BUILT-IN MATHEMATICA SYMBOL
FileHash
FileHash["file"]
gives an integer hash code for the contents of the specified file.
FileHash["file", "type"]
gives an integer hash of the specified type.
- Values generated by FileHash are based on the raw bytes in a file.
- Possible hash code types include:
-
| "Adler32" | Adler 32-bit cyclic redundancy check |
| "CRC32" | 32-bit cyclic redundancy check |
| "MD2" | 128-bit MD2 code |
| "MD5" | 128-bit MD5 code |
| "SHA" | 160-bit SHA-1 code |
| "SHA256" | 256-bit SHA code |
| "SHA384" | 384-bit SHA code |
| "SHA512" | 512-bit SHA code |
- FileHash by default uses 128-bit MD5 code.
- FileHash["file", "type", n] gives the hash code for the first n bytes of the file.
- FileHash["file", "type", -n] gives the hash code for the last n bytes.
- FileHash["file", "type", {m, n}] gives the hash code for bytes m through n.
- FileHash["file", "type", 0] gives the hash code for 0 bytes.
- FileHash works not only on files, but also on streams.
- FileHash[obj, ...] effectively extracts data at the specified range of byte positions in the stream obj, ignoring any previous stream position.
New in 6 | Last modified in 8
