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The best crypto you've never heard of, brought to you by Phil Rogaway

Rust implementation of Miscreant: Advanced symmetric encryption library which provides the AES-SIV (RFC 5297), AES-PMAC-SIV, and STREAM constructions. These algorithms are easy-to-use (or rather, hard-to-misuse) and support encryption of individual messages or message streams.



AES-SIV and AES-PMAC-SIV provide nonce-reuse misuse-resistance (NRMR): accidentally reusing a nonce with this construction is not a security catastrophe, unlike more popular AES encryption modes like AES-GCM where nonce reuse leaks both the authentication key and the XOR of both plaintexts, both of which can potentially be leveraged for full plaintext recovery attacks.

With AES-SIV, the worst outcome of reusing a nonce is an attacker can see you've sent the same plaintext twice, as opposed to almost all other AES modes where it can facilitate chosen ciphertext attacks.

Requirements works on stable rust since 1.27. By default it is built with aesni support which requires an x86 instruction set. You can disable this with the aes-soft feature flag which enables usage on other architectures.

The default configuration uses the core::arch API for stable access to CPU intrinsics, namely the Intel AES-NI instructions which provide a hardware implementation of AES.

To access these features, you will need to pass the following as RUSTFLAGS:


You can configure your ~/.cargo/config to always pass these flags:

rustflags = ["-Ctarget-feature=+aes"]

Help and Discussion

Have questions? Want to suggest a feature or change?

Security Notice

Though this library is written by cryptographic professionals, it has not undergone a thorough security audit, and cryptographic professionals are still humans that make mistakes.

This library makes an effort to use constant time operations throughout its implementation, however actual constant time behavior has not been verified.

Use this library at your own risk.

Code of Conduct

We abide by the Contributor Covenant and ask that you do as well.

For more information, please see


Bug reports and pull requests are welcome on GitHub at

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 noted below, without any additional terms or conditions.


Copyright (c) 2017-2018 The Miscreant Developers.

The Rust implementation of Miscrenant specifically is licensed under either of:

at your option.