lower MSRV to 1.90, trim two stray comments in aacs handshake

Bisected the true floor: 1.85 fails to compile (needs is_multiple_of,
stabilized 1.87, and let-chains, stabilized 1.88), 1.90 builds/clippy/tests
clean. Repin Cargo.toml rust-version and every CI dtolnay/rust-toolchain to
1.90.0, and note the change in CHANGELOG.md. Also removed a redundant
"// Hash the data" comment and a stale duplicate doc line on
generate_host_key_pair_p256 found during a pass over the crate's comments.

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
   changelog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
       - name: Require a CHANGELOG entry for the crate version on main
         shell: bash
         run: |
@@ -51,7 +51,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: dtolnay/rust-toolchain@1.97.0
+      - uses: dtolnay/rust-toolchain@1.90.0
         with:
           components: clippy, rustfmt
       - uses: Swatinem/rust-cache@v2
@@ -65,7 +65,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: dtolnay/rust-toolchain@1.97.0
+      - uses: dtolnay/rust-toolchain@1.90.0
       - uses: Swatinem/rust-cache@v2
         with:
           shared-key: freemkv-unlock-ci
@@ -94,7 +94,7 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: dtolnay/rust-toolchain@1.97.0
+      - uses: dtolnay/rust-toolchain@1.90.0
       - uses: Swatinem/rust-cache@v2
         with:
           shared-key: freemkv-unlock-ci
@@ -117,7 +117,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v7
-      - uses: dtolnay/rust-toolchain@1.97.0
+      - uses: dtolnay/rust-toolchain@1.90.0
       - uses: Swatinem/rust-cache@v2
         with:
           shared-key: freemkv-unlock-ci

.github/workflows/qa.yml

@@ -74,7 +74,7 @@ jobs:
       - uses: actions/checkout@v7
         with:
           path: freemkv-unlock
-      - uses: dtolnay/rust-toolchain@1.97.0
+      - uses: dtolnay/rust-toolchain@1.90.0
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: freemkv-unlock
@@ -90,7 +90,7 @@ jobs:
       - uses: actions/checkout@v7
         with:
           path: freemkv-unlock
-      - uses: dtolnay/rust-toolchain@1.97.0
+      - uses: dtolnay/rust-toolchain@1.90.0
         with:
           components: clippy
       - uses: Swatinem/rust-cache@v2
@@ -110,7 +110,7 @@ jobs:
       - uses: actions/checkout@v7
         with:
           path: freemkv-unlock
-      - uses: dtolnay/rust-toolchain@1.97.0
+      - uses: dtolnay/rust-toolchain@1.90.0
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: freemkv-unlock

CHANGELOG.md

@@ -1,5 +1,29 @@
 # Changelog
 
+## [1.6.10] — 2026-08-23
+
+### Changed
+
+- Version aligned to 1.6.10 for the unified release. No functional changes to
+  this crate; the release was driven by libfreemkv (TrueHD/MLP audio now resyncs
+  to the next major-sync access unit after a source transport-stream
+  discontinuity, instead of splicing post-gap audio mid-stream — fixing
+  decoder-choking seams on discs whose stream carries a continuity-counter gap;
+  see the libfreemkv 1.6.10 notes).
+- MSRV lowered from 1.97 to 1.90. The crate does not use anything newer than
+  1.90 stabilized; CI's pinned toolchain and `rust-version` are updated to
+  match.
+
+## [1.6.9] — 2026-08-22
+
+### Changed
+
+- Version aligned to 1.6.9 for the unified release. No functional changes to
+  this crate; the release was driven by autorip (automatic per-episode TV
+  ripping — each episode named `S{NN}E{MM}`, with TMDB runtime-aligned episode
+  numbering across multi-disc seasons — a Manual Rename option, and a unified
+  per-disc staging state file — see the autorip 1.6.9 notes).
+
 ## [1.6.8] — 2026-08-21
 
 ### Changed

Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "freemkv-unlock"
-version = "1.6.8"
+version = "1.6.9"
 edition = "2024"
-rust-version = "1.97"
+rust-version = "1.90"
 license = "MIT"
 description = "Unlock layer for the freemkv toolchain: the Unlocker contract + self-contained firmware/AACS/CSS unlocker modules. libfreemkv depends on this and dispatches via all_unlockers()."
 repository = "https://github.com/freemkv/freemkv-unlock"

src/aacs/handshake.rs

@@ -442,7 +442,6 @@ fn ecdsa_sign(priv_key: &[u8; 20], data: &[u8]) -> ([u8; 20], [u8; 20]) {
     let g = EcPoint::from_bytes(&EC_GX, &EC_GY);
     let d = BigUint::from_bytes_be(priv_key);
 
-    // Hash the data
     let hash = Sha1::digest(data);
     let z = BigUint::from_bytes_be(&hash);
 
@@ -803,8 +802,7 @@ fn compute_bus_key(
     Some(bus_key)
 }
 
-/// Generate ephemeral host key pair: (private_key, public_point_x, public_point_y).
-/// Generate P-256 ephemeral key pair for AACS 2.0.
+/// Generate P-256 ephemeral key pair for AACS 2.0: (private_key, public_point_x, public_point_y).
 fn generate_host_key_pair_p256() -> ([u8; 32], [u8; 32], [u8; 32]) {
     let p_mod = BigUint::from_bytes_be(&P256_P);
     let a = BigUint::from_bytes_be(&P256_A);