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initial working commit

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Daniel Gultsch 2016-03-28 12:52:05 +02:00
commit 5821895ae9
2 changed files with 127 additions and 0 deletions
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65
pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>eu.siacs.conversations</groupId>
<artifactId>ImageDownloader</artifactId>
<version>0.1</version>
<dependencies>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.54</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>eu.siacs.conversations.Downloader</mainClass>
</transformer>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>

62
src/main/java/eu/siacs/conversations/Downloader.java Normal file
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package eu.siacs.conversations;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.io.CipherOutputStream;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.GCMBlockCipher;
import org.bouncycastle.crypto.params.AEADParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class Downloader {
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage: java -jar ImageDownloader.jar https://url.tld/filename#C0FFEBABE");
} else {
try {
final URL url = new URL(args[0]);
OutputStream os = setupOutputStream(new PrintStream(System.out), url.getRef());
final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
InputStream inputStream = connection.getInputStream();
connection.connect();
byte[] buffer = new byte[4096];
int count;
while ((count = inputStream.read(buffer)) != -1) {
os.write(buffer, 0, count);
}
} catch (Exception e) {
System.err.println("could not connect to host "+e.getMessage());
}
}
}
private static OutputStream setupOutputStream(OutputStream os, String reference) {
if (reference != null && reference.length() == 96) {
byte[] keyAndIv = hexToBytes(reference);
byte[] key = new byte[32];
byte[] iv = new byte[16];
System.arraycopy(keyAndIv, 0, iv, 0, 16);
System.arraycopy(keyAndIv, 16, key, 0, 32);
AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
cipher.init(false, new AEADParameters(new KeyParameter(key), 128, iv));
return new CipherOutputStream(os, cipher);
} else {
return os;
}
}
private static byte[] hexToBytes(String hex) {
int len = hex.length();
byte[] array = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
array[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4) + Character.digit(hex.charAt(i + 1), 16));
}
return array;
}
}