JarCastingLongMapper
Add to your project
<dependency>
<groupId>com.codahale</groupId>
<artifactId>longmapper</artifactId>
<version>0.1.1</version>
</dependency>
Note: module name for Java 9+ is com.codahale.longmapper.
Use the thing
import static java.nio.charset.StandardCharsets.UTF_8;
import com.codahale.longmapper.LongMapper;
class Example {
public static void main(String... args) {
final LongMapper mapper = new LongMapper("ayellowsubmarine".getBytes(UTF_8));
System.out.printf("Mapped %d to %d\n", 200, mapper.map(200));
System.out.printf("Unmapped %d to %d\n", mapper.map(200), mapper.unmap(mapper.map(200)));
}
}
How it works
It encrypts each long as a 64-bit Blowfish block.
Performance
It's fast. Plenty fast.
Benchmark Mode Cnt Score Error Units
Benchmarks.map avgt 20 102.132 ± 8.190 ns/op
Benchmarks.unmap avgt 20 115.311 ± 1.092 ns/op
License
Copyright © 2018 Coda Hale
Distributed under the Apache License 2.0.