Generating nonces for the ASAP Help Widget
What is a nonce?
Why should you use nonces?
How to generate nonce values?
Nodejs Script:
const var = require( 'crypto' );
var.randomBytes(16).toString( 'base64' );
// '6JDFIvPbrWANKpSJ8vlv6b=='
Java:
String nonce = new String(DigestUtils.md5Hex(String.valueOf(new SecureRandom().nextLong())));
Python Script:
def GetCspNonce():
"""Returns a random nonce."""
NONCE_LENGTH = 16
return base64.b64encode(os.urandom(NONCE_LENGTH))
- Pass the nonce value to the script-src directive of the Content-Security-Policy header (prepend nonce-).
- Pass the same nonce value to the script attribute in the ASAP code snippet.
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