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fix: Fr::from_u64 big-endian encoding to match C++ msgpack format #22233

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Merged
ludamad merged 1 commit into from
Apr 6, 2026
Merged

fix: Fr::from_u64 big-endian encoding to match C++ msgpack format #22233

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4 changes: 2 additions & 2 deletions barretenberg/rust/barretenberg-rs/src/types.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,10 +7,10 @@ use serde::{Deserialize, Serialize};
pub struct Fr(pub [u8; 32]);

impl Fr {
/// Create a new field element from a u64 value (little-endian encoding)
/// Create a new field element from a u64 value (big-endian encoding, matching C++ msgpack format)
pub fn from_u64(value: u64) -> Self {
let mut bytes = [0u8; 32];
bytes[0..8].copy_from_slice(&value.to_le_bytes());
bytes[24..32].copy_from_slice(&value.to_be_bytes());
Fr(bytes)
}

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