Java中的RSA加解密工具类：RSAUtils
本人手写已测试，大家可以参考使用
package com.mirana.frame.utils.encrypt; import com.mirana.frame.utils.log.LogUtils; 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.nio.charset.Charset; import java.nio.charset.StandardCharsets; import java.security.*; import java.security.spec.InvalidKeySpecException; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; /** * Title：RSA加解密工具 * * @CreatedBy Mirana * @DateTime 2018/3/2315:30 */ public class RSAUtils { // 字符编码格式 public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8; // 换行 public static final String NEXTLINE = System.getProperty("line.separator"); // RSA 算法，Java默认"RSA"="RSA/ECB/PKCS1Padding" public static final String ALGORITHM_RSA = "RSA"; /** * 生成指定长度的keypair，最小长度512，目前1024的长度已经很难破解 * * @param keysize 秘钥对长度 * @return * @throws NoSuchAlgorithmException */ public static KeyPair genKeyPair (int keysize) throws NoSuchAlgorithmException { KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM_RSA); keyPairGenerator.initialize(keysize); return keyPairGenerator.generateKeyPair(); } /** * 公钥加密，默认UTF-8 * * @param contentBytes 要加密的Bytes * @param publickey 公钥 * @return * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws InvalidKeySpecException */ public static byte[] encrypt (byte[] contentBytes, PublicKey publickey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException { Cipher cipher = Cipher.getInstance(ALGORITHM_RSA); cipher.init(Cipher.ENCRYPT_MODE, publickey); byte[] encryptBytes = cipher.doFinal(contentBytes); encryptBytes = Base64.encodeBase64(encryptBytes); return encryptBytes; } /** * 公钥加密字符串 * * @param content 要加密的文本 * @param base64PublickeyStr base64编码后的公钥 * @return * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws InvalidKeySpecException */ public static String encryptStr (String content, String base64PublickeyStr) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException { // publickeyStr-->PublicKey byte[] buffer = Base64.decodeBase64(base64PublickeyStr.getBytes()); KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_RSA); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer); PublicKey publickey = keyFactory.generatePublic(keySpec); return new String(encrypt(content.getBytes(DEFAULT_CHARSET), publickey), DEFAULT_CHARSET); } /** * 私钥解密 * * @param contentBytes 要解密的Bytes * @param privatekey 私钥 * @return * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws InvalidKeySpecException */ public static byte[] decrypt (byte[] contentBytes, PrivateKey privatekey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException { Cipher cipher = Cipher.getInstance(ALGORITHM_RSA); cipher.init(Cipher.DECRYPT_MODE, privatekey); return cipher.doFinal(Base64.decodeBase64(contentBytes)); } /** * 私钥解密字符串，默认UTF-8 * * @param content 要解密的文本 * @param base64PrivatekeyStr Base64编码后的私钥 * @return * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws InvalidKeySpecException */ public static String decryptStr (String content, String base64PrivatekeyStr) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException { // privatekeyStr-->PrivateKey byte[] buffer = Base64.decodeBase64(base64PrivatekeyStr); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer); KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM_RSA); PrivateKey privatekey = keyFactory.generatePrivate(keySpec); return new String(decrypt(content.getBytes(DEFAULT_CHARSET), privatekey), DEFAULT_CHARSET); } /** * RAS加密 * * @param content 原文本 * @param base64PublickeyStr base64编码后的公钥 * @return */ public static String rsaEncrypt (String content, String base64PublickeyStr) { StringBuffer rsaLogStr = new StringBuffer(); rsaLogStr.append(NEXTLINE); rsaLogStr.append("----- [ RSA加密 ] Start -----" + NEXTLINE); rsaLogStr.append("----- [ RSA加密 ] 加密前文本：" + content + NEXTLINE); rsaLogStr.append("----- [ RSA加密 ] 公钥：" + base64PublickeyStr + NEXTLINE); try { content = encryptStr(content, base64PublickeyStr); rsaLogStr.append("----- [ RSA加密 ] 加密后文本：" + content + NEXTLINE); rsaLogStr.append("----- [ RSA加密 ] End -----" + NEXTLINE); LogUtils.info(rsaLogStr); } catch (Exception e) { rsaLogStr.append("----- [ RSA加密 ] 加密时发生异常：" + e.toString() + NEXTLINE); rsaLogStr.append("----- [ RSA加密 ] End -----" + NEXTLINE); LogUtils.error(rsaLogStr); e.printStackTrace(); } return content; } /** * RSA解密 * * @param content 要解密的文本 * @param base64PrivatekeyStr Base64编码后的私钥 * @return */ public static String rsaDecrypt (String content, String base64PrivatekeyStr) { StringBuffer rsaLogStr = new StringBuffer(); rsaLogStr.append(NEXTLINE); rsaLogStr.append("----- [ RSA解密 ] Start -----" + NEXTLINE); rsaLogStr.append("----- [ RSA解密 ] 解密前文本：" + content + NEXTLINE); rsaLogStr.append("----- [ RSA解密 ] 私钥：" + base64PrivatekeyStr + NEXTLINE); try { content = decryptStr(content, base64PrivatekeyStr); rsaLogStr.append("----- [ RSA解密 ] 解密后文本：" + content + NEXTLINE); rsaLogStr.append("----- [ RSA解密 ] End -----" + NEXTLINE); LogUtils.info(rsaLogStr); } catch (Exception e) { rsaLogStr.append("----- [ RSA解密 ] 解密时发生异常：" + e.toString() + NEXTLINE); rsaLogStr.append("----- [ RSA解密 ] End -----" + NEXTLINE); LogUtils.error(rsaLogStr); e.printStackTrace(); } return content; } public static void main (String[] args) { KeyPair keypair = null; try { keypair = genKeyPair(512);// 公钥私钥对 } catch (Exception e) { LogUtils.error("生成公钥私钥发生异常：" + e.toString()); } PublicKey publickey = keypair.getPublic();// 公钥 PrivateKey privatekey = keypair.getPrivate();// 私钥 // 原文本 String content = "{'name':'mmmirana','age':'27','phone':'17112345678'}"; // base64编码后的公钥（一般从文件id_ras.pub中读取） String base64PublickeyStr = Base64.encodeBase64String(publickey.getEncoded()); // base64编码后的私钥（一般从文件id_rsa中读取） String base64PrivatekeyStr = Base64.encodeBase64String(privatekey.getEncoded()); // RSA加密 String encryptedContent = rsaEncrypt(content, base64PublickeyStr); // RSA解密 rsaDecrypt(encryptedContent, base64PrivatekeyStr); } }
测试日志如下：
[INFO ] ----- [ RSA加密 ] Start ----- ----- [ RSA加密 ] 加密前文本：{'name':'mmmirana','age':'27','phone':'17112345678'} ----- [ RSA加密 ] 公钥：MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIrG4j+lLbluoG4n6pJ24YO/j4+0OIRhBFOCdERchN/np3inpo8uFw/tg5m4q1x85juqqzXTKyHrMG+dTwaSgOsCAwEAAQ== ----- [ RSA加密 ] 加密后文本：OH0/+ISqITRTaXX8fej9pDu4v/hcZmFUw6HdxZgDUNbti0SJc8mltW/QlIkODbC116/98/gmSsNTq6bUdmq3mw== ----- [ RSA加密 ] End ----- [INFO ] ----- [ RSA解密 ] Start ----- ----- [ RSA解密 ] 解密前文本：OH0/+ISqITRTaXX8fej9pDu4v/hcZmFUw6HdxZgDUNbti0SJc8mltW/QlIkODbC116/98/gmSsNTq6bUdmq3mw== ----- [ RSA解密 ] 私钥：MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAisbiP6UtuW6gbifqknbhg7+Pj7Q4hGEEU4J0RFyE3+eneKemjy4XD+2DmbirXHzmO6qrNdMrIeswb51PBpKA6wIDAQABAkEAhLs4RhtcIlE2zGUNLEzb4MDlNFLxA1wvYRgS0BeVVvi2+J70tk4fZ/HHyLn5TnICU/87LMStogHfNFTc7Xo3IQIhAMV5xenT2bWwRv0xpg0qgNhcRwO+5Sbak8MA/C7gFr/zAiEAs+e1d95Z/CUJ6KbYsFfjTSTBa6P8eQpeKUrFSg9e8SkCIF86ngposzA+1bz72Eu5F3E+7rALuo3GEkOTkgk43z+pAiBMFIoehg6h3fwBwkVS1egPIKMXZUMI4QSPC8rBFhz9eQIgN4cUN0EdANFCVBHtqQ9I7A2v+S2jk7yhDMsXQc8ddYM= ----- [ RSA解密 ] 解密后文本：{'name':'mmmirana','age':'27','phone':'17112345678'} ----- [ RSA解密 ] End -----
