Cache fewer pedersen hash generators.

src/circuit/pedersen_hash.rs

@@ -149,7 +149,7 @@ mod test {
         let mut rng = XorShiftRng::from_seed([0x3dbe6259, 0x8d313d76, 0x3237db17, 0xe5bc0654]);
         let params = &JubjubBls12::new();
 
-        for length in 1..1000 {
+        for length in 0..751 {
             for _ in 0..5 {
                 let mut input: Vec<bool> = (0..length).map(|_| rng.gen()).collect();
 

src/jubjub/mod.rs

@@ -185,7 +185,7 @@ impl JubjubBls12 {
             let mut cur = 0;
             let mut pedersen_hash_generators = vec![];
 
-            while pedersen_hash_generators.len() < 10 {
+            while pedersen_hash_generators.len() < 5 {
                 let gh = group_hash(&[cur], ::PEDERSEN_HASH_GENERATORS_PERSONALIZATION, &tmp);
                 // We don't want to overflow and start reusing generators
                 assert!(cur != u8::max_value());