🔐 Web Crypto real cryptographic primitives, no library

The browser ships the same crypto machinery your OS uses — hashing, signing, key generation, AES — hardware-accelerated and audited. "The web isn't systems programming"? The web is the system.

1. Hash any file, locally

Drop a file (or click). It is read and digested on your machine — nothing uploads. This is how you verify a download matches the checksum on a release page.

📄 Drop a file here — any file, any size

2. Digital signatures in four calls

Generate an ECDSA keypair, sign a message with the private key, verify with the public key — then tamper with one character and watch verification fail. This is the trust machinery under HTTPS, passkeys, and JWTs.