Python Integrates Formally Verified Crypto Library HACL*

After 2.5 years of work, Python successfully integrated the formally verified cryptographic library HACL* into its hash and HMAC implementations. This upgrade replaces the previous SHA3 implementation, which contained a CVE, and covers various algorithms including Blake2, SHA3, and HMAC, significantly improving Python's security. The project overcame challenges in implementing streaming APIs and building the system, and also implemented handling of memory allocation failures. This demonstrates the potential of formal verification in large-scale real-world projects.