ECC-25519
This project helps to use elliptic curve cryptography (ECC) with Curve25519 by Daniel J Bernstein. It combines multiple libraries.
All credit goes to following libraries. Please respect their licenses!
Android:
Java:
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dependencies {
compile 'net.vrallev.ecc:ecc-25519-android:1.0.3' // Android
compile 'net.vrallev.ecc:ecc-25519-java:1.0.3'
// JVM
}
Usage
byte[] seed = "My random seed".getBytes();
byte[] privateKey = KeyHolder.createPrivateKey(seed);
// creates a valid private key (seed hashed with SHA-256) KeyHolder keyHolder = new KeyHolder(privateKey);
// computes valid public keys Ecc25519Helper helper = new Ecc25519Helper(keyHolder);
// generate our helper class byte[] sharedSecret = helper.diffieHellman();
// you can also pass a private and public key byte[] message = "My message".getBytes();
byte[] signature = helper.sign(message);
// computes the signature with the private key boolean validSignature = helper.isValidSignature(message, signature);
// checks the message with the public key from keyHolder instanceLicense
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.