crypto: Add initial Sas scaffolding.

This commit is contained in:
Damir Jelić 2020-07-14 17:04:08 +02:00
parent 51012e632e
commit 1691a26163
4 changed files with 129 additions and 1 deletions

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@ -15,7 +15,7 @@ instant = { version = "0.1.4", features = ["wasm-bindgen", "now"] }
js_int = "0.1.8" js_int = "0.1.8"
[dependencies.ruma] [dependencies.ruma]
git = "https://github.com/ruma/ruma" path = "/home/poljar/werk/priv/ruma/ruma"
features = ["client-api"] features = ["client-api"]
rev = "c19bcaab" rev = "c19bcaab"

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@ -32,6 +32,7 @@ mod machine;
mod memory_stores; mod memory_stores;
mod olm; mod olm;
mod store; mod store;
mod verification;
pub use device::{Device, TrustState}; pub use device::{Device, TrustState};
pub use error::{MegolmError, OlmError}; pub use error::{MegolmError, OlmError};

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@ -0,0 +1,2 @@
#[allow(dead_code)]
mod sas;

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@ -0,0 +1,125 @@
use crate::Device;
use matrix_sdk_common::events::key::verification::{
start::{StartEvent, StartEventContent},
accept::AcceptEvent,
HashAlgorithm, KeyAgreementProtocol, MessageAuthenticationCode, ShortAuthenticationString,
VerificationMethod,
};
use matrix_sdk_common::identifiers::{DeviceId, UserId};
use matrix_sdk_common::uuid::Uuid;
struct SasIds {
own_user_id: UserId,
own_device_id: DeviceId,
other_device: Device,
}
struct ProtocolDefinitions {
key_agreement_protocols: Vec<KeyAgreementProtocol>,
hashes: Vec<HashAlgorithm>,
message_auth_codes: Vec<MessageAuthenticationCode>,
short_auth_string: Vec<ShortAuthenticationString>,
}
struct AcceptedProtocols {
method: VerificationMethod,
key_agreement_protocol: KeyAgreementProtocol,
hash: HashAlgorithm,
message_auth_code: MessageAuthenticationCode,
short_auth_string: Vec<ShortAuthenticationString>
}
struct Sas<S> {
ids: SasIds,
verification_flow_id: Uuid,
protocol_definitions: ProtocolDefinitions,
state: S,
}
impl Sas<Created> {
fn new(own_user_id: UserId, own_device_id: DeviceId, other_device: Device) -> Sas<Created> {
Sas {
ids: SasIds {
own_user_id,
own_device_id,
other_device,
},
verification_flow_id: Uuid::new_v4(),
protocol_definitions: ProtocolDefinitions {
short_auth_string: vec![
ShortAuthenticationString::Decimal,
ShortAuthenticationString::Emoji,
],
key_agreement_protocols: vec![KeyAgreementProtocol::Curve25519],
message_auth_codes: vec![MessageAuthenticationCode::HkdfHmacSha256],
hashes: vec![HashAlgorithm::Sha256],
},
state: Created {},
}
}
fn into_accepted(self, event: &AcceptEvent) -> Sas<Accepted> {
let content = &event.content;
Sas {
ids: self.ids,
verification_flow_id: self.verification_flow_id,
protocol_definitions: self.protocol_definitions,
state: Accepted {
commitment: content.commitment.clone(),
accepted_protocols: AcceptedProtocols {
method: content.method,
hash: content.hash,
key_agreement_protocol: content.key_agreement_protocol,
message_auth_code: content.message_authentication_code,
short_auth_string: content.short_authentication_string.clone(),
}
},
}
}
}
struct Created {}
struct Started {}
impl Sas<Started> {
fn from_start_event(
own_user_id: UserId,
own_device_id: DeviceId,
other_device: Device,
event: &StartEvent,
) -> Sas<Started> {
let content = if let StartEventContent::MSasV1(content) = &event.content {
content
} else {
panic!("Invalid sas version")
};
Sas {
ids: SasIds {
own_user_id,
own_device_id,
other_device,
},
verification_flow_id: Uuid::new_v4(),
protocol_definitions: ProtocolDefinitions {
short_auth_string: content.short_authentication_string.clone(),
key_agreement_protocols: content.key_agreement_protocols.clone(),
message_auth_codes: content.message_authentication_codes.clone(),
hashes: content.hashes.clone(),
},
state: Started {},
}
}
}
struct Accepted {
accepted_protocols: AcceptedProtocols,
commitment: String,
}