OpenJDK patch for bcpqc

Base commit: https://github.com/openjdk/jdk/commit/0f2113cee79b9645105b4753c7d7eacb83b872c2 (Tag jdk-18+36)

This repo contains a patch for OpenJDK required for bcpqc. This patch contains the following major changes:

• Publicly exposes sun.security.provider.SHA2 to allow for direct access to the SHA2 compression function
• Provide intrinsics for Haraka by re-implementing the following existing methods with intrinsics:
  • Haraka256 hash: com.sun.crypto.provider.AESCrypt::encryptBlock
  • Haraka512 hash: com.sun.crypto.provider.ElectronicCodeBook::encrypt
  • Haraka512 permutation (for HarakaS): com.sun.crypto.provider.AESCrypt::decryptBlock

ATTENTION: By repurposing existing intrinsics, this patch breaks existing JDK functionality. It is intended for evaluation purposes only and MUST NOT be used in any prodictive environment.

When executing Maven using a patched JDK, fetching dependencies will fail. Run Maven with another JDK (by setting JAVA_HOME) to fetch dependencies. Afterwards, Maven can be re-run with this JDK to compile the project.

Generate Patch

git diff 0f2113cee79b9645105b4753c7d7eacb83b872c2 patch-public-sha > ../jdk-patch/jdk.patch

Apply Patch and Build JDK

# Install dependencies
sudo apt install autoconf libfreetype6-dev libcups2-dev libx11-dev libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev libasound2-dev zip libfontconfig1-dev

# Clone and patch
git clone https://github.com/openjdk/jdk.git
cd jdk
git checkout -b patched-jdk 0f2113cee79b9645105b4753c7d7eacb83b872c2
git apply ../jdk-patch/jdk.patch

# Compile
bash configure
make images

Resulting JDK in build/linux-x86_64-server-release/images/jdk/.