native_neural_network_std 0.2.1

Ergonomic std wrapper for the `native_neural_network` crate (no_std) — std-friendly re-exports and utilities.
Documentation 
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pub struct Sha256Std {
    inner: native_neural_network::crypto::Sha256Ctx,
}

impl Sha256Std {
    pub fn new() -> Self {
        Self {
            inner: native_neural_network::crypto::Sha256Ctx::new(),
        }
    }
    pub fn update(&mut self, data: &[u8]) {
        self.inner.update(data);
    }
    pub fn finalize(&mut self) -> [u8; 32] {
        let mut out = [0u8; 32];
        self.inner.finalize(&mut out);
        out
    }
}

impl Default for Sha256Std {
    fn default() -> Self {
        Self::new()
    }
}

pub struct Sha512Std {
    inner: native_neural_network::crypto::Sha512Ctx,
}

impl Sha512Std {
    pub fn new() -> Self {
        Self {
            inner: native_neural_network::crypto::Sha512Ctx::new(),
        }
    }
    pub fn update(&mut self, data: &[u8]) {
        self.inner.update(data);
    }
    pub fn finalize(&mut self) -> [u8; 64] {
        let mut out = [0u8; 64];
        self.inner.finalize(&mut out);
        out
    }
}

impl Default for Sha512Std {
    fn default() -> Self {
        Self::new()
    }
}

pub fn sha256_bytes(data: &[u8]) -> [u8; 32] {
    let mut c = native_neural_network::crypto::Sha256Ctx::new();
    c.update(data);
    let mut out = [0u8; 32];
    c.finalize(&mut out);
    out
}

pub fn sha512_bytes(data: &[u8]) -> [u8; 64] {
    let mut c = native_neural_network::crypto::Sha512Ctx::new();
    c.update(data);
    let mut out = [0u8; 64];
    c.finalize(&mut out);
    out
}

impl core::fmt::Debug for Sha256Std {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        f.debug_struct("Sha256Std").finish()
    }
}
impl core::fmt::Debug for Sha512Std {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        f.debug_struct("Sha512Std").finish()
    }
}

pub fn digest_to_hex_lower(digest: &[u8]) -> Option<String> {
    if digest.is_empty() {
        return Some(String::new());
    }
    let mut out = String::with_capacity(digest.len() * 2);
    for &b in digest {
        out.push_str(&format!("{:02x}", b));
    }
    Some(out)
}

pub fn constant_time_eq(a: &[u8], b: &[u8]) -> bool {
    native_neural_network::crypto::constant_time_eq(a, b)
}

pub fn verify_sha256(data: &[u8], expected: &[u8]) -> bool {
    if expected.len() != 32 {
        return false;
    }
    let exp: &[u8; 32] = match expected.try_into() {
        Ok(a) => a,
        Err(_) => return false,
    };
    native_neural_network::crypto::verify_sha256(data, exp)
}

pub fn verify_sha512(data: &[u8], expected: &[u8]) -> bool {
    if expected.len() != 64 {
        return false;
    }
    let exp: &[u8; 64] = match expected.try_into() {
        Ok(a) => a,
        Err(_) => return false,
    };
    native_neural_network::crypto::verify_sha512(data, exp)
}

pub fn hash(data: &[u8]) -> [u8; 32] {
    sha256_bytes(data)
}

pub enum HashAlgorithm {
    Sha256,
    Sha512,
}

pub fn hash_with(alg: HashAlgorithm, data: &[u8]) -> Vec<u8> {
    match alg {
        HashAlgorithm::Sha256 => {
            let out = sha256_bytes(data);
            let mut v = Vec::with_capacity(32);
            v.extend_from_slice(&out);
            v
        }
        HashAlgorithm::Sha512 => {
            let out = sha512_bytes(data);
            let mut v = Vec::with_capacity(64);
            v.extend_from_slice(&out);
            v
        }
    }
}

fn crypto_init_hook() -> Result<(), crate::InitError> {
    Ok(())
}

pub fn register_module_init_hooks() -> Result<(), crate::RegisterError> {
    crate::register_init_hook("crypto", crate::InitSubsystem::Crypto, crypto_init_hook)
}