chore: checkpoint before Python removal

vendor/der/tests/pem.rs

@@ -0,0 +1,67 @@
+//! PEM decoding and encoding tests.
+
+#![cfg(all(feature = "derive", feature = "oid", feature = "pem"))]
+
+use der::{
+    asn1::{BitString, ObjectIdentifier},
+    pem::{LineEnding, PemLabel},
+    Decode, DecodePem, EncodePem, Sequence,
+};
+
+/// Example SPKI document encoded as DER.
+const SPKI_DER: &[u8] = include_bytes!("examples/spki.der");
+
+/// Example SPKI document encoded as PEM.
+const SPKI_PEM: &str = include_str!("examples/spki.pem");
+
+/// X.509 `AlgorithmIdentifier`
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Sequence)]
+pub struct AlgorithmIdentifier {
+    pub algorithm: ObjectIdentifier,
+    // pub parameters: ... (not used in spki.pem)
+}
+
+/// X.509 `SubjectPublicKeyInfo` (SPKI) in borrowed form
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Sequence)]
+pub struct SpkiBorrowed<'a> {
+    pub algorithm: AlgorithmIdentifier,
+    #[asn1(type = "BIT STRING")]
+    pub subject_public_key: &'a [u8],
+}
+
+impl PemLabel for SpkiBorrowed<'_> {
+    const PEM_LABEL: &'static str = "PUBLIC KEY";
+}
+
+/// X.509 `SubjectPublicKeyInfo` (SPKI) in owned form
+#[derive(Clone, Debug, Eq, PartialEq, Sequence)]
+pub struct SpkiOwned {
+    pub algorithm: AlgorithmIdentifier,
+    pub subject_public_key: BitString,
+}
+
+impl PemLabel for SpkiOwned {
+    const PEM_LABEL: &'static str = "PUBLIC KEY";
+}
+
+#[test]
+fn from_pem() {
+    // Decode PEM to owned form.
+    let pem_spki = SpkiOwned::from_pem(SPKI_PEM).unwrap();
+
+    // Decode DER to borrowed form.
+    let der_spki = SpkiBorrowed::from_der(SPKI_DER).unwrap();
+
+    assert_eq!(pem_spki.algorithm, der_spki.algorithm);
+    assert_eq!(
+        pem_spki.subject_public_key.raw_bytes(),
+        der_spki.subject_public_key
+    );
+}
+
+#[test]
+fn to_pem() {
+    let spki = SpkiBorrowed::from_der(SPKI_DER).unwrap();
+    let pem = spki.to_pem(LineEnding::LF).unwrap();
+    assert_eq!(&pem, SPKI_PEM);
+}