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//! Implementation of crypto primitives using the Windows CNG (Cryptographic API: Next Generation).
use crate::types::*;
use win_crypto_ng::random::RandomNumberGenerator;
pub mod aead;
pub mod asymmetric;
pub mod ecdh;
pub mod hash;
pub mod symmetric;
/// Returns a short, human-readable description of the backend.
pub fn backend() -> String {
// XXX: can we include features and the version?
"Windows CNG".to_string()
}
/// Fills the given buffer with random data.
pub fn random(buf: &mut [u8]) {
RandomNumberGenerator::system_preferred()
.gen_random(buf)
.expect("system-preferred RNG not to fail")
}
impl PublicKeyAlgorithm {
pub(crate) fn is_supported_by_backend(&self) -> bool {
use PublicKeyAlgorithm::*;
#[allow(deprecated)]
match &self {
RSAEncryptSign | RSAEncrypt | RSASign | DSA | ECDH | ECDSA | EdDSA
=> true,
ElGamalEncrypt | ElGamalEncryptSign | Private(_) | Unknown(_)
=> false,
}
}
}
impl Curve {
pub(crate) fn is_supported_by_backend(&self) -> bool {
use self::Curve::*;
match &self {
NistP256 | NistP384 | NistP521 | Ed25519 | Cv25519
=> true,
BrainpoolP256 | BrainpoolP512 | Unknown(_)
=> false,
}
}
}
impl AEADAlgorithm {
/// Returns the best AEAD mode supported by the backend.
///
/// This SHOULD return OCB, which is the mandatory-to-implement
/// algorithm and the most performing one, but fall back to any
/// supported algorithm.
pub(crate) const fn const_default() -> AEADAlgorithm {
AEADAlgorithm::EAX
}
pub(crate) fn is_supported_by_backend(&self) -> bool {
use self::AEADAlgorithm::*;
match &self {
EAX
=> true,
OCB | Private(_) | Unknown(_)
=> false,
}
}
}
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