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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →A Git object ID is not always 40 characters. Forty hexadecimal digits is the full SHA-1 form; Git’s SHA-256 repository format uses 64. If your code validates, stores, prints, or slices IDs as though they must be 40 characters long, it can reject valid IDs or silently lose information. Make the repository’s object format—not a hard-coded length—the basis of your handling.
Why is my Git commit hash longer than 40 characters?
Git names objects by hashing their data. In the traditional SHA-1 format, a full object name is 40 hexadecimal digits. In the SHA-256 repository format documented by Git, it is 64 hexadecimal digits. The 40-character rule is therefore true for full SHA-1 object names, not for every Git repository format. Git’s hash-function transition documentation describes both formats.
A commit is one of Git’s object types, alongside trees, blobs, and tags; each is named by an object ID. The format issue is not unique to commit IDs. Git’s index format documentation likewise specifies that object IDs and checksums use SHA-1 in traditional repositories and SHA-256 in SHA-256 repositories.
Does Git use 64-character commit hashes?
Yes, in a SHA-256-format repository, a full object name is represented with 64 hexadecimal digits. That does not mean every Git command or integration accepts every spelling in the same way: Git’s transition design describes modes in which input and output may use SHA-1 names, SHA-256 names, or both. Check the contract of the specific command or API you use rather than assuming its displayed spelling is a universal interface. The transition documentation explains these modes.
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Also distinguish a full object ID from an abbreviation. Git can resolve a leading substring when it uniquely identifies an object in that repository. The required abbreviation length is therefore not a universal fixed value, and a short ID copied from a log is not the full object name. See Git’s revision documentation.
Where hard-coded lengths cause problems
- Validation: a 40-character regular expression can reject a valid full SHA-256 object ID.
- Storage and transport: fixed-width fields or serialization formats sized for SHA-1 can truncate or fail to preserve a longer ID.
- Formatting: slicing an ID to 40 characters discards part of a SHA-256 name; treating a shortened display string as a full ID also confuses two distinct forms.
- Repository parsers: assumptions about object IDs can affect index and checksum parsing, not just strings shown to users.
Git’s transition plan specifically calls for avoiding hard-coded raw-byte and hexadecimal lengths of 20 and 40 in favor of abstractions such as struct object_id, GIT_MAX_RAWSZ, and GIT_MAX_HEXSZ. These are guidance for Git code; when integrating through another language or service, use that interface’s documented object-ID and format-aware facilities. The transition plan gives the implementation direction.
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How to make code support SHA-256 Git repositories
- Identify what the value represents. Determine whether it is a full object ID, a deliberately abbreviated display value, or an unrelated identifier. Do not change validation just because a string happens to be 40 characters.
- Use format-aware Git abstractions. In Git code, use the object-ID type and size-aware constants rather than fixed 20-byte or 40-character buffers. In an integration, prefer APIs that report or handle the repository’s object format.
- Preserve the complete ID. Keep full identifiers intact in storage and transport. If you shorten for display, do so only where Git semantics permit it and ensure the abbreviation is unambiguous in the relevant repository.
- Review every boundary. Check command options, APIs, serialized data, CI variables, database schemas, and external services. Git’s documented formats do not establish what every third-party system accepts.
- Test both repository formats. Exercise parsing, output, persistence, and comparisons with SHA-1 and SHA-256 repositories. This is a practical test strategy based on Git’s documented format differences, not a claim that a particular test suite has been run.
What to compare when reviewing an integration
| Review question | What to establish |
|---|---|
| Which object formats are accepted? | Whether the integration handles SHA-1, SHA-256, or both, according to its own documented contract. |
| Which input forms are accepted? | Whether it expects full IDs, unique abbreviations, or both. Git’s ability to resolve an abbreviation does not guarantee another interface accepts one. |
| Which form is emitted? | Whether output is SHA-1 or SHA-256, and whether the format can be selected or depends on the repository or command mode. |
| Are IDs preserved end to end? | Whether storage and transmission retain the entire identifier instead of truncating it to a legacy width. |
| Are repository-data lengths derived correctly? | Whether parsers account for the selected format in structures such as the Git index. |
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