SubtleCrypto

A low-level browser API providing hardware-accelerated cryptographic primitives for secure web applications.

SubtleCrypto is the core interface of the Web Crypto API, granting developers direct access to high-performance cryptographic operations like AES-GCM encryption, SHA-256 hashing, and ECDSA digital signatures. It handles sensitive tasks (key generation, derivation, and storage) within a secure environment, ensuring raw private keys remain inaccessible to main-thread JavaScript. By leveraging native browser implementations, it replaces slow, insecure user-land libraries with standardized, audited code capable of processing megabytes of data per second.

https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto