Secrete

Secrete is a simple ECIES implementation that uses Curve25519.

The Elliptic Curve Integrated Encryption Scheme has been implemented with the following specifications:

Item	Specification
Elliptic Curve	Curve25519
Key Derivation Function	KDF2
Message Authentication Code	HMAC with SHA512
Symmetric Encryption Scheme	AES-256 CBC mode with PKCS7 Padding

using source code from existing repositories, including:

• https://github.com/trevorbernard/curve25519-java
• https://github.com/bcgit/bc-java.git

Many thanks to Trevor Bernard and the guys of The Legion of the Bouncy Castle.

Binary version

The binary distribution can be downloaded from the releases page.

Usage

Generate the key pair

java -jar secrete.jar genKeys

This will generate the two files public.key and private.key under the .secrete folder in the user's home. A password will be required to protect the private key.

The private key is stored using PBKDF2 with SHA-512 and AES-256 CBC mode with PKCS7 Padding.

Change the private key password

To change the password of the private.key under the .secrete folder, use:

java -jar secrete.jar changePwd

Export the public key

java -jar secrete.jar -o <key_file> exportKey

Encrypt a text message

java -jar secrete.jar -k <recipient_key_file> encrypt

Insert the message ending with a "."; the encrypted message will be displayed encoded in Base64.

It is also possible to output the encrypted message to a binary file by specifying the "-o" option:

java -jar secrete.jar -k <recipient_key_file> -o <encrypted_file> encrypt

Decrypt a text message

java -jar secrete.jar decrypt

Insert the Base64 encrypted message, and the password to unlock the private key.

It is also possible to load the encrypted message from the binary file by specifying the "-i" option:

java -jar secrete.jar -i <encrypted_file> decrypt

Encrypt a file

java -jar secrete.jar -k <recipient_key_file> -i <file_to_encrypt> -o <encrypted_file> encrypt

Decrypt a file

java -jar secrete.jar -i <encrypted_file> -o <decrypted_file> decrypt

Insert the password to unlock the private key.

Library usage

Secrete can be used as a library, via the Maven Central Repository:

<dependency>
    <groupId>net.nharyes</groupId>
    <artifactId>secrete</artifactId>
</dependency>

The main classes to use are:

• net.nharyes.secrete.curve.Curve25519KeyPairGenerator
• net.nharyes.secrete.ecies.ECIESHelper

Check the ECIESHelper unit tests for some usage examples.

Author

GitHub @gherynos

License

Secrete is licensed under the Apache License 2.0 since version 1.0.2.