package com.oying.utils;
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import org.apache.commons.codec.binary.Base64;
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import javax.crypto.Cipher;
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import java.io.ByteArrayOutputStream;
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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.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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/**
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* @author Z
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* @description Rsa 工具类，公钥私钥生成，加解密
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* @date 2020-05-18
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**/
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public class RsaUtils {
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private static final String SRC = "123456";
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public static void main(String[] args) throws Exception {
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System.out.println("\n");
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RsaKeyPair keyPair = generateKeyPair();
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System.out.println("公钥：" + keyPair.getPublicKey());
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System.out.println("私钥：" + keyPair.getPrivateKey());
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System.out.println("\n");
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test1(keyPair);
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System.out.println("\n");
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test2(keyPair);
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System.out.println("\n");
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}
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/**
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* 公钥加密私钥解密
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*/
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private static void test1(RsaKeyPair keyPair) throws Exception {
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System.out.println("***************** 公钥加密私钥解密开始 *****************");
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String text1 = encryptByPublicKey(keyPair.getPublicKey(), RsaUtils.SRC);
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String text2 = decryptByPrivateKey(keyPair.getPrivateKey(), text1);
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System.out.println("加密前：" + RsaUtils.SRC);
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System.out.println("加密后：" + text1);
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System.out.println("解密后：" + text2);
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if (RsaUtils.SRC.equals(text2)) {
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System.out.println("解密字符串和原始字符串一致，解密成功");
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} else {
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System.out.println("解密字符串和原始字符串不一致，解密失败");
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}
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System.out.println("***************** 公钥加密私钥解密结束 *****************");
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}
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/**
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* 私钥加密公钥解密
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* @throws Exception /
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*/
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private static void test2(RsaKeyPair keyPair) throws Exception {
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System.out.println("***************** 私钥加密公钥解密开始 *****************");
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String text1 = encryptByPrivateKey(keyPair.getPrivateKey(), RsaUtils.SRC);
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String text2 = decryptByPublicKey(keyPair.getPublicKey(), text1);
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System.out.println("加密前：" + RsaUtils.SRC);
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System.out.println("加密后：" + text1);
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System.out.println("解密后：" + text2);
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if (RsaUtils.SRC.equals(text2)) {
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System.out.println("解密字符串和原始字符串一致，解密成功");
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} else {
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System.out.println("解密字符串和原始字符串不一致，解密失败");
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}
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System.out.println("***************** 私钥加密公钥解密结束 *****************");
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}
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/**
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* 公钥解密
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*
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* @param publicKeyText 公钥
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* @param text 待解密的信息
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* @return /
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* @throws Exception /
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*/
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public static String decryptByPublicKey(String publicKeyText, String text) throws Exception {
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X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.DECRYPT_MODE, publicKey);
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byte[] result = doLongerCipherFinal(Cipher.DECRYPT_MODE, cipher, Base64.decodeBase64(text));
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return new String(result);
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}
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/**
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* 私钥加密
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*
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* @param privateKeyText 私钥
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* @param text 待加密的信息
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* @return /
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* @throws Exception /
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*/
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public static String encryptByPrivateKey(String privateKeyText, String text) throws Exception {
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PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.ENCRYPT_MODE, privateKey);
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byte[] result = doLongerCipherFinal(Cipher.ENCRYPT_MODE, cipher, text.getBytes());
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return Base64.encodeBase64String(result);
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}
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/**
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* 私钥解密
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*
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* @param privateKeyText 私钥
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* @param text 待解密的文本
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* @return /
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* @throws Exception /
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*/
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public static String decryptByPrivateKey(String privateKeyText, String text) throws Exception {
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PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText));
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.DECRYPT_MODE, privateKey);
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byte[] result = doLongerCipherFinal(Cipher.DECRYPT_MODE, cipher, Base64.decodeBase64(text));
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return new String(result);
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}
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/**
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* 公钥加密
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*
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* @param publicKeyText 公钥
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* @param text 待加密的文本
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* @return /
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*/
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public static String encryptByPublicKey(String publicKeyText, String text) throws Exception {
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X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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byte[] result = doLongerCipherFinal(Cipher.ENCRYPT_MODE, cipher, text.getBytes());
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return Base64.encodeBase64String(result);
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}
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private static byte[] doLongerCipherFinal(int opMode,Cipher cipher, byte[] source) throws Exception {
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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if (opMode == Cipher.DECRYPT_MODE) {
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out.write(cipher.doFinal(source));
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} else {
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int offset = 0;
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int totalSize = source.length;
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while (totalSize - offset > 0) {
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int size = Math.min(cipher.getOutputSize(0) - 11, totalSize - offset);
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out.write(cipher.doFinal(source, offset, size));
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offset += size;
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}
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}
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out.close();
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return out.toByteArray();
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}
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/**
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* 构建RSA密钥对
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*
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* @return /
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* @throws NoSuchAlgorithmException /
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*/
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public static RsaKeyPair generateKeyPair() throws NoSuchAlgorithmException {
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KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
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keyPairGenerator.initialize(1024);
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KeyPair keyPair = keyPairGenerator.generateKeyPair();
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RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
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RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
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String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
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String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
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return new RsaKeyPair(publicKeyString, privateKeyString);
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}
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/**
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* RSA密钥对对象
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*/
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public static class RsaKeyPair {
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private final String publicKey;
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private final String privateKey;
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public RsaKeyPair(String publicKey, String privateKey) {
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this.publicKey = publicKey;
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this.privateKey = privateKey;
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}
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public String getPublicKey() {
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return publicKey;
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}
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public String getPrivateKey() {
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return privateKey;
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}
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}
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}
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