Make rand a feature-gated dep

Cargo.lock

@@ -726,6 +726,7 @@ dependencies = [
  "curve25519-dalek",
  "ed25519",
  "rand 0.7.3",
+ "rand_core 0.5.1",
  "serde",
  "serde_bytes",
  "sha2 0.9.9",

keypair/Cargo.toml

@@ -10,8 +10,7 @@ repository = "https://github.com/fluencelabs/trust-graph"
 [dependencies]
 serde = { version = "1.0.118", features = ["derive"] }
 bs58 = "0.5.0"
-ed25519-dalek = { version = "1.0.1", features = ["serde", "std"] }
-rand = "0.8.5"
+ed25519-dalek = { version = "1.0.1", features = ["serde", "std"], default-features = false }
 thiserror = "1.0.23"
 lazy_static = "1.4"
 sha2 = "0.10.6"
@@ -20,9 +19,15 @@ serde_bytes = "0.11"
 eyre = "0.6.5"
 libp2p-identity = { workspace = true, default-features = false, features = ["peerid", "ed25519"] }
 multihash = { version = "0.18.0", features = ["identity"] }
+# rand fails to compile for restricted environments like NEAR contracts
+rand = { version = "0.8.5", optional = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 ring = { version = "0.16.9", features = ["alloc", "std"], default-features = false }
 
+[features]
+default = ["rand"]
+rand = ["dep:rand", "ed25519-dalek/rand_core"]
+
 [dev-dependencies]
 quickcheck = "1.0.3"

keypair/src/ed25519.rs

@@ -22,6 +22,7 @@
 use crate::error::{DecodingError, SigningError, VerificationError};
 use core::fmt;
 use ed25519_dalek::{self as ed25519, Signer as _, Verifier as _};
+#[cfg(feature = "rand")]
 use rand::RngCore;
 use serde::{Deserialize, Serialize};
 use std::convert::TryFrom;
@@ -32,6 +33,7 @@ pub struct Keypair(ed25519::Keypair);
 
 impl Keypair {
     /// Generate a new Ed25519 keypair.
+    #[cfg(feature = "rand")]
     pub fn generate() -> Self {
         Keypair::from(SecretKey::generate())
     }
@@ -174,6 +176,7 @@ impl fmt::Debug for SecretKey {
 
 impl SecretKey {
     /// Generate a new Ed25519 secret key.
+    #[cfg(feature = "rand")]
     pub fn generate() -> Self {
         let mut bytes = [0u8; 32];
         rand::thread_rng().fill_bytes(&mut bytes);
@@ -198,7 +201,7 @@ impl SecretKey {
 #[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
 pub struct Signature(pub Vec<u8>);
 
-#[cfg(test)]
+#[cfg(all(test, feature = "rand"))]
 mod tests {
     use super::*;
     use crate::KeyPair;

keypair/src/key_pair.rs

@@ -95,6 +95,7 @@ pub enum KeyPair {
 }
 
 impl KeyPair {
+    #[cfg(feature = "rand")]
     pub fn generate(format: KeyFormat) -> KeyPair {
         match format {
             KeyFormat::Ed25519 => KeyPair::generate_ed25519(),
@@ -102,6 +103,7 @@ impl KeyPair {
     }
 
     /// Generate a new Ed25519 keypair.
+    #[cfg(feature = "rand")]
     pub fn generate_ed25519() -> KeyPair {
         KeyPair::Ed25519(ed25519::Keypair::generate())
     }

keypair/src/public_key.rs

@@ -149,7 +149,7 @@ fn as_public_key(peer_id: &PeerId) -> Option<libp2p_identity::PublicKey> {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "rand"))]
 mod tests {
     use super::*;
     use crate::KeyPair;