JAVA--RSA加密

加密用到的JAR包

 <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-io --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-io</artifactId><version>1.3.2</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.directory.studio/org.apache.commons.codec --><dependency><groupId>org.apache.directory.studio</groupId><artifactId>org.apache.commons.codec</artifactId><version>1.8</version></dependency>

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.IOUtils;import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
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;
import java.util.HashMap;
import java.util.Map;public class RSAUtils {public static final String CHARSET = "UTF-8";public static final String RSA_ALGORITHM = "RSA";public static Map<String, String> createKeys(int keySize){//为RSA算法创建一个KeyPairGenerator对象KeyPairGenerator kpg;try{kpg = KeyPairGenerator.getInstance(RSA_ALGORITHM);}catch(NoSuchAlgorithmException e){throw new IllegalArgumentException("No such algorithm-->[" + RSA_ALGORITHM + "]");}//初始化KeyPairGenerator对象,密钥长度kpg.initialize(keySize);//生成密匙对KeyPair keyPair = kpg.generateKeyPair();//得到公钥Key publicKey = keyPair.getPublic();String publicKeyStr = Base64.encodeBase64URLSafeString(publicKey.getEncoded());//得到私钥Key privateKey = keyPair.getPrivate();String privateKeyStr = Base64.encodeBase64URLSafeString(privateKey.getEncoded());Map<String, String> keyPairMap = new HashMap<String, String>();keyPairMap.put("publicKey", publicKeyStr);keyPairMap.put("privateKey", privateKeyStr);return keyPairMap;}/*** 得到公钥* @param publicKey 密钥字符串（经过base64编码）* @throws Exception*/public static RSAPublicKey getPublicKey(String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException {//通过X509编码的Key指令获得公钥对象KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKey));RSAPublicKey key = (RSAPublicKey) keyFactory.generatePublic(x509KeySpec);return key;}/*** 得到私钥* @param privateKey 密钥字符串（经过base64编码）* @throws Exception*/public static RSAPrivateKey getPrivateKey(String privateKey) throws NoSuchAlgorithmException, InvalidKeySpecException {//通过PKCS#8编码的Key指令获得私钥对象KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKey));RSAPrivateKey key = (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);return key;}/*** 公钥加密* @param data* @param publicKey* @return*/public static String publicEncrypt(String data, RSAPublicKey publicKey){try{Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);cipher.init(Cipher.ENCRYPT_MODE, publicKey);return Base64.encodeBase64URLSafeString(rsaSplitCodec(cipher, Cipher.ENCRYPT_MODE, data.getBytes(CHARSET), publicKey.getModulus().bitLength()));}catch(Exception e){throw new RuntimeException("加密字符串[" + data + "]时遇到异常", e);}}/*** 私钥解密* @param data* @param privateKey* @return*/public static String privateDecrypt(String data, RSAPrivateKey privateKey){try{Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);cipher.init(Cipher.DECRYPT_MODE, privateKey);return new String(rsaSplitCodec(cipher, Cipher.DECRYPT_MODE, Base64.decodeBase64(data), privateKey.getModulus().bitLength()), CHARSET);}catch(Exception e){throw new RuntimeException("解密字符串[" + data + "]时遇到异常", e);}}/*** 私钥加密* @param data* @param privateKey* @return*/public static String privateEncrypt(String data, RSAPrivateKey privateKey){try{Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);cipher.init(Cipher.ENCRYPT_MODE, privateKey);return Base64.encodeBase64URLSafeString(rsaSplitCodec(cipher, Cipher.ENCRYPT_MODE, data.getBytes(CHARSET), privateKey.getModulus().bitLength()));}catch(Exception e){throw new RuntimeException("加密字符串[" + data + "]时遇到异常", e);}}/*** 公钥解密* @param data* @param publicKey* @return*/public static String publicDecrypt(String data, RSAPublicKey publicKey){try{Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);cipher.init(Cipher.DECRYPT_MODE, publicKey);return new String(rsaSplitCodec(cipher, Cipher.DECRYPT_MODE, Base64.decodeBase64(data), publicKey.getModulus().bitLength()), CHARSET);}catch(Exception e){throw new RuntimeException("解密字符串[" + data + "]时遇到异常", e);}}private static byte[] rsaSplitCodec(Cipher cipher, int opmode, byte[] datas, int keySize){int maxBlock = 0;if(opmode == Cipher.DECRYPT_MODE){maxBlock = keySize / 8;}else{maxBlock = keySize / 8 - 11;}ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] buff;int i = 0;try{while(datas.length > offSet){if(datas.length-offSet > maxBlock){buff = cipher.doFinal(datas, offSet, maxBlock);}else{buff = cipher.doFinal(datas, offSet, datas.length-offSet);}out.write(buff, 0, buff.length);i++;offSet = i * maxBlock;}}catch(Exception e){throw new RuntimeException("加解密阀值为["+maxBlock+"]的数据时发生异常", e);}byte[] resultDatas = out.toByteArray();IOUtils.closeQuietly(out);return resultDatas;}}

一般公钥和私钥都是配置在properties文件中，所以，提前把公钥私钥准备好

public class Test1 {public static void main (String[] args) throws Exception {Map<String, String> keyMap = RSAUtils.createKeys(1024);
//        String  publicKey = keyMap.get("publicKey");String publicKey="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCIHvSdTGM4SThaSZ9pdsu09wsEyuwRp_w-aSCPajTizykD2DtyxOANaeynYBXibkFtsZ5bujnEwEH5NwqzYdvJUcU-SqriC4wP9uhpdWS7wEAM9kqn9GCT5TN-aqk8RG3X_WwErum-D7obSYm2eqyrGQJsH4WJRU2-IMeUrUUlawIDAQAB";
//        String  privateKey = keyMap.get("privateKey");String  privateKey = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAIge9J1MYzhJOFpJn2l2y7T3CwTK7BGn_D5pII9qNOLPKQPYO3LE4A1p7KdgFeJuQW2xnlu6OcTAQfk3CrNh28lRxT5KquILjA_26Gl1ZLvAQAz2Sqf0YJPlM35qqTxEbdf9bASu6b4PuhtJibZ6rKsZAmwfhYlFTb4gx5StRSVrAgMBAAECgYAmR35G1fp5E64zRcz8nZm_tFF28ZHdjT4UVv__FMD2n4dLO33MUq0nWIhisVS2Lodbz71W0lH4kJB9AwuRUo258KKQp7Rx_PH_LKQgKbB-W4EAyzQKNxDC8JXn0kivNw_EEYPuFc_EErvrRlTvoAbRZNaqO05mK8C30dSPlZA6cQJBAMGvoZ-ZRH3GaYdZNoGrY9nob57QY_LMAltMZijxqu4nwMU6SppzhlqzHQjeyef2NB63-qr_QYfK3B-Ou5oq4DcCQQCz6iUYkL6fFGgyrHDn4VjYJ7dlsJXOJQAy2o9Zr1LjqhX6tyLC9HufzYrZA71qbKjEAZ1noB-mhjHW0sL8tsJtAkEAmKINnjYsUWnQs8bMO3eTIqAXhnH2sdmvab9VKqL37uII-eQr8ndjw4ovMVRQjKnq_OJDegnZ3Gcy_POAR8fOFQJBAIXInc8XivfF9_l-avKyihsp5WEznyHMN8qY5TG-gneSeYeWeL3ZiLf64r2e31Hs_M3LmZ193ys37IWe8alzyT0CQHjp3hCz9EuEn1HcYJrGtm1G7Tduq7RhY8OABhOPTMUL2hkSXKOcvaQk6tbpjR_23HT0rGaFjiRYb1W0RPqXW28";System.out.println("公钥: \n\r" + publicKey);System.out.println("私钥： \n\r" + privateKey);System.out.println("公钥加密——私钥解密");String str = "站在大明门前守卫的禁卫军，事先没有接到\n" +"有关的命令，但看到大批盛装的官员来临，也就\n" +"以为确系举行大典，因而未加询问。进大明门即\n" +"为皇城。文武百官看到端门午门之前气氛平静，\n" +"城楼上下也无朝会的迹象，既无几案，站队点名\n" +"的御史和御前侍卫“大汉将军”也不见踪影，不免\n" +"心中揣测，互相询问：所谓午朝是否讹传？";System.out.println("\r明文：\r\n" + str);System.out.println("\r明文大小：\r\n" + str.getBytes().length);String encodedData = RSAUtils.publicEncrypt(str, RSAUtils.getPublicKey(publicKey));System.out.println("密文：\r\n" + encodedData);String decodedData = RSAUtils.privateDecrypt(encodedData, RSAUtils.getPrivateKey(privateKey));System.out.println("解密后文字: \r\n" + decodedData);}
}

原文：https://blog.csdn.net/cz0217/article/details/78426733

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