Build openSSL 1.1.1u for android

build.sh

#!/bin/bash
set -e

# Variables
OPENSSL_VERSION="openssl-1.1.1u"
NDK_VERSION="android-ndk-r26d"
ANDROID_API="21"
ANDROID_ARCHS=("arm" "arm64" "x86" "x86_64")

# Create and navigate to the working directory
mkdir -p openssl
cd openssl

# Download OpenSSL
if [ ! -f ${OPENSSL_VERSION}.tar.gz ]; then
    wget https://www.openssl.org/source/${OPENSSL_VERSION}.tar.gz
fi
tar -xf ${OPENSSL_VERSION}.tar.gz

# Download and unzip Android NDK
if [ ! -d ${NDK_VERSION} ]; then
    wget https://dl.google.com/android/repository/${NDK_VERSION}-linux.zip
    unzip ${NDK_VERSION}-linux.zip
fi

# Set NDK path
export ANDROID_NDK_HOME=$(pwd)/${NDK_VERSION}
export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH

# Navigate to the OpenSSL directory
cd ${OPENSSL_VERSION}

# Create output directory structure
OUTPUT_DIR="../openssl-build"
mkdir -p ${OUTPUT_DIR}/include/openssl

# Build OpenSSL for each specified architecture
for ARCH in "${ANDROID_ARCHS[@]}"; do
    case $ARCH in
        arm)
            TARGET="android-arm"
            ARCH_DIR="armeabi-v7a"
            ;;
        arm64)
            TARGET="android-arm64"
            ARCH_DIR="arm64-v8a"
            ;;
        x86)
            TARGET="android-x86"
            ARCH_DIR="x86"
            ;;
        x86_64)
            TARGET="android-x86_64"
            ARCH_DIR="x86_64"
            ;;
        *)
            echo "Unknown architecture: $ARCH"
            exit 1
            ;;
    esac

    echo "Building OpenSSL for ${ARCH}..."

    # Configure and build
    ./Configure $TARGET -D__ANDROID_API__=${ANDROID_API}
    make -j$(nproc)

    # Install the built OpenSSL libraries and includes
    ARCH_OUTPUT_DIR="${OUTPUT_DIR}/libs/${ARCH_DIR}"
    mkdir -p ${ARCH_OUTPUT_DIR}

    cp libcrypto.a libssl.a ${ARCH_OUTPUT_DIR}

    # Copy headers only once
    if [ ! "$(ls -A ${OUTPUT_DIR}/include/openssl)" ]; then
        cp -r include/openssl/* ${OUTPUT_DIR}/include/openssl/
    fi

    # Clean up for the next build
    make clean
done

echo "OpenSSL build completed successfully."