java_src/examples/helloworld/README.md

# Java Hello World

This is a command-line tool that can encrypt and decrypt small files with
AES128-GCM.

It demonstrates the basic steps of using Tink, namely generating or loading
key material, obtaining a primitive, and using the primitive to do crypto.

It also shows how to add a dependency on Tink using Maven. Please checkout
the pom.xml file.

## Build and Run

### Maven

```shell
git clone https://github.com/google/tink
cd tink/examples/java_src/
mvn package
echo foo > foo.txt
mvn exec:java -Dexec.args="encrypt --keyset test.cfg --in foo.txt --out bar.encrypted"
mvn exec:java -Dexec.args="decrypt --keyset test.cfg --in bar.encrypted --out foo2.txt"
cat foo2.txt
```

### Bazel

```shell
git clone https://github.com/google/tink
cd tink/examples/java_src
bazel build ...
echo foo > foo.txt
./bazel-bin/helloworld/helloworld encrypt --keyset test.cfg --in foo.txt --out bar.encrypted
./bazel-bin/helloworld/helloworld decrypt --keyset test.cfg --in bar.encrypted --out foo2.txt
cat foo2.txt
```