添加 rsa 加密工具

jdk/src/main/java/cn/reghao/jutil/jdk/security/RsaCryptor.java

@@ -0,0 +1,66 @@
+package cn.reghao.jutil.jdk.security;
+
+import javax.crypto.Cipher;
+import java.nio.charset.StandardCharsets;
+import java.security.*;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.EncodedKeySpec;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.Base64;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * RSA 加密
+ *
+ * @author reghao
+ * @date 2021-11-18 18:06:50
+ */
+public class RsaCryptor {
+    private static final String ALGORITHM = "RSA";
+    private static final Integer KEY_LENGTH = 2048;
+    private static final String CHARSET = "utf-8";
+    private static final Base64.Encoder encoder = Base64.getEncoder();
+    private static final Base64.Decoder decoder = Base64.getDecoder();
+
+    public static Map<String, String> genKeyPair() throws NoSuchAlgorithmException {
+        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM);
+        keyPairGenerator.initialize(KEY_LENGTH, new SecureRandom());
+        KeyPair keyPair = keyPairGenerator.generateKeyPair();
+
+        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
+
+        String privateKeyStr = new String(encoder.encode(privateKey.getEncoded()));
+        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
+        String publicKeyStr = new String(encoder.encode(publicKey.getEncoded()));
+
+        Map<String, String> keyMap = new HashMap<>();
+        keyMap.put("prikey", privateKeyStr);
+        keyMap.put("pubkey", publicKeyStr);
+        return keyMap;
+    }
+
+    public static String encrypt(String pText, String publicKey) throws Exception {
+        byte[] decoded = decoder.decode(publicKey.getBytes(StandardCharsets.UTF_8));
+        EncodedKeySpec encodedKeySpec = new X509EncodedKeySpec(decoded);
+        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance(ALGORITHM).generatePublic(encodedKeySpec);
+
+        Cipher cipher = Cipher.getInstance(ALGORITHM);
+        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
+        byte[] cBytes = cipher.doFinal(pText.getBytes(CHARSET));
+        return new String(encoder.encode(cBytes));
+    }
+
+    public static String decrypt(String cText, String privateKey) throws Exception {
+        byte[] decoded = decoder.decode(privateKey);
+        EncodedKeySpec encodedKeySpec = new PKCS8EncodedKeySpec(decoded);
+        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance(ALGORITHM).generatePrivate(encodedKeySpec);
+
+        Cipher cipher = Cipher.getInstance(ALGORITHM);
+        cipher.init(Cipher.DECRYPT_MODE, priKey);
+        byte[] cBytes = decoder.decode(cText);
+        return new String(cipher.doFinal(cBytes));
+    }
+}