The AesCtrParams object represents the object that should be passed as the algorithm parameter into the encrypt and decrypt operation when using the AES-CTR algorithm.
For more details, head to the MDN Web Crypto API documentation on AES-CTR.
Properties
Property
Type
Description
name
string
Should be set to AES-CTR.
counter
ArrayBuffer, TypedArray, or DataView
The initial value of the counter block. This must be 16-bytes long, like the AES block size.
length
number
The number of bits in the counter block that are used for the actual counter. It is recommended to use 64 (half of the counter block).
Example
JavaScript
import{ crypto }from'k6/experimental/webcrypto';exportdefaultasyncfunction(){const plaintext =stringToArrayBuffer('Hello, World!');/**
* Generate a symmetric key using the AES-CTR algorithm.
*/const key =await crypto.subtle.generateKey({name:'AES-CTR',length:256,},true,['encrypt','decrypt']);/**
* Encrypt the plaintext using the AES-CTR key with
* have generated.
*/const ciphertext =await crypto.subtle.encrypt({name:'AES-CTR',counter: crypto.getRandomValues(newUint8Array(16)),length:128,},
key,
plaintext
);}functionstringToArrayBuffer(str){const buf =newArrayBuffer(str.length *2);// 2 bytes for each charconst bufView =newUint16Array(buf);for(let i =0, strLen = str.length; i < strLen; i++){
bufView[i]= str.charCodeAt(i);}return buf;}