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Showing content from https://mdn.github.io/dom-examples/web-crypto/sign-verify/index.html below:

Web Crypto API example

This page shows how to use the sign() and verify() functions of the Web Crypto API. It contains examples for the following signing algorithms:

1. "RSASSA-PKCS1-v1_5"
2. "RSA-PSS"
3. "ECDSA"
4. "HMAC"
5. "Ed25519"
   • Caution: For information about Ed25519 support, see SubtleCrypto: Browser compatibility and Secure Curves in the Web Cryptography API. Chrome requires the enable-experimental-web-platform-features preference to be set via command-line switch or via chrome://flags/#enable-experimental-web-platform-features.

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.

Enter a message to sign:

Signature:

Enter a message to sign:

Signature:

Enter a message to sign:

Signature:

Enter a message to sign:

Signature:

Enter a message to sign:

Signature:

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