nettle 7.5.0

Rust bindings for the Nettle cryptographic library
Documentation 
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use nettle_sys::{nettle_hkdf_expand, nettle_hkdf_extract};

use crate::hash::NettleHash;
use crate::mac::Hmac;
use crate::mac::Mac;

/// H. Krawczyks HMAC-based key derivation function (RFC 5869).
///
/// Derives `key` from `secret`, public `salt` and optional context `info`.
pub fn hkdf<H: NettleHash>(
    secret: &[u8],
    salt: &[u8],
    info: &[u8],
    key: &mut [u8],
) {
    let mut extract = Hmac::<H>::with_key(salt);
    let mut digest = vec![0u8; extract.mac_size()];

    unsafe {
        nettle_hkdf_extract(
            (&mut extract as *mut Hmac<H>) as *mut _,
            Some(Hmac::<H>::nettle_update),
            Some(Hmac::<H>::nettle_digest),
            digest.len(),
            secret.len(),
            secret.as_ptr(),
            digest.as_mut_ptr(),
        );
    }

    let mut expand = Hmac::<H>::with_key(&digest);

    unsafe {
        nettle_hkdf_expand(
            (&mut expand as *mut Hmac<H>) as *mut _,
            Some(Hmac::<H>::nettle_update),
            Some(Hmac::<H>::nettle_digest),
            digest.len(),
            info.len(),
            info.as_ptr(),
            key.len(),
            key.as_mut_ptr(),
        );
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::hash::insecure_do_not_use::Sha1;
    use crate::hash::Sha256;

    #[test]
    fn rfc_5869_case_1() {
        let secret = &b"\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"[..];
        let salt = &b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c"[..];
        let info = &b"\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9"[..];
        let mut key = vec![0u8; 42];

        hkdf::<Sha256>(secret, salt, info, &mut key);
        assert_eq!(&key[..], &b"\x3c\xb2\x5f\x25\xfa\xac\xd5\x7a\x90\x43\x4f\x64\xd0\x36\x2f\x2a\x2d\x2d\x0a\x90\xcf\x1a\x5a\x4c\x5d\xb0\x2d\x56\xec\xc4\xc5\xbf\x34\x00\x72\x08\xd5\xb8\x87\x18\x58\x65"[..]);
    }

    #[test]
    fn rfc_5869_case_2() {
        let secret = &b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f"[..];
        let salt = &b"\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf"[..];
        let info = &b"\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff"[..];
        let mut key = vec![0u8; 82];

        hkdf::<Sha256>(secret, salt, info, &mut key);

        assert_eq!(&key[..], &b"\xb1\x1e\x39\x8d\xc8\x03\x27\xa1\xc8\xe7\xf7\x8c\x59\x6a\x49\x34\x4f\x01\x2e\xda\x2d\x4e\xfa\xd8\xa0\x50\xcc\x4c\x19\xaf\xa9\x7c\x59\x04\x5a\x99\xca\xc7\x82\x72\x71\xcb\x41\xc6\x5e\x59\x0e\x09\xda\x32\x75\x60\x0c\x2f\x09\xb8\x36\x77\x93\xa9\xac\xa3\xdb\x71\xcc\x30\xc5\x81\x79\xec\x3e\x87\xc1\x4c\x01\xd5\xc1\xf3\x43\x4f\x1d\x87"[..]);
    }

    #[test]
    fn rfc_5869_case_3() {
        let secret = &b"\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"[..];
        let salt = &[];
        let info = &[];
        let mut key = vec![0u8; 42];

        hkdf::<Sha256>(secret, salt, info, &mut key);

        assert_eq!(&key[..], &b"\x8d\xa4\xe7\x75\xa5\x63\xc1\x8f\x71\x5f\x80\x2a\x06\x3c\x5a\x31\xb8\xa1\x1f\x5c\x5e\xe1\x87\x9e\xc3\x45\x4e\x5f\x3c\x73\x8d\x2d\x9d\x20\x13\x95\xfa\xa4\xb6\x1a\x96\xc8"[..]);
    }

    #[test]
    fn rfc_5869_case_4() {
        let secret = &b"\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"[..];
        let salt = &b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c"[..];
        let info = &b"\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9"[..];
        let mut key = vec![0u8; 42];

        hkdf::<Sha1>(secret, salt, info, &mut key);

        assert_eq!(&key[..], &b"\x08\x5a\x01\xea\x1b\x10\xf3\x69\x33\x06\x8b\x56\xef\xa5\xad\x81\xa4\xf1\x4b\x82\x2f\x5b\x09\x15\x68\xa9\xcd\xd4\xf1\x55\xfd\xa2\xc2\x2e\x42\x24\x78\xd3\x05\xf3\xf8\x96"[..]);
    }

    #[test]
    fn rfc_5869_case_5() {
        let secret = &b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f"[..];
        let salt = &b"\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf"[..];
        let info = &b"\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff"[..];
        let mut key = vec![0u8; 82];

        hkdf::<Sha1>(secret, salt, info, &mut key);

        assert_eq!(&key[..], &b"\x0b\xd7\x70\xa7\x4d\x11\x60\xf7\xc9\xf1\x2c\xd5\x91\x2a\x06\xeb\xff\x6a\xdc\xae\x89\x9d\x92\x19\x1f\xe4\x30\x56\x73\xba\x2f\xfe\x8f\xa3\xf1\xa4\xe5\xad\x79\xf3\xf3\x34\xb3\xb2\x02\xb2\x17\x3c\x48\x6e\xa3\x7c\xe3\xd3\x97\xed\x03\x4c\x7f\x9d\xfe\xb1\x5c\x5e\x92\x73\x36\xd0\x44\x1f\x4c\x43\x00\xe2\xcf\xf0\xd0\x90\x0b\x52\xd3\xb4"[..]);
    }

    #[test]
    fn rfc_5869_case_6() {
        let secret = &b"\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"[..];
        let salt = &[];
        let info = &[];
        let mut key = vec![0u8; 42];

        hkdf::<Sha1>(secret, salt, info, &mut key);

        assert_eq!(&key[..], &b"\x0a\xc1\xaf\x70\x02\xb3\xd7\x61\xd1\xe5\x52\x98\xda\x9d\x05\x06\xb9\xae\x52\x05\x72\x20\xa3\x06\xe0\x7b\x6b\x87\xe8\xdf\x21\xd0\xea\x00\x03\x3d\xe0\x39\x84\xd3\x49\x18"[..]);
    }

    #[test]
    fn rfc_5869_case_7() {
        let secret = &b"\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c"[..];
        let salt = &[];
        let info = &[];
        let mut key = vec![0u8; 42];

        hkdf::<Sha1>(secret, salt, info, &mut key);

        assert_eq!(&key[..], &b"\x2c\x91\x11\x72\x04\xd7\x45\xf3\x50\x0d\x63\x6a\x62\xf6\x4f\x0a\xb3\xba\xe5\x48\xaa\x53\xd4\x23\xb0\xd1\xf2\x7e\xbb\xa6\xf5\xe5\x67\x3a\x08\x1d\x70\xcc\xe7\xac\xfc\x48"[..]);
    }
}