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//! Affine arithmetic tests.
#![cfg(all(feature = "arithmetic", feature = "test-vectors"))]
use elliptic_curve::{
group::{prime::PrimeCurveAffine, GroupEncoding},
sec1::{FromEncodedPoint, ToEncodedPoint},
};
use hex_literal::hex;
use p384::{AffinePoint, EncodedPoint};
const UNCOMPRESSED_BASEPOINT: &[u8] = &hex!(
"04 aa87ca22 be8b0537 8eb1c71e f320ad74 6e1d3b62 8ba79b98
59f741e0 82542a38 5502f25d bf55296c 3a545e38 72760ab7
3617de4a 96262c6f 5d9e98bf 9292dc29 f8f41dbd 289a147c
e9da3113 b5f0b8c0 0a60b1ce 1d7e819d 7a431d7c 90ea0e5f"
);
const COMPRESSED_BASEPOINT: &[u8] = &hex!(
"03 aa87ca22 be8b0537 8eb1c71e f320ad74 6e1d3b62 8ba79b98
59f741e0 82542a38 5502f25d bf55296c 3a545e38 72760ab7"
);
#[test]
fn uncompressed_round_trip() {
let pubkey = EncodedPoint::from_bytes(UNCOMPRESSED_BASEPOINT).unwrap();
let point = AffinePoint::from_encoded_point(&pubkey).unwrap();
assert_eq!(point, AffinePoint::generator());
let res: EncodedPoint = point.into();
assert_eq!(res, pubkey);
}
#[test]
fn compressed_round_trip() {
let pubkey = EncodedPoint::from_bytes(COMPRESSED_BASEPOINT).unwrap();
let point = AffinePoint::from_encoded_point(&pubkey).unwrap();
assert_eq!(point, AffinePoint::generator());
let res: EncodedPoint = point.to_encoded_point(true);
assert_eq!(res, pubkey);
}
#[test]
fn uncompressed_to_compressed() {
let encoded = EncodedPoint::from_bytes(UNCOMPRESSED_BASEPOINT).unwrap();
let res = AffinePoint::from_encoded_point(&encoded)
.unwrap()
.to_encoded_point(true);
assert_eq!(res.as_bytes(), COMPRESSED_BASEPOINT);
}
#[test]
fn compressed_to_uncompressed() {
let encoded = EncodedPoint::from_bytes(COMPRESSED_BASEPOINT).unwrap();
let res = AffinePoint::from_encoded_point(&encoded)
.unwrap()
.to_encoded_point(false);
assert_eq!(res.as_bytes(), UNCOMPRESSED_BASEPOINT);
}
#[test]
fn affine_negation() {
let basepoint = AffinePoint::generator();
assert_eq!(-(-basepoint), basepoint);
}
#[test]
fn identity_encoding() {
// This is technically an invalid SEC1 encoding, but is preferable to panicking.
assert_eq!([0; 49], AffinePoint::IDENTITY.to_bytes().as_slice());
assert!(bool::from(
AffinePoint::from_bytes(&AffinePoint::IDENTITY.to_bytes())
.unwrap()
.is_identity()
))
}
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