Increase weight entropy (#114)

AaronFeickert · web-flow · commit bf0cb42fff55 · 2025-07-14T11:55:04.000-05:00
diff --git a/src/proof.rs b/src/proof.rs
@@ -685,7 +685,9 @@ impl TriptychProof {
 
             // Run the Fiat-Shamir response phase to get the transcript generator and weight
             let mut transcript_rng = transcript.response(&proof.f, &proof.z_A, &proof.z_C, &proof.z);
-            transcript_weights.append_u64(b"proof", transcript_rng.as_rngcore().next_u64());
+            let mut transcript_bytes = [0u8; 32];
+            transcript_rng.as_rngcore().fill_bytes(&mut transcript_bytes);
+            transcript_weights.append_message(b"proof", &transcript_bytes);
         }
 
         // Finalize the weighting transcript into a pseudorandom number generator

Original file line number	Diff line number	Diff line change
`@@ -685,7 +685,9 @@ impl TriptychProof {`
`685`	`685`
`686`	`686`	`// Run the Fiat-Shamir response phase to get the transcript generator and weight`
`687`	`687`	`let mut transcript_rng = transcript.response(&proof.f, &proof.z_A, &proof.z_C, &proof.z);`
`688`		`- transcript_weights.append_u64(b"proof", transcript_rng.as_rngcore().next_u64());`
	`688`	`+ let mut transcript_bytes = [0u8; 32];`
	`689`	`+ transcript_rng.as_rngcore().fill_bytes(&mut transcript_bytes);`
	`690`	`+ transcript_weights.append_message(b"proof", &transcript_bytes);`
`689`	`691`	`}`
`690`	`692`
`691`	`693`	`// Finalize the weighting transcript into a pseudorandom number generator`