deterministic random wallet generationg

src/bin/client-demo.rs

@@ -11,7 +11,7 @@ use getopts::Options;
 use isatty::stdin_isatty;
 use rayon::prelude::*;
 use solana::mint::MintDemo;
-use solana::signature::{KeyPair, KeyPairUtil};
+use solana::signature::{GenKeys, KeyPair, KeyPairUtil};
 use solana::thin_client::ThinClient;
 use solana::transaction::Transaction;
 use std::env;
@@ -93,9 +93,20 @@ fn main() {
     let last_id = acc.get_last_id().wait().unwrap();
     println!("Got last ID {:?}", last_id);
 
+    let rnd = GenKeys::new(demo.mint.keypair().public_key_bytes());
+    let tokens_per_user = 1_000;
+
+    let users: Vec<_> = (0..demo.num_accounts)
+        .into_par_iter()
+        .map(|_| {
+            let pkcs8 = rnd.new_key();
+            (pkcs8, tokens_per_user)
+        })
+        .collect();
+
     println!("Creating keypairs...");
-    let txs = demo.users.len() / 2;
-    let keypairs: Vec<_> = demo.users
+    let txs = users.len() / 2;
+    let keypairs: Vec<_> = users
         .into_par_iter()
         .map(|(pkcs8, _)| KeyPair::from_pkcs8(Input::from(&pkcs8)).unwrap())
         .collect();

src/bin/genesis-demo.rs

@@ -11,7 +11,7 @@ use solana::accountant::MAX_ENTRY_IDS;
 use solana::entry::{create_entry, next_tick};
 use solana::event::Event;
 use solana::mint::MintDemo;
-use solana::signature::{KeyPair, KeyPairUtil};
+use solana::signature::{GenKeys, KeyPair, KeyPairUtil};
 use solana::transaction::Transaction;
 use std::io::{stdin, Read};
 use std::process::exit;
@@ -36,12 +36,23 @@ fn main() {
         exit(1);
     });
 
-    let num_accounts = demo.users.len();
+    let rnd = GenKeys::new(demo.mint.keypair().public_key_bytes());
+    let tokens_per_user = 1_000;
+
+    let users: Vec<_> = (0..demo.num_accounts)
+        .into_iter()
+        .map(|_| {
+            let pkcs8 = rnd.new_key();
+            (pkcs8, tokens_per_user)
+        })
+        .collect();
+
+    let num_accounts = users.len();
     let last_id = demo.mint.last_id();
     let mint_keypair = demo.mint.keypair();
 
     eprintln!("Signing {} transactions...", num_accounts);
-    let events: Vec<_> = demo.users
+    let events: Vec<_> = users
         .into_par_iter()
         .map(|(pkcs8, tokens)| {
             let rando = KeyPair::from_pkcs8(Input::from(&pkcs8)).unwrap();

src/bin/mint-demo.rs

@@ -3,10 +3,7 @@ extern crate ring;
 extern crate serde_json;
 extern crate solana;
 
-use rayon::prelude::*;
-use ring::rand::SystemRandom;
 use solana::mint::{Mint, MintDemo};
-use solana::signature::KeyPair;
 use std::io;
 
 fn main() {
@@ -18,16 +15,7 @@ fn main() {
     let mint = Mint::new(tokens);
     let tokens_per_user = 1_000;
     let num_accounts = tokens / tokens_per_user;
-    let rnd = SystemRandom::new();
 
-    let users: Vec<_> = (0..num_accounts)
-        .into_par_iter()
-        .map(|_| {
-            let pkcs8 = KeyPair::generate_pkcs8(&rnd).unwrap().to_vec();
-            (pkcs8, tokens_per_user)
-        })
-        .collect();
-
-    let demo = MintDemo { mint, users };
+    let demo = MintDemo { mint, num_accounts };
     println!("{}", serde_json::to_string(&demo).unwrap());
 }

src/mint.rs

@@ -61,7 +61,7 @@ impl Mint {
 #[derive(Serialize, Deserialize, Debug)]
 pub struct MintDemo {
     pub mint: Mint,
-    pub users: Vec<(Vec<u8>, i64)>,
+    pub num_accounts: i64,
 }
 
 #[cfg(test)]

src/signature.rs

@@ -2,8 +2,13 @@
 
 use generic_array::typenum::{U32, U64};
 use generic_array::GenericArray;
+use rand::{ChaChaRng, Rng, SeedableRng};
+use ring::error::Unspecified;
+use ring::rand::SecureRandom;
 use ring::signature::Ed25519KeyPair;
 use ring::{rand, signature};
+use std::mem;
+use std::sync::RwLock;
 use untrusted;
 
 pub type KeyPair = Ed25519KeyPair;
@@ -41,3 +46,29 @@ impl SignatureUtil for GenericArray<u8, U64> {
         signature::verify(&signature::ED25519, peer_public_key, msg, sig).is_ok()
     }
 }
+
+pub struct GenKeys {
+    generator: RwLock<ChaChaRng>,
+}
+
+impl GenKeys {
+    pub fn new(seed_values: &[u8]) -> GenKeys {
+        let seed: &[u8] = &seed_values[..];
+        let rng: ChaChaRng = SeedableRng::from_seed(unsafe { mem::transmute(seed) });
+        GenKeys {
+            generator: RwLock::new(rng),
+        }
+    }
+
+    pub fn new_key(&self) -> Vec<u8> {
+        KeyPair::generate_pkcs8(self).unwrap().to_vec()
+    }
+}
+
+impl SecureRandom for GenKeys {
+    fn fill(&self, dest: &mut [u8]) -> Result<(), Unspecified> {
+        let mut rng = self.generator.write().unwrap();
+        rng.fill_bytes(dest);
+        Ok(())
+    }
+}