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diff --git a/vendor/spki/src/lib.rs b/vendor/spki/src/lib.rs
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+#![no_std]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![doc = include_str!("../README.md")]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg",
+    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/media/6ee8e381/logo.svg"
+)]
+#![forbid(unsafe_code)]
+#![warn(
+    clippy::mod_module_files,
+    clippy::unwrap_used,
+    missing_docs,
+    rust_2018_idioms,
+    unused_lifetimes,
+    unused_qualifications
+)]
+//! # Usage
+//! The following example demonstrates how to use an OID as the `parameters`
+//! of an [`AlgorithmIdentifier`].
+//!
+//! Borrow the [`ObjectIdentifier`] first then use [`der::AnyRef::from`] or `.into()`:
+//!
+//! ```
+//! use spki::{AlgorithmIdentifier, ObjectIdentifier};
+//!
+//! let alg_oid = "1.2.840.10045.2.1".parse::<ObjectIdentifier>().unwrap();
+//! let params_oid = "1.2.840.10045.3.1.7".parse::<ObjectIdentifier>().unwrap();
+//!
+//! let alg_id = AlgorithmIdentifier {
+//!     oid: alg_oid,
+//!     parameters: Some(params_oid)
+//! };
+//! ```
+
+#[cfg(feature = "alloc")]
+#[allow(unused_extern_crates)]
+extern crate alloc;
+#[cfg(feature = "std")]
+extern crate std;
+
+mod algorithm;
+mod error;
+mod spki;
+mod traits;
+
+#[cfg(feature = "fingerprint")]
+mod fingerprint;
+
+pub use crate::{
+    algorithm::{AlgorithmIdentifier, AlgorithmIdentifierRef, AlgorithmIdentifierWithOid},
+    error::{Error, Result},
+    spki::{SubjectPublicKeyInfo, SubjectPublicKeyInfoRef},
+    traits::{AssociatedAlgorithmIdentifier, DecodePublicKey, SignatureAlgorithmIdentifier},
+};
+pub use der::{self, asn1::ObjectIdentifier};
+
+#[cfg(feature = "alloc")]
+pub use {
+    crate::{
+        algorithm::AlgorithmIdentifierOwned,
+        spki::SubjectPublicKeyInfoOwned,
+        traits::{
+            DynAssociatedAlgorithmIdentifier, DynSignatureAlgorithmIdentifier, EncodePublicKey,
+            SignatureBitStringEncoding,
+        },
+    },
+    der::Document,
+};
+
+#[cfg(feature = "fingerprint")]
+pub use crate::fingerprint::FingerprintBytes;