Curve25519-keyshare

Elliptic Curve Diffie-Hellman

License	Public Domain
Categories	Net
GroupId	com.github.netricecake
ArtifactId	x25519
Last Version	2.0
Release Date	Apr 5, 2020
Type	jar
Description	Curve25519-keyshare Elliptic Curve Diffie-Hellman
Project URL	https://github.com/NetRiceCake/Curve25519-keyshare
Source Code Management	https://github.com/NetRiceCake/Curve25519-keyshare

Download x25519

Filename	Size
x25519-2.0.pom
x25519-2.0.jar	6 KB
x25519-2.0-sources.jar	3 KB
x25519-2.0-javadoc.jar	23 KB

How to add to project

Apache Maven

<!-- https://jarcasting.com/artifacts/com.github.netricecake/x25519/ -->
<dependency>
    <groupId>com.github.netricecake</groupId>
    <artifactId>x25519</artifactId>
    <version>2.0</version>
</dependency>

Gradle Groovy

// https://jarcasting.com/artifacts/com.github.netricecake/x25519/
implementation 'com.github.netricecake:x25519:2.0'

Gradle Kotlin

// https://jarcasting.com/artifacts/com.github.netricecake/x25519/
implementation ("com.github.netricecake:x25519:2.0")

Apache Buildr

'com.github.netricecake:x25519:jar:2.0'

Apache Ivy

<dependency org="com.github.netricecake" name="x25519" rev="2.0">
  <artifact name="x25519" type="jar" />
</dependency>

Groovy Grape

@Grapes(
@Grab(group='com.github.netricecake', module='x25519', version='2.0')
)

Scala SBT

libraryDependencies += "com.github.netricecake" % "x25519" % "2.0"

Leiningen

[com.github.netricecake/x25519 "2.0"]

Dependencies

There are no dependencies for this project. It is a standalone project that does not depend on any other jars.

Project Modules

There are no modules declared in this project.

Curve25519 Keyshare

Curve25519 is an elliptic curve offering 128 bits of security and designed for use with the elliptic curve Diffie–Hellman (ECDH) key agreement scheme. It is one of the fastest ECC curves

Using in Gradle :

repositories {
  mavenCentral()
}

dependencies {
  implementation 'com.github.netricecake:x25519:2.0'
}

Using in Maven :

<dependencies>
  <dependency>
    <groupId>com.github.netricecake</groupId>
    <artifactId>x25519</artifactId>
    <version>2.0</version>
  </dependency>
</dependencies>

How to use :

Make private key :

Curve25519.generateRandomKey() //Return 32 byte random bytes

Make public key from private key :

Curve25519.publicKey(byte[] privateKey)

Get shared secret :

Curve25519.sharedSecrete(byte[] privateKey, byte[] publicKey) //Private key and Public key must be 32 byte array

Example :

byte[] aPrivate = Curve25519.generateRandomKey();
byte[] aPublic = Curve25519.publicKey(aPrivate);

byte[] bPrivate = Curve25519.generateRandomKey();
byte[] bPublic = Curve25519.publicKey(bPrivate);

byte[] aSharedSecret = Curve25519.sharedSecret(aPrivate, bPublic);
byte[] bSharedSecret = Curve25519.sharedSecret(bPrivate, aPublic);

Additional

Version 1.0 has one big problem. Please use version 2.0.

Versions

Version
2.0 Apr 5, 2020
1.0 Apr 1, 2020