add encryption and description in Spring example

Author: fishercoder1534

pom.xml

@@ -189,6 +189,12 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-crypto</artifactId>
+            <version>6.3.1</version>
+        </dependency>
+
     </dependencies>
 
 

src/main/java/encryption/SpringSecurityCryptoModule.java

@@ -0,0 +1,23 @@
+package encryption;
+
+import org.springframework.security.crypto.keygen.BytesKeyGenerator;
+import org.springframework.security.crypto.keygen.KeyGenerators;
+
+public class SpringSecurityCryptoModule {
+    /**
+     * Reference: https://docs.spring.io/spring-security/site/docs/3.1.x/reference/crypto.html
+     */
+    public static void main(String... args) {
+//        BytesEncryptor encryptor = Encryptors.standard("password", "salt");
+
+        String salt = KeyGenerators.string().generateKey(); // generates a random 8-byte salt that is then hex-encoded
+        System.out.println("salt is: " + salt);
+
+//        TextEncryptor textEncryptor = Encryptors.text("password", "salt");
+
+        BytesKeyGenerator generator = KeyGenerators.secureRandom();
+        byte[] key = generator.generateKey();
+        System.out.println("key is: " + key);
+
+    }
+}