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⚠️ This is the archived documentation for k6 v0.46. Go to the latest version.

SubtleCrypto

The SubtleCrypto interface provides a set of low-level cryptographic primitives such as encryption, decryption, digital signature generation and verification, and key generation and management. It is useful for using secure and efficient cryptographic operations within k6 scripts.

Methods

MethodDescription
encryptEncrypts the given plaintext data using the specified algorithm and key.
decryptDecrypts the given ciphertext data using the specified algorithm and key.
signSigns the given data using the specified algorithm and key.
verifyVerifies the signature of the given data using the specified algorithm and key.
digestComputes the digest (hash) of the given data using the specified algorithm.
generateKeyGenerates a new cryptographic key for use with the specified algorithm.
importKeyImports a raw key material into the Web Crypto API, generating a new key object to use with the specified algorithm.
exportKeyExports the raw key material of the given key object.

Example

example-webcrypto-subtlecrypto.js
import { crypto } from "k6/experimental/webcrypto";
export default async function () {
const plaintext = stringToArrayBuffer("Hello, World!");
/**
* Generate a symmetric key using the AES-CBC algorithm.
*/
const key = await crypto.subtle.generateKey(
{
name: "AES-CBC",
length: 256,
},
true,
["encrypt", "decrypt"]
);
/**
* Encrypt the plaintext using the AES-CBC key with
* have generated.
*/
const iv = crypto.getRandomValues(new Uint8Array(16));
const ciphertext = await crypto.subtle.encrypt(
{
name: "AES-CBC",
iv: iv,
},
key,
plaintext
);
/**
* Decrypt the ciphertext using the same key to verify
* that the resulting plaintext is the same as the original.
*/
const deciphered = await crypto.subtle.decrypt(
{
name: "AES-CBC",
iv: iv,
},
key,
ciphertext,
);
console.log("deciphered text == original plaintext: ", arrayBufferToHex(deciphered) === arrayBufferToHex(plaintext))
}
function arrayBufferToHex(buffer) {
return [...new Uint8Array(buffer)]
.map((x) => x.toString(16).padStart(2, "0"))
.join("");
}
function stringToArrayBuffer(str) {
const buf = new ArrayBuffer(str.length * 2); // 2 bytes for each char
const bufView = new Uint16Array(buf);
for (let i = 0, strLen = str.length; i < strLen; i++) {
bufView[i] = str.charCodeAt(i);
}
return buf;
}