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Safety Dance Build Status Documentation


Add the following to Cargo.toml:

bcrypt = "0.15"

The minimum Rust version is 1.60.0.


The crate makes 3 things public: DEFAULT_COST, hash, verify.

extern crate bcrypt;

use bcrypt::{DEFAULT_COST, hash, verify};

let hashed = hash("hunter2", DEFAULT_COST)?;
let valid = verify("hunter2", &hashed)?;

The cost needs to be an integer between 4 and 31 (see benchmarks to have an idea of the speed for each), the DEFAULT_COST is 12.


bcrypt crate supports no_std platforms. When alloc feature is enabled, all crate functionality is available. When alloc is not enabled only the raw bcrypt() function is usable.


Speed depends on the cost used: the highest the slowest. Here are some benchmarks on a 2019 Macbook Pro to give you some ideas on the cost/speed ratio. Note that I don't go above 14 as it takes too long.

test bench_cost_10      ... bench:  51,474,665 ns/iter (+/- 16,006,581)
test bench_cost_14      ... bench: 839,109,086 ns/iter (+/- 274,507,463)
test bench_cost_4       ... bench:     795,814 ns/iter (+/- 42,838)
test bench_cost_default ... bench: 195,344,338 ns/iter (+/- 8,329,675)


This gist for the hash splitting and the null termination.


While bcrypt works well as an algorithm, using something like Argon2 is recommended for new projects.


  • 0.15.1: update base64 dependency
  • 0.15.0: add an alloc feature that can be disabled.
  • 0.14.0: use subtle crate for constant time comparison, update base64 and bump to 2021 edition
  • 0.13.0: make zeroize dep opt-out and use fixed salt length
  • 0.12.1: zero vec containing password in the hashing function before returning the hash
  • 0.12.0: allow null bytes in password
  • 0.11.0: update deps causing big bump in MSRV
  • 0.10.1: fix panic with invalid hashes and allow 2x
  • 0.10.0: update blowfish to 0.8 and minimum Rust version to 1.43.0.
  • 0.9.0: update base64 to 0.13 and getrandom to 0.2
  • 0.8.2: fix no-std build
  • 0.8.0: constant time verification for hash, remove custom base64 code from repo and add std feature
  • 0.7.0: add HashParts::from_str and remove Error::description impl, it's deprecated
  • 0.6.3: add hash_with_salt function and make Version::format_for_version public
  • 0.6.2: update base64 to 0.12
  • 0.6.1: update base64 to 0.11
  • 0.6.0: allow users to choose the bcrypt version and default to 2b instead of 2y
  • 0.5.0: expose the inner bcrypt function + edition 2018
  • 0.4.0: make DEFAULT_COST const instead of static
  • 0.3.0: forbid NULL bytes in passwords & update dependencies
  • 0.2.2: update rand
  • 0.2.1: update rand
  • 0.2.0: replace rust-crypto with blowfish, use some more modern Rust things like ? and handle more errors
  • 0.1.6: update rand and base64 deps
  • 0.1.5: update lazy-static to 1.0
  • 0.1.4: Replace rustc-serialize dependency with bcrypt
  • 0.1.3: Fix panic when password > 72 chars
  • 0.1.1: make BcryptResult, BcryptError public and update dependencies
  • 0.1.0: initial release


Easily hash and verify passwords using Bcrypt







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