The project directory should kind of look like this:

project/
├── src/
│   ├── Main.java
│   ├── Encrypt.java
│   ├── Decrypt.java
│   ├── Hash.java
│   └── Detect.java
└── lib/
    └── bouncycastle.jar

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Compile with the following command:

javac -cp "lib/*" -d bin src/*.java

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Execute the Main with the following command:

java -cp "bin:lib/*" Main <args> ( for Linux )

java -cp "bin;lib/*" Main <args> ( for Windows )

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You have the following options:

Encryption: encrypt <path/to/textfile> <path/to/keyfile>

Decryption: decrypt <path/to/textfile> <path/to/keyfile>

Hash with all available methods: hash <path/to/textfile>

Hash with specific method: hash <path/to/textfile> <HASH_METHOD>

Hash-detection: detect <path/to/textfile> <path/to/hashfile> <HASH_METHOD>

Currently available hash methods are:

• MD5
• SHA3-256
• RIPEMD160