Function extern_bigint_to_nibbles

bitvm/src/chunk/helpers.rs:22–26

(msg: ark_ff::BigInt<4>)

}

pub(crate) fn extern_bigint_to_nibbles(msg: ark_ff::BigInt<4>) -> [u8; 64] {
    let v = fq_to_chunked_bits(msg, 4);
    let vu8: Vec<u8> = v.iter().map(|x| (*x) as u8).collect();
    vu8.try_into().unwrap()
}

fn fq_to_chunked_bits(fq: BigInt<4>, limb_size: usize) -> Vec<u32> {
    let bits: Vec<bool> = ark_ff::BitIteratorBE::new(fq.as_ref()).collect();