提交RSA生成密钥工具类

panda-code/src/main/java/org/panda/code/uitl/RSAUtils.java

@@ -0,0 +1,101 @@
+package org.panda.code.uitl;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import java.io.UnsupportedEncodingException;
+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.Base64;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * java RSA加密工具类
+ * @author qi
+ **/
+public class RSAUtils {
+    /**
+     * 密钥长度,越长越慢
+     */
+    private final static int KEY_SIZE = 1024;
+    /**
+     * 算法-RSA
+     */
+    public static final String ALGORITHM_RSA = "RSA";
+    /**
+     * 默认字符集编码 utf-8
+     */
+    public static final String DEFALUT_CHART="utf-8";
+
+
+    /**
+     * 用于封装随机参数的公钥和私钥
+     */
+    private static Map<Integer,String> keyMap = new HashMap<>();
+
+    /**
+     * 生成随机密钥对
+     * @throws NoSuchAlgorithmException
+     */
+    public static void getKeyPair() throws NoSuchAlgorithmException {
+        //keyPairGenerator类用于生成公钥和密钥对,基于RSA算法生成对象
+        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM_RSA);
+        //初始化密钥生成器
+        keyPairGenerator.initialize(KEY_SIZE,new SecureRandom());
+        //生成密钥对,保存在keyPair中
+        KeyPair keyPair = keyPairGenerator.generateKeyPair();
+        //私钥
+        RSAPrivateKey privateKey =(RSAPrivateKey)keyPair.getPrivate();
+        //公钥
+        RSAPublicKey publicKey =(RSAPublicKey) keyPair.getPublic();
+        //得到密钥字符串
+        String publicKeyStr = Base64.getEncoder().encodeToString(publicKey.getEncoded());
+        String privateKeyStr = Base64.getEncoder().encodeToString(privateKey.getEncoded());
+        //将密钥保存到map中
+        //0表示公钥
+        keyMap.put(0,publicKeyStr);
+        //1表示密钥
+        keyMap.put(1,privateKeyStr);
+    }
+
+    /**
+     *  RSA公钥加密
+     * @param str
+     * @param publicKey
+     * @return
+     * @throws NoSuchAlgorithmException
+     * @throws InvalidKeySpecException
+     * @throws NoSuchPaddingException
+     * @throws InvalidKeyException
+     * @throws UnsupportedEncodingException
+     * @throws BadPaddingException
+     * @throws IllegalBlockSizeException
+     */
+    public static String encrypt(String str,String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, UnsupportedEncodingException, BadPaddingException, IllegalBlockSizeException {
+        byte[] decoded = Base64.getDecoder().decode(publicKey);
+        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance(ALGORITHM_RSA).generatePublic(new X509EncodedKeySpec(decoded));
+        Cipher cipher = Cipher.getInstance(ALGORITHM_RSA);
+        cipher.init(Cipher.ENCRYPT_MODE,pubKey);
+        String outStr = Base64.getEncoder().encodeToString(cipher.doFinal(str.getBytes(DEFALUT_CHART)));
+        return outStr;
+    }
+
+    public static String decrypt(String str,String privateKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
+        //64位解码加密后的字符串
+        byte[] inputByte = Base64.getDecoder().decode(str);
+        //base64编码的密钥
+        byte[] decoded = Base64.getDecoder().decode(privateKey);
+        RSAPrivateKey prikey = (RSAPrivateKey) KeyFactory.getInstance(ALGORITHM_RSA).generatePrivate(new PKCS8EncodedKeySpec(decoded));
+        Cipher cipher = Cipher.getInstance(ALGORITHM_RSA);
+        cipher.init(Cipher.DECRYPT_MODE,prikey);
+        String outStr = new String(cipher.doFinal(inputByte));
+        return outStr;
+    }
+
+}