Cryptoutils

Provides an ultra simple wrapper around Java's Cryptography extension (JCE) and factory methods for AES 128 Bit symmetric key ciphers, and RSA 2048 Bit asymmetric key ciphers with encryption/decryption methods. See unit test cases for details.

Building from source

Use maven to build:

mvn clean package

Import

Declare as dependency in maven

<dependency>
  <groupId>com.simonmittag</groupId>
  <artifactId>cryptoutils</artifactId>
  <version>1.0</version>
</dependency>

Using the library from code

1. Use AsymmetricRSAKeyPairGenerator to create public/private keys (for asymmetric cipher) and save them to disk.

   mvn -q exec:java -Dexec.mainClass="com.simonmittag.cryptoutils.asymmetric.AsymmetricRSAKeyPairGenerator"

2. Create a random 16 byte String each for symmetric secret key and init vector (for the symmetric cipher).

3. put cryptoutils-1.0-SNAPSHOT.jar in your classpath, then use it like so from within code, replacing the property values with the base64 (UTF-8 Strings are ok for symmetric) encoded keys you generated in #1 and #2:

   System.setProperty("ASYMMETRIC_PRIVATE_KEY", "BASE64_PRIVATE_KEY") System.setProperty("ASYMMETRIC_PUBLIC_KEY", "BASE64_PUBLIC_KEY")

   or

   System.setProperty("SYMMETRIC_SECRET_KEY", "16_BYTE_SYMMETRIC_KEY"); System.setProperty("INIT_VECTOR", "16_BYTE_INIT_VECTOR");

3b) alternatively define the above properties as unix environment variables on the shell before starting the Java process that contains the client code.

4. Create a cipher by using the Facade class in either package like so:

   SimpleCipher cipher = new CipherFacade();

   String encrypted = cipher.encrypt("Hello World"); String decrypted = cipher.decrypt(encrypted);

Known Issues

Cryptoutils was tested on Oracle JDK8+ with the built-in JCE provider. Other environments may vary

License

Cryptoutils uses the Apache license.