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Correct tag generation.

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This commit is contained in:
Caleb Garrett 2024-02-23 16:05:18 -05:00
parent bf4cbd7577
commit 967b4927b0
2 changed files with 10 additions and 7 deletions
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8
embassy-stm32/src/cryp/mod.rs
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@ -1166,10 +1166,10 @@ impl<'d, T: Instance> Cryp<'d, T> {
T::regs().cr().modify(|w| w.set_gcm_ccmph(3));
T::regs().cr().modify(|w| w.set_crypen(true));
let headerlen1: u32 = (ctx.header_len >> 32) as u32;
let headerlen2: u32 = ctx.header_len as u32;
let payloadlen1: u32 = (ctx.payload_len >> 32) as u32;
let payloadlen2: u32 = ctx.payload_len as u32;
let headerlen1: u32 = ((ctx.header_len * 8) >> 32) as u32;
let headerlen2: u32 = (ctx.header_len * 8) as u32;
let payloadlen1: u32 = ((ctx.payload_len * 8) >> 32) as u32;
let payloadlen2: u32 = (ctx.payload_len * 8) as u32;
T::regs().din().write_value(headerlen1.swap_bytes());
T::regs().din().write_value(headerlen2.swap_bytes());

9
examples/stm32f7/src/bin/cryp.rs
View File

@ -51,13 +51,16 @@ async fn main(_spawner: Spawner) -> ! {
let sw_start_time = Instant::now();
//Encrypt in software using AES-GCM 128-bit
// Encrypt in software using AES-GCM 128-bit
let mut payload_vec: Vec<u8, 32> = Vec::from_slice(&payload).unwrap();
let cipher = Aes128Gcm::new(&key.into());
let _ = cipher.encrypt_in_place(&iv.into(), aad.into(), &mut payload_vec);
assert_eq!(ciphertext, payload_vec[0..ciphertext.len()]);
assert_eq!(encrypt_tag, payload_vec[ciphertext.len()..ciphertext.len() + encrypt_tag.len()]);
//Decrypt in software using AES-GCM 128-bit
let _ = cipher.encrypt_in_place(&iv.into(), aad.into(), &mut payload_vec);
// Decrypt in software using AES-GCM 128-bit
let _ = cipher.decrypt_in_place(&iv.into(), aad.into(), &mut payload_vec);
let sw_end_time = Instant::now();
let sw_execution_time = sw_end_time - sw_start_time;