bitcoin-sha256 0.1.20

SHA-256 and SHA-512 are novel hash functions computed with eight 32-bit and 64-bit words, respectively. They use different shift amounts and additive constants, but their structures are otherwise virtually identical, differing only in the number of rounds. (from wikipedia)
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// ---------------- [ File: bitcoin-sha256/src/beio_helpers.rs ]
crate::ix!();

/// Big‑endian helpers – private module‑local utilities
pub mod beio {

    #[inline]
    pub fn u32_into(dst: &mut [u8], v: u32) {
        dst[..4].copy_from_slice(&v.to_be_bytes());
    }

    #[inline]
    pub fn u64_into(dst: &mut [u8], v: u64) {
        dst[..8].copy_from_slice(&v.to_be_bytes());
    }
}

#[inline(always)]
pub unsafe fn read_be32(p: *const u8) -> u32 {
    u32::from_be_bytes([*p, *p.add(1), *p.add(2), *p.add(3)])
}