RSAUtil

package com.zhuyun.rsa; import java.io.IOException; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import javax.crypto.Cipher; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class RSAUtil { //生成秘钥对 public static KeyPair getKeyPair() throws Exception { KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(2048); KeyPair keyPair = keyPairGenerator.generateKeyPair(); return keyPair; } //获取公钥(Base64编码) public static String getPublicKey(KeyPair keyPair){ PublicKey publicKey = keyPair.getPublic(); byte[] bytes = publicKey.getEncoded(); return byte2Base64(bytes); } //获取私钥(Base64编码) public static String getPrivateKey(KeyPair keyPair){ PrivateKey privateKey = keyPair.getPrivate(); byte[] bytes = privateKey.getEncoded(); return byte2Base64(bytes); } //将Base64编码后的公钥转换成PublicKey对象 public static PublicKey string2PublicKey(String pubStr) throws Exception{ byte[] keyBytes = base642Byte(pubStr); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(keySpec); return publicKey; } //将Base64编码后的私钥转换成PrivateKey对象 public static PrivateKey string2PrivateKey(String priStr) throws Exception{ byte[] keyBytes = base642Byte(priStr); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(keySpec); return privateKey; } //公钥加密 public static byte[] publicEncrypt(byte[] content, PublicKey publicKey) throws Exception{ Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] bytes = cipher.doFinal(content); return bytes; } //私钥解密 public static byte[] privateDecrypt(byte[] content, PrivateKey privateKey) throws Exception{ Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] bytes = cipher.doFinal(content); return bytes; } //字节数组转Base64编码 public static String byte2Base64(byte[] bytes){ BASE64Encoder encoder = new BASE64Encoder(); return encoder.encode(bytes); } //Base64编码转字节数组 public static byte[] base642Byte(String base64Key) throws IOException{ BASE64Decoder decoder = new BASE64Decoder(); return decoder.decodeBuffer(base64Key); } }

TestRSA

讯享网

讯享网package com.zhuyun.test; import java.security.KeyPair; import java.security.PrivateKey; import java.security.PublicKey; import org.junit.Test; import com.zhuyun.rsa.RSAUtil; public class TestRSA { @Test public void testRSA(){ try { //===============生成公钥和私钥，公钥传给客户端，私钥服务端保留================== //生成RSA公钥和私钥，并Base64编码 KeyPair keyPair = RSAUtil.getKeyPair(); String publicKeyStr = RSAUtil.getPublicKey(keyPair); String privateKeyStr = RSAUtil.getPrivateKey(keyPair); System.out.println("RSA公钥Base64编码:" + publicKeyStr); System.out.println("RSA私钥Base64编码:" + privateKeyStr); //=================客户端================= //hello, i am infi, good night!加密 String message = "hello, i am infi, good night!"; //将Base64编码后的公钥转换成PublicKey对象 PublicKey publicKey = RSAUtil.string2PublicKey(publicKeyStr); //用公钥加密 byte[] publicEncrypt = RSAUtil.publicEncrypt(message.getBytes(), publicKey); //加密后的内容Base64编码 String byte2Base64 = RSAUtil.byte2Base64(publicEncrypt); System.out.println("公钥加密并Base64编码的结果：" + byte2Base64); // 网络上传输的内容有Base64编码后的公钥 和 Base64编码后的公钥加密的内容 //===================服务端================ //将Base64编码后的私钥转换成PrivateKey对象 PrivateKey privateKey = RSAUtil.string2PrivateKey(privateKeyStr); //加密后的内容Base64解码 byte[] base642Byte = RSAUtil.base642Byte(byte2Base64); //用私钥解密 byte[] privateDecrypt = RSAUtil.privateDecrypt(base642Byte, privateKey); //解密后的明文 System.out.println("解密后的明文: " + new String(privateDecrypt)); } catch (Exception e) { e.printStackTrace(); } } }

测试结果如下：

RSA公钥Base64编码:MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA20p3Q88SmVUPpA+r/0hWY/LbMCsllwXK UrXY13pG26BKsgtMm6IAGr6psS8cQ+AU75RpH3lTtt81wIfCHm9+vo4kVt66y8G0kfYSJ9Qlw2oH 5lwab8knPPb+NQNwE7WvceRczKh4XIEfNcgXZyKrcDUIpIsP6rNbZ70JYRhYiagqyLsb39ib4eO6 Zf6nmnrl3NPGeW4qFoivNudAld5E04gt2vCEEpuVt3x1/W3lVzD2gzz9rfkzjFvWwfGYjHMcZZNH Z1h1G60ssSHh7WKV8f6EglPRQssimUKXX4De6g5SVABPs6MEOj0RYYyunJ8unA448u7/TCcMjV/b vnndDwIDAQAB RSA私钥Base64编码:MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDbSndDzxKZVQ+kD6v/SFZj8tsw KyWXBcpStdjXekbboEqyC0ybogAavqmxLxxD4BTvlGkfeVO23zXAh8Ieb36+jiRW3rrLwbSR9hIn 1CXDagfmXBpvySc89v41A3ATta9x5FzMqHhcgR81yBdnIqtwNQikiw/qs1tnvQlhGFiJqCrIuxvf 2Jvh47pl/qeaeuXc08Z5bioWiK8250CV3kTTiC3a8IQSm5W3fHX9beVXMPaDPP2t+TOMW9bB8ZiM cxxlk0dnWHUbrSyxIeHtYpXx/oSCU9FCyyKZQpdfgN7qDlJUAE+zowQ6PRFhjK6cny6cDjjy7v9M JwyNX9u+ed0PAgMBAAECggEBALu/X6kQqw3YQ9HlEQ85sa1VCdCNwFsyu+xggMzLhcsXy5vwDKDa 7Ff5kXN/sCV0vrf4SqCF0eSp6m1yTgKc1tjy/a3ad/dnWt/028p52fMa3rSdeozmnc+WcEKXNOfL D/Dk4YbfXl1kt4HmVBMbHcitvz6RSQlakhGZSWR14afIWzmcyWSkowXU+u/KDdS84kta0FN72KJp XHG4vkn6cWBNCCtDg9Fso4MWXCn5/wq9N73M/y6u0Pl9grxMzmV5f/GwhoJnGklaPW8kQyh71oGB 783TLnp3t9uLWEwGNi5WJbrYcv3XhVqNqH9fKX2UD3cv6TZwfrXQyabNY/WzX8ECgYEA8iOUFAz9 3psYx5OdyKuxYPq242JOtq1UDhe71Z7linUD8oKF67rFDoaDkQUkpd6VBh/88nStA4a8nfLt3KN4 vKfC51doBVyD7W6rtbNuglaWxm+l335l482MLpjpu0l3YHvd/ku43Y7CQ01orMLmomNApM+dpo6H PWI3uFGMk38CgYEA59gPdyQs++FsgtZML7P7nDlHPMJ6rBgHuxYcvFsYnQwigGt2KRscB0d76eL8 4HDTCtO9Lb6x7EuZTtP2Xze8XRSnYEI/Kc1SE90/zhcVH2GWcBn76mL+u/vsVp64osfe964A4DgK /HnO3kL4q0K25DCOlAuMc+UliZ7GKRZMPnECgYBz4Gjl6422cRy7rb4NoXTCh1jsmkg3Dd2y3NLM GT2aNAOOk74JIJlbKS5fQUnXgxxoEPjZAtMlY95x7Ca+txB5oAMa+O5T2oFcJ+FOlC7new6uqhGE UhXqnZxfVFhOg4r4hm6nWo9+n+oBkVLtklwTDFKMTLsSURURYCZwM76FewKBgF6T7mMs98jdAfYx 06yWIKtvVlc8Au0XdHfmolxYUScn3x9CN1a3f2ycxbj45y3r+Lvu+rqhk1WQ1X6py1S2mPnjxg/n lnrIDpaZ6EB7fBtsJQGgJ/tK3R30vEntv+Zv4M5rRmIxmpG6YyCac3Tx50gZYuCUAXz52qFUiwQR 25KRAoGAKiM+cNZLGq6ksesjvC5jpekZMAaiFwZa1EmYkDQ7MZeRBm8whOok2/h8nmw4uJVboipI K7qjqSaHQrMJNLhNMZ0BsOR/I0vJkPuqKI38QHVxRMnaqWb/KXljqY+/b6PQ16RYjjN7V6+/IkOw 9Cks8paAHqEwho2Z/Q8sntNbyVQ= 公钥加密并Base64编码的结果：rbHqJI9jlPLj/n4VP7d4jJRG1WDsDoWYib4BGjXEep6ym9FLiuCKCEwTDPuvvRzlH2BVFjkA0nN+ cjDo/u4PPofxK0a8Ipz0xYvnnQc9q+k8r0QD1uTx8PmnZLEv4rjwfIra/ho8VpYkPA7F1KkwDTyI RIL06hngkhCi1aDym5oIP4vv+kxvi1uArVU04afXo6K4MTtzAesbG8f/qLHV7ywcBVNvb0QnuLNX 7jAWtfHfEGQibuA1EKbh35RcTjKlSW6vHTmg/f3fdHAfwKM/eh9LdMUjpsmfUoFfm8Ep7avjXbn+ 12aXhtVZy8EYLIf1ZckefM95F808XN4HIsth6A== 解密后的明文: hello, i am infi, good night!

转自：https://blog.csdn.net/_/article/details/