exception { //获得map中的私钥对象 转为key对象 Key key = (Key) keyMap.get(PRIVATE_KEY); //byte[] privateKey = key.getEncoded(); //编码返回字符串 return encryptBASE64(key.getEncoded()); } //解码返回byte public static byte[] decryptBASE64(String key) throws Exception { return (new BASE64Decoder()).decodeBuffer(key); } //编码返回字符串 public static String encryptBASE64(byte[] key) throws Exception { return (new BASE64Encoder()).encodeBuffer(key); } //map对象中存放公私钥 public static Map initKey() throws Exception { //获得对象 KeyPairGenerator 参数 RSA 1024个字节 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM); keyPairGen.initialize(1024); //通过对象 KeyPairGenerator 获取对象KeyPair KeyPair keyPair = keyPairGen.generateKeyPair(); //通过对象 KeyPair 获取RSA公私钥对象RSAPublicKey RSAPrivateKey RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); //公私钥对象存入map中 Map keyMap = new HashMap(2); keyMap.put(PUBLIC_KEY, publicKey); keyMap.put(PRIVATE_KEY, privateKey); return keyMap; } public static void main(String[] args) { Map keyMap; try { keyMap = initKey(); String publicKey = getPublicKey(keyMap); System.out.println(publicKey); String privateKey = getPrivateKey(keyMap); System.out.println(privateKey); } catch (Exception e) { e.printStackTrace(); } }

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