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zeroprobe
Asked: 2014-11-11 04:16:31 +0800 CST

How to generate Amazon Glacier SHA-256 Tree Hash for a file locally?

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To verify my files have uploaded correctly, is there a tool to generate the Amazon Glacier Tree Hash SHA-256 for files locally?

amazon-glacier

4 Answers

  1. boto has a utility function to do this.

    Here's a wrapper script to turn it into a command line tool

    #!/usr/bin/env python

import os
import sys
import argparse
import boto

from boto.glacier.utils import compute_hashes_from_fileobj

parser = argparse.ArgumentParser(description='compute amazon tree hashes of files')
parser.add_argument("--quiet", "-q", action='store_true')
parser.add_argument("filename", nargs='+')
args = parser.parse_args()

for filename in args.filename:
    with open(filename, 'r') as f:
        sha, tree = compute_hashes_from_fileobj(f)
        if args.quiet:
           print tree
        else:
            print filename + ":", tree
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  2. Sorted, I made a quick Windows tool from Amazons own source to compute the hash.

    https://mega.co.nz/#!HBMQ0ZSL!l0p0AamSpoFxKwDtJU03_uTi9t9hJ-6EVURmOSXSP3Y

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  3. Glacier documentation provides a sample code to compute SHA256 tree hash.

    I've built a Docker image to run this sample code. You can use it to compute SHA256 tree hash for multiple files:

    docker run -it --rm -v `pwd`:/app ggarnier/glacier-sha256-tree-hash:latest <file1> <file2> ...

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  4. There is a bash script implementation using openssl here: https://github.com/numblr/glaciertools

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