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‎Cargo.toml‎

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[package]
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name = "bc-shamir"
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version = "0.5.0"
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version = "0.6.0"
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edition = "2021"
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description = "Shamir's Secret Sharing (SSS) for Rust."
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authors = ["Blockchain Commons"]
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repository = "https://github.com/BlockchainCommons/bc-shamir-rust"
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readme = "README.md"
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license = "BSD-2-Clause-Patent"
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documentation = "https://docs.rs/bc-shamir"
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keywords = ["cryptography"] # Up to five
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categories = ["cryptography"] # https://crates.io/category_slugs
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keywords = ["cryptography"] # Up to five
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categories = ["cryptography"] # https://crates.io/category_slugs
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[dependencies]
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bc-rand = "^0.2.0"
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bc-crypto = "^0.6.0"
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bc-rand = "^0.3.0"
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bc-crypto = "^0.7.0"
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thiserror = "^1.0.48"
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‎README.md‎

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## Introduction
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This is a pure-Rust implementation of [Shamir's Secret Sharing (SSS)](https://en.wikipedia.org/wiki/Shamir%27s_secret_sharing) is a cryptographic technique in which a *secret* is divided into parts, called *shares*, in such a way that a *threshold* of several shares are needed to reconstruct the secret. The shares are distributed in a way that makes it impossible for an attacker to know anything about the secret without having a threshold of shares. If the number of shares is less than the threshold, then no information about the secret is revealed.
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This is a pure-Rust implementation of [Shamir's Secret Sharing (SSS)](https://en.wikipedia.org/wiki/Shamir%27s_secret_sharing) is a cryptographic technique in which a _secret_ is divided into parts, called _shares_, in such a way that a _threshold_ of several shares are needed to reconstruct the secret. The shares are distributed in a way that makes it impossible for an attacker to know anything about the secret without having a threshold of shares. If the number of shares is less than the threshold, then no information about the secret is revealed.
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## Getting Started
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```toml
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[dependencies]
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bc-shamir = "0.5.0"
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bc-shamir = "0.6.0"
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```
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## Related Projects
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The primary client of this library is [sskr](https://crates.io/crates/sskr), which implements [Sharded Secret Key Reconstruction (SSKR)](https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-011-sskr.md)
@@ -59,10 +60,10 @@ If your company requires support to use our projects, please feel free to contac
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The following people directly contributed to this repository. You can add your name here by getting involved. The first step is learning how to contribute from our [CONTRIBUTING.md](./CONTRIBUTING.md) documentation.
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| Name | Role | Github | Email | GPG Fingerprint |
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| ----------------- | ------------------- | ------------------------------------------------- | ------------------------------------- | -------------------------------------------------- |
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| Christopher Allen | Principal Architect | [@ChristopherA](https://github.com/ChristopherA) | \<[email protected]\> | FDFE 14A5 4ECB 30FC 5D22 74EF F8D3 6C91 3574 05ED |
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| Wolf McNally | Lead Researcher/Engineer | [@WolfMcNally](https://github.com/wolfmcnally) | \<[email protected]\> | 9436 52EE 3844 1760 C3DC  3536 4B6C 2FCF 8947 80AE |
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| Name | Role | Github | Email | GPG Fingerprint |
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| ----------------- | ------------------------ | ------------------------------------------------ | ------------------------------------- | -------------------------------------------------- |
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| Christopher Allen | Principal Architect | [@ChristopherA](https://github.com/ChristopherA) | \<[email protected]\> | FDFE 14A5 4ECB 30FC 5D22 74EF F8D3 6C91 3574 05ED |
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| Wolf McNally | Lead Researcher/Engineer | [@WolfMcNally](https://github.com/wolfmcnally) | \<[email protected]\> | 9436 52EE 3844 1760 C3DC  3536 4B6C 2FCF 8947 80AE |
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## Responsible Disclosure
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The following keys may be used to communicate sensitive information to developers:
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| Name | Fingerprint |
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| ----------------- | -------------------------------------------------- |
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| Christopher Allen | FDFE 14A5 4ECB 30FC 5D22 74EF F8D3 6C91 3574 05ED |
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| Name | Fingerprint |
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| ----------------- | ------------------------------------------------- |
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| Christopher Allen | FDFE 14A5 4ECB 30FC 5D22 74EF F8D3 6C91 3574 05ED |
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You can import a key by running the following command with that individual’s fingerprint: `gpg --recv-keys "<fingerprint>"` Ensure that you put quotes around fingerprints that contain spaces.

‎src/lib.rs‎

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#![doc(html_root_url = "https://docs.rs/bc-shamir/0.5.0")]
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#![doc(html_root_url = "https://docs.rs/bc-shamir/0.6.0")]
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#![warn(rust_2018_idioms)]
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//! ## Introduction
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//!
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//! ```toml
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//! [dependencies]
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//! bc-shamir = "0.5.0"
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//! bc-shamir = "0.6.0"
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//!```
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//!
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//! ## Usage
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//! # }
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//! ```
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/// The minimum length of a secret.
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pub const MIN_SECRET_LEN: usize = 16;
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pub use error::Error;
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mod shamir;
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pub use shamir::{split_secret, recover_secret};
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pub use shamir::{recover_secret, split_secret};
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#[cfg(test)]
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mod tests {
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assert_eq!(shares[4], hex!("1aa7fe3199bc5092ef3816b074cabdf2"));
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let recovered_share_indexes = vec![1, 2, 4];
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let recovered_shares = recovered_share_indexes.iter().map(|index| shares[*index].clone()).collect::<Vec<_>>();
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let recovered_shares = recovered_share_indexes
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.iter()
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.map(|index| shares[*index].clone())
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.collect::<Vec<_>>();
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let recovered_secret = recover_secret(&recovered_share_indexes, &recovered_shares).unwrap();
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assert_eq!(recovered_secret, secret);
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}
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let shares = split_secret(2, 7, &secret, &mut rng).unwrap();
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assert_eq!(shares.len(), 7);
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//shares.iter().enumerate().for_each(|(index, share)| println!("{}: {}", index, hex::encode(share)));
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assert_eq!(shares[0], hex!("2dcd14c2252dc8489af3985030e74d5a48e8eff1478ab86e65b43869bf39d556"));
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assert_eq!(shares[1], hex!("a1dfdd798388aada635b9974472b4fc59a32ae520c42c9f6a0af70149b882487"));
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assert_eq!(shares[2], hex!("2ee99daf727c0c7773b89a18de64497ff7476dacd1015a45f482a893f7402cef"));
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assert_eq!(shares[3], hex!("a2fb5414d4d96ee58a109b3ca9a84be0259d2c0f9ac92bdd3199e0eed3f1dd3e"));
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assert_eq!(shares[4], hex!("2b851d188b8f5b3653659cc0f7fa45102dadf04b708767385cd803862fcb3c3f"));
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assert_eq!(shares[5], hex!("a797d4a32d2a39a4aacd9de48036478fff77b1e83b4f16a099c34bfb0b7acdee"));
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assert_eq!(shares[6], hex!("28a19475dcde9f09ba2e9e881979413592027216e60c8513cdee937c67b2c586"));
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assert_eq!(
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shares[0],
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hex!("2dcd14c2252dc8489af3985030e74d5a48e8eff1478ab86e65b43869bf39d556")
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);
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assert_eq!(
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shares[1],
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hex!("a1dfdd798388aada635b9974472b4fc59a32ae520c42c9f6a0af70149b882487")
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);
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assert_eq!(
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shares[2],
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hex!("2ee99daf727c0c7773b89a18de64497ff7476dacd1015a45f482a893f7402cef")
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);
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assert_eq!(
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shares[3],
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hex!("a2fb5414d4d96ee58a109b3ca9a84be0259d2c0f9ac92bdd3199e0eed3f1dd3e")
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);
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assert_eq!(
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shares[4],
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hex!("2b851d188b8f5b3653659cc0f7fa45102dadf04b708767385cd803862fcb3c3f")
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);
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assert_eq!(
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shares[5],
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hex!("a797d4a32d2a39a4aacd9de48036478fff77b1e83b4f16a099c34bfb0b7acdee")
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);
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assert_eq!(
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shares[6],
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hex!("28a19475dcde9f09ba2e9e881979413592027216e60c8513cdee937c67b2c586")
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);
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let recovered_share_indexes = vec![3, 4];
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let recovered_shares = recovered_share_indexes.iter().map(|index| shares[*index].clone()).collect::<Vec<_>>();
183+
let recovered_shares = recovered_share_indexes
184+
.iter()
185+
.map(|index| shares[*index].clone())
186+
.collect::<Vec<_>>();
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let recovered_secret = recover_secret(&recovered_share_indexes, &recovered_shares).unwrap();
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assert_eq!(recovered_secret, secret);
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}

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