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//! # crypto-async-rs
//!
//! A high-performance, pure Rust cryptographic library providing both synchronous and asynchronous
//! implementations of essential cryptographic primitives. This library focuses on streaming
//! operations and async I/O for optimal performance in modern Rust applications.
//!
//! ## Features
//!
//! ### Core Cryptographic Algorithms
//! - **AES-GCM** (128/192/256-bit) - Authenticated encryption with async streaming support
//! - **ChaCha20-Poly1305** - High-performance AEAD cipher with async operations
//! - **X25519 ECDH** - Elliptic curve Diffie-Hellman key exchange
//! - **SHA Family** - SHA1, SHA224, SHA256, SHA384, SHA512 with async streaming
//! - **HMAC** - Hash-based message authentication codes
//! - **HKDF** - HMAC-based key derivation function
//!
//! ### Key Capabilities
//! - ✅ **Async/Streaming Support** - Process large data without loading into memory
//! - ✅ **High Performance** - Top 5-10% performance compared to industry standards
//! - ✅ **Memory Safe** - Pure Rust implementation with secure memory handling
//! - ✅ **Constant-Time Operations** - Resistant to timing attacks
//! - ✅ **Comprehensive Benchmarks** - Detailed performance analysis and comparisons
//! - ✅ **Production Ready** - Thoroughly tested with RFC compliance
//!
//! ## Quick Start
//!
//! Add to your `Cargo.toml`:
//!
//! ```toml
//! [dependencies]
//! crypto-async-rs = "0.1.1"
//! tokio = { version = "1.0", features = ["full"] }
//! ```
//!
//! ## Example Usage
//!
//! ```rust
//! use crypto_async_rs::ecdh_x25519::{x25519, U_COORDINATE};
//!
//! fn main() -> Result<(), crypto_async_rs::ecdh_x25519::X25519Error> {
//! // Example private keys (in practice, use secure random generation)
//! let alice_private = [
//! 0x77, 0x07, 0x6d, 0x0a, 0x73, 0x18, 0xa5, 0x7d, 0x3c, 0x16, 0xc1, 0x72, 0x51, 0xb2, 0x66, 0x45,
//! 0xdf, 0x4c, 0x2f, 0x87, 0xeb, 0xc0, 0x99, 0x2a, 0xb1, 0x77, 0xfb, 0xa5, 0x1d, 0xb9, 0x2c, 0x2a,
//! ];
//! let bob_private = [
//! 0x5d, 0xab, 0x08, 0x7e, 0x62, 0x4a, 0x8a, 0x4b, 0x79, 0xe1, 0x7f, 0x8b, 0x83, 0x80, 0x0e, 0xe6,
//! 0x6f, 0x3b, 0xb1, 0x29, 0x26, 0x18, 0xb6, 0xfd, 0x1c, 0x2f, 0x8b, 0x27, 0xff, 0x88, 0xe0, 0xeb,
//! ];
//!
//! // Compute public keys
//! let alice_public = x25519(alice_private, U_COORDINATE)?;
//! let bob_public = x25519(bob_private, U_COORDINATE)?;
//!
//! // Perform key exchange
//! let alice_shared = x25519(alice_private, bob_public)?;
//! let bob_shared = x25519(bob_private, alice_public)?;
//!
//! // Both parties now have the same shared secret
//! assert_eq!(alice_shared, bob_shared);
//!
//! println!("Key exchange successful!");
//! Ok(())
//! }
//! ```
//!
//! ## Performance
//!
//! This library achieves **top 5-10% performance** compared to industry-standard cryptographic libraries:
//!
//! - **ChaCha20-Poly1305**: ~359 MiB/s (64KB data)
//! - **AES-256-GCM**: ~253 MiB/s (64KB data)
//! - **X25519 ECDH**: 4,070 ops/sec
//! - **SHA512**: ~393 MiB/s (64KB data)
//!
//! For detailed performance analysis, see the comprehensive benchmark documentation in the `benches/` directory.
//!
//! ## Security
//!
//! - **Constant-Time Operations**: Resistant to timing attacks
//! - **Secure Memory Handling**: Automatic zeroing of sensitive data
//! - **Input Validation**: Comprehensive error handling and validation
//! - **RFC Compliance**: Implements standard algorithms per RFC specifications
//!
//! ## License
//!
//! This project is licensed under the MIT License - see the LICENSE file for details.