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

Download the latest release:

• JAR file with dependencies: secrete.zip
• GPG Signature: secrete.zip.sig

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.

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.

Copyright and license

Copyright (C) 2015 Luca Zanconato (luca.zanconato@nharyes.net)

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.