Details about SHA1
Gentoo Mono Handbook
How to obtain source code from GitHub?
,
sha1 is described in
RFC 3174
(
https://tools.ietf.org/html/rfc3174
),
The usage of sha1 in git is described in
https://illustrated-git.readthedocs.org/en/latest/
with examples and .svg illustrations
Git References -
https://git-scm.com/book/tr/v2/Git-Internals-Git-References
the files that contain the SHA-1 values in the .git/refs directory.