文件名称：java licence生成例子
文件大小：3KB
文件格式：TXT
更新时间：2015-12-21 05:49:15
java license
java中使用公钥加密私钥解密原理. KeyGenerater类： public class KeyGenerater { private byte[] priKey; private byte[] pubKey; public void generater() { try { KeyPairGenerator keygen = KeyPairGenerator .getInstance("RSA"); SecureRandom secrand = new SecureRandom(); secrand.setSeed("www.川江号子.cn".getBytes()); // 初始化随机产生器 keygen.initialize(1024, secrand); KeyPair keys = keygen.genKeyPair(); PublicKey pubkey = keys.getPublic(); PrivateKey prikey = keys.getPrivate() pubKey = Base64.encodeToByte(pubkey.getEncoded()); priKey = Base64.encodeToByte(prikey.getEncoded()); System.out.println("pubKey = " + new String(pubKey)); System.out.println("priKey = " + new String(priKey)); } catch (java.lang.Exception e) { System.out.println("生成密钥对失败"); e.printStackTrace(); } } public byte[] getPriKey() { return priKey; } public byte[] getPubKey() { return pubKey; } } Signaturer 类： public class Signaturer { public static byte[] sign(byte[] priKeyText, String plainText) { try { PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(Base64.decode(priKeyText)); KeyFactory keyf = KeyFactory.getInstance("RSA"); PrivateKey prikey = keyf.generatePrivate(priPKCS8); // 用私钥对信息生成数字签名 Signature signet = java.security.Signature.getInstance("MD5withRSA"); signet.initSign(prikey); signet.update(plainText.getBytes()); byte[] signed = Base64.encodeToByte(signet.sign()); return signed; catch (java.lang.Exception e) { System.out.println("签名失败"); e.printStackTrace(); } return null; } } SignProvider 类： public class SignProvider { private SignProvider() { } public static boolean verify(byte[] pubKeyText, String plainText, byte[] signText) { try { // 解密由base64编码的公钥,并构造X509EncodedKeySpec对象 X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(Base64.decode(pubKeyText)); // RSA对称加密算法 KeyFactory keyFactory = KeyFactory.getInstance("RSA"); // 取公钥匙对象 PublicKey pubKey = keyFactory.generatePublic(bobPubKeySpec); // 解密由base64编码的数字签名 byte[] signed = Base64.decode(signText); Signature signatureChecker = Signature.getInstance("MD5withRSA"); signatureChecker.initVerify(pubKey); signatureChecker.update(plainText.getBytes()) // 验证签名是否正常 if (signatureChecker.verify(signed))return true; return false; } catch (Throwable e) { System.out.println("校验签名失败"); e.printStackTrace(); return false; } } }