Web Crypto: sign/verify

This page shows the use of the sign() and verify() functions of the Web Crypto API. It contains four separate examples, one for each signing algorithm supported:

• "RSASSA-PKCS1-v1_5"
• "RSA-PSS"
• "ECDSA"
• "HMAC"

Each example has four components:

• A text box containing a message to sign.
• A representation of the signature.
• A "Sign" button: this signs the text box contents, displays part of the signature, and stores the complete signature.
• A "Verify" button: this verifies the text box contents against the stored signature, and styles the displayed signature according to the result.

Try it:

• Press "Sign". The signature should appear.
• Press "Verify". The signature should be styled as valid.
• Edit the text box contents.
• Press "Verify". The signature should be styled as invalid.