How to create hash from string in JavaScript ?
In order to create a unique hash from a specific string, it can be implemented using its own string-to-hash converting function. It will return the hash equivalent of a string. Also, a library named Crypto can be used to generate various types of hashes like SHA1, MD5, SHA256, and many more.
These are the following methods to Create Hash from String:
Note: The hash value of an empty string is always zero.
The JavaScript str.charCodeAt() method returns a Unicode character set code unit of the character present at the index in the string specified as the argument. The index number ranges from 0 to n-1, where n is the string’s length.
Syntax:
str.charCodeAt(index)
Example: In this example, we will create a hash from a string in Javascript.
Javascript
function stringToHash(string) {
let hash = 0;
if (string.length == 0) return hash;
for (i = 0; i < string.length; i++) {
char = string.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash;
}
return hash;
}
let gfg = "GeeksforGeeks"
console.log(stringToHash(gfg));
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The crypto.createHash() method is used to create a Hash object that can be used to create hash digests by using the stated algorithm.
Syntax:
crypto.createHash( algorithm, options )
Example: In this example, we will create a hash from a string in Javascript.
javascript
const crypto = require( 'crypto' ),
hash = crypto.getHashes();
x = "Geek"
hashPwd = crypto.createHash( 'sha1' )
.update(x).digest( 'hex' );
console.log(hashPwd);
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Output
321cca8846c784b6f2d6ba628f8502a5fb0683ae
Last Updated :
29 Nov, 2023
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