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Add support for COSE for VCs. (#593)
* Update MSRV.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| [package] | ||
| name = "ssi-cose" | ||
| version = "0.1.0" | ||
| edition = "2021" | ||
| authors = ["Spruce Systems, Inc."] | ||
| license = "Apache-2.0" | ||
| description = "CBOR Object Signing and Encryption for the `ssi` library." | ||
| repository = "https://github.com/spruceid/ssi/" | ||
| documentation = "https://docs.rs/ssi-cose/" | ||
|
|
||
| [features] | ||
| default = ["secp256r1"] | ||
| ed25519 = ["ssi-crypto/ed25519"] | ||
| secp256k1 = ["ssi-crypto/secp256k1"] | ||
| secp256r1 = ["ssi-crypto/secp256r1"] | ||
| secp384r1 = ["ssi-crypto/secp384r1"] | ||
|
|
||
| [dependencies] | ||
| ssi-crypto.workspace = true | ||
| ssi-claims-core.workspace = true | ||
| thiserror.workspace = true | ||
| ciborium.workspace = true | ||
| coset = { version = "0.3.8", features = ["std"] } | ||
| serde = { workspace = true, features = ["derive"] } | ||
|
|
||
| [dev-dependencies] | ||
| serde_json.workspace = true | ||
| hex.workspace = true | ||
| async-std = { workspace = true, features = ["attributes"] } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| use std::borrow::Cow; | ||
|
|
||
| use coset::{ | ||
| iana::{self, EnumI64}, | ||
| Algorithm, CoseKey, KeyType, | ||
| }; | ||
| use ssi_crypto::AlgorithmInstance; | ||
|
|
||
| use crate::key::{CoseKeyDecode, EC2_CRV}; | ||
|
|
||
| /// Converts a COSE algorithm into an SSI algorithm instance. | ||
| pub fn instantiate_algorithm(algorithm: &Algorithm) -> Option<AlgorithmInstance> { | ||
| match algorithm { | ||
| Algorithm::Assigned(iana::Algorithm::PS256) => Some(AlgorithmInstance::PS256), | ||
| Algorithm::Assigned(iana::Algorithm::PS384) => Some(AlgorithmInstance::PS384), | ||
| Algorithm::Assigned(iana::Algorithm::PS512) => Some(AlgorithmInstance::PS512), | ||
| Algorithm::Assigned(iana::Algorithm::EdDSA) => Some(AlgorithmInstance::EdDSA), | ||
| Algorithm::Assigned(iana::Algorithm::ES256K) => Some(AlgorithmInstance::ES256K), | ||
| Algorithm::Assigned(iana::Algorithm::ES256) => Some(AlgorithmInstance::ES256), | ||
| Algorithm::Assigned(iana::Algorithm::ES384) => Some(AlgorithmInstance::ES384), | ||
| _ => None, | ||
| } | ||
| } | ||
|
|
||
| /// Computes a proper display name for the give COSE algorithm. | ||
| pub fn algorithm_name(algorithm: &Algorithm) -> String { | ||
| match algorithm { | ||
| Algorithm::Assigned(iana::Algorithm::PS256) => "PS256".to_owned(), | ||
| Algorithm::Assigned(iana::Algorithm::PS384) => "PS384".to_owned(), | ||
| Algorithm::Assigned(iana::Algorithm::PS512) => "PS512".to_owned(), | ||
| Algorithm::Assigned(iana::Algorithm::EdDSA) => "EdDSA".to_owned(), | ||
| Algorithm::Assigned(iana::Algorithm::ES256K) => "ES256K".to_owned(), | ||
| Algorithm::Assigned(iana::Algorithm::ES256) => "ES256".to_owned(), | ||
| Algorithm::Assigned(iana::Algorithm::ES384) => "ES384".to_owned(), | ||
| Algorithm::Assigned(i) => format!("assigned({})", i.to_i64()), | ||
| Algorithm::PrivateUse(i) => format!("private_use({i})"), | ||
| Algorithm::Text(text) => text.to_owned(), | ||
| } | ||
| } | ||
|
|
||
| /// Returns the preferred signature algorithm for the give COSE key. | ||
| pub fn preferred_algorithm(key: &CoseKey) -> Option<Cow<Algorithm>> { | ||
| key.alg | ||
| .as_ref() | ||
| .map(Cow::Borrowed) | ||
| .or_else(|| match key.kty { | ||
| KeyType::Assigned(iana::KeyType::RSA) => { | ||
| Some(Cow::Owned(Algorithm::Assigned(iana::Algorithm::PS256))) | ||
| } | ||
| KeyType::Assigned(iana::KeyType::OKP) => { | ||
| let crv = key | ||
| .parse_required_param(&EC2_CRV, |v| { | ||
| v.as_integer().and_then(|i| i64::try_from(i).ok()) | ||
| }) | ||
| .ok()?; | ||
|
|
||
| match iana::EllipticCurve::from_i64(crv)? { | ||
| iana::EllipticCurve::Ed25519 => { | ||
| Some(Cow::Owned(Algorithm::Assigned(iana::Algorithm::EdDSA))) | ||
| } | ||
| _ => None, | ||
| } | ||
| } | ||
| KeyType::Assigned(iana::KeyType::EC2) => { | ||
| let crv = key | ||
| .parse_required_param(&EC2_CRV, |v| { | ||
| v.as_integer().and_then(|i| i64::try_from(i).ok()) | ||
| }) | ||
| .ok()?; | ||
|
|
||
| match iana::EllipticCurve::from_i64(crv)? { | ||
| iana::EllipticCurve::Secp256k1 => { | ||
| Some(Cow::Owned(Algorithm::Assigned(iana::Algorithm::ES256K))) | ||
| } | ||
| iana::EllipticCurve::P_256 => { | ||
| Some(Cow::Owned(Algorithm::Assigned(iana::Algorithm::ES256))) | ||
| } | ||
| iana::EllipticCurve::P_384 => { | ||
| Some(Cow::Owned(Algorithm::Assigned(iana::Algorithm::ES384))) | ||
| } | ||
| _ => None, | ||
| } | ||
| } | ||
| _ => None, | ||
| }) | ||
| } |
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