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Added HMAC example.

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Caleb Garrett 2024-02-12 20:33:04 -05:00
parent 37c869827e
commit f0f1f2d14c
2 changed files with 23 additions and 0 deletions
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1
examples/stm32f7/Cargo.toml
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@ -29,6 +29,7 @@ critical-section = "1.1"
embedded-storage = "0.3.1"
static_cell = "2"
sha2 = { version = "0.10.8", default-features = false }
hmac = "0.12.1"
[profile.release]
debug = 2

22
examples/stm32f7/src/bin/hash.rs
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@ -6,9 +6,12 @@ use embassy_executor::Spawner;
use embassy_stm32::hash::*;
use embassy_stm32::{bind_interrupts, hash, peripherals, Config};
use embassy_time::Instant;
use hmac::{Hmac, Mac};
use sha2::{Digest, Sha256};
use {defmt_rtt as _, panic_probe as _};
type HmacSha256 = Hmac<Sha256>;
bind_interrupts!(struct Irqs {
HASH_RNG => hash::InterruptHandler<peripherals::HASH>;
});
@ -52,5 +55,24 @@ async fn main(_spawner: Spawner) -> ! {
info!("Software Execution Time: {:?}", sw_execution_time);
assert_eq!(hw_digest, sw_digest[..]);
let hmac_key: [u8; 64] = [0x55; 64];
// Compute HMAC in hardware.
let mut sha256hmac_context = hw_hasher.start(Algorithm::SHA256, DataType::Width8, Some(&hmac_key));
hw_hasher.update(&mut sha256hmac_context, test_1).await;
hw_hasher.update(&mut sha256hmac_context, test_2).await;
let mut hw_hmac: [u8; 32] = [0; 32];
hw_hasher.finish(sha256hmac_context, &mut hw_hmac).await;
// Compute HMAC in software.
let mut sw_mac = HmacSha256::new_from_slice(&hmac_key).unwrap();
sw_mac.update(test_1);
sw_mac.update(test_2);
let sw_hmac = sw_mac.finalize().into_bytes();
info!("Hardware HMAC: {:?}", hw_hmac);
info!("Software HMAC: {:?}", sw_hmac[..]);
assert_eq!(hw_hmac, sw_hmac[..]);
loop {}
}