refactor(iroh-base)!: reduce dependencies (#3046)

## Description

- ensure `zeroize` is used for `SecretKey`
- remove unused dependencies and features from `iroh-base`

## Breaking Changes

- `iroh_base::SecretKey::generate` now takes an rng
- removed `iroh_base::SecretKey::generate_with_rng`, use `generate`
directly
- removed `iroh_base::SecretKey::to_openssh`
- removed `iroh_base::SecretKey::from_openssh`
- `anyhow::Error` is replaced with explicit errors for
`RelayUrl::from_str`
- `anyhow::Error` is replaced with explicit errors for
`SharedSecret::open`

## Notes & open questions

As a follow up, all usage of `SecretKey::generate` in tests should be
changed to use a seeded rng, like chacha8, instead of `thread_rng`

## Change checklist

- [ ] Self-review.
- [ ] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.
- [ ] Tests if relevant.
- [ ] All breaking changes documented.

iroh-base/Cargo.toml

@@ -15,48 +15,39 @@ rust-version = "1.81"
 workspace = true
 
 [dependencies]
-anyhow = { version = "1", optional = true }
+aead = { version = "0.5.2", features = ["bytes"], optional = true }
+crypto_box = { version = "0.9.1", features = ["serde", "chacha20"], optional = true }
 data-encoding = { version = "2.3.3", optional = true }
+ed25519-dalek = { version = "2.0.0", features = ["serde", "rand_core", "zeroize"], optional = true }
+derive_more = { version = "1.0.0", features = ["display"], optional = true }
+url = { version = "2.5", features = ["serde"], optional = true }
 postcard = { version = "1", default-features = false, features = ["alloc", "use-std", "experimental-derive"], optional = true }
+rand_core = { version = "0.6.4", optional = true }
 serde = { version = "1", features = ["derive"] }
 thiserror = { version = "2", optional = true }
-
-# key module
-aead = { version = "0.5.2", features = ["bytes"], optional = true }
-derive_more = { version = "1.0.0", features = ["debug", "display", "from_str"], optional = true }
-ed25519-dalek = { version = "2.0.0", features = ["serde", "rand_core"], optional = true }
-once_cell = { version = "1.18.0", optional = true }
-rand = { version = "0.8", optional = true }
-rand_core = { version = "0.6.4", optional = true }
-ssh-key = { version = "0.6.0", features = ["ed25519", "std", "rand_core"], optional = true }
 ttl_cache = { version = "0.5.1", optional = true }
-crypto_box = { version = "0.9.1", features = ["serde", "chacha20"], optional = true }
-zeroize = { version = "1.5", optional = true }
-url = { version = "2.5", features = ["serde"], optional = true }
+
 # wasm
 getrandom = { version = "0.2", default-features = false, optional = true }
 
 [dev-dependencies]
 iroh-test = "0.28.0"
+postcard = { version = "1", features = ["use-std"] }
 proptest = "1.0.0"
+rand = "0.8"
 serde_json = "1"
 serde_test = "1"
-postcard = { version = "1", features = ["use-std"] }
+
 
 [features]
 default = ["ticket", "relay"]
 ticket = ["key", "dep:postcard", "dep:data-encoding"]
 key = [
-  "dep:anyhow",
   "dep:ed25519-dalek",
-  "dep:once_cell",
-  "dep:rand",
   "dep:rand_core",
-  "dep:ssh-key",
   "dep:ttl_cache",
   "dep:aead",
   "dep:crypto_box",
-  "dep:zeroize",
   "dep:url",
   "dep:derive_more",
   "dep:getrandom",
@@ -68,7 +59,6 @@ wasm = ["getrandom?/js"]
 relay = [
   "dep:url",
   "dep:derive_more",
-  "dep:anyhow",
   "dep:thiserror",
 ]
 

iroh-base/src/key.rs

@@ -6,20 +6,18 @@ use std::{
     fmt::{Debug, Display},
     hash::Hash,
     str::FromStr,
-    sync::Mutex,
+    sync::{Mutex, OnceLock},
     time::Duration,
 };
 
 pub use ed25519_dalek::Signature;
 use ed25519_dalek::{SignatureError, SigningKey, VerifyingKey};
-use once_cell::sync::OnceCell;
 use rand_core::CryptoRngCore;
 use serde::{Deserialize, Serialize};
-use ssh_key::LineEnding;
 use ttl_cache::TtlCache;
 
-pub use self::encryption::SharedSecret;
 use self::encryption::{public_ed_box, secret_ed_box};
+pub use self::encryption::{DecryptionError, SharedSecret};
 
 #[derive(Debug)]
 struct CryptoKeys {
@@ -48,7 +46,7 @@ const KEY_CACHE_TTL: Duration = Duration::from_secs(60);
 ///
 /// So that is about 4MB of max memory for the cache.
 const KEY_CACHE_CAPACITY: usize = 1024 * 16;
-static KEY_CACHE: OnceCell<Mutex<TtlCache<[u8; 32], CryptoKeys>>> = OnceCell::new();
+static KEY_CACHE: OnceLock<Mutex<TtlCache<[u8; 32], CryptoKeys>>> = OnceLock::new();
 
 fn lock_key_cache() -> std::sync::MutexGuard<'static, TtlCache<[u8; 32], CryptoKeys>> {
     let mutex = KEY_CACHE.get_or_init(|| Mutex::new(TtlCache::new(KEY_CACHE_CAPACITY)));
@@ -181,6 +179,7 @@ impl PublicKey {
         data_encoding::HEXLOWER.encode(&self.as_bytes()[..5])
     }
 
+    /// The length of an ed25519 `PublicKey`, in bytes.
     pub const LENGTH: usize = ed25519_dalek::PUBLIC_KEY_LENGTH;
 }
 
@@ -259,6 +258,7 @@ pub enum KeyParsingError {
     /// Error when decoding the public key.
     #[error("key: {0}")]
     Key(#[from] ed25519_dalek::SignatureError),
+    /// The encoded information had the wrong length.
     #[error("invalid length")]
     DecodeInvalidLength,
 }
@@ -280,7 +280,7 @@ impl FromStr for PublicKey {
 #[derive(Clone)]
 pub struct SecretKey {
     secret: SigningKey,
-    secret_crypto_box: OnceCell<crypto_box::SecretKey>,
+    secret_crypto_box: OnceLock<crypto_box::SecretKey>,
 }
 
 impl Debug for SecretKey {
@@ -334,40 +334,19 @@ impl SecretKey {
         self.secret.verifying_key().into()
     }
 
-    /// Generate a new [`SecretKey`] with the default randomness generator.
-    pub fn generate() -> Self {
-        let mut rng = rand::rngs::OsRng;
-        Self::generate_with_rng(&mut rng)
-    }
-
     /// Generate a new [`SecretKey`] with a randomness generator.
-    pub fn generate_with_rng<R: CryptoRngCore + ?Sized>(csprng: &mut R) -> Self {
-        let secret = SigningKey::generate(csprng);
+    ///
+    /// ```rust
+    /// // use the OsRng option for OS depedndent most secure RNG.
+    /// let mut rng = rand::rngs::OsRng;
+    /// let _key = iroh_base::SecretKey::generate(&mut rng);
+    /// ```
+    pub fn generate<R: CryptoRngCore>(mut csprng: R) -> Self {
+        let secret = SigningKey::generate(&mut csprng);
 
         Self {
             secret,
-            secret_crypto_box: OnceCell::default(),
-        }
-    }
-
-    /// Serialise this key to OpenSSH format.
-    pub fn to_openssh(&self) -> ssh_key::Result<zeroize::Zeroizing<String>> {
-        let ckey = ssh_key::private::Ed25519Keypair {
-            public: self.secret.verifying_key().into(),
-            private: self.secret.clone().into(),
-        };
-        ssh_key::private::PrivateKey::from(ckey).to_openssh(LineEnding::default())
-    }
-
-    /// Deserialise this key from OpenSSH format.
-    pub fn try_from_openssh<T: AsRef<[u8]>>(data: T) -> anyhow::Result<Self> {
-        let ser_key = ssh_key::private::PrivateKey::from_openssh(data)?;
-        match ser_key.key_data() {
-            ssh_key::private::KeypairData::Ed25519(kp) => Ok(SecretKey {
-                secret: kp.private.clone().into(),
-                secret_crypto_box: OnceCell::default(),
-            }),
-            _ => anyhow::bail!("invalid key format"),
+            secret_crypto_box: Default::default(),
         }
     }
 
@@ -400,7 +379,7 @@ impl From<SigningKey> for SecretKey {
     fn from(secret: SigningKey) -> Self {
         SecretKey {
             secret,
-            secret_crypto_box: OnceCell::default(),
+            secret_crypto_box: Default::default(),
         }
     }
 }
@@ -459,14 +438,6 @@ mod tests {
         assert_eq_hex!(bytes, expected);
     }
 
-    #[test]
-    fn test_secret_key_openssh_roundtrip() {
-        let kp = SecretKey::generate();
-        let ser = kp.to_openssh().unwrap();
-        let de = SecretKey::try_from_openssh(&ser).unwrap();
-        assert_eq!(kp.to_bytes(), de.to_bytes());
-    }
-
     #[test]
     fn public_key_postcard() {
         let key = PublicKey::from_bytes(&[0; 32]).unwrap();
@@ -485,7 +456,7 @@ mod tests {
 
     #[test]
     fn test_display_from_str() {
-        let key = SecretKey::generate();
+        let key = SecretKey::generate(&mut rand::thread_rng());
         assert_eq!(
             SecretKey::from_str(&key.to_string()).unwrap().to_bytes(),
             key.to_bytes()

iroh-base/src/key/encryption.rs

@@ -3,7 +3,6 @@
 use std::fmt::Debug;
 
 use aead::Buffer;
-use anyhow::{anyhow, ensure, Context, Result};
 
 pub(crate) const NONCE_LEN: usize = 24;
 
@@ -18,6 +17,17 @@ pub(super) fn secret_ed_box(key: &ed25519_dalek::SigningKey) -> crypto_box::Secr
 /// Shared Secret.
 pub struct SharedSecret(crypto_box::ChaChaBox);
 
+/// Errors that can occur during [`SharedSecret::open`].
+#[derive(Debug, thiserror::Error)]
+pub enum DecryptionError {
+    /// The nonce had the wrong size.
+    #[error("Invalid nonce")]
+    InvalidNonce,
+    /// AEAD decryption failed.
+    #[error("Aead error")]
+    Aead(aead::Error),
+}
+
 impl Debug for SharedSecret {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "SharedSecret(crypto_box::ChaChaBox)")
@@ -42,19 +52,21 @@ impl SharedSecret {
     }
 
     /// Opens the ciphertext, which must have been created using `Self::seal`, and places the clear text into the provided buffer.
-    pub fn open(&self, buffer: &mut dyn Buffer) -> Result<()> {
+    pub fn open(&self, buffer: &mut dyn Buffer) -> Result<(), DecryptionError> {
         use aead::AeadInPlace;
-        ensure!(buffer.len() > NONCE_LEN, "too short");
+        if buffer.len() < NONCE_LEN {
+            return Err(DecryptionError::InvalidNonce);
+        }
 
         let offset = buffer.len() - NONCE_LEN;
         let nonce: [u8; NONCE_LEN] = buffer.as_ref()[offset..]
             .try_into()
-            .context("nonce wrong length")?;
+            .map_err(|_| DecryptionError::InvalidNonce)?;
 
         buffer.truncate(offset);
         self.0
             .decrypt_in_place(&nonce.into(), &[], buffer)
-            .map_err(|e| anyhow!("decryption failed: {:?}", e))?;
+            .map_err(DecryptionError::Aead)?;
 
         Ok(())
     }
@@ -76,8 +88,8 @@ mod tests {
 
     #[test]
     fn test_seal_open_roundtrip() {
-        let key_a = crate::key::SecretKey::generate();
-        let key_b = crate::key::SecretKey::generate();
+        let key_a = crate::key::SecretKey::generate(&mut rand::thread_rng());
+        let key_b = crate::key::SecretKey::generate(&mut rand::thread_rng());
 
         seal_open_roundtrip(&key_a, &key_b);
         seal_open_roundtrip(&key_b, &key_a);
@@ -105,7 +117,7 @@ mod tests {
 
     #[test]
     fn test_same_public_key_api() {
-        let key = crate::key::SecretKey::generate();
+        let key = crate::key::SecretKey::generate(&mut rand::thread_rng());
         let public_key1: crypto_box::PublicKey = public_ed_box(&key.public().public());
         let public_key2: crypto_box::PublicKey = secret_ed_box(&key.secret).public_key();
 

iroh-base/src/lib.rs

@@ -1,5 +1,7 @@
 //! Base types and utilities for Iroh
 #![cfg_attr(iroh_docsrs, feature(doc_auto_cfg))]
+#![deny(missing_docs, rustdoc::broken_intra_doc_links)]
+#![cfg_attr(not(test), deny(clippy::unwrap_used))]
 
 // TODO: move to own crate
 #[cfg(feature = "ticket")]
@@ -13,8 +15,10 @@ mod node_addr;
 mod relay_url;
 
 #[cfg(feature = "key")]
-pub use self::key::{KeyParsingError, NodeId, PublicKey, SecretKey, SharedSecret, Signature};
+pub use self::key::{
+    DecryptionError, KeyParsingError, NodeId, PublicKey, SecretKey, SharedSecret, Signature,
+};
 #[cfg(feature = "key")]
 pub use self::node_addr::NodeAddr;
 #[cfg(feature = "relay")]
-pub use self::relay_url::RelayUrl;
+pub use self::relay_url::{RelayUrl, RelayUrlParseError};

iroh-base/src/relay_url.rs

@@ -1,6 +1,5 @@
 use std::{fmt, ops::Deref, str::FromStr};
 
-use anyhow::Context;
 use serde::{Deserialize, Serialize};
 use url::Url;
 /// A URL identifying a relay server.
@@ -36,15 +35,20 @@ impl From<Url> for RelayUrl {
     }
 }
 
+/// Can occur when parsing a string into a [`RelayUrl`].
+#[derive(Debug, thiserror::Error)]
+#[error("Failed to parse: {0}")]
+pub struct RelayUrlParseError(#[from] url::ParseError);
+
 /// Support for parsing strings directly.
 ///
 /// If you need more control over the error first create a [`Url`] and use [`RelayUrl::from`]
 /// instead.
 impl FromStr for RelayUrl {
-    type Err = anyhow::Error;
+    type Err = RelayUrlParseError;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let inner = Url::from_str(s).context("invalid URL")?;
+        let inner = Url::from_str(s)?;
         Ok(RelayUrl::from(inner))
     }
 }

iroh-base/src/ticket.rs

@@ -1,3 +1,8 @@
+//! Tickets is a serializable object combining information required for an operation.
+//! Typically tickets contain all information required for an operation, e.g. an iroh blob
+//! ticket would contain the hash of the data as well as information about how to reach the
+//! provider.
+
 use std::{collections::BTreeSet, net::SocketAddr};
 
 use serde::{Deserialize, Serialize};
@@ -10,10 +15,6 @@ pub use self::node::NodeTicket;
 
 /// A ticket is a serializable object combining information required for an operation.
 ///
-/// Typically tickets contain all information required for an operation, e.g. an iroh blob
-/// ticket would contain the hash of the data as well as information about how to reach the
-/// provider.
-///
 /// Tickets support serialization to a string using base32 encoding. The kind of
 /// ticket will be prepended to the string to make it somewhat self describing.
 ///
@@ -60,7 +61,10 @@ pub trait Ticket: Sized {
 pub enum Error {
     /// Found a ticket of with the wrong prefix, indicating the wrong kind.
     #[error("wrong prefix, expected {expected}")]
-    Kind { expected: &'static str },
+    Kind {
+        /// The expected prefix.
+        expected: &'static str,
+    },
     /// This looks like a ticket, but postcard deserialization failed.
     #[error("deserialization failed: {_0}")]
     Postcard(#[from] postcard::Error),

iroh-base/src/ticket/node.rs

@@ -141,7 +141,7 @@ mod tests {
     use crate::key::{PublicKey, SecretKey};
 
     fn make_ticket() -> NodeTicket {
-        let peer = SecretKey::generate().public();
+        let peer = SecretKey::generate(&mut rand::thread_rng()).public();
         let addr = SocketAddr::from((Ipv4Addr::LOCALHOST, 1234));
         let relay_url = None;
         NodeTicket {

iroh-dns-server/Cargo.toml

@@ -63,6 +63,8 @@ hickory-resolver = "=0.25.0-alpha.4"
 iroh = { version = "0.29.0", path = "../iroh" }
 iroh-test = { version = "0.29.0", path = "../iroh-test" }
 pkarr = { version = "2.2.0", features = ["rand"] }
+rand = "0.8"
+rand_chacha = "0.3.1"
 testresult = "0.4.1"
 
 [[bench]]

iroh-dns-server/benches/write.rs

@@ -2,6 +2,7 @@ use anyhow::Result;
 use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
 use iroh::{discovery::pkarr::PkarrRelayClient, dns::node_info::NodeInfo, SecretKey};
 use iroh_dns_server::{config::Config, server::Server, ZoneStore};
+use rand_chacha::rand_core::SeedableRng;
 use tokio::runtime::Runtime;
 
 const LOCALHOST_PKARR: &str = "http://localhost:8080/pkarr";
@@ -23,7 +24,8 @@ fn benchmark_dns_server(c: &mut Criterion) {
                     let config = Config::load("./config.dev.toml").await.unwrap();
                     let server = start_dns_server(config).await.unwrap();
 
-                    let secret_key = SecretKey::generate();
+                    let mut rng = rand_chacha::ChaCha8Rng::seed_from_u64(42);
+                    let secret_key = SecretKey::generate(&mut rng);
                     let node_id = secret_key.public();
 
                     let pkarr_relay = LOCALHOST_PKARR.parse().expect("valid url");