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@@ -0,0 +1,465 @@
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+package com.fdkankan.ucenter.common;
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+
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+import org.apache.commons.codec.binary.Base64;
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+import org.springframework.util.ResourceUtils;
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+import sun.misc.BASE64Decoder;
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+
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+import javax.crypto.BadPaddingException;
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+import javax.crypto.Cipher;
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+import javax.crypto.IllegalBlockSizeException;
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+import javax.crypto.NoSuchPaddingException;
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+import java.io.*;
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+import java.security.*;
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+import java.security.interfaces.RSAPrivateKey;
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+import java.security.interfaces.RSAPublicKey;
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+import java.security.spec.InvalidKeySpecException;
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+import java.security.spec.PKCS8EncodedKeySpec;
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+import java.security.spec.X509EncodedKeySpec;
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+
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+
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+public class RSAEncrypt {
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+
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+ /**
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+ * 字节数据转字符串专用集合
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+ */
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+ private static final char[] HEX_CHAR = {'0', '1', '2', '3', '4', '5', '6',
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+ '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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+
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+ private static final String PRIVATE_KEY = "classpath:key/private_pkcs8.pem";
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+
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+ private static final String PUBLIC_KEY = "classpath:key/public.pem";
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+ /**
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+ * RSA最大解密密文大小
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+ */
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+ private static final int MAX_DECRYPT_BLOCK = 128;
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+ /**
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+ * 随机生成密钥对
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+ */
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+ public static void genKeyPair(String filePath) {
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+ // KeyPairGenerator类用于生成公钥和私钥对,基于RSA算法生成对象
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+ KeyPairGenerator keyPairGen = null;
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+ try {
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+ keyPairGen = KeyPairGenerator.getInstance("RSA");
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+ } catch (NoSuchAlgorithmException e) {
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+ e.printStackTrace();
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+ }
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+ // 初始化密钥对生成器,密钥大小为96-1024位
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+ keyPairGen.initialize(1024, new SecureRandom());
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+ // 生成一个密钥对,保存在keyPair中
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+ KeyPair keyPair = keyPairGen.generateKeyPair();
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+ // 得到私钥
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+ RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
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+ // 得到公钥
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+ RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
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+ try {
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+ // 得到公钥字符串
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+ Base64 base64 = new Base64();
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+ String publicKeyString = new String(base64.encode(publicKey.getEncoded()));
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+ // 得到私钥字符串
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+ String privateKeyString = new String(base64.encode(privateKey.getEncoded()));
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+ // 将密钥对写入到文件
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+ FileWriter pubfw = new FileWriter(filePath + PUBLIC_KEY);
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+ FileWriter prifw = new FileWriter(filePath + PRIVATE_KEY);
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+ BufferedWriter pubbw = new BufferedWriter(pubfw);
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+ BufferedWriter pribw = new BufferedWriter(prifw);
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+ pubbw.write(publicKeyString);
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+ pribw.write(privateKeyString);
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+ pubbw.flush();
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+ pubbw.close();
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+ pubfw.close();
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+ pribw.flush();
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+ pribw.close();
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+ prifw.close();
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+ } catch (Exception e) {
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+ e.printStackTrace();
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+ }
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+ }
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+
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+ /**
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+ * 从文件中输入流中加载公钥
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+ *
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+ * @throws Exception 加载公钥时产生的异常
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+ */
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+ public static String loadPublicKeyByFile() throws Exception {
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+ try {
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+ BufferedReader br = new BufferedReader(new FileReader(ResourceUtils.getFile(PUBLIC_KEY)));
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+ String readLine = null;
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+ StringBuilder sb = new StringBuilder();
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+ while ((readLine = br.readLine()) != null) {
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+ if (readLine.charAt(0) == '-') {
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+ continue;
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+ } else {
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+ sb.append(readLine);
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+ sb.append('\r');
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+ }
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+ }
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+ br.close();
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+ return sb.toString();
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+ } catch (IOException e) {
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+ throw new Exception("公钥数据流读取错误");
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+ } catch (NullPointerException e) {
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+ throw new Exception("公钥输入流为空");
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+ }
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+ }
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+
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+ /**
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+ * 从文件中输入流中加载公钥
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+ *
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+ * @throws Exception 加载公钥时产生的异常
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+ */
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+ public static String loadPublicKeyByFile(String publicKy) throws Exception {
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+ try {
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+ BufferedReader br = new BufferedReader(new FileReader(new File(publicKy)));
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+ String readLine = null;
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+ StringBuilder sb = new StringBuilder();
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+ while ((readLine = br.readLine()) != null) {
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+ if (readLine.charAt(0) == '-') {
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+ continue;
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+ } else {
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+ sb.append(readLine);
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+ sb.append('\r');
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+ }
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+ }
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+ br.close();
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+ return sb.toString();
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+ } catch (IOException e) {
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+ throw new Exception("公钥数据流读取错误");
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+ } catch (NullPointerException e) {
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+ throw new Exception("公钥输入流为空");
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+ }
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+ }
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+
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+ /**
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+ * 从字符串中加载公钥
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+ *
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+ * @param publicKeyStr 公钥数据字符串
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+ * @throws Exception 加载公钥时产生的异常
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+ */
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+ public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr)
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+ throws Exception {
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+ try {
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+ BASE64Decoder base64 = new BASE64Decoder();
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+ byte[] buffer = base64.decodeBuffer(publicKeyStr);
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+ KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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+ X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
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+ return (RSAPublicKey) keyFactory.generatePublic(keySpec);
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+ } catch (NoSuchAlgorithmException e) {
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+ throw new Exception("无此算法");
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+ } catch (InvalidKeySpecException e) {
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+ throw new Exception("公钥非法");
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+ } catch (NullPointerException e) {
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+ throw new Exception("公钥数据为空");
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+ }
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+ }
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+
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+ /**
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+ * 从文件中加载私钥
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+ *
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+ * @return 是否成功
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+ * @throws Exception
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+ */
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+ public static String loadPrivateKeyByFile() throws Exception {
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+ try {
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+ InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("key/private_pkcs8.pem");
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+ StringBuilder builder = new StringBuilder();
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+ InputStreamReader reader = new InputStreamReader(inputStream , "UTF-8" );
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+ BufferedReader bfReader = new BufferedReader( reader );
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+ String tmpContent = null;
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+ while ((tmpContent = bfReader.readLine()) != null) {
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+ if (tmpContent.charAt(0) == '-') {
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+ continue;
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+ } else {
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+ builder.append(tmpContent);
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+ builder.append('\r');
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+ }
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+ }
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+ bfReader.close();
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+ return builder.toString();
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+// BufferedReader br = new BufferedReader(new FileReader(ResourceUtils.getFile(PRIVATE_KEY)));
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+// String readLine = null;
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+// StringBuilder sb = new StringBuilder();
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+// while ((readLine = br.readLine()) != null) {
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+// if (readLine.charAt(0) == '-') {
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+// continue;
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+// } else {
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+// sb.append(readLine);
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+// sb.append('\r');
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+// }
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+// }
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+// br.close();
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+// return sb.toString();
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+ } catch (IOException e) {
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+ throw new Exception("私钥数据读取错误");
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+ } catch (NullPointerException e) {
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+ throw new Exception("私钥输入流为空");
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+ }
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+ }
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+
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+ /**
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+ * 从文件中加载私钥
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+ *
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+ * @return 是否成功
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+ * @throws Exception
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+ */
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+ public static String loadPrivateKeyByFile(String filePath) throws Exception {
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+ try {
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+ InputStream inputStream = new FileInputStream(filePath);
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+ StringBuilder builder = new StringBuilder();
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+ InputStreamReader reader = new InputStreamReader(inputStream , "UTF-8" );
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+ BufferedReader bfReader = new BufferedReader( reader );
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+ String tmpContent = null;
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+ while ((tmpContent = bfReader.readLine()) != null) {
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+ if (tmpContent.charAt(0) == '-') {
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+ continue;
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+ } else {
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+ builder.append(tmpContent);
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+ builder.append('\r');
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+ }
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+ }
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+ bfReader.close();
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+ return builder.toString();
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+// BufferedReader br = new BufferedReader(new FileReader(ResourceUtils.getFile(PRIVATE_KEY)));
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+// String readLine = null;
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+// StringBuilder sb = new StringBuilder();
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+// while ((readLine = br.readLine()) != null) {
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+// if (readLine.charAt(0) == '-') {
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+// continue;
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+// } else {
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+// sb.append(readLine);
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+// sb.append('\r');
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+// }
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+// }
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+// br.close();
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+// return sb.toString();
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+ } catch (IOException e) {
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+ throw new Exception("私钥数据读取错误");
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+ } catch (NullPointerException e) {
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+ throw new Exception("私钥输入流为空");
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+ }
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+ }
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+
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+ public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr)
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+ throws Exception {
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+ try {
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+ BASE64Decoder base64Decoder = new BASE64Decoder();
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+ byte[] buffer = base64Decoder.decodeBuffer(privateKeyStr);
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+ PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
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+ KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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+ return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
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+ } catch (NoSuchAlgorithmException e) {
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+ throw new Exception("无此算法");
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+ } catch (InvalidKeySpecException e) {
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+ throw new Exception("私钥非法");
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+ } catch (NullPointerException e) {
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+ throw new Exception("私钥数据为空");
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+ }
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+ }
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+
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+ /**
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+ * 公钥加密过程
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+ *
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+ * @param publicKey 公钥
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+ * @param plainTextData 明文数据
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+ * @return
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+ * @throws Exception 加密过程中的异常信息
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+ */
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+ public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData)
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+ throws Exception {
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+ if (publicKey == null) {
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+ throw new Exception("加密公钥为空, 请设置");
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+ }
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+ Cipher cipher = null;
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+ try {
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+ // 使用默认RSA
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+ cipher = Cipher.getInstance("RSA");
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+ // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
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+ cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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+ byte[] output = cipher.doFinal(plainTextData);
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+ return output;
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+ } catch (NoSuchAlgorithmException e) {
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+ throw new Exception("无此加密算法");
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+ } catch (NoSuchPaddingException e) {
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+ e.printStackTrace();
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+ return null;
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+ } catch (InvalidKeyException e) {
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+ throw new Exception("加密公钥非法,请检查");
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+ } catch (IllegalBlockSizeException e) {
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+ throw new Exception("明文长度非法");
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+ } catch (BadPaddingException e) {
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+ throw new Exception("明文数据已损坏");
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+ }
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+ }
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+
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+ /**
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+ * 私钥加密过程
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+ *
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+ * @param privateKey 私钥
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+ * @param plainTextData 明文数据
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+ * @return
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+ * @throws Exception 加密过程中的异常信息
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+ */
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+ public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData)
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+ throws Exception {
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+ if (privateKey == null) {
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+ throw new Exception("加密私钥为空, 请设置");
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+ }
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+ Cipher cipher = null;
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+ try {
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+ // 使用默认RSA
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+ cipher = Cipher.getInstance("RSA");
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+ cipher.init(Cipher.ENCRYPT_MODE, privateKey);
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+ byte[] output = cipher.doFinal(plainTextData);
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+ return output;
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+ } catch (NoSuchAlgorithmException e) {
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+ throw new Exception("无此加密算法");
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+ } catch (NoSuchPaddingException e) {
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+ e.printStackTrace();
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+ return null;
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+ } catch (InvalidKeyException e) {
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+ throw new Exception("加密私钥非法,请检查");
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+ } catch (IllegalBlockSizeException e) {
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+ throw new Exception("明文长度非法");
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+ } catch (BadPaddingException e) {
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+ throw new Exception("明文数据已损坏");
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+ }
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+ }
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+
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+ /**
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+ * 私钥解密过程
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+ *
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+ * @param privateKey 私钥
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+ * @param cipherData 密文数据
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+ * @return 明文
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+ * @throws Exception 解密过程中的异常信息
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+ */
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+ public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData)
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+ throws Exception {
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+ if (privateKey == null) {
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+ throw new Exception("解密私钥为空, 请设置");
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+ }
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+ Cipher cipher = null;
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+ try {
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+ // 使用默认RSA
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+ cipher = Cipher.getInstance("RSA");
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+// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
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+ cipher.init(Cipher.DECRYPT_MODE, privateKey);
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+ /*byte[] output = cipher.doFinal(cipherData);
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+ return output;*/
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+ return getDecrytedData(cipherData, cipher);
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+ } catch (NoSuchAlgorithmException e) {
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+ throw new Exception("无此解密算法");
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+ } catch (NoSuchPaddingException e) {
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+ e.printStackTrace();
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+ return null;
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+ } catch (InvalidKeyException e) {
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+ throw new Exception("解密私钥非法,请检查");
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+ } catch (IllegalBlockSizeException e) {
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+ throw new Exception("密文长度非法");
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+ } catch (BadPaddingException e) {
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+ throw new Exception("密文数据已损坏");
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+ }
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+ }
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+
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+ /**
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+ * 公钥解密过程
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+ *
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+ * @param publicKey 公钥
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+ * @param cipherData 密文数据
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+ * @return 明文
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+ * @throws Exception 解密过程中的异常信息
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+ */
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+ public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData)
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+ throws Exception {
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+ if (publicKey == null) {
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+ throw new Exception("解密公钥为空, 请设置");
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+ }
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+ Cipher cipher = null;
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+ try {
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+ // 使用默认RSA
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+ cipher = Cipher.getInstance("RSA");
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+ // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
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+ cipher.init(Cipher.DECRYPT_MODE, publicKey);
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+ /*byte[] output = cipher.doFinal(cipherData);
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+ return output;*/
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+ return getDecrytedData(cipherData, cipher);
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+ } catch (NoSuchAlgorithmException e) {
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+ throw new Exception("无此解密算法");
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+ } catch (NoSuchPaddingException e) {
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+ e.printStackTrace();
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+ return null;
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+ } catch (InvalidKeyException e) {
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+ throw new Exception("解密公钥非法,请检查");
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+ } catch (IllegalBlockSizeException e) {
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+ throw new Exception("密文长度非法");
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+ } catch (BadPaddingException e) {
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+ throw new Exception("密文数据已损坏");
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+ }
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+ }
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+
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+ private static byte[] getDecrytedData(byte[] cipherData, Cipher cipher) throws IllegalBlockSizeException, BadPaddingException, IOException {
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+// int inputLen = cipherData.length;
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+//// ByteArrayOutputStream out = new ByteArrayOutputStream();
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+//// int offSet = 0;
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+//// byte[] cache;
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+//// int i = 0;
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+//// // 对数据分段解密
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+//// while (inputLen - offSet > 0) {
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+//// if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
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+//// cache = cipher.doFinal(cipherData, offSet, MAX_DECRYPT_BLOCK);
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+//// } else {
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+//// cache = cipher.doFinal(cipherData, offSet, inputLen - offSet);
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+//// }
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+//// out.write(cache, 0, cache.length);
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+//// i++;
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+//// offSet = i * MAX_DECRYPT_BLOCK;
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+//// }
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+//// byte[] decryptedData = out.toByteArray();
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+//// out.close();
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+//// return decryptedData;
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+ int inputLen = cipherData.length;
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+ ByteArrayOutputStream out = new ByteArrayOutputStream();
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+ int offSet = 0;
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+
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+ for(int i = 0; inputLen - offSet > 0; offSet = i * 256) {
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+ byte[] cache;
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+ if(inputLen - offSet > 256) {
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+ cache = cipher.doFinal(cipherData, offSet, 256);
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+ } else {
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+ cache = cipher.doFinal(cipherData, offSet, inputLen - offSet);
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+ }
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+ out.write(cache, 0, cache.length);
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+ ++i;
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+ }
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+
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+ byte[] decryptedData = out.toByteArray();
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+ out.close();
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+ return decryptedData;
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+ }
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+
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+ /**
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+ * 字节数据转十六进制字符串
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+ *
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+ * @param data 输入数据
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+ * @return 十六进制内容
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+ */
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+ public static String byteArrayToString(byte[] data) {
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+ StringBuilder stringBuilder = new StringBuilder();
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+ for (int i = 0; i < data.length; i++) {
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+ // 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移
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+ stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);
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+ // 取出字节的低四位 作为索引得到相应的十六进制标识符
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+ stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);
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+ if (i < data.length - 1) {
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+ stringBuilder.append(' ');
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+ }
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+ }
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+ return stringBuilder.toString();
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+ }
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+
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+ public static void main(String[] args) throws Exception {
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+
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+
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+
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+ }
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+
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+}
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