Module dryoc::classic::crypto_pwhash

Password hashing

Implements libsodium’s crypto_pwhash_* functions. This implementation currently only supports Argon2i and Argon2id algorithms, and does not support scrypt.

To use the string-based functions, the base64 crate feature must be enabled.

For details, refer to libsodium docs.

Classic API example, key derivation

use base64::{Engine as _, engine::general_purpose};
use dryoc::classic::crypto_pwhash::*;
use dryoc::rng::copy_randombytes;
use dryoc::constants::{CRYPTO_SECRETBOX_KEYBYTES, CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE,
    CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE, CRYPTO_PWHASH_SALTBYTES};

let mut key = [0u8; CRYPTO_SECRETBOX_KEYBYTES];

// Randomly generate a salt
let mut salt = [0u8; CRYPTO_PWHASH_SALTBYTES];
copy_randombytes(&mut salt);

// Create a really good password
let password = b"It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them.";

crypto_pwhash(
    &mut key,
    password,
    &salt,
    CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE,
    CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE,
    PasswordHashAlgorithm::Argon2id13,
)
.expect("pwhash failed");

// now `key` can be used as a secret key
println!("key = {}", general_purpose::STANDARD_NO_PAD.encode(&key));

Enums

• PasswordHashAlgorithm
  Password hash algorithm implementations.

Functions

• crypto_pwhash
  Hashes password with salt, placing the resulting hash into output.
• crypto_pwhash_strbase64
  Wrapper for crypto_pwhash that returns a string encoding of a hashed password with a random salt, suitable for use with password hash storage (i.e., in a database). Can be used to verify a password using crypto_pwhash_str_verify.
• crypto_pwhash_str_needs_rehashbase64
  Checks if the parameters for hashed_password match those passed to the function. Returns false if the parameters match, and true if the parameters are mismatched (requiring a rehash).
• crypto_pwhash_str_verifybase64
  Verifies that hashed_password is valid for password, assuming the hashed password was encoded using crypto_pwhash_str.