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for artifact in $(find . -type f -name '*.tar.gz');

do
  echo $artifact;
  echo  " Generating ASCII armored GPG signature "
  gpg -a -b --digest-algo=SHA512 ${artifact};

  echo  " Generating sha512 sum hash "
  gsha512sum  ${artifact} |  cut -d" " -f1 > ${artifact}.sha512

  echo  " Generating sha256 sum hash "
  gsha256sum  ${artifact} |  cut -d" " -f1 > ${artifact}.sha256

done

1. 1. ASCII armored GPG signatures (--digest-algo=SHA512 select the SHA512 hash algorithm). Configure GPG to always prefer stronger hashes.
      $ gpg -a -b --digest-algo=SHA512 nifi-minifi-cpp-${MINIFI_VERSION}-source.tar.gz    # produces nifi-minifi-cpp${MINIFI_VERSION}-source.tar.gz.asc
      $ gpg -a -b --digest-algo=SHA512 nifi-minifi-cpp-${MINIFI_VERSION}-bin.tar.gz          # produces nifi-minifi-cpp-${MINIFI_VERSION}-bin.tar.gz.asc
      $ gpg -a -b --digest-algo=SHA512 nifi-minifi-cpp-${MINIFI_VERSION}-bin.tar.gz          # produces nifi-minifi-cpp-${MINIFI_VERSION}-bin.tar.gz.asc
   2. Generate SHA256 hash summaries.
      $ shasum -a 256 nifi-${MINIFI_VERSION}-source-release.zip | cut -d" " -f1 >  nifi-${MINIFI_VERSION}-source-release.zip.sha256
      $ shasum -a 256 nifi-${MINIFI_VERSION}-bin.tar.gz | cut -d" " -f1 >  nifi-${MINIFI_VERSION}-bin.tar.gz.sha256
      $ shasum -a 256 nifi-${MINIFI_VERSION}-bin.zip | cut -d" " -f1 >  nifi-${MINIFI_VERSION}-bin.zip.sha256
   3. Generate SHA512 hash summaries.
      $ sha512sum nifi-${MINIFI_VERSION}-source-release.zip | cut -d" " -f1 >  nifi-${RELEASAE}-source-release.zip.sha512
      $ sha512sum nifi-${MINIFI_VERSION}-bin.tar.gz | cut -d" " -f1 >  nifi-${RELEASAE}-bin.tar.gz.sha512
      $ sha512sum nifi-${MINIFI_VERSION}-bin.zip | cut -d" " -f1 >  nifi-${RELEASAE}-bin.zip.sha512
2. For reviewing of the release candidate, commit the source release and convenience binaries files along with their hashes and signatures to  https://dist.apache.org/repos/dist/dev/nifi/nifi-minifi-cpp/${VERSION}

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