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utils.sha256

Summary

Hash a string using a 256-bit hash

Prototype

s = utils.sha256 (s)


Description

This returns a 256-bit SHA hash (Secure Hash Algorithm) of the string s, which may contain binary zeroes. Unlike the utils.hash function this returns the result as a straight 32-byte (256-bit) field (that is, not converted to printable hex). If you want it in readable form you must then convert it yourself (eg. with utils.tohex).

eg.


print (utils.tohex (utils.sha256 ("nick gammon")))
--> result: B3223193E1C89CB1E42E2BE2DF34874320F43E149DC315A381B08B7BC52849AD


This is a more secure hash than the standard utils.hash algorithm, which returns a 160-bit hash.


See Also ...

Lua functions

utils.activatenotepad - Actvitates the specified notepad window
utils.appendtonotepad - Appends text to the specified notepad window
utils.base64decode - Decode a string which was base-64 encoded
utils.base64encode - Encode a string with base-64 encoding
utils.callbackslist - Returns a table of plugin callback function names
utils.choose - Display a combo box with choices in it
utils.colourcube - Changes the colour cube used by 256-colour ANSI codes
utils.compress - Compress a string
utils.decompress - Decompress a string
utils.directorypicker - Invokes the Windows standard "directory picker" dialog box
utils.editbox - Display a large message box and get free-format reply
utils.edit_distance - Returns the Levenshtein Edit Distance between two words
utils.filepicker - Invokes the Windows standard "file picker" dialog box
utils.filterpicker - Display a dialog box which filters its contents as you type
utils.fontpicker - Invokes the Windows standard "font picker" dialog box
utils.fromhex - Convert a string from hex
utils.functionlist - Returns a table of MUSHclient world function names
utils.getfontfamilies - Returns all fonts available to Windows
utils.glyph_available - Returns the glyph index of a glyph (character) in a font
utils.hash - Hash a string, returning the hex codes
utils.info - Information about directories, locale, etc.
utils.infotypes - Returns a table of all GetInfo type selectors
utils.inputbox - Display a message box and get free-format reply
utils.listbox - Display a dialog box with choices in it in a single selection list box
utils.md5 - Hash a string using the 128-bit MD5 algorithm
utils.menufontsize - Alters the size of the font used in menus
utils.metaphone - Returns metaphones (sound-alike codes) for the supplied word
utils.msgbox - Display a message box and get a response
utils.multilistbox - Display a dialog box with choices in it in a multiple selection list box
utils.readdir - Read a disk directory into a table
utils.reload_global_prefs - Forces global preferences file to be reloaded
utils.sendtofront - Bring a window to the front
utils.shellexecute - Executes a Windows "shell" command
utils.spellcheckdialog - Spell-checker dialog
utils.split - Split a delimited string into a table
utils.timer - Returns the high-resolution timer output
utils.tohex - Convert a string into hex
utils.umsgbox - Display a message box and get a response (Unicode)
utils.utf8convert - Encodes a string into a UTF-8 string
utils.utf8decode - Encodes a series of Unicode codes into a UTF-8 string
utils.utf8encode - Encodes a series of Unicode codes into a UTF-8 string
utils.utf8sub - Returns a substring of a UTF-8 string
utils.utf8valid - Checks if a UTF-8 string is valid
utils.xmlread - Parses an XML string into a nested table

Topics

Lua base functions
Lua bc (big number) functions
Lua bit manipulation functions
Lua coroutine functions
Lua debug functions
Lua io functions
Lua LPEG library
Lua math functions
Lua os functions
Lua package functions
Lua PCRE regular expression functions
Lua script extensions
Lua string functions
Lua syntax
Lua table functions
Lua utilities
Scripting
Scripting callbacks - plugins

(Help topic: lua=utils.sha256)

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Written by Nick Gammon - 5K   profile for Nick Gammon on Stack Exchange, a network of free, community-driven Q&A sites   Marriage equality

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