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crypto.randomFillSync() Method in Node.js
The crypto.randomFillSync() method takes a buffer argument and returns the buffer by filling it with its encrypted value. As the name suggests, this will be a sync process.
Syntax
crypto.randomFillSync(buffer, [offset], [size])
Parameters
The above parameters are described as below −
buffer – This field contains the data content. Possible buffer types are: string, TypedArray, Buffer, ArrayBuffer, DataView. The size of the buffer cannot be greater than 2**31-1.
offset – The value of the offset from where randomFill will start. Default value is 0.
size – The size of the buffer after the offset, i.e., (buffer.length-offset). This value cannot be greater than 2**31-1.
Example
Create a file with name – randomFillSync.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −
node randomFillSync.js
randomFillSync.js
// crypto.randomFillSync() Example Demo // Importing the crypto module const crypto = require('crypto'); // Defining buffer length const buffer = Buffer.alloc(15); // Buffer console.log(crypto.randomFillSync(buffer).toString('base64')); // Buffer and Offset crypto.randomFillSync(buffer, 4); console.log(buffer.toString('base64')); // Buffer, offset and size crypto.randomFillSync(buffer, 4, 4); console.log(buffer.toString('base64'));
Output
C:\home
ode>> node randomFillSync.js wVBZ+i/nvmL3Ce4kBOl0 wVBZ+hkP5DB/4Ci8yTGs wVBZ+stVWJZ/4Ci8yTGs
Example
Let's take a look at one more example.
// crypto.randomFillSync() Example Demo // Importing the crypto module const crypto = require('crypto'); // Creating TypedArray instance i.e, Int8Array const data = new Int8Array(16); // Buffer, offset and size console.log(Buffer.from(crypto.randomFillSync(data).buffer, data.byteOffset, data.byteLength).toString('base64')); console.log(); // Creating a TypedArray instance i.e, BigInt64Array const data2 = new BigInt64Array(4); console.log(Buffer.from(crypto.randomFillSync(data2).buffer, data2.byteOffset, data2.byteLength).toString('ascii')); console.log(); // Creating a DataView instance const data3 = new DataView(new ArrayBuffer(7)); console.log(Buffer.from(crypto.randomFillSync(data3).buffer, data3.byteOffset, data3.byteLength).toString('hex'));
Output
C:\home
ode>> node randomFillSync.js iNm8tiwDATcV6I8xjTSTbQ== ra+I=(6&Xse"�hjw?!EO?D#S7M d957fb1dbdfa00