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use crate::{
BbsCredential, BlsSecretKey, CredentialAttribute, CredentialFragment1, CredentialFragment2,
CredentialOffer, CredentialPresentation, CredentialRequest, CredentialSchema, EntityError,
EntityIdentifier, OfferId, PresentationManifest, ProfileIdentifier, ProofBytes, ProofRequestId,
SigningPublicKey, TrustPolicy,
};
use core::convert::TryFrom;
use core::fmt::{Display, Formatter};
use ockam_core::{hex, Address, Error, Result, Route};
use rand::distributions::Standard;
use rand::prelude::Distribution;
use rand::Rng;
use serde::{Deserialize, Serialize};
use serde_big_array::big_array;
big_array! { BigArray; }
pub trait CredentialIssuer {
fn get_signing_key(&mut self) -> Result<BlsSecretKey>;
fn get_signing_public_key(&mut self) -> Result<SigningPublicKey>;
fn create_offer(&mut self, schema: &CredentialSchema) -> Result<CredentialOffer>;
fn create_proof_of_possession(&mut self) -> Result<ProofBytes>;
fn sign_credential(
&mut self,
schema: &CredentialSchema,
attributes: &[CredentialAttribute],
) -> Result<BbsCredential>;
fn sign_credential_request(
&mut self,
request: &CredentialRequest,
schema: &CredentialSchema,
attributes: &[(String, CredentialAttribute)],
offer_id: OfferId,
) -> Result<CredentialFragment2>;
}
pub trait CredentialHolder {
fn accept_credential_offer(
&mut self,
offer: &CredentialOffer,
signing_public_key: SigningPublicKey,
) -> Result<(CredentialRequest, CredentialFragment1)>;
fn combine_credential_fragments(
&mut self,
credential_fragment1: CredentialFragment1,
credential_fragment2: CredentialFragment2,
) -> Result<BbsCredential>;
fn is_valid_credential(
&mut self,
credential: &BbsCredential,
verifier_key: SigningPublicKey,
) -> Result<bool>;
fn present_credentials(
&mut self,
credential: &[BbsCredential],
presentation_manifests: &[PresentationManifest],
proof_request_id: ProofRequestId,
) -> Result<Vec<CredentialPresentation>>;
}
pub trait CredentialVerifier {
fn create_proof_request_id(&mut self) -> Result<ProofRequestId>;
fn verify_proof_of_possession(
&mut self,
issuer_vk: SigningPublicKey,
proof: ProofBytes,
) -> Result<bool>;
fn verify_credential_presentations(
&mut self,
presentations: &[CredentialPresentation],
presentation_manifests: &[PresentationManifest],
proof_request_id: ProofRequestId,
) -> Result<bool>;
}
#[derive(Clone, Debug, Eq, PartialEq, Hash, Serialize, Deserialize, Default)]
pub struct CredentialIdentifier(String);
impl Distribution<CredentialIdentifier> for Standard {
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> CredentialIdentifier {
let id: [u8; 16] = rng.gen();
CredentialIdentifier(hex::encode(id))
}
}
impl CredentialIdentifier {
pub const PREFIX: &'static str = "C";
}
impl Display for CredentialIdentifier {
fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
let str: String = self.clone().into();
write!(f, "{}", &str)
}
}
impl Into<String> for CredentialIdentifier {
fn into(self) -> String {
format!("{}{}", Self::PREFIX, &self.0)
}
}
impl TryFrom<&str> for CredentialIdentifier {
type Error = Error;
fn try_from(value: &str) -> Result<Self> {
if let Some(str) = value.strip_prefix(Self::PREFIX) {
Ok(Self(str.into()))
} else {
Err(EntityError::InvalidProfileId.into())
}
}
}
impl TryFrom<String> for CredentialIdentifier {
type Error = Error;
fn try_from(value: String) -> Result<Self> {
Self::try_from(value.as_str())
}
}
#[derive(Clone, Eq, PartialEq, Debug, Serialize, Deserialize)]
pub struct Credential {
id: CredentialIdentifier,
issuer_id: EntityIdentifier,
type_id: String,
}
impl Credential {
pub fn new(id: CredentialIdentifier, issuer_id: EntityIdentifier, type_id: String) -> Self {
Credential {
id,
issuer_id,
type_id,
}
}
}
impl Credential {
pub fn id(&self) -> &CredentialIdentifier {
&self.id
}
pub fn issuer_id(&self) -> &EntityIdentifier {
&self.issuer_id
}
pub fn type_id(&self) -> &str {
&self.type_id
}
}
#[derive(Clone, Serialize, Deserialize)]
pub struct EntityCredential {
credential: Credential,
bbs_credential: BbsCredential,
#[serde(with = "BigArray")]
issuer_pubkey: SigningPublicKey,
schema: CredentialSchema,
}
impl EntityCredential {
pub fn credential(&self) -> &Credential {
&self.credential
}
pub fn bbs_credential(&self) -> &BbsCredential {
&self.bbs_credential
}
pub fn issuer_pubkey(&self) -> SigningPublicKey {
self.issuer_pubkey
}
pub fn schema(&self) -> &CredentialSchema {
&self.schema
}
}
impl EntityCredential {
pub fn new(
credential: Credential,
bbs_credential: BbsCredential,
issuer_pubkey: SigningPublicKey,
schema: CredentialSchema,
) -> Self {
EntityCredential {
credential,
bbs_credential,
issuer_pubkey,
schema,
}
}
}
pub trait CredentialProtocol {
fn create_credential_issuance_listener(
&mut self,
address: impl Into<Address> + Send,
schema: CredentialSchema,
trust_policy: impl TrustPolicy,
) -> Result<()>;
fn acquire_credential(
&mut self,
issuer_route: Route,
issuer_id: &ProfileIdentifier,
schema: CredentialSchema,
values: Vec<CredentialAttribute>,
) -> Result<Credential>;
fn present_credential(
&mut self,
worker_route: Route,
credential: Credential,
reveal_attributes: Vec<String>,
) -> Result<()>;
fn verify_credential(
&mut self,
address: impl Into<Address> + Send,
issuer_id: &ProfileIdentifier,
schema: CredentialSchema,
attributes_values: Vec<CredentialAttribute>,
) -> Result<bool>;
}