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.NET - HASHIDS
Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers. It converts numbers like 347 into strings like “yr8”, or array of numbers like into “3kTMd”. You can also decode those ids back..NET - HASHIDS
Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers. It converts numbers like 347 into strings like “yr8”, or array of numbers like into “3kTMd”. You can also decode those ids back..NET - HASHIDS
Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers.. It converts numbers like 347 into strings like “yr8”, or array of numbers like into “3kTMd”. You can also decode those ids back. .NET - HASHIDSC# GENERATE UNIQUE INTC# GENERATE UNIQUE NUMBERGOLANG SHORT IDJAVA SHORT IDPYTHON SHORT IDSHORT GUID Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers.. It converts numbers like 347 into strings like “yr8”, or array of numbers like into “3kTMd”. You can also decode those ids back. .NET - HASHIDSC# GENERATE UNIQUE INTC# GENERATE UNIQUE NUMBERGOLANG SHORT IDJAVA SHORT IDPYTHON SHORT IDSHORT GUID Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers.. It converts numbers like 347 into strings like “yr8”, or array of numbers like into “3kTMd”. You can also decode those ids back..NET - HASHIDS
Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers.. It converts numbers like 347 into strings like “yr8”, or array of numbers like into “3kTMd”. You can also decode those ids back.HASHIDS
Generate short unique ids from integers ------------------------- available in JavaScript , Ruby , Python , Java , Scala , PHP , Perl , Perl 6 , Swift , Clojure , Objective-C , C , C++11 , D , F# , Go , Erlang , Lua , Haskell , OCaml , Elixir , Rust , Smalltalk , ColdFusion , Kotlin , Nim , VBA , Haxe , Crystal , Elm , ActionScript , Bash , R , TSQL , PostgreSQL , PLpgSQL , Dart , Io , Julia and for .NET Hashids is a small open-source library that generates short, unique, non-sequential ids from numbers. It converts numbers like 347 into strings like “yr8”, or array of numbers like into “3kTMd”. You can also decode those ids back. This is useful in bundling several parameters into one or simply using them as short UIDs. __ check out the demo Are you also using Hashids? Add your project.*
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JAVASCRIPT VERSION
var hashids = new Hashids("this is my salt"), id = hashids.encode(1, 2, 3), numbers = hashids.decode(id);__ github repo
__ download
Implemented by Bazyli Brzóska — https://github.com/niieani/hashids.jsAlso check out:
* NPM package
* Bower package
FEATURES
* Create short unique ids from numbers (positive numbers & zero). * Allow custom alphabet as well as salt — so ids are unique only toyou.
* Incremental input is mangled to stay unguessable. * Code is tiny (~350 lines), fast and does not depend on externallibraries.
HOW DOES IT WORK?
Hashids works similarly to the way integers are converted to hex, but with a few exceptions: * The alphabet is not base16, but base base62 by default. * The alphabet is also shuffled based on salt. This JavaScript function shows regular conversion of integers to hex. It's part of Hashids (although this is a modified example): JavaScriptfunction toHex(input) {var hash = "",
alphabet = "0123456789abcdef", alphabetLength = alphabet.length;do {
hash = alphabet + hash; input = parseInt(input / alphabetLength, 10);} while (input);
return hash;
}
read more
If we try to convert integer 1234 to hex with toHex(1234), we will getback "4d2".
If we increase the alphabet to abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890, our output will now be shorter because there's more characters to work with — so it becomes "t5". If we take it one step further and shuffle the alphabet before encoding, we will get a different value. But how could we shuffle the alphabet consistently, so that with every shuffle the characters would keep the same order? That's where Hashids uses a variation of Fisher-Yates algorithm:
JavaScriptfunction consistentShuffle(alphabet, salt) { var integer, j, temp, i, v, p; for (i = alphabet.length - 1, v = 0, p = 0; i > 0; i--, v++) {v %= salt.length;
p += integer = salt.charCodeAt(0); j = (integer + v + p) % i;temp = alphabet;
alphabet = alphabet.substr(0, j) + alphabet + alphabet.substr(j + 1); alphabet = alphabet.substr(0, i) + temp + alphabet.substr(i + 1);}
return alphabet;
}
The code above might look complicated, but it does one simple thing — shuffles the alphabet based on user's salt. That way when one user passes the salt "abc1", our alphabet becomes cUpI6isqCa0brWZnJA8wNTzDHEtLXOYgh5fQm2uRj4deM91oB7FkSGKxvyVP3l And when another user passes "abc2", the alphabet becomes tRvkhHx0ZefcF46YuaAqGLDKgM1W5Vp2T8n9s7BSoCjiQOdrEbJmUINywzXP3l You can see that the shuffle is pretty good even when salt value is not that much different. This is what makes the base of Hashids work. Now we are able to encode one integer based on the salt value the userprovides.
But Hashids is able to encode several integers into one id. This is done by reserving a few characters from the alphabet as _separators_. These characters are not used in encoding, but instead do the job of purely separating the real encoded values. Let's say we encoded _1, 2, 3_ without the salt and got "o2fXhV". Actual values in this output are highlighted: _o2fXhV_. Letters "f" and "h" are simply used as separators. Letter "o" in this case is reserved for another type of job - it acts as a _lottery_ character to randomize incremental input. If we encode numbers as we increment them, the output is somewhat predictable:Input
Output
1, 2, 3
2fXhV
1, 2, 4
2fXhd
1, 2, 5
2fXh6
1, 2, 6
2fXhz
1, 2, 7
2fXhR
So the lottery character is used to do another iteration of consistent shuffle, before starting the actual encoding. The ids then end up looking more random (with a tiny disadvantage of having that extralottery character):
Input
Output
1, 2, 3
o2fXhV
1, 2, 4
pYfzhG
1, 2, 5
qxfOhN
1, 2, 6
rkfAhN
1, 2, 7
v2fWhy
This is a quick overview of how Hashids is structured. Decoding is done the same way but in reverse — of course in order for that to work, Hashids itself needs the salt value from you in order to decodeids correctly.
If you give Hashids the wrong salt and it just so happens that it decodes back to some random integers, Hashids does a quick check by encoding those integers to be sure the initial id matches. If it does not, the integers are discarded.#%@&$!!11
bouncercat awesomed by cameronmcefee We need ids to be nice and friendly especially if they end up being inthe URL.
Therefore, the algorithm tries to avoid generating most common English curse words by never placing the following letters (and their uppercase equivalents) next to each other:c, s, f, h, u, i, t
This is done by using them as separators. ARE THERE ANY ALTERNATIVES? Yes, there are a few and you should pick the most appropriate for the job. Hashids is not perfect for everything. * _Base64 encode_. This is the most straightforward approach — most languages have these functions. If you don't need all the fancy extras Hashids has to offer, this method will work just fine. It'll probably be faster too. Read more . * _Generate ids based on timestamp_. If you can afford certain degree of collisions, you could compose an id that's built on the fly. Use a counter (if you have one) + timestamp (even better if in milliseconds) + some system value (either an IP address or some machine id) + a random integer. Many big companies implement this approach because it works well in distributed systems. These ids are generated independently of each other and the risk of collisions is so tinyit's negligible.
* _If you need your ids to consist of only numbers_, check out Optimus. It's based on Knuth's integer hash method and produces obfuscated integer ids (and does it faster too). There are PHPand Go
implementations.
* _Nano ID_. Check out Nano ID , it's available for several languages as well. * _Check out how others do it:_ - How does Instagram generate ids?WHAT NOT TO DO
* _Do not try to encode negative numbers_. It won't work. The library currently supports only positive numbers and zero. If you're trying to use numbers as flags for something, simply designate the first _N_ number of digits as internal flags. * _Do not encode strings_. We've had several requests to add this feature — "it seems so easy to add". We will not add this feature for security purposes, doing so encourages people to encode sensitive data, like passwords. This is the wrong tool for that. * _Do not encode sensitive data_. This includes sensitive integers, like numeric passwords or PIN numbers. This is _not a true encryption algorithm_. There are people that dedicate their lives to cryptography and there are plenty of more appropriate algorithms: bcrypt, md5
, aes
, sha1
, blowfish
. Here's a full list.
COLLISIONS
There are no collisions because the method is based on integer to hex conversion. As long as you don't change constructor arguments midway, the generated output will stay unique to your salt. Additionally, we encourage you to pre-generate a large number of ids for testing purposes — to analyze their uniqueness, whether they look random enough for your project and what your upper integer limit is (which usually depends on your system/language). Please note that generated ids are _case-sensitive_ by default ("Aaa" is not the same id as "aaa").WHY "HASHIDS"?
Originally the project referred to generated ids as _hashes_, and obviously the name hashids has the word _hash_ in it. Technically, these generated ids cannot be called hashes since a cryptographic hash has one-way mapping (cannot be decrypted). However, when people search for a solution, like a "youtube hash" or "bitly short id", they usually don't really care of the technical details. So _hashids_ stuck as a term — an algorithm to obfuscatenumbers.
DECODING WITHOUT SALT Do you have a question or comment that involves "security" and "hashids" in the same sentence? _Don't use Hashids_. Here are someways to decode:
* Use a brute-force attack. These ids are
short, get a big dictionary and this shouldn't be too hard. * Use an even faster method with this blog post.
HOW TO CONTRIBUTE
If you've found a bug, please open a github issue in the appropriate repository. Bonus points if you submit a pull request with it. If an implementation in your favorite language is missing, feel free to port it over from one of the existing versions. There's still plenty of languages to contribute in: Nu ,Groovy , Racket ,
Scheme ,
Tcl , Dylan , Lolcode, Factor?
We try to keep the library versions compatible. If you see an outdated version in an existing implementation, please open a github issue in that repository — show your +1 support for that issue. codercat by cameronmcefee ARE YOU USING HASHIDS? Whether it's an open-source project or a commercial product, tell usat
https://github.com/hashids/hashids.github.io/wiki/Who's-Using-Hashids!
HASHIDS ELSEWHERE
If you have a question about Hashids, a lot has already been answered. Try checking one of these:* __ StackOverflow
* __ Twitter
MAINTAINERS
Many thanks to the numerous folks that have implemented the different versions, plugins, extensions as well as to those that have suggested general improvements.*
REMI GILLIG
Go
*
PETER HELLBERG
Ruby
*
DAVID AURELIO
Python
*
MARKUS ULLMARK
.NET
*
ZAK B. ELEP
Perl
*
LEIF HÖGBERG
Lua
*
FANWEIXIAO
Java
*
ALEXEI SHOLIK
Elixir
*
DAN G. SWITZER, II
ColdFusion
*
TOON SCHOENMAKERS
C++11
*
JOHN KY
Scala
*
LATCHEZAR TZVETKOFF
C
*
DENIS KOROLEV
Kotlin
*
ADAM CHESAK
Nim
*
TROY MOREHOUSE
VBA
*
MATEUSZ MAŁCZAK
Swift
*
JASON STRUTZ
Clojure
*
LEE GITACK
Erlang
*
CHAR SYAM
Rust
*
JOHANNES HILDÉN
Haskell
*
JOVAN NIKOLIĆ
ActionScript
*
BEN WILBER
Bash
*
ALEX SHUM
R
*
VIKING EDSTRÖM
D
*
ROB BERTELS
F#
*
WAYNE BLOSS
TSQL
*
KEVIN LEUNG
Haxe
*
PETRE DAMOC
Elm
*
ALAN CAPEWELL
Smalltalk
*
CARL D. BENSON
Objective-C
*
BAHTIAR GADIMOV
Perl 6
*
PETER LEITZEN
Crystal
*
VINCENT KLAIBER
PHP
*
VAHAGN MKRTCHYAN
PostgreSQL
*
VINCENT JACQUES
OCaml
*
OLEKSANDR LEUSCHENKODart
*
KENNETHAN CEYER
Io
*
ROBERT HUX
PLpgSQL
*
GOTOH SHUNSUKE
Julia
*
BAZYLI BRZÓSKA
JavaScript
LICENSE
All hashids libraries are under MIT license . You can use them in open source projects and commercial products. Don't break the Internet. Kthxbye. Hashids is under MIT license Website © Hashids 2021 · GithubIssues
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