Zero-byte SHA256 · Known answer
A file with zero bytes has a defined SHA-256 checksum. No file selected is a different state.
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SHA256 · 0 bytes · no HMAC. Empty input is not the same as no file selected.
SHA256 Onlinee3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855The documented digest is calculated over an empty byte sequence. It is not the digest of a space, a newline, a byte with value zero, or the word empty. A new text file can contain a byte-order mark or an automatically inserted newline; check its byte length.
Choose Try empty file to calculate this result locally and compare it against the published value. This is an example file, not a verification of your own file.
On macOS or Linux, the command below passes no bytes to shasum. To check a saved file instead, run shasum -a 256 followed by its local path. The result must have 64 hex characters.
printf '' | shasum -a 256SHA-256 includes padding and the original message length as part of its definition. Even an input with no data bytes therefore produces a full 256-bit result. The algorithm is specified in NIST FIPS 180-4.
Do not trim or decode a real file before hashing it. The file workbench reads its exact bytes; the expected-digest field only ignores outer whitespace and letter case. A checksum match needs a trusted expected value to be useful.
It is e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855. This is the digest of zero bytes, not of the word empty.
No. No selection means nothing has been read. Try empty file creates a local zero-byte example and compares its result.
It may contain a byte-order mark or a final newline. Check the saved byte length rather than whether the editor looks blank.
No. A zero-valued byte is one byte. Empty input has length zero and contains no bytes of any value.
Use printf '' | shasum -a 256 on a system with shasum. Unlike echo, printf with an empty format adds no newline.
The hash algorithm includes padding and an encoded input length. The defined digest exists even when the original message is empty.
Yes. Each selected file is hashed separately. A zero-byte file is valid; match manifest entries by exact filename as for other files.
No. A supposed installer that is zero bytes is probably not the intended artifact. Compare its expected size and a checksum from the trusted publisher.