Module crypto 

In-tree cryptography (the engine may only link the four ecosystem crates). Implemented from scratch, no_std, unsafe-free, pinned against standard test vectors:

• sha1 — FIPS 180-1 (BitTorrent v1)
• sha256 — FIPS 180-4 (BitTorrent v2 / BEP-52, receipts)
• sha512 — FIPS 180-4 (Ed25519)
• ed25519 — RFC 8032 signatures (provable receipts)
• chacha20 / rng — ChaCha20 CSPRNG (peer ids, DHT ids, nonces)
• hmac_sha256 — HMAC-SHA256 (DHT announce tokens, keyed receipts)

Re-exports

pub use base32::decode as base32_decode;

pub use base32::encode as base32_encode;

pub use base58::decode as base58_decode;

pub use base58::encode as base58_encode;

pub use base64::decode as base64_decode;

pub use base64::encode as base64_encode;

pub use base64::Variant;

pub use md4::Md4;

pub use rng::Rng;

pub use sha1::Sha1;

pub use sha256::Sha256;

pub use sha512::Sha512;

Modules

base32

Base32 codec (RFC 4648), no_std + alloc.

base58

Base58 (Bitcoin/IPFS alphabet) codec, no_std + alloc.

base64

RFC 4648 Base64 codec (no_std, alloc-only): standard alphabet with = padding plus a URL-safe -/_ variant. Unwraps Base64-wrapped Thunder (thunder://), QQ-Xuanfeng (qqdl://) and FlashGet (flashget://) URLs.

chacha20

ChaCha20 stream cipher (RFC 8439, IETF 12-byte nonce variant), the deterministic PRNG core for peer ids, DHT node ids, tokens and transaction ids. Pure no_std, zero unsafe (not used for secrets).

ed25519

Ed25519 (RFC 8032) — pure no_std, zero unsafe, from scratch.

md4

MD4 (RFC 1320), no_std + alloc, for eMule file identification (ed2k://|file|<name>|<size>|<md4>|/). Broken for collision resistance; used only for eMule-link compatibility, never for receipts (those use Ed25519/SHA-256). 64-bit length field (RFC-consistent).

rng

ChaCha20-based deterministic CSPRNG.

sha1

SHA-1 (FIPS 180-1) — required by BitTorrent v1 piece hashing.

sha256

SHA-256 (FIPS 180-4) — required by BitTorrent v2 (BEP-52), receipt content commitment and Merkle helpers. Pure no_std, zero unsafe.

sha512

SHA-512 (FIPS 180-4) — used by Ed25519 (RFC 8032) for key/prefix hashing and message challenges. Pure no_std, zero unsafe.

Functions

hmac_sha256

HMAC-SHA256 (RFC 2104). Used for DHT announce tokens and keyed receipt commitments.