Optimized sha256 hash

[mohanson]

No description provided.

[Copilot]

Pull request overview

This PR introduces an optimized SHA-256 hash implementation for RISC-V architecture with various performance optimizations including 64-bit operations, loop unrolling, and Link Time Optimization (LTO).

Key changes:

• New SHA-256 implementation with RISC-V-specific optimizations
• Comprehensive test suite with multiple test cases
• Build system configuration for RISC-V target with LTO enabled

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
opt-lib/sha256/sha256.h	Header file defining SHA-256 API with types and function declarations
opt-lib/sha256/sha256.c	Core SHA-256 implementation with optimizations for RISC-V including 64-bit operations and pragma-based loop unrolling
opt-lib/sha256/main.c	Test suite with 7 test cases covering various input sizes and edge cases
opt-lib/sha256/Makefile	Build configuration for RISC-V target with clang-19 and LTO flags
opt-lib/sha256/README.md	Setup instructions for building dependencies
opt-lib/sha256/.gitignore	Git ignore rules for build artifacts

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