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Add anonymous-credentials lib/cxx for Web Discovery
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# Copyright (c) 2024 The Brave Authors. All rights reserved. | ||
# This Source Code Form is subject to the terms of the Mozilla Public | ||
# License, v. 2.0. If a copy of the MPL was not distributed with this file, | ||
# You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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static_library("browser") { | ||
deps = [ "anonymous_credentials/rs/cxx:rust_lib" ] | ||
} |
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components/web_discovery/browser/anonymous_credentials/rs/.gitignore
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target | ||
example/main | ||
Cargo.lock |
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components/web_discovery/browser/anonymous_credentials/rs/cxx/BUILD.gn
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# Copyright (c) 2024 The Brave Authors. All rights reserved. | ||
# This Source Code Form is subject to the terms of the Mozilla Public | ||
# License, v. 2.0. If a copy of the MPL was not distributed with this file, | ||
# You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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import("//build/rust/rust_static_library.gni") | ||
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rust_static_library("rust_lib") { | ||
crate_name = "anonymous_credentials_cxx" | ||
crate_root = "src/lib.rs" | ||
allow_unsafe = true | ||
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edition = "2021" | ||
sources = [ "src/lib.rs" ] | ||
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visibility = [ "//brave/components/web_discovery/browser:*" ] | ||
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cxx_bindings = [ "src/lib.rs" ] | ||
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deps = [ "//brave/components/web_discovery/browser/anonymous_credentials/rs/lib:rust_lib" ] | ||
} |
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components/web_discovery/browser/anonymous_credentials/rs/cxx/Cargo.toml
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[package] | ||
name = "anonymous-credentials-cxx" | ||
version = "0.1.0" | ||
edition = "2021" | ||
license = "MPL-2.0" | ||
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[dependencies] | ||
anonymous-credentials = { version = "0.1", path = "../lib" } | ||
cxx = "1" | ||
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[lib] | ||
name = "anonymous_credentials_cxx" | ||
crate-type = ["rlib"] |
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components/web_discovery/browser/anonymous_credentials/rs/cxx/src/lib.rs
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/* Copyright (c) 2024 The Brave Authors. All rights reserved. | ||
* This Source Code Form is subject to the terms of the Mozilla Public | ||
* License, v. 2.0. If a copy of the MPL was not distributed with this file, | ||
* You can obtain one at https://mozilla.org/MPL/2.0/. */ | ||
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use anonymous_credentials::{ | ||
CredentialBIG as InternalCredentialBIG, CredentialManager as InternalCredentialManager, | ||
GroupPublicKey as InternalGroupPublicKey, JoinResponse as InternalJoinResponse, Result, | ||
UserCredentials as InternalUserCredentials, | ||
}; | ||
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#[cxx::bridge(namespace = "anonymous_credentials")] | ||
mod ffi { | ||
struct StartJoinResult { | ||
gsk: Vec<u8>, | ||
join_request: Vec<u8>, | ||
} | ||
struct VecU8Result { | ||
data: Vec<u8>, | ||
error_message: String, | ||
} | ||
struct GroupPublicKeyResult { | ||
value: Box<GroupPublicKey>, | ||
error_message: String, | ||
} | ||
struct CredentialBIGResult { | ||
value: Box<CredentialBIG>, | ||
error_message: String, | ||
} | ||
struct JoinResponseResult { | ||
value: Box<JoinResponse>, | ||
error_message: String, | ||
} | ||
struct UserCredentialsResult { | ||
value: Box<UserCredentials>, | ||
error_message: String, | ||
} | ||
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extern "Rust" { | ||
type CredentialManager; | ||
type GroupPublicKey; | ||
type CredentialBIG; | ||
type JoinResponse; | ||
type UserCredentials; | ||
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fn load_group_public_key(data: &[u8]) -> GroupPublicKeyResult; | ||
fn load_credential_big(data: &[u8]) -> CredentialBIGResult; | ||
fn load_join_response(data: &[u8]) -> JoinResponseResult; | ||
fn load_user_credentials(data: &[u8]) -> UserCredentialsResult; | ||
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fn new_credential_manager() -> Box<CredentialManager>; | ||
fn new_credential_manager_with_fixed_seed() -> Box<CredentialManager>; | ||
fn start_join(self: &mut CredentialManager, challenge: &[u8]) -> StartJoinResult; | ||
fn finish_join( | ||
self: &mut CredentialManager, | ||
public_key: &GroupPublicKey, | ||
gsk: &CredentialBIG, | ||
join_resp: Box<JoinResponse>, | ||
) -> VecU8Result; | ||
fn set_gsk_and_credentials( | ||
self: &mut CredentialManager, | ||
gsk: Box<CredentialBIG>, | ||
credentials: Box<UserCredentials>, | ||
); | ||
fn sign(self: &mut CredentialManager, msg: &[u8], basename: &[u8]) -> VecU8Result; | ||
} | ||
} | ||
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use ffi::*; | ||
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macro_rules! wrapper_with_loader { | ||
($internal_type:ident, $wrapped_type:ident, $result_type:ident, $loader_func_name:ident) => { | ||
#[derive(Default)] | ||
struct $wrapped_type($internal_type); | ||
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fn $loader_func_name(data: &[u8]) -> $result_type { | ||
match $internal_type::try_from(data) { | ||
Ok(value) => $result_type { | ||
value: Box::new($wrapped_type(value)), | ||
error_message: String::new(), | ||
}, | ||
Err(e) => $result_type { | ||
value: Box::new(Default::default()), | ||
error_message: e.to_string(), | ||
}, | ||
} | ||
} | ||
}; | ||
} | ||
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wrapper_with_loader!( | ||
InternalGroupPublicKey, | ||
GroupPublicKey, | ||
GroupPublicKeyResult, | ||
load_group_public_key | ||
); | ||
wrapper_with_loader!( | ||
InternalCredentialBIG, | ||
CredentialBIG, | ||
CredentialBIGResult, | ||
load_credential_big | ||
); | ||
wrapper_with_loader!(InternalJoinResponse, JoinResponse, JoinResponseResult, load_join_response); | ||
wrapper_with_loader!( | ||
InternalUserCredentials, | ||
UserCredentials, | ||
UserCredentialsResult, | ||
load_user_credentials | ||
); | ||
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#[allow(dead_code)] | ||
struct CredentialManager(InternalCredentialManager); | ||
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fn new_credential_manager() -> Box<CredentialManager> { | ||
Box::new(CredentialManager(InternalCredentialManager::new())) | ||
} | ||
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fn new_credential_manager_with_fixed_seed() -> Box<CredentialManager> { | ||
Box::new(CredentialManager(InternalCredentialManager::new_with_seed(&[0u8; 1]))) | ||
} | ||
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impl CredentialManager { | ||
fn start_join(&mut self, challenge: &[u8]) -> StartJoinResult { | ||
let result = self.0.start_join(challenge); | ||
StartJoinResult { | ||
gsk: result.gsk.to_bytes().to_vec(), | ||
join_request: result.join_msg.to_bytes().to_vec(), | ||
} | ||
} | ||
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/// Processes response and returns user credentials | ||
fn finish_join( | ||
&mut self, | ||
public_key: &GroupPublicKey, | ||
gsk: &CredentialBIG, | ||
join_resp: Box<JoinResponse>, | ||
) -> VecU8Result { | ||
|| -> Result<Vec<u8>> { | ||
self.0 | ||
.finish_join(&public_key.0, &gsk.0, join_resp.0) | ||
.map(|creds| creds.to_bytes().to_vec()) | ||
}() | ||
.into() | ||
} | ||
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fn set_gsk_and_credentials( | ||
&mut self, | ||
gsk: Box<CredentialBIG>, | ||
credentials: Box<UserCredentials>, | ||
) { | ||
self.0.set_gsk_and_credentials(gsk.0, credentials.0); | ||
} | ||
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fn sign(&mut self, msg: &[u8], basename: &[u8]) -> VecU8Result { | ||
self.0.sign(msg, basename).map(|sig| sig.to_bytes().to_vec()).into() | ||
} | ||
} | ||
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impl From<Result<Vec<u8>>> for VecU8Result { | ||
fn from(value: Result<Vec<u8>>) -> Self { | ||
match value { | ||
Ok(data) => VecU8Result { data, error_message: String::new() }, | ||
Err(e) => VecU8Result { data: Vec::new(), error_message: e.to_string() }, | ||
} | ||
} | ||
} |
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components/web_discovery/browser/anonymous_credentials/rs/lib/BUILD.gn
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# Copyright (c) 2024 The Brave Authors. All rights reserved. | ||
# This Source Code Form is subject to the terms of the Mozilla Public | ||
# License, v. 2.0. If a copy of the MPL was not distributed with this file, | ||
# You can obtain one at https://mozilla.org/MPL/2.0/. | ||
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import("//build/rust/rust_static_library.gni") | ||
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rust_static_library("rust_lib") { | ||
crate_name = "anonymous_credentials" | ||
crate_root = "src/lib.rs" | ||
sources = [ | ||
"src/data.rs", | ||
"src/join.rs", | ||
"src/lib.rs", | ||
"src/sign.rs", | ||
"src/util.rs", | ||
] | ||
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visibility = [ | ||
"//brave/components/web_discovery/browser/anonymous_credentials/rs/cxx:*", | ||
] | ||
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deps = [ | ||
"//brave/third_party/rust/brave_miracl/v0_1:lib", | ||
"//brave/third_party/rust/lazy_static/v1:lib", | ||
"//brave/third_party/rust/rand/v0_8:lib", | ||
"//brave/third_party/rust/thiserror/v1:lib", | ||
] | ||
} |
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components/web_discovery/browser/anonymous_credentials/rs/lib/Cargo.toml
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[package] | ||
name = "anonymous-credentials" | ||
version = "0.1.4" | ||
edition = "2021" | ||
authors = ["Darnell Andries <dandries@brave.com>"] | ||
description = "Implementation of Direct Anonymous Attestation for the Web Discovery Project" | ||
license = "MPL-2.0" | ||
repository = "https://github.com/brave-experiments/anonymous-credentials-rs" | ||
keywords = ["daa", "credentials", "bn254"] | ||
categories = ["cryptography"] | ||
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[dependencies] | ||
lazy_static = "1.4" | ||
rand = "0.8" | ||
brave-miracl = { version = "0.1", features = ["std"] } | ||
thiserror = "1.0" | ||
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[dev-dependencies] | ||
hex = "0.4" |
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components/web_discovery/browser/anonymous_credentials/rs/lib/README.md
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# anonymous-credentials | ||
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[![Crates.io](https://img.shields.io/crates/v/anonymous-credentials?style=for-the-badge)](https://crates.io/crates/anonymous-credentials) | ||
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Partial implementation of Direct Anonymous Attestation (DAA) for the Web Discovery Project. Only signer functions are available. Performs the same elliptic curve operations as the [original C library](https://github.com/whotracksme/anonymous-credentials). | ||
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bn254 is the only supported curve for this library. | ||
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## License | ||
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This project is licensed under the terms of the [Mozilla Public License 2.0](LICENSE). |
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