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builders.rs
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builders.rs
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use super::*;
#[wasm_bindgen]
#[derive(Clone, Debug)]
pub struct COSESign1Builder {
headers: Headers,
payload: Vec<u8>,
external_aad: Option<Vec<u8>>,
is_payload_external: bool,
hashed: bool,
}
#[wasm_bindgen]
impl COSESign1Builder {
pub fn new(headers: &Headers, payload: Vec<u8>, is_payload_external: bool) -> Self {
let mut all_headers = headers.clone();
all_headers.unprotected.set_header(
&Label::new_text(String::from("hashed")),
&CBORValue::new_special(&CBORSpecial::new_bool(false))).unwrap();
Self {
headers: all_headers,
payload,
external_aad: None,
is_payload_external,
hashed: false,
}
}
pub fn hash_payload(&mut self) {
if !self.hashed {
self.hashed = true;
let _ = self.headers.unprotected.set_header(
&Label::new_text(String::from("hashed")),
&CBORValue::new_special(&CBORSpecial::new_bool(true)));
self.payload = crypto::blake2b224(self.payload.as_ref()).to_vec();
}
}
pub fn set_external_aad(&mut self, external_aad: Vec<u8>) {
self.external_aad = Some(external_aad);
}
pub fn make_data_to_sign(&self) -> SigStructure {
SigStructure::new(
SigContext::Signature1,
&self.headers.protected,
self.external_aad.clone().unwrap_or(vec![]),
self.payload.clone())
}
pub fn build(&self, signed_sig_structure: Vec<u8>) -> COSESign1 {
COSESign1::new(
&self.headers,
match self.is_payload_external {
true => None,
false => Some(self.payload.clone()),
},
signed_sig_structure
)
}
}
#[wasm_bindgen]
#[derive(Clone, Debug)]
pub struct COSESignBuilder {
headers: Headers,
payload: Vec<u8>,
external_aad: Option<Vec<u8>>,
is_payload_external: bool,
hashed: bool,
}
#[wasm_bindgen]
impl COSESignBuilder {
pub fn new(headers: &Headers, payload: Vec<u8>, is_payload_external: bool) -> Self {
Self {
headers: headers.clone(),
payload,
external_aad: None,
is_payload_external,
hashed: false,
}
}
pub fn hash_payload(&mut self) {
if !self.hashed {
self.hashed = true;
self.payload = crypto::blake2b224(self.payload.as_ref()).to_vec();
}
}
pub fn set_external_aad(&mut self, external_aad: Vec<u8>) {
self.external_aad = Some(external_aad);
}
pub fn make_data_to_sign(&self) -> SigStructure {
SigStructure::new(
SigContext::Signature,
&self.headers.protected,
self.external_aad.clone().unwrap_or(vec![]),
self.payload.clone())
}
pub fn build(&self, signed_sig_structure: &COSESignatures) -> COSESign {
COSESign::new(
&self.headers,
match self.is_payload_external {
true => None,
false => Some(self.payload.clone())
},
signed_sig_structure)
}
}
// TODO: copy the COSESign(1) builders for COSEEncrypt(1) if this seems like a good approach
label_enum!(AlgorithmId {
/// EdDSA (Pure EdDSA, not HashedEdDSA) - the algorithm used for Cardano addresses
EdDSA = -8,
/// ChaCha20/Poly1305 w/ 256-bit key, 128-bit tag
ChaCha20Poly1305 = 24,
});
label_enum!(KeyType {
/// octet key pair
OKP = 1,
/// 2-coord EC
EC2 = 2,
Symmetric = 4,
});
label_enum!(ECKey {
// EC identifier
CRV = -1,
// x coord (OKP) / pubkey (EC2)
X = -2,
// y coord (only for EC2 - not present in OKP)
Y = -3,
// private key (optional)
D = -4,
});
label_enum!(CurveType {
P256 = 1,
P384 = 2,
P521 = 3,
X25519 = 4,
X448 = 5,
// the EdDSA variant used for cardano addresses
Ed25519 = 6,
Ed448 = 7,
});
label_enum!(KeyOperation {
// The key is used to create signatures. Requires private key fields
Sign = 1,
// The key is used for verification of signatures.
Verify = 2,
// The key is used for key transport encryption.
Encrypt = 3,
// The key is used for key transport decryption. Requires private key fields.
Decrypt = 4,
// The key is used for key wrap encryption.
WrapKey = 5,
// The key is used for key wrap decryption. Requires private key fields.
UnwrapKey = 6,
// The key is used for deriving keys. Requires private key fields
DeriveKey = 7,
// The key is used for deriving bits not to be used as a key. Requires private key fields
DeriveBits = 8,
});
#[wasm_bindgen]
#[derive(Clone, Debug)]
pub struct EdDSA25519Key {
pubkey_bytes: Vec<u8>,
prvkey_bytes: Option<Vec<u8>>,
for_signing: bool,
for_verifying: bool,
}
#[wasm_bindgen]
impl EdDSA25519Key {
pub fn new(pubkey_bytes: Vec<u8>) -> Self {
Self {
pubkey_bytes,
prvkey_bytes: None,
for_signing: false,
for_verifying: false,
}
}
pub fn set_private_key(&mut self, private_key_bytes: Vec<u8>) {
self.prvkey_bytes = Some(private_key_bytes);
}
pub fn is_for_signing(&mut self) {
self.for_signing = true;
}
pub fn is_for_verifying(&mut self) {
self.for_verifying = true;
}
pub fn build(&self) -> COSEKey {
let mut key = COSEKey::new(&KeyType::OKP.into());
// crv
key.other_headers.insert(
ECKey::CRV.into(),
CBORValue::from_label(&Label::from(CurveType::Ed25519)));
// x
key.other_headers.insert(
ECKey::X.into(),
CBORValue::new_bytes(self.pubkey_bytes.clone()));
// d (privkey)
if let Some(d) = &self.prvkey_bytes {
key.other_headers.insert(
ECKey::D.into(),
CBORValue::new_bytes(d.clone()));
}
// alg
key.set_algorithm_id(&AlgorithmId::EdDSA.into());
// key-ops
if self.for_signing || self.for_verifying {
let mut key_ops = Labels::new();
if self.for_signing {
key_ops.add(&KeyOperation::Sign.into());
}
if self.for_verifying {
key_ops.add(&KeyOperation::Verify.into());
}
key.set_key_ops(&key_ops);
}
key
}
}
// TODO: a way to parse/check from COSEKey -> EdDSA25519 variant. Or should this be a wrapper not a builder?
#[cfg(test)]
mod tests {
use super::*;
// #[test]
// fn cose_sign1() {
// let mut protected_header = HeaderMap::new();
// protected_header.set_algorithm_id(&Label::new_int(&Int::new_i32(x: i32)));
// let headers = Headers::new(&protected, &unprotected);
// let payload = vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
// let mut builder = COSESign1Builder::new(&headers, payload, true);
// }
#[test]
fn eddsa25519key() {
let xpub = vec![0; 32];
let key = EdDSA25519Key::new(xpub.clone()).build();
// these serve to test the enum implementations too
assert_eq!(key.key_type().as_int().unwrap().as_i32().unwrap(), 1);
assert_eq!(key.algorithm_id().unwrap().as_int().unwrap().as_i32().unwrap(), -8);
assert_eq!(key.header(&Label::new_int(&Int::new_i32(-1))).unwrap().as_int().unwrap().as_i32().unwrap(), 6);
assert_eq!(key.header(&Label::new_int(&Int::new_i32(-2))).unwrap().as_bytes().unwrap(), xpub);
}
}