Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.
Defines the algorithm to use and any extra-parameters. The values given for the extra parameters must match those used in the corresponding [encrypt] call.
The encrypted data to be decrypted (also known as ciphertext).
Return Value
A Promise that resolves to a new ArrayBuffer containing the decrypted data.
Throws
Type
Description
InvalidAccessError
Raised when the requested operation is not valid with the provided key. For instance when an invalid encryption algorithm is used, or a key not matching the selected algorithm is provided.
OperationError
Raised when the operation failed for an operation-specific reason. For instance, if the algorithm size is invalid, or errors occurred during the process of decrypting the ciphertext.
Example
JavaScript
import{ crypto }from'k6/experimental/webcrypto';exportdefaultasyncfunction(){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(newUint8Array(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));}functionarrayBufferToHex(buffer){return[...newUint8Array(buffer)].map((x)=> x.toString(16).padStart(2,'0')).join('');}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;}