Adding upstream version 0.70.1+ds1.upstream/0.70.1+ds1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# [RustCrypto]: PEM Encoding ([RFC 7468])
+
+[![crate][crate-image]][crate-link]
+[![Docs][docs-image]][docs-link]
+[![Build Status][build-image]][build-link]
+![Apache2/MIT licensed][license-image]
+![Rust Version][rustc-image]
+[![Project Chat][chat-image]][chat-link]
+
+Pure Rust implementation of PEM Encoding ([RFC 7468]) for PKIX, PKCS, and
+CMS Structures, a strict subset of the original Privacy-Enhanced Mail encoding
+intended  specifically for use with cryptographic keys, certificates, and other
+messages.
+
+Provides a `no_std`-friendly, constant-time implementation suitable for use with
+cryptographic private keys.
+
+[Documentation][docs-link]
+
+## About
+
+Many cryptography-related document formats, such as certificates (PKIX),
+private and public keys/keypairs (PKCS), and other cryptographic messages (CMS)
+provide an ASCII encoding which can be traced back to Privacy-Enhanced Mail
+(PEM) as defined [RFC 1421], which look like the following:
+
+```text
+-----BEGIN PRIVATE KEY-----
+MC4CAQAwBQYDK2VwBCIEIBftnHPp22SewYmmEoMcX8VwI4IHwaqd+9LFPj/15eqF
+-----END PRIVATE KEY-----
+```
+
+However, all of these formats actually implement a text-based encoding that is
+similar but *not* identical to the legacy PEM encoding as described in
+[RFC 1421].
+
+For this reason, [RFC 7468] was created to describe a stricter form of
+"PEM encoding" for use in these applications which codifies the previously
+de facto rules that most implementations operate by, and makes recommendations
+to promote interoperability.
+
+This crate provides a strict interpretation of the [RFC 7468] rules,
+implementing MUSTs and SHOULDs while avoiding the MAYs, targeting the
+"ABNF (Strict)" subset of the grammar as described in
+[RFC 7468 Section 3 Figure 3 (p6)][RFC 7468 p6].
+
+## Implementation notes
+
+- `no_std`-friendly core implementation which requires no heap allocations
+  and avoids copies and temporary buffers.
+- Optional `alloc`-dependent convenience features and buffered decoder/encoder.
+- Uses the [`base64ct`] crate to decode/encode Base64 in constant-time.
+- PEM parser avoids branching on potentially secret data as much as possible.
+
+The paper [Util::Lookup: Exploiting key decoding in cryptographic libraries][Util::Lookup]
+demonstrates how the leakage from non-constant-time PEM parsers can be used
+to practically extract RSA private keys from SGX enclaves.
+
+## Minimum Supported Rust Version
+
+This crate requires **Rust 1.60** at a minimum.
+
+We may change the MSRV in the future, but it will be accompanied by a minor
+version bump.
+
+## License
+
+Licensed under either of:
+
+- [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
+- [MIT license](http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
+
+[//]: # (badges)
+
+[crate-image]: https://buildstats.info/crate/pem-rfc7468
+[crate-link]: https://crates.io/crates/pem-rfc7468
+[docs-image]: https://docs.rs/pem-rfc7468/badge.svg
+[docs-link]: https://docs.rs/pem-rfc7468/
+[build-image]: https://github.com/RustCrypto/formats/actions/workflows/pem-rfc7468.yml/badge.svg
+[build-link]: https://github.com/RustCrypto/formats/actions/workflows/pem-rfc7468.yml
+[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.60+-blue.svg
+[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
+[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/300570-formats
+
+[//]: # (links)
+
+[RustCrypto]: https://github.com/rustcrypto
+[RFC 1421]: https://datatracker.ietf.org/doc/html/rfc1421
+[RFC 7468]: https://datatracker.ietf.org/doc/html/rfc7468
+[RFC 7468 p6]: https://datatracker.ietf.org/doc/html/rfc7468#page-6
+[`base64ct`]: https://github.com/RustCrypto/formats/tree/master/base64ct
+[Util::Lookup]: https://arxiv.org/pdf/2108.04600.pdf