Merge pull request #4 from toss/secure_random

secure random 을 매번 생성하지 않고 한번 생성해 놓은 것 재사용

Author: kaifer

README.md

@@ -6,7 +6,7 @@ JAVA 1.8버전 사용자들을 위한 세션키 발급 및 개인정보 암복
 
 예시)
 ```
-<version>0.0.4</version>
+<version>0.0.5</version>
 ```
 
 pom.xml 을 사용하시면 아래와 같이 추가해주세요.

build.gradle

@@ -6,7 +6,7 @@ plugins {
 }
 
 group 'com.github.toss'
-version '0.0.4'
+version '0.0.5'
 
 sourceCompatibility = JavaVersion.VERSION_1_6
 targetCompatibility = JavaVersion.VERSION_1_6
@@ -25,8 +25,8 @@ repositories {
 
 dependencies {
     implementation 'commons-codec:commons-codec:1.15'
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.0-M1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.9.0-M1'
 
 }
 

src/main/java/im/toss/cert/sdk/SecureKeyGenerator.java

@@ -5,15 +5,17 @@
 import java.security.SecureRandom;
 
 class SecureKeyGenerator {
+    private static final SecureRandom secureRandom = new SecureRandom();
+
     static String generateKey(int aesKeyBitLength) throws NoSuchAlgorithmException {
         KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
-        keyGenerator.init(aesKeyBitLength, new SecureRandom());
+        keyGenerator.init(aesKeyBitLength, secureRandom);
         return Base64Utils.encodeToString(keyGenerator.generateKey().getEncoded());
     }
 
     static String generateRandomBytes(int lengthInBits) {
         byte[] bytes = new byte[lengthInBits / 8];
-        new SecureRandom().nextBytes(bytes);
+        secureRandom.nextBytes(bytes);
         return Base64Utils.encodeToString(bytes);
     }
 }