A Rust crate to encode and decode secured data (Signatures, Encryption or MACed) in CBOR Object Signing and Encryption (COSE) format, RFC 8152.
This crate uses the rust-openssl and rand for the cryptographic operations and the cbor-codec for the CBOR encoding/decoding.
COSE is a concise binary data format that protects the payload of the message with a set of cryptographic operations.
The COSE RFC 8152 specifies the following 6 types of COSE messages:
The following examples, demonstrate how to encode and decode the basic COSE messages (cose-sign1, cose-encrypt0, cose-mac0), examples of other use cases and cose message types can be found in the respective documentation.
```rust use cose::sign::CoseSign; use cose::keys; use cose::algs; use hex;
fn main() { let msg = b"This is the content.".tovec(); let kid = b"11".tovec();
// cose-key to encode the message
let mut key = keys::CoseKey::new();
key.kty(keys::EC2);
key.alg(algs::ES256);
key.crv(keys::P_256);
key.x(hex::decode("bac5b11cad8f99f9c72b05cf4b9e26d244dc189f745228255a219a86d6a09eff").unwrap());
key.y(hex::decode("20138bf82dc1b6d562be0fa54ab7804a3a64b6d72ccfed6b6fb6ed28bbfc117e").unwrap());
key.d(hex::decode("57c92077664146e876760c9520d054aa93c3afb04e306705db6090308507b4d3").unwrap());
key.key_ops(vec![keys::KEY_OPS_SIGN]);
// Prepare cose-sign1 message
let mut sign1 = CoseSign::new();
sign1.header.alg(algs::ES256, true, false);
sign1.header.kid(kid, true, false);
sign1.payload(msg);
sign1.key(&key).unwrap();
// Generate the signature
sign1.gen_signature(None).unwrap();
// Encode the message with the payload
sign1.encode(true).unwrap();
} ```
```rust use cose::sign::CoseSign; use cose::keys; use cose::algs; use hex;
fn main() { // cose-key to decode the message let mut key = keys::CoseKey::new(); key.kty(keys::EC2); key.alg(algs::ES256); key.crv(keys::P256); key.x(hex::decode("bac5b11cad8f99f9c72b05cf4b9e26d244dc189f745228255a219a86d6a09eff").unwrap()); key.y(hex::decode("20138bf82dc1b6d562be0fa54ab7804a3a64b6d72ccfed6b6fb6ed28bbfc117e").unwrap()); key.d(hex::decode("57c92077664146e876760c9520d054aa93c3afb04e306705db6090308507b4d3").unwrap()); key.keyops(vec![keys::KEYOPSVERIFY]);
// Generate CoseSign struct with the cose-sign1 message to decode
let mut verify = CoseSign::new();
verify.bytes =
hex::decode("d28447a2012604423131a054546869732069732074686520636f6e74656e742e5840dc93ddf7d5aff58131589087eaa65eeffa0baf2e72201ee91c0ca876ec42fdfb2a67dbc6ea1a95d2257cec645cf789808c0a392af045e2bc1bdb6746d80f221b").unwrap();
// Initial decoding
verify.init_decoder(None).unwrap();
// Add key and verify the signature
verify.key(&key).unwrap();
verify.decode(None).unwrap();
} ```
```rust use cose::encrypt::CoseEncrypt; use cose::keys; use cose::algs; use hex;
fn main() { let msg = b"This is the content.".tovec(); let kid = b"secret".tovec();
// Prepare the cose-key
let mut key = keys::CoseKey::new();
key.kty(keys::SYMMETRIC);
key.alg(algs::CHACHA20);
key.k(hex::decode("849b57219dae48de646d07dbb533566e976686457c1491be3a76dcea6c427188").unwrap());
key.key_ops(vec![keys::KEY_OPS_ENCRYPT]);
// Prepare cose-encrypt0 message
let mut enc0 = CoseEncrypt::new();
enc0.header.alg(algs::CHACHA20, true, false);
enc0.header.iv(hex::decode("89f52f65a1c580933b5261a7").unwrap(), true, false);
enc0.payload(msg);
enc0.key(&key).unwrap();
// Generate the ciphertext with no AAD.
enc0.gen_ciphertext(None).unwrap();
// Encode the cose-encrypt0 message with the ciphertext included
enc0.encode(true).unwrap();
}
```
```rust use cose::encrypt::CoseEncrypt; use cose::keys; use cose::algs; use hex;
fn main() { let expectedmsg = b"This is the content.".tovec();
// Prepare the cose-key
let mut key = keys::CoseKey::new();
key.kty(keys::SYMMETRIC);
key.alg(algs::CHACHA20);
key.k(hex::decode("849b57219dae48de646d07dbb533566e976686457c1491be3a76dcea6c427188").unwrap());
key.key_ops(vec![keys::KEY_OPS_DECRYPT]);
// Generate CoseEncrypt struct with the cose-encryt0 message to decode
let mut dec0 = CoseEncrypt::new();
dec0.bytes =
hex::decode("d08352a2011818054c89f52f65a1c580933b5261a7a0582481c32c048134989007b3b5b932811ea410eeab15bd0de5d5ac5be03c84dce8c88871d6e9").unwrap();
// Initial decoding of the message
dec0.init_decoder().unwrap();
// Add cose-key
dec0.key(&key).unwrap();
// Decrypt the cose-encrypt0 message
let msg = dec0.decode(None, None).unwrap();
assert_eq!(msg, expected_msg);
}
```
```rust use cose::mac::CoseMAC; use cose::keys; use cose::algs;
fn main() { let msg = b"This is the content.".to_vec();
// Prepare the cose-key
let mut key = keys::CoseKey::new();
key.kty(keys::SYMMETRIC);
key.alg(algs::AES_MAC_256_128);
key.k(hex::decode("849b57219dae48de646d07dbb533566e976686457c1491be3a76dcea6c427188").unwrap());
key.key_ops(vec![keys::KEY_OPS_MAC]);
// Prepare the cose-mac0 message
let mut mac0 = CoseMAC::new();
mac0.header.alg(algs::AES_MAC_256_128, true, false);
// Add the payload
mac0.payload(msg);
// Add cose-key
mac0.key(&key).unwrap();
// Generate MAC tag without AAD
mac0.gen_tag(None).unwrap();
// Encode the cose-mac0 message with the payload included
mac0.encode(true).unwrap();
} ```
```rust use cose::mac::CoseMAC; use cose::keys; use cose::algs;
fn main() { // Prepare the cose-key let mut key = keys::CoseKey::new(); key.kty(keys::SYMMETRIC); key.alg(algs::AESMAC256128); key.k(hex::decode("849b57219dae48de646d07dbb533566e976686457c1491be3a76dcea6c427188").unwrap()); key.keyops(vec![keys::KEYOPSMAC_VERIFY]);
// Generate CoseMAC struct with the cose-mac0 message to decode
let mut verify = CoseMAC::new();
verify.bytes =
hex::decode("d18444a101181aa054546869732069732074686520636f6e74656e742e50403152cc208c1d501e1dc2a789ae49e4").unwrap();
// Initial decoding of the message
verify.init_decoder().unwrap();
// Add cose-key
verify.key(&key).unwrap();
// Verify the MAC tag of the cose-mac0 message
verify.decode(None, None).unwrap();
} ```
This crate, cose-rust, is licensed by the MIT License.
This crate is under development and it has not been tested yet.