#crypto #key #pkcs #private

no-std pkcs8

Pure Rust implementation of Public-Key Cryptography Standards (PKCS) #8: Private-Key Information Syntax Specification (RFC 5208), with additional support for PKCS#8v2 asymmetric key packages (RFC 5958)

26 releases

Uses new Rust 2021

0.9.0 May 8, 2022
0.9.0-pre.1 Mar 14, 2022
0.8.0 Nov 16, 2021
0.7.5 Jul 26, 2021
0.0.0 Jun 12, 2020

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RustCrypto: PKCS#8 (Private Keys)

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Pure Rust implementation of Public-Key Cryptography Standards (PKCS) #8: Private-Key Information Syntax Specification (RFC 5208).


About PKCS#8

PKCS#8 is a format for cryptographic private keys, often containing pairs of private and public keys.

You can identify a PKCS#8 private key encoded as PEM (i.e. text) by the following:


PKCS#8 private keys can optionally be encrypted under a password using key derivation algorithms like PBKDF2 and scrypt, and encrypted with ciphers like AES-CBC. When a PKCS#8 private key has been encrypted, it starts with the following:


PKCS#8 private keys can also be serialized in an ASN.1-based binary format. The PEM text encoding is a Base64 representation of this format.

Supported Algorithms

This crate is implemented in an algorithm-agnostic manner with the goal of enabling PKCS#8 support for any algorithm.

That said, it has been tested for interoperability against keys generated by OpenSSL for the following algorithms:

  • ECC (id-ecPublicKey)
  • Ed25519 (id-Ed25519)
  • RSA (id-rsaEncryption)
  • X25519 (id-X25519)

Please open an issue if you encounter trouble using it with a particular algorithm, including the ones listed above or other algorithms.

Minimum Supported Rust Version

This crate requires Rust 1.57 at a minimum.

We may change the MSRV in the future, but it will be accompanied by a minor version bump.


Licensed under either of:

at your option.


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.