rsa加密算法，前后端实现。

2024-07-12 11:14| 来源: 网络整理| 查看: 265

前端js:

　　下载地址：http://travistidwell.com/jsencrypt/

js第一版本：

1 // 对数据加密 2 function encrypt(enStr){ 3 //没有加载jsencrypt.js 4 if(typeof(JSEncrypt) != "function"){ 5 return enStr; 6 } 7 if(!window.rsa){ 8 window.rsa = new JSEncrypt(); 9 window.rsa.setPublicKey("MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgHz+GrcnJ4w246LUsKeodDYKEQW2tUHvneYETB4/WtCWNJNH9A4NXJOKrF5eXtGB6hWw6DfkBrNawQi13Cok30HGAGOsqNC3TrG+lFH/MdnIFLc0bc4SNKy0aL6h9Og+OnEfqyGe9hBmviVkYVONMwXAM+mkd74ZEEw1rlTodKf9AgMBAAE="); 10 } 11 12 var result = window.rsa.encrypt(enStr); 13 // 加密失败返回原数据 14 if(result === false){ 15 return enStr; 16 } 17 return JSON.stringify(result); 18 }

ps：经测试发现，rsa最多只能对117个字节进行加密。超过117个字节就会加密失败。

js第二版本：

思路：若超过117个字节，就切分开分别进行加密。

1 // 对数据分段加密 2 function segmentEncrypt(enStr){ 3 if(typeof(JSEncrypt) === "function"){ 4 if(!window.rsa){ 5 window.rsa = new JSEncrypt(); 6 window.rsa.setPublicKey("MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgHz+GrcnJ4w246LUsKeodDYKEQW2tUHvneYETB4/WtCWNJNH9A4NXJOKrF5eXtGB6hWw6DfkBrNawQi13Cok30HGAGOsqNC3TrG+lFH/MdnIFLc0bc4SNKy0aL6h9Og+OnEfqyGe9hBmviVkYVONMwXAM+mkd74ZEEw1rlTodKf9AgMBAAE="); 7 } 8 }else{ 9 return enStr; 10 } 11 12 var result = [], 13 offSet = 0, 14 cache = '', 15 i = 1, 16 inputLen = enStr.length; 17 18 while (inputLen - offSet > 0) { 19 if (inputLen - offSet > 117) { 20 cache = window.rsa.encrypt(enStr.substring(offSet, 117 * i)); 21 } else { 22 cache = window.rsa.encrypt(enStr.substring(offSet)); 23 } 24 // 加密失败返回原数据 25 if(cache === false){ 26 return enStr; 27 } 28 offSet = i++ * 117; 29 30 result.push(cache); 31 } 32 return JSON.stringify(result); 33 }

java代码：

1 package com.test.utils; 2 3 import java.io.ByteArrayOutputStream; 4 import java.security.Key; 5 import java.security.KeyFactory; 6 import java.security.KeyPair; 7 import java.security.KeyPairGenerator; 8 import java.security.SecureRandom; 9 import java.security.interfaces.RSAPrivateKey; 10 import java.security.interfaces.RSAPublicKey; 11 import java.security.spec.PKCS8EncodedKeySpec; 12 import java.security.spec.X509EncodedKeySpec; 13 import java.util.HashMap; 14 import java.util.Map; 15 16 import javax.crypto.Cipher; 17 18 import org.apache.commons.codec.binary.Base64; 19 import org.slf4j.Logger; 20 import org.slf4j.LoggerFactory; 21 22 public class RSAUtil { 23 private static Logger logger = LoggerFactory.getLogger(RSAUtil.class); //日志记录 24 private static final String KEY_ALGORITHM = "RSA"; 25 26 //临时使用 27 public static final String RSA_PUB_KEY = "MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgHz+GrcnJ4w246LUsKeodDYKEQW2 28 tUHvneYETB4/WtCWNJNH9A4NXJOKrF5eXtGB6hWw6DfkBrNawQi13Cok30HGAGOs 29 qNC3TrG+lFH/MdnIFLc0bc4SNKy0aL6h9Og+OnEfqyGe9hBmviVkYVONMwXAM+mk 30 d74ZEEw1rlTodKf9AgMBAAE="; 31 public static final String RSA_PRI_KEY = "MIICWgIBAAKBgHz+GrcnJ4w246LUsKeodDYKEQW2tUHvneYETB4/WtCWNJNH9A4N 32 XJOKrF5eXtGB6hWw6DfkBrNawQi13Cok30HGAGOsqNC3TrG+lFH/MdnIFLc0bc4S 33 NKy0aL6h9Og+OnEfqyGe9hBmviVkYVONMwXAM+mkd74ZEEw1rlTodKf9AgMBAAEC 34 gYAv3vJEa06OOQd9+Y+e5rl7aOeUFKHfGvKSgdrVStZxRNXmAozKRPvL1jSl/+a4 35 vtT0cci+fyrBzmRX/a7QxUZr1ROryeqv/DLnz8b1fXbIIXfO0MiNniytG0qzEHda 36 Vxof3reibaHLCL6wM266qgTVd2FMo8igATUgWvpMS/xuAQJBAMBcyxa/Vv496Fq7 37 ynvuXWIzdCJSYBe9CFjICgOeHLrz+9d66GiHfjkgU/RygUhLbgA1ogEsx+/4LshV 38 t3Tt02ECQQCmV771jice594L8PQmfSgHEZpzk8F2LkGB8BznVzcRpr/EtI6Bfux5 39 +HWAGW7CEwvv5r1oPzbYd9lggkanNXYdAkBvBd+NTHfoG1D89T/jkWrCX9IacRLX 40 AJpNq37kIaCRYnorHtv+YJ1AWWE7R89IK4jchBfxt6fZ35MYuyg8S3thAkAZSPlE 41 Bkm4DvLXydazCw9Mk8ZwjyM3PazDfaZHHCDI1BoOYovO72Yu3C+wOy103sRPwTlF 42 YWaK3Rzz6JmozR2ZAkBQsQhOXafSG1cGGx43mSzSAtBD1kfQAD2YVvR4B9NtOoWc 43 6Zyxf+Ek2P21ZIEWihTCM7XS9BYkJWHvcyun7Xeb"; 44 45 //map 键名 46 public static final String PUBLIC_KEY = "RSAPublicKey"; 47 public static final String PRIVATE_KEY = "RSAPrivateKey"; 48 49 50 /** 51 * 初始化密钥 52 * @return 53 */ 54 public static Map initKey() { 55 Map map = new HashMap(); 56 try { 57 // 随机生成密钥对 58 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM); 59 60 // 按照指定字符串生成密钥对 61 keyPairGen.initialize(1024, new SecureRandom()); 62 63 KeyPair keyPair = keyPairGen.generateKeyPair(); 64 65 // 公钥 66 RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); 67 String pubkey = new String(Base64.encodeBase64(publicKey.getEncoded())); 68 69 // 私钥 70 RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); 71 String prikey = new String(Base64.encodeBase64(privateKey.getEncoded())); 72 73 map.put(PUBLIC_KEY, pubkey); 74 map.put(PRIVATE_KEY, prikey); 75 } catch (Exception e) { 76 logger.error("生成秘钥失败", e); 77 } 78 return map; 79 } 80 /** 81 * 公钥加密 82 * 83 * @param data 84 * @param key 85 * @return 86 */ 87 public static String encryptByPublicKey(String data, String key) { 88 try { 89 // 取得公钥 90 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(Base64.decodeBase64(key)); 91 KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); 92 Key publicKey = keyFactory.generatePublic(x509KeySpec); 93 94 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); 95 cipher.init(Cipher.ENCRYPT_MODE, publicKey); 96 97 byte[] encryptedData = data.getBytes("utf-8"); 98 int inputLen = encryptedData.length; 99 ByteArrayOutputStream out = new ByteArrayOutputStream(); 100 int offSet = 0; 101 byte[] cache; 102 int i = 0; 103 // 对数据分段加密 104 while (inputLen - offSet > 0) { 105 if (inputLen - offSet > 117) { 106 cache = cipher.doFinal(encryptedData, offSet, 117); 107 } else { 108 cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet); 109 } 110 out.write(cache, 0, cache.length); 111 i++; 112 offSet = i * 117; 113 } 114 byte[] decryptedData = out.toByteArray(); 115 out.close(); 116 117 return new String(Base64.encodeBase64(decryptedData)); 118 } catch (Exception e) { 119 logger.error("公钥加密异常!", e); 120 } 121 return data; 122 } 123 124 /** 125 * 私钥解密 126 * 127 * @param data 128 * @param key 129 * @return 130 */ 131 public static String decryptByPrivateKey(String data, String key) { 132 try { 133 // 对密钥解密 134 byte[] keyBytes = Base64.decodeBase64(key); 135 136 // 取得私钥 137 PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); 138 KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); 139 Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec); 140 141 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); 142 cipher.init(Cipher.DECRYPT_MODE, privateKey); 143 144 byte[] encryptedData = Base64.decodeBase64(data); 145 146 int inputLen = encryptedData.length; 147 ByteArrayOutputStream out = new ByteArrayOutputStream(); 148 int offSet = 0; 149 byte[] cache; 150 int i = 0; 151 // 对数据分段解密 152 while (inputLen - offSet > 0) { 153 if (inputLen - offSet > 128) { 154 cache = cipher.doFinal(encryptedData, offSet, 128); 155 } else { 156 cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet); 157 } 158 out.write(cache, 0, cache.length); 159 i++; 160 offSet = i * 128; 161 } 162 byte[] decryptedData = out.toByteArray(); 163 out.close(); 164 165 return new String(decryptedData, "utf-8"); 166 167 } catch (Exception e) { 168 logger.error("私钥解密异常", e); 169 } 170 return data; 171 } 172 }

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