Add key generation, service and controller

MiniKms/src/main/java/ftn/security/minikms/controller/KeyManagementController.java

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+package ftn.security.minikms.controller;
+
+import ftn.security.minikms.dto.KeyDTO;
+import ftn.security.minikms.service.KeyService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.security.NoSuchAlgorithmException;
+
+@RestController
+@RequestMapping(value = "/api/v1/keys")
+public class KeyManagementController {
+    @Autowired
+    private KeyService keyService;
+
+    @PostMapping("/create")
+    public ResponseEntity<KeyDTO> createKey(@RequestBody KeyDTO dto) throws NoSuchAlgorithmException {
+        String id = keyService.createKey(dto.getKeyType());
+        dto.setId(id);
+        return new ResponseEntity<>(dto, HttpStatus.CREATED);
+    }
+    @PostMapping("/rotate")
+    public ResponseEntity<KeyDTO> rotateKey(@RequestBody KeyDTO dto){
+        keyService.rotateKey(dto.getKeyType(), dto.getId());
+        return new ResponseEntity<>(dto, HttpStatus.CREATED);
+    }
+    @PutMapping("/delete/{id}")
+    public ResponseEntity<String> deleteKey(@PathVariable String id){
+        keyService.deleteKey(id);
+        return new ResponseEntity<>(id, HttpStatus.OK);
+    }
+
+}

MiniKms/src/main/java/ftn/security/minikms/dto/KeyDTO.java

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+package ftn.security.minikms.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+public class KeyDTO {
+    private String id;
+    private String alias;
+    private String keyType;
+}

MiniKms/src/main/java/ftn/security/minikms/service/AES.java

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+package ftn.security.minikms.service;
+
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+import java.security.NoSuchAlgorithmException;
+
+public class AES {
+    public static String createKey() throws NoSuchAlgorithmException {
+        SecretKey key = generateKey();
+        //save key
+        return "keyId";
+    }
+    private static SecretKey generateKey() throws NoSuchAlgorithmException {
+        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
+        keyGenerator.init(256);
+        return keyGenerator.generateKey();
+    }
+    public static void rotateKey(String Id){
+        //rotate
+    }
+}

MiniKms/src/main/java/ftn/security/minikms/service/HMAC.java

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+package ftn.security.minikms.service;
+
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
+public class HMAC {
+    public static String createKey() throws NoSuchAlgorithmException {
+        SecretKey key = generateKey();
+        //save key
+        return "keyId";
+    }
+    private static SecretKey generateKey() throws NoSuchAlgorithmException {
+        KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacSHA512");
+        keyGenerator.init(256, SecureRandom.getInstanceStrong());
+        return keyGenerator.generateKey();
+    }
+    public static void rotateKey(String Id){
+        //rotate
+    }
+}

MiniKms/src/main/java/ftn/security/minikms/service/KeyService.java

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+package ftn.security.minikms.service;
+
+import org.springframework.stereotype.Service;
+
+import java.security.InvalidParameterException;
+import java.security.NoSuchAlgorithmException;
+
+@Service
+public class KeyService {
+    public String createKey(String keyType) throws NoSuchAlgorithmException, InvalidParameterException {
+        return switch (keyType) {
+            case "symmetric" -> AES.createKey();
+            case "asymmetric" -> RSA.createKey();
+            case "hmac" -> HMAC.createKey();
+            default -> throw new InvalidParameterException();
+        };
+    }
+    public void deleteKey(String Id){
+        //delete from database
+    }
+    public void rotateKey(String keyType, String keyId) throws InvalidParameterException {
+        switch(keyType){
+            case "symmetric" -> AES.rotateKey(keyId);
+            case "asymmetric" -> RSA.rotateKey(keyId);
+            case "hmac" -> HMAC.rotateKey(keyId);
+            default -> throw new InvalidParameterException();
+        }
+    }
+}

MiniKms/src/main/java/ftn/security/minikms/service/RSA.java

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+package ftn.security.minikms.service;
+
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+
+public class RSA {
+    public static String createKey() throws NoSuchAlgorithmException {
+        KeyPair key = generateKey();
+        //save key
+        return "keyId";
+    }
+    private static KeyPair generateKey() throws NoSuchAlgorithmException {
+        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
+        generator.initialize(2048);
+        return generator.generateKeyPair();
+    }
+    public static void rotateKey(String Id){
+        //rotate
+    }
+}