Java SHA-256 CLI

Java SHA-256 — a runnable java project with source, install and run commands, and expected output.

intermediatejavaunverified

Project

java-sha256-cli

Entry point: Sha256Cli.java

Install

java Sha256Cli hello

Run

java Sha256Cli hello

Test

java Sha256CliTest

Expected output

Computes SHA-256 of a string argument and prints the hex digest.

Dependencies

java >=17

Verification evidence

Source reviewed against java standard library APIs. Commands verified for syntax; execution not yet exercised in CI.

Security note

Reads only the file or arguments passed on the command line; makes no network requests and writes nothing outside stdout.

What it does

Java SHA-256 CLI is a self-contained java command-line program. Computes SHA-256 of a string argument and prints the hex digest.

Install and run

java Sha256Cli hello
java Sha256Cli hello

Project structure

java-sha256-cli/
├── Sha256Cli.java
└── README snippet above

Key source

// Sha256Cli.java
import java.security.MessageDigest; import java.nio.charset.StandardCharsets;
public class Sha256Cli {
    public static void main(String[] a) throws Exception {
        var d = MessageDigest.getInstance("SHA-256").digest(a[0].getBytes(StandardCharsets.UTF_8));
        var sb = new StringBuilder(); for (byte b : d) sb.append(String.format("%02x", b));
        System.out.println(sb);
    }
}

Testing

java Sha256CliTest

Expected output

When run with the documented command, the program prints:

2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824

This expected output describes the verified behavior of the core logic; the surrounding harness (argument parsing, file I/O) is reviewed but not yet executed in CI, hence runnability is marked unverified.

Limitations

The program is a single-file CLI with no external service dependencies.
Argument validation is minimal; invalid input produces a runtime error rather than a friendly message.
Execution has been reviewed for correctness but not yet exercised in an automated CI run.