Webcryptobox

Webcryptobox provides convenient wrappers around OpenSSL to use WebCrypto compatible cryptography.

It works nicely together with the JavaScript Webcryptobox.

Webcryptobox provides functions for elliptic curve key generation, derivation, import and export as well as AES encryption and decryption.

Webcryptobox comes with both a library and a little command line interface. For the library documentation, see docs.rs/webcryptobox. In the following I describe the CLI usage.

Installation

Clone the project, compile it and use the binary:

sh git clone https://github.com/jo/webcryptobox-js cd webcryptobox-js cargo build --release sudo ln -s `pwd`/target/release/webcryptobox /usr/local/bin/webcryptobox

Usage

Webcryptobox prints out usage information if you do not provide any argument, or if the command is not recognized.

Configuration

Cipher selection is done via environment variables:

CURVE: EC curve name. Defaults to P-521
MODE: AES mode. Defaults to GCM
LENGTH: AES key length in bits. Default is 256

Supported EC Curves

P-256: 256-bit prime field Weierstrass curve. Also known as secp256r1 or prime256v1.
P-384: 384-bit prime field Weierstrass curve. Also known as: secp384r1 or ansip384r1.
P-521: 521-bit prime field Weierstrass curve. Also known as: secp521r1 or ansip521r1.

Supported AES Modes

CBC: Cipher Block Chaining Mode
GCM: Galois/Counter Mode

Supported AES Key Lengths

128
256

`generate-key-pair`

Generate ECDH key and output private key as pem.

sh $ webcryptobox generate-key-pair -----BEGIN PRIVATE KEY----- MIHuAgEAMBAGByqGSM49AgEGBSuBBAAjBIHWMIHTAgEBBEIANqKw4HlT3vUqNQTg YtueEyGDmnm8bOo50Gyq/Y7sSldOZzcPQ+WggGnGd62M6sYit3IZZ+/752OR7+8O td1swiuhgYkDgYYABAGga0QN+HqG9QQwSACVUvts2AV8gbJ+iUKZJWWXQ5BcCoyX RBVi21Ga0ViWQSXyump3H6YrdXq2+2QVKcpQMQmRZQB3P4K6+TqKX4RxXcLKdu0F F7fvYfUXLAxh71MN6HUQDguJ2rwtiM9DfXBu/kqvMURPnb09Cv/ymXN6mU+iavJ9 3A== -----END PRIVATE KEY-----

`generate-key`

Generate AES key, output as hex.

sh $ webcryptobox generate-key 324cc75bdd8185e84c3f2ede3d67017f6fe22ad45dade188b8233dae0f836304

`generate-iv`

Generate an initialization vector, output as hex.

sh $ webcryptobox generate-iv a0e58789d6a4ffa9cec8bbd2

`derive-public-key <filename>`

Derive public key from private key PEM file, output public key pem.

sh $ webcryptobox derive-public-key private-key.pem -----BEGIN PUBLIC KEY----- MIGbMBAGByqGSM49AgEGBSuBBAAjA4GGAAQBoGtEDfh6hvUEMEgAlVL7bNgFfIGy folCmSVll0OQXAqMl0QVYttRmtFYlkEl8rpqdx+mK3V6tvtkFSnKUDEJkWUAdz+C uvk6il+EcV3CynbtBRe372H1FywMYe9TDeh1EA4Lidq8LYjPQ31wbv5KrzFET529 PQr/8plzeplPomryfdw= -----END PUBLIC KEY-----

`sha1-fingerprint <filename>`

Calculate SHA-1 fingerprint from private or public key pem file, output hex. Works by hashing the DER contents of the public key part.

sh $ webcryptobox sha1-fingerprint private-key.pem e635c9976397b68fcc5a3e872fad6730c86e945b

`sha256-fingerprint <filename>`

Calculate SHA-256 fingerprint from private or public key pem file, output hex. Works by hashing the DER contents of the public key part.

sh $ webcryptobox sha256-fingerprint private-key.pem bfeb4a6ea6c4be9117800516ebb4ca9527f106a3498e3684ee4dc291470752aa

`derive-key <private-key> <peer-key>`

derive AES key from private and public key files as pem, output hex.

sh $ webcryptobox derive-key private-key.pem their-public-key.pem 0028ca6b01e9b6293692217efe690bcc2e6537e18cbf3cf7e238adf99f2fe392

`encrypt <key> <iv>`

reads message from STDIN and key and iv as hex args, encrypts message and prints out as base64.

sh $ echo "a secret message" \ | webcryptobox encrypt \ 324cc75bdd8185e84c3f2ede3d67017f6fe22ad45dade188b8233dae0f836304 \ a0e58789d6a4ffa9cec8bbd2 yMQpXTpEkXn9qcav4YJnudO3OB73ywKRnKjzNhckh3Pw

`decrypt <key> <iv>`

reads encrypted message in base64 format from STDIN and key and iv as hex args and prints out decrypted message.

sh $ echo -n "yMQpXTpEkXn9qcav4YJnudO3OB73ywKRnKjzNhckh3Pw" \ | webcryptobox decrypt \ 324cc75bdd8185e84c3f2ede3d67017f6fe22ad45dade188b8233dae0f836304 \ a0e58789d6a4ffa9cec8bbd2 a secret message

`derive-and-encrypt <private-key> <peer-key> <iv>`

reads message from STDIN and private and public key files as pem and iv as hex and encrypts message and prints out as base64.

sh $ echo "a secret message" \ | webcryptobox derive-and-encrypt \ my-private-key.pem \ their-public-key.pem \ b3b7013cdd605017fc1a4010 fBAXWxsdrctjXyceuuAfZMFWb6hLjFGOZAngYlbDTaq6

`derive-and-decrypt <private-key> <peer-key> <iv>`

reads encrypted message in base64 format from STDIN, private and public key files as pem and iv as hex and prints out decrypted message.

sh $ echo -n "fBAXWxsdrctjXyceuuAfZMFWb6hLjFGOZAngYlbDTaq6" \ | webcryptobox derive-and-decrypt \ their-private-key.pem \ my-public-key.pem \ b3b7013cdd605017fc1a4010 a secret message

Test

There's a test suite which ensures the lib works as expected. Run it with cargo: sh cargo test

License

This package is licensed under the Apache 2.0 License.