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Use rand crate re-exports when available #64

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Mar 28, 2024
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Use rand crate re-exports when available #64

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11 changes: 9 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,13 @@ pub extern crate serde;

use core::{fmt, str};

/// We support a wide range of dependency versions for `rand` and `rand_core` and not
/// all versions play nicely together. These re-exports fix that.
#[cfg(all(feature = "rand", feature = "rand_core"))]
use rand::{CryptoRng, RngCore};
#[cfg(all(not(feature = "rand"), feature = "rand_core"))]
use rand_core::{CryptoRng, RngCore};

#[cfg(feature = "std")]
use std::borrow::Cow;
#[cfg(feature = "std")]
Expand Down Expand Up @@ -262,15 +269,15 @@ impl Mnemonic {
word_count: usize,
) -> Result<Mnemonic, Error>
where
R: rand_core::RngCore + rand_core::CryptoRng,
R: RngCore + CryptoRng,
{
if is_invalid_word_count(word_count) {
return Err(Error::BadWordCount(word_count));
}

let entropy_bytes = (word_count / 3) * 4;
let mut entropy = [0u8; (MAX_NB_WORDS / 3) * 4];
rand_core::RngCore::fill_bytes(rng, &mut entropy[0..entropy_bytes]);
RngCore::fill_bytes(rng, &mut entropy[0..entropy_bytes]);
Mnemonic::from_entropy_in(language, &entropy[0..entropy_bytes])
}

Expand Down