multihash/README at master · thingless/multihash · GitHub

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TODO

binary  checksum        where is it used
4       magic bytes
2       version number
2       self length
1       flags           # currently two flags: it's a literal, signature follows
8       length
4       sum32
4       crc-32          #
8       crc-64          #
32      BLAKE2s         # librsync 1.0+ strong checksum
64      BLAKE2b         # maybe IPFS uses this
16      MD4             # librsync 0.9- strong checksum
16      MD5             # md5sum
20      ripemd160       # bitcoin uses it
20      SHA-1           # shasum
32      SHA-256         #
64      SHA-512         #
32      SHA-3-256       # no one uses SHA-3
64      SHA-3-512       # no one uses SHA-3
64      whirlpool       #
4       XXH32           #
8       XXH64           # no one really uses it but it's fast to calculate
4       <custom>        rsync's rolling checksum [https://github.com/librsync/librsync/blob/master/src/rollsum.h]
20      <custom>        git's blob storage SHA
20      <custom>        first chunk of torrent file (zero-padded if needed) - 256K
20      <custom>        first chunk of torrent file (zero-padded if needed) - 512K
20      <custom>        first chunk of torrent file (zero-padded if needed) - 1M

--
20      signing PGP key fingerprint
1024-4096 public key
200-500 signature