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verify

The verify() operation verifies a digital signature. It ensures that some data was signed by a known key and that the data has not been tampered with since it was signed.

Usage

verify(algorithm, key, signature, data)

Parameters

NameTypeDescription
algorithmstring or object with a single name string property or an EcdsaParams, or HmacKeyGenParams objectThe algorithm to use. Currently supported: HMAC and ECDSA.
keyCryptoKeyThe key that will be used to verify the signature.
signatureArrayBufferThe signature to verify.
dataArrayBufferThe data whose signature is to be verified.

Supported algorithms

ECDSAHMACRSASSA-PKCS1-v1_5RSA-PSS
EcdsaParamsHmacKeyGenParams

Return Value

A Promise that resolves to a boolean value indicating if the signature is valid.

Throws

TypeDescription
InvalidAccessErrorRaised when the key either does not support the verify operation, or is incompatible with the selected algorithm.

Examples

Verifying an HMAC signature

JavaScript
import { crypto } from 'k6/experimental/webcrypto';

export default async function () {
  const generatedKey = await crypto.subtle.generateKey(
    {
      name: 'HMAC',
      hash: { name: 'SHA-1' },
    },
    true,
    ['sign', 'verify']
  );

  const data = string2ArrayBuffer('Hello World');

  /**
   * Signes the encoded data with the provided key using the HMAC algorithm
   * the returned signature can be verified using the verify method.
   */
  const signature = await crypto.subtle.sign('HMAC', generatedKey, data);

  /**
   * Verifies the signature of the encoded data with the provided key using the HMAC algorithm.
   */
  const verified = await crypto.subtle.verify('HMAC', generatedKey, signature, data);

  console.log('verified: ', verified);
}

function string2ArrayBuffer(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;
}

Verifying an ECDSA signature

JavaScript
import { crypto } from 'k6/experimental/webcrypto';

export default async function () {
  const publicKey = await crypto.subtle.importKey(
    'spki',
    spkiPublicKeyData,
    { name: 'ECDSA', namedCurve: 'P-256' },
    true,
    ['verify']
  );

  // Verifies the signature of the encoded data with the provided key
  const verified = await crypto.subtle.verify(
    {
      name: 'ECDSA',
      hash: 'SHA-256',
    },
    publicKey,
    signature,
    plaintText
  );

  console.log('verified: ', verified);
}

const spkiPublicKeyData = new Uint8Array([
  48, 89, 48, 19, 6, 7, 42, 134, 72, 206, 61, 2, 1, 6, 8, 42, 134, 72, 206, 61, 3, 1, 7, 3, 66, 0,
  4, 10, 5, 30, 56, 111, 103, 196, 166, 225, 229, 203, 238, 125, 55, 116, 91, 88, 142, 190, 114, 15,
  117, 89, 22, 40, 111, 150, 41, 105, 122, 57, 23, 17, 216, 106, 234, 201, 103, 8, 210, 58, 38, 35,
  216, 198, 237, 187, 84, 217, 164, 63, 100, 6, 105, 49, 128, 15, 53, 29, 158, 117, 235, 238, 30,
]);

const plaintText = new Uint8Array([
  95, 77, 186, 79, 50, 12, 12, 232, 118, 114, 90, 252, 229, 251, 210, 91, 248, 62, 90, 113, 37, 160,
  140, 175, 231, 60, 62, 186, 196, 33, 119, 157, 249, 213, 93, 24, 12, 58, 233, 148, 38, 69, 225,
  216, 47, 238, 140, 157, 41, 75, 60, 177, 160, 138, 153, 49, 32, 27, 60, 14, 129, 252, 71, 202,
  207, 131, 21, 162, 175, 102, 50, 65, 19, 195, 182, 98, 48, 195, 70, 8, 196, 244, 89, 54, 52, 206,
  2, 178, 103, 54, 34, 119, 240, 168, 64, 202, 116, 188, 61, 26, 98, 54, 149, 44, 94, 215, 170, 248,
  168, 254, 203, 221, 250, 117, 132, 230, 151, 140, 234, 93, 42, 91, 159, 183, 241, 180, 140, 139,
  11, 229, 138, 48, 82, 2, 117, 77, 131, 118, 16, 115, 116, 121, 60, 240, 38, 170, 238, 83, 0, 114,
  125, 131, 108, 215, 30, 113, 179, 69, 221, 178, 228, 68, 70, 255, 197, 185, 1, 99, 84, 19, 137,
  13, 145, 14, 163, 128, 152, 74, 144, 25, 16, 49, 50, 63, 22, 219, 204, 157, 107, 225, 104, 184,
  72, 133, 56, 76, 160, 62, 18, 96, 10, 193, 194, 72, 2, 138, 243, 114, 108, 201, 52, 99, 136, 46,
  168, 192, 42, 171,
]);

const signature = new Uint8Array([
  83, 223, 63, 226, 42, 29, 106, 105, 225, 145, 197, 180, 118, 154, 109, 110, 66, 67, 47, 251, 53,
  190, 203, 65, 207, 36, 19, 57, 49, 122, 124, 118, 59, 74, 222, 134, 42, 235, 180, 229, 134, 24,
  205, 81, 171, 156, 100, 218, 127, 242, 126, 53, 27, 77, 249, 101, 157, 132, 244, 30, 67, 30, 64,
  12,
]);