AVBPayloadSigner is a tool for signing payload.bin of an incremental Android A/B OTA zip.

1. Use openssl to generate a private key.

   openssl genpkey -algorithm RSA -out ota.key

2. Ensure the Rust toolchain is installed.

3. Clone this git repo and build it.

   cargo build --release

   The output will be in target/release/AVBPayloadSigner.exe.

4. Start signing by following command-lines:

   AVBPayloadSigner \
       --input /path/to/old/payload.bin \
       --output /path/to/new/signed/payload.bin \
       --key /path/to/ota.key

Based on avbroot and references some of its code implementations.