DaVinci

Fastest and secure way to encrypt and decrypt large files.

Installation

You can download binary files for each platform from the latest releases.

Usage

• Generate passphrase (stored in a file)

davinci new-passphrase --folder ./path-to-folder

Returns a passphrase in the file passphrase.txt

• Generate public and private key (stored in a file)

davinci new-keypair --size 2048 --passphrase ./passphrase.txt --folder ./path-to-folder

Returns the public key in the file publicKey.pem and the private key in the file privateKey.pem.

• Generate Symmetric key (stored in a file)

davinci key --folder ./path-to-folder

Return the symmetric key in the file key.txt.

• Encrypt a file

davinci encrypt --input ./file.ext --output ./file-decrypted.ext --key ./key.txt --passphrase ./passphrase.txt --public-key ./publicKey.pem

Encrypts the file file.ext using the key key.txt (encrypted using RSA) and stores the result in file-decrypted.ext.

• Decrypt a file

davinci decrypt --input ./file-decrypted.ext --output ./file.ext --passphrase ./passphrase.txt --private-key ./privateKey.pem

Decrypts the file file-decrypted.ext using the key key.txt (encrypted using RSA) and stores the result in file.ext.

Building (obfuscated version)

go install

bash build.sh

# or

chmod +x build.sh
./build.sh

Algorithm Specification

Key Generation:

• Generate the public and private key pair, afterwards we call this pubK and privK.
• Generate the symmetric key, afterwards we call this R.

Encryption:

• Encrypt symmetric key using the public key. Enc(R, pubK), afterwards we call this R_enc.
• Encrypt file using the symmetric key. Enc(file, R), afterwards we call this file_enc. The generated file will be in this format: R_enc + \n + file_enc

Decryption:

• Decrypt symmetric key using the private key. Dec(R_enc, privK)=R
• Decrypt file using the decrypted symmetric key. Dec(file_enc, R)

Requirements

• Golang 1.16+
• Garble https://github.com/burrowers/garble (optional, for obfuscation binary build file)

Dependencies

• CLI Framework
  • github.com/cpuguy83/go-md2man/v2
  • github.com/russross/blackfriday/v2
  • github.com/urfave/cli/v2
  • github.com/xrash/smetrics
• Source code
  • strconv
  • encoding/base64
  • crypto/aes
  • crypto/cipher
  • crypto/rand
  • crypto/rsa
  • crypto/sha256
  • crypto/x509
  • encoding/pem
  • fmt
  • io/ioutil
  • os
  • path/filepath