Use shasum --check on macOS

It expects exactly two spaces separating digests from filenames. Nudge it towards succeess by making it so.

scripts/build.sh

@@ -23,16 +23,12 @@ if [[ ! -f "${BUILD_ROOT_DIR}/openssl-${OPENSSL_VERSION}.tar.gz" ]]; then
   echo "Downloading openssl-${OPENSSL_VERSION}.tar.gz"
   curl -fL "https://github.com/openssl/openssl/releases/download/openssl-${OPENSSL_VERSION}/openssl-${OPENSSL_VERSION}.tar.gz" -o "${BUILD_ROOT_DIR}/openssl-${OPENSSL_VERSION}.tar.gz"
   curl -fL "https://github.com/openssl/openssl/releases/download/openssl-${OPENSSL_VERSION}/openssl-${OPENSSL_VERSION}.tar.gz.sha256" -o "${BUILD_ROOT_DIR}/openssl-${OPENSSL_VERSION}.tar.gz.sha256"
-  DIGEST_EXPECTED=$( cat "${BUILD_ROOT_DIR}/openssl-${OPENSSL_VERSION}.tar.gz.sha256" | awk '{ print " "$1}' )
-  DIGEST_ACTUAL=$( shasum -a 256 "${BUILD_ROOT_DIR}/openssl-${OPENSSL_VERSION}.tar.gz" | awk '{ print " "$1}' )
-
-  if [[ "${DIGEST_EXPECTED}" != "${DIGEST_ACTUAL}" ]]; then
-    echo "openssl-${OPENSSL_VERSION}.tar.gz: checksum mismatch"
-    echo "expected: ${DIGEST_EXPECTED}"
-    echo "found:    ${DIGEST_ACTUAL}"
-    exit 1
-  fi
-  rm -f "${BUILD_ROOT_DIR}/openssl-${OPENSSL_VERSION}.tar.gz.sha256"
+
+  # `shasum --check` expects exactly two spaces separating digest and filename on macOS -- help it succeed
+  pushd "${BUILD_ROOT_DIR}"
+  sed -e 's/ /  /g' "openssl-${OPENSSL_VERSION}.tar.gz.sha256" > "openssl-${OPENSSL_VERSION}.tar.gz.sha256-macOS"
+  shasum -a 256 --strict --check "openssl-${OPENSSL_VERSION}.tar.gz.sha256-macOS"
+  popd
 fi
 
 BUILD_DIR="${BUILD_ROOT_DIR}/openssl-${OPENSSL_VERSION}"