git-secure-tag
Why?
git uses SHA-1 hashes when signing tag. SHA-1 is generally deprecated and is
not a collision-safe anymore (though, collisions are yet to come pre-image attack is yet to come).
How?
git-secure-tag runs cat-file recursively for each
entry (sorted alphabetically), enters submodules (if present), and hashes
file/directory names, file contents, and submodules (recursively again) into a
resulting Git-EVTag-v0-SHA512: ... SHA512 digest.
Installation
npm install -g git-secure-tagUsage
# Sign
git secure-tag v1.2.7 -m "My tag annotation"
# Verify
git secure-tag -v v1.2.7Original evtag implementation
Largely inspired by:
https://github.com/cgwalters/git-evtag
LICENSE
This software is licensed under the MIT License.
Copyright Fedor Indutny, 2016.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.