4 releases
0.0.4 | Dec 1, 2023 |
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0.0.3 | Oct 2, 2023 |
0.0.2 | Feb 25, 2022 |
0.0.1 | Sep 24, 2020 |
#1029 in Cryptography
260KB
3K
SLoC
Umbral-rs
umbral-rs
is the implementation of the Umbral threshold proxy re-encryption scheme, built with Rust taking as reference the Python version createdby the Umbral authors.
Umbral consists of a Proxy Re-Encryption scheme, in which a data holder can delegate decryption rights to a data consumer for any encrypted text intended for him/her. It is carried out through a re-encryption process performed by a series of semi-trusted proxies. When a threshold of these proxies participates by performing the re-encryption and creating some shares, the consumer is able to combine these independent re-encryption shares and decrypt the original message using his private key.
Encrypt/Decrypt Example
use umbral_rs::pre::*;
let params = new_standard_params();
let alice = KeyPair::new(¶ms);
let signer = Signer::new(¶ms);
let bob = KeyPair::new(¶ms);
let plaintext = b"Hello, umbral!".to_vec();
let (ciphertext, mut capsule) = encrypt(&alice.public_key(), &plaintext).unwrap();
capsule.set_correctness_keys(&alice.public_key(), &bob.public_key(), &signer.public_key());
let threshold = 2;
let nodes_number = 5;
let kfrags = generate_kfrags(
&alice,
&bob.public_key(),
threshold,
nodes_number,
&signer,
KFragMode::DelegatingAndReceiving,
).unwrap();
for kfrag in kfrags {
let cfrag = reencrypt(&kfrag, &capsule, true, None, true).unwrap();
capsule.attach_cfrag(&cfrag).unwrap();
}
let plaintext_bob = decrypt(ciphertext, &capsule, &bob, true).unwrap();
assert_eq!(plaintext, plaintext_bob);
println!("{:?}", String::from_utf8(plaintext_bob.to_owned()).unwrap());
file documentation
the source code is in the src
folder, the documentation is in the docs
folder. Stated briefly, inside the src/internal
folder there are the following files:
keys.rs
contains theKeyPair
struct, which is used to generate the public and private keys.capsule.rs
contains theCapsule
struct, which is used to encapsulate the ciphertext.kfrag.rs
contains theKFrag
struct, which is used to delegate the re-encryption rights.curve.rs
contains theCurve
struct, which is used to generate the curve parameters.errors.rs
contains theUmbralError
enum, which is used to return the errors.scheme.rs
contains the hashing functions used in the scheme.utils.rs
contains tilities functions such aspoly_eval
used to evaluate a polynomial at a point.
In the src
folder there are the following files:
pre.rs
contains the main functions to use the library, such asencrypt
,decrypt
,reencrypt
,generate_kfrags
, etc.lib.rs
contains theprelude
module, which is used to import the main functions of the library.main.rs
contains themain
function, which is used to run the tests.
Dependencies
~5.5MB
~94K SLoC