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minizip-ng/doc/mz_extrafield.md
Nathan Moinvaziri 3da04514cd Remove signing feature. 
Too much work to maintain and rarely used. Continue to use v3 for that feature.
2023-04-09 11:14:26 -07:00

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Extrafields

These are proposals for additional extrafields that are not in the ZIP specification.

Hash (0x1a51)

Size Type Description
2 uint16_t Algorithm
2 uint16_t Digest size
* uint8_t* Digest
Value Description
10 MD5
20 SHA1
23 SHA256

By default, the ZIP specification only includes a CRC hash of the uncompressed content. The Hash extrafield allows additional hash digests of the uncompressed content to be stored with the central directory or local file headers. If there are multiple Hash extrafields stored for an entry, they should be sorted in order of most secure to least secure. So that the first Hash extrafield that appears for the entry is always the one considered the most secure and the one used for signing.

Central Directory (0xcdcd)

Size Type Description
8 uint64_t Number of entries

If the zip entry is the central directory for the archive, then this record contains information about that central directory.