Auto commit

Main.java

-class Main {
-  public static void main(String[] args) {
-    System.out.println("Hello world!");
-  }
-}
\ No newline at end of file
+import java.io.PrintWriter;
+import java.math.BigInteger;
+import java.util.Scanner;
+
+/**
+ * RSA算法
+ */
+public class RSA {
+
+    private static final BigInteger a = BigInteger.valueOf('a');
+    private static final Scanner sc = new Scanner(System.in);
+    private static final PrintWriter print = new PrintWriter(System.out,true);
+    // 公钥
+    public static BigInteger n;
+    public static BigInteger e;
+    // 私钥
+    public static BigInteger d;
+
+    // 帮助信息
+    private static final String help = "1. 生成密钥  2. RSA加密  3. RSA解密 4.重置数据 5.输入密钥  -1. 退出";
+
+    public static void main(String[] args) {
+        while (true) {
+            print.println("当前数据" + (n == null ? "" : " n = "+n) + (e == null ? "" : " e = "+e) + (d == null ? "" : " d = "+d));
+            print.println(help);
+            int i = sc.nextInt();
+            switch (i) {
+                case 1 -> createN();
+                case 2 -> getCipher();
+                case 3 -> getPlain();
+                case 4 -> init();
+                case 5 -> {
+                    print.println("请输入密钥 n,e,d");
+                    n = sc.nextBigInteger();
+                    e = sc.nextBigInteger();
+                    d = sc.nextBigInteger();
+                }
+                case -1 -> System.exit(0);
+            }
+        }
+
+    }
+
+    private static void init() {
+        n = null;
+        e = null;
+        d = null;
+    }
+
+    private static void getPlain() {
+        if (d == null) {
+            print.println("请输入密钥");
+            d = sc.nextBigInteger();
+        }
+        print.println("请输入密文");
+        getModPow(d);
+    }
+
+    private static void getModPow(BigInteger d) {
+        sc.next().chars().mapToObj(c -> BigInteger.valueOf(c - 'a')).forEach(i -> {
+            BigInteger j = i.modPow(d, n);
+            j = j.add(a);
+            print.print((char) j.intValue());
+        });
+        print.println();
+    }
+
+    private static void createN() {
+        print.println("请输入两个质数p,q");
+        BigInteger p = sc.nextBigInteger();
+        BigInteger q = sc.nextBigInteger();
+        n = p.multiply(q);
+        BigInteger f = p.subtract(BigInteger.ONE).multiply(q.subtract(BigInteger.ONE));
+        e = BigInteger.TWO;
+        while (!f.gcd(e).equals(BigInteger.ONE)) {
+            e = e.add(BigInteger.ONE);
+        }
+        d = e.modInverse(f);
+        print.println("公钥: (" + n + "," + e + ")");
+        print.println("私钥: (" + n + "," + d + ")");
+    }
+
+    private static void getCipher() {
+        if (n == null || e == null) {
+            print.println("请输入公钥n，e");
+            n = sc.nextBigInteger();
+            e = sc.nextBigInteger();
+        }
+        print.println("请输入明文");
+        getModPow(e);
+    }
+}

inscode.nix

-{ pkgs }: {
-    deps = [
-        pkgs.graalvm17-ce
-        pkgs.maven
-    ];
-}
\ No newline at end of file