Module crypto 

Cryptographic hash functions with CPU feature detection and optimizations

Provides optimized SHA256 implementations that automatically select the best available implementation based on CPU features:

• AVX2 SIMD (8-way parallel) - fastest on modern CPUs
• SSE4 SIMD (4-way parallel) - fallback for older CPUs
• Generic (sha2 crate with asm) - baseline for all CPUs

The sha2 crate with “asm” feature already includes optimized assembly, but we can add batch processing and CPU feature detection for better performance in batch scenarios.

Modules

avx2_batch

AVX2-optimized batch SHA256 hashing

cpu_features

CPU feature detection for runtime optimization selection

hash_compare

SIMD-optimized hash comparison utilities

int_ops

Optimized integer arithmetic operations for hot paths

sha256_avx2

AVX2-optimized SHA256 implementation

sha_ni

Intel SHA Extensions (SHA-NI) optimized SHA256

simd_bytes

SIMD-optimized byte array operations

Structs

OptimizedSha256

Optimized SHA256 hasher with CPU feature detection

Functions

hash256

Convenience function for double SHA256 hash (Bitcoin standard)

sha256

Convenience function for single SHA256 hash