rsa登录密码非对称加密.zip

package com.msunhealth.common.utils.security; import org.apache.commons.codec.binary.Base64; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import java.security.*; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.InvalidKeySpecException; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; public class RSAUtil { public static String publicKey; public static String privateKey; public static void generateKey() { // 1.初始化秘钥 KeyPairGenerator keyPairGenerator; try { keyPairGenerator = KeyPairGenerator.getInstance("RSA"); SecureRandom sr = new SecureRandom(); // 随机数生成器 keyPairGenerator.initialize(512, sr); // 设置512位长的秘钥 KeyPair keyPair = keyPairGenerator.generateKeyPair(); // 开始创建 RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate(); // 进行转码 publicKey = Base64.encodeBase64String(rsaPublicKey.getEncoded()); // 进行转码 privateKey = Base64.encodeBase64String(rsaPrivateKey.getEncoded()); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 公钥加密 * @param str * @param publicKey * @return * @throws Exception */ public static String encrypt(String str, String publicKey) throws Exception { //base64编码的公钥 byte[] decoded = java.util.Base64.getDecoder().decode(publicKey); RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded)); //RSA加密 Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); String outStr = java.util.Base64.getEncoder().encodeToString(cipher.doFinal(str.getBytes("UTF-8"))); return outStr; } /** * 公钥加密 * @param publicKey * @param plainTextData * @return * @throws Exception */ public static String encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception { if (publicKey == null) { throw new Exception("加密公钥为空, 请设置"); } Cipher cipher = null; try { // 使用默认RSA cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] output = cipher.doFinal(plainTextData); return base64ToStr(output); } catch (NoSuchAlgorithmException e) { throw new Exception("无此加密算法"); } catch (NoSuchPaddingException e) { e.printStackTrace(); return null; } catch (InvalidKeyException e) { throw new Exception("加密公钥非法,请检查"); } catch (IllegalBlockSizeException e) { throw new Exception("明文长度非法"); } catch (BadPaddingException e) { throw new Exception("明文数据已损坏"); } } /** * 私钥解密 * @param privateKey * @param cipherData * @return * @throws Exception */ public static String decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception { if (privateKey == null) { throw new Exception("解密私钥为空, 请设置"); } Cipher cipher = null; try { // 使用默认RSA cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] output = cipher.doFinal(cipherData); return new String(output); } catch (NoSuchAlgorithmException e) { throw new Exception("无此解密算法"); } catch (NoSuchPaddingException e) { e.printStackTrace(); return null; } catch (InvalidKeyException e) { throw new Exception("解密私钥非法,请检查"); } catch (IllegalBlockSizeException e) { e.printStackTrace(); throw new Exception("密文长度非法"); } catch (BadPaddingException e) { e.printStackTrace(); throw new Exception("密文数据已损坏"); } } public static String base64ToStr(byte[] b) { return javax.xml.bind.DatatypeConverter.printBase64Binary(b); } public static byte[] strToBase64(String str) { return javax.xml.bind.DatatypeConverter.parseBase64Binary(str); } /** * 根据公钥字符串加载公钥 * @param publicKeyStr * @return * @throws Exception */ public static RSAPublicKey loadPublicKey(String publicKeyStr) throws Exception { try { byte[] buffer = javax.xml.bind.DatatypeConverter.parseBase64Binary(publicKeyStr); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer); return (RSAPublicKey) keyFactory.generatePublic(keySpec); } catch (NoSuchAlgorithmException e) { throw new Exception("无此算法", e); } catch (InvalidKeySpecException e) { throw new Exception("公钥非法", e); } catch (NullPointerException e) { throw new Exception("公钥数据为空", e); } } /** * 根据私钥字符串加载私钥 * @param privateKeyStr * @return * @throws Exception */ public static RSAPrivateKey loadPrivateKey(String privateKeyStr) throws Exception { try { byte[] buffer = javax.xml.bind.DatatypeConverter.parseBase64Binary(privateKeyStr); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); return (RSAPrivateKey) keyFactory.generatePrivate(keySpec); } catch (NoSuchAlgorithmException e) { throw new Exception("无此算法", e); } catch (InvalidKeySpecException e) { throw new Exception("私钥非法", e); } catch (NullPointerException e) { throw new Exception("私钥数据为空", e); } } public static void main(String[] args) throws Exception { // 1.生成公钥和私钥密钥对 //MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALIMtsgAshbhZBatWJBjE2JG33YW/OgDWn18QvgPJRDjMGF7lDyLqgtvJ40kMGR8J1eGcQSv+HiK3MAalSyAKcsCAwEAAQ== RSAUtil.generateKey(); System.out.println("私钥:" + RSAUtil.privateKey); System.out.println("公钥:" + RSAUtil.publicKey); String content = "{\"loginName\":\"test\",\"secret\":\"123456\"}"; System.out.println("加密前:"+content); String encryptData=RSAUtil.encrypt(loadPublicKey(RSAUtil.publicKey),content.getBytes()); System.out.println("加密后："+encryptData); String decryptData=RSAUtil.decrypt(RSAUtil.loadPrivateKey(RSAUtil.privateKey),RSAUtil.strToBase64(encryptData)); System.out.println("解密后："+decryptData); } }