mirror of
https://github.com/embassy-rs/embassy.git
synced 2025-10-02 14:44:32 +00:00
83 lines
2.7 KiB
Rust
83 lines
2.7 KiB
Rust
#![no_std]
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#![no_main]
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use aes_gcm::aead::heapless::Vec;
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use aes_gcm::aead::{AeadInPlace, KeyInit};
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use aes_gcm::Aes128Gcm;
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use defmt::info;
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use embassy_executor::Spawner;
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use embassy_stm32::cryp::{self, *};
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use embassy_stm32::{bind_interrupts, peripherals, Config};
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use embassy_time::Instant;
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use {defmt_rtt as _, panic_probe as _};
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bind_interrupts!(struct Irqs {
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CRYP => cryp::InterruptHandler<peripherals::CRYP>;
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});
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) -> ! {
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let config = Config::default();
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let p = embassy_stm32::init(config);
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let payload: &[u8] = b"hello world";
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let aad: &[u8] = b"additional data";
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let mut hw_cryp = Cryp::new(p.CRYP, p.DMA2_CH6, p.DMA2_CH5, Irqs);
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let key: [u8; 16] = [0; 16];
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let mut ciphertext: [u8; 11] = [0; 11];
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let mut plaintext: [u8; 11] = [0; 11];
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let iv: [u8; 12] = [0; 12];
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let hw_start_time = Instant::now();
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// Encrypt in hardware using AES-GCM 128-bit
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let aes_gcm = AesGcm::new(&key, &iv);
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let mut gcm_encrypt = hw_cryp.start(&aes_gcm, Direction::Encrypt).await;
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hw_cryp.aad(&mut gcm_encrypt, aad, true).await;
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hw_cryp.payload(&mut gcm_encrypt, payload, &mut ciphertext, true).await;
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let encrypt_tag = hw_cryp.finish(gcm_encrypt).await;
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// Decrypt in hardware using AES-GCM 128-bit
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let mut gcm_decrypt = hw_cryp.start(&aes_gcm, Direction::Decrypt).await;
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hw_cryp.aad(&mut gcm_decrypt, aad, true).await;
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hw_cryp
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.payload(&mut gcm_decrypt, &ciphertext, &mut plaintext, true)
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.await;
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let decrypt_tag = hw_cryp.finish(gcm_decrypt).await;
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let hw_end_time = Instant::now();
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let hw_execution_time = hw_end_time - hw_start_time;
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info!("AES-GCM Ciphertext: {:?}", ciphertext);
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info!("AES-GCM Plaintext: {:?}", plaintext);
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assert_eq!(payload, plaintext);
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assert_eq!(encrypt_tag, decrypt_tag);
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let sw_start_time = Instant::now();
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// Encrypt in software using AES-GCM 128-bit
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let mut payload_vec: Vec<u8, 32> = Vec::from_slice(&payload).unwrap();
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let cipher = Aes128Gcm::new(&key.into());
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let _ = cipher.encrypt_in_place(&iv.into(), aad.into(), &mut payload_vec);
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assert_eq!(ciphertext, payload_vec[0..ciphertext.len()]);
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assert_eq!(
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encrypt_tag,
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payload_vec[ciphertext.len()..ciphertext.len() + encrypt_tag.len()]
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);
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// Decrypt in software using AES-GCM 128-bit
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cipher
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.decrypt_in_place(&iv.into(), aad.into(), &mut payload_vec)
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.unwrap();
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let sw_end_time = Instant::now();
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let sw_execution_time = sw_end_time - sw_start_time;
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info!("Hardware Execution Time: {:?}", hw_execution_time);
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info!("Software Execution Time: {:?}", sw_execution_time);
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loop {}
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}
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