lcfr-eth / EthCrypt

EthCrypt

Use ECIES to encrypt text and files <= 1G using an ethereum public key.

Decrypt using corresponding private key.

Usage

Requires the Private Key of an Ethereum address to decrypt data previously encrypted using its public key.

% export PKey=0000000000000000000000000000000000000000000000000000000000000002

% cargo run
Encrypt/Decrypt text & files using ETH keypairs

Usage: EthCrypt <COMMAND>

Commands:
  test          
  pubkey        
  encrypt       
  decrypt       
  encrypt-file  
  decrypt-file  
  help          Print this message or the help of the given subcommand(s)

Options:
  -h, --help     Print help
  -V, --version  Print version

Test

% cargo run test                                                              

Public Key in Hex: 04c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee51ae168fea63dc339a3c58419466ceaeef7f632653266d0e1236431a950cfe52a
encrypted: [4, 37, 3e, ed, d7, 8a, ad, 9b, 95, d5, 66, 4a, 1d, 4b, 75, f, 0, ed, b1, 3b, 72, 2a, d6, af, a3, c9, 5c, 1e, 35, 2a, 10, b5, ae, d3, 91, aa, f7, c9, 40, 8a, 95, 40, f1, 21, cb, e7, 2e, 6c, 1d, 13, 46, 32, 5f, 1d, b9, 33, 2f, 8e, f2, 39, 8b, 9c, da, 29, 43, 50, e1, d4, 4e, 3c, 6e, 87, b7, 1b, 5c, 83, 90, 12, e9, 86, 51, 8a, 90, 73, 2c, bf, 3a, fe, 32, f3, 4, 31, 6c, 9b, 59, 4f, 4, d7, c5, 64, 64, 73, dd, 79, c1, 45, ac]

encrypted: 04373eedd78aad9b95d5664a1d4b750f00edb13b722ad6afa3c95c1e352a10b5aed391aaf7c9408a9540f121cbe72e6c1d1346325f1db9332f8ef2398b9cda294350e1d44e3c6e87b71b5c839012e986518a90732cbf3afe32f304316c9b594f04d7c5646473dd79c145ac
decrypted: helloworld

Public Key

Get Public Key for a Private Key:

% cargo run pubkey   

Public Key in Hex: 04c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee51ae168fea63dc339a3c58419466ceaeef7f632653266d0e1236431a950cfe52a8767a516f3c807a38fc94fad34043c569fcc97ae2944b8c06592a5f84b1b39f611b430140a03af3ca94ab0d738cfc0af6b0bcb44e5ba

Encrypt Message

Supply the Public Key of the desired recipient as the first argument to the encrypt subcommand with the message to encrypt as the last argument.

Below we test encrypting a message using the public key of our own private key.

% cargo run encrypt 04c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee51ae168fea63dc339a3c58419466ceaeef7f632653266d0e1236431a950cfe52a helloworld

Message encrypted: 04aa5f8d18e275f63e9e1c48b138b913e22ad9cf74468d1e49f7a35cd36449c554e5943ecfe7bdc5e420407eeb121e2518d156eb2d787723d3395951f41c4c566cc318561a4324a20e8213cf571ae8642dae095a81221c4b910197a59fbc6ab36f2b0bb6619a78f10acb94

Decrypt Message

To decrypt the encrypted data provide it as an argument to --decrypt

% cargo run decrypt 04aa5f8d18e275f63e9e1c48b138b913e22ad9cf74468d1e49f7a35cd36449c554e5943ecfe7bdc5e420407eeb121e2518d156eb2d787723d3395951f41c4c566cc318561a4324a20e8213cf571ae8642dae095a81221c4b910197a59fbc6ab36f2b0bb6619a78f10acb94

Decrypted message: helloworld

Encrypt File

Similarly for files we need to pass the Public Key as an argument to the encrypt-file subcommand with a file path for the file to encrypt as well as the output file path.

% cargo run encrypt-file 04c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee51ae168fea63dc339a3c58419466ceaeef7f632653266d0e1236431a950cfe52a test123 test123.enc

File encrypted successfully and saved to test123.enc

Decrypt File

% cargo run decrypt-file test123.enc test123.out
Decryption complete. Decrypted data written to: test123.out
% cat test123.out 
test