Optimizing TLS Cryptographic Operations on RISC-V SoC with OpenTitan RoT

This work presents a preliminary evaluation of a cryptographic software stack leveraging OpenTitan as a hardware security module within a RISC-V-based system-on-chip. The current implementation supports the TLS_RSA_WITH_AES_256_CBC_SHA256 cipher suite, integrating hardware-accelerated cryptographic operations to enhance security and performance. Through detailed benchmarking, we demonstrate up to 82x speedup for AES-256-CBC and 39x for SHA-256 on larger payload sizes compared to software-only implementations.