Crate chacha20poly1305_nostd 

ChaCha20-Poly1305 Authenticated Encryption with Associated Data (AEAD)

Pure-Rust implementation combining:

• ChaCha20 stream cipher (encryption)
• Poly1305 MAC (authentication)

This is a custom implementation to avoid LLVM SIMD issues on x86_64-unknown-none.

Properties:

• 256-bit key, 96-bit nonce
• 128-bit authentication tag
• Constant-time operations
• ~4 cycles/byte on modern x86_64

Used by:

• WireGuard: Transport data encryption
• SSH: chacha20-poly1305@openssh.com cipher

Structs

ChaCha20Poly1305

ChaCha20-Poly1305 AEAD cipher

Enums

CryptoError

Cryptographic error types

Constants

CHACHA20_KEY_SIZE

Key size for ChaCha20-Poly1305 (32 bytes)

CHACHA20_NONCE_SIZE

Nonce size for ChaCha20-Poly1305 (12 bytes)

POLY1305_TAG_SIZE

Authentication tag size (16 bytes)

Type Aliases

CryptoResult