native_neural_network 0.1.6

Lib no_std Rust for native neural network (.rnn)
Documentation 
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pub fn digest_to_hex_lower<const N: usize>(digest: &[u8; N], out: &mut [u8]) -> bool {
    const HEX: &[u8; 16] = b"0123456789abcdef";
    if out.len() < N * 2 {
        return false;
    }
    for i in 0..N {
        let b = digest[i];
        out[i * 2] = HEX[(b >> 4) as usize];
        out[i * 2 + 1] = HEX[(b & 0x0f) as usize];
    }
    true
}

pub fn constant_time_eq(a: &[u8], b: &[u8]) -> bool {
    if a.len() != b.len() {
        return false;
    }
    let mut diff = 0u8;
    for i in 0..a.len() {
        diff |= a[i] ^ b[i];
    }
    diff == 0
}