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aacs: extract crypto.rs (shared AES primitives + constants)

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Relocate the shared low-level primitives into a single crypto module:
aes_ecb_encrypt/decrypt, aes_cbc_decrypt, aes_g (from content/variant) and
aesg3 + AESG3_SEED (from keys), plus AACS_IV. Fixes the scatter where AES-G
lived in the 2.1 file and AES-G3 in keys. Relocation only — no rename, no
logic change (logic-hash identical to baseline; 277 items; 2210 tests green).
This commit is contained in:
Matthew Jackson
2026-07-04 13:37:53 -07:00
parent 31b0ba323a
commit f55d8f7acd
11 changed files with 138 additions and 119 deletions
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src/decrypt.rs
+2 -2
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@@ -1129,13 +1129,13 @@ mod tests {
// the per-unit key so the recovered plaintext header matches.
unit[0] |= 0xC0;
let header: [u8; 16] = unit[..16].try_into().unwrap();
let derived = crate::aacs::content::aes_ecb_encrypt(unit_key, &header);
let derived = crate::aacs::crypto::aes_ecb_encrypt(unit_key, &header);
let mut k = [0u8; 16];
for i in 0..16 {
k[i] = derived[i] ^ header[i];
}
let cipher = Aes128::new(GenericArray::from_slice(&k));
let mut prev = crate::aacs::content::AACS_IV;
let mut prev = crate::aacs::crypto::AACS_IV;
let num_blocks = (aacs::ALIGNED_UNIT_LEN - 16) / 16;
for i in 0..num_blocks {
let off = 16 + i * 16;