feat: 개인정보 보호를 위한 암호화 설정 (#3)

src/main/java/yonseigolf/server/util/AesEncryptor.java

@@ -0,0 +1,82 @@
+package yonseigolf.server.util;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import javax.crypto.Cipher;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
+import java.nio.charset.StandardCharsets;
+import java.security.SecureRandom;
+import java.util.Base64;
+
+@Component
+public class AesEncryptor {
+
+    private String ALGORITHM;
+    private String KEY_STR;
+    private byte[] KEY;
+
+    @Autowired
+    public AesEncryptor(@Value("${ALGORITHM}") String algorithm,
+                        @Value("${SECRET_KEY}") String keyStr) {
+        this.ALGORITHM = algorithm;
+        this.KEY_STR = keyStr;
+        this.KEY = KEY_STR.getBytes(StandardCharsets.UTF_8);
+    }
+
+    public String encrypt(String data) {
+
+        if (data == null) {
+            return null;
+        }
+
+        byte[] encryptedBytes = null;
+        try {
+            Cipher cipher = Cipher.getInstance(ALGORITHM);
+            SecretKeySpec secretKey = new SecretKeySpec(KEY, "AES");
+
+            byte[] iv = new byte[16]; // IV length should be 16 bytes for AES
+            new SecureRandom().nextBytes(iv);
+            IvParameterSpec ivSpec = new IvParameterSpec(iv);
+
+            cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);
+            encryptedBytes = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
+
+            byte[] finalData = new byte[iv.length + encryptedBytes.length];
+            System.arraycopy(iv, 0, finalData, 0, iv.length);
+            System.arraycopy(encryptedBytes, 0, finalData, iv.length, encryptedBytes.length);
+
+            encryptedBytes = finalData;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return Base64.getEncoder().encodeToString(encryptedBytes);
+    }
+
+    public String decrypt(String encryptedData) {
+
+        if (encryptedData == null) {
+            return null;
+        }
+
+        byte[] decryptedBytes = null;
+        try {
+            Cipher cipher = Cipher.getInstance(ALGORITHM);
+            SecretKeySpec secretKey = new SecretKeySpec(KEY, "AES");
+
+            byte[] decodedData = Base64.getDecoder().decode(encryptedData);
+            byte[] iv = new byte[16]; // extracting IV from encrypted data
+            System.arraycopy(decodedData, 0, iv, 0, 16);
+
+            IvParameterSpec ivSpec = new IvParameterSpec(iv);
+            cipher.init(Cipher.DECRYPT_MODE, secretKey, ivSpec);
+
+            decryptedBytes = cipher.doFinal(decodedData, 16, decodedData.length - 16);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return new String(decryptedBytes, StandardCharsets.UTF_8);
+    }
+}