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refactor(pda): use descriptive string seeds for PDA derivation

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Replace the hardcoded numeric byte-stream seeds ([0; 32], [1; 32], ...)
used for domain separation in PDA derivation with descriptive byte-string
constants, mirroring the AMM config account's existing b"CONFIG" seed.

  amm:         [0; 32] -> b"LIQUIDITY_TOKEN"
               [1; 32] -> b"LP_LOCK_HOLDING"
  stablecoin:  [0; 32] -> b"POSITION"
               [1; 32] -> b"POSITION_VAULT"
  twap_oracle: [2; 32] -> b"PRICE_OBSERVATIONS"
               [3; 32] -> b"ORACLE_PRICE_ACCOUNT"
               [4; 32] -> b"CURRENT_TICK_ACCOUNT"

Since the seeds are now variable-length, each compute_*_pda_seed function
builds its hash input with a Vec and extend_from_slice instead of a
fixed-size buffer with offset writes.

Closes #146
This commit is contained in:
r4bbit
2026-06-22 14:12:13 +02:00
parent 0e2c5f9329
commit 03345db803
3 changed files with 38 additions and 38 deletions
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programs/stablecoin/core/src/lib.rs
+11 -9
View File
@@ -8,8 +8,10 @@ use nssa_core::{
use serde::{Deserialize, Serialize};
use spel_framework_macros::account_type;
const POSITION_PDA_DOMAIN: [u8; 32] = [0; 32];
const POSITION_VAULT_PDA_DOMAIN: [u8; 32] = [1; 32];
// Stable domain-separation tags for the position PDAs; these must stay unchanged for address
// compatibility.
const POSITION_PDA_DOMAIN: &[u8] = b"POSITION";
const POSITION_VAULT_PDA_DOMAIN: &[u8] = b"POSITION_VAULT";
/// Stablecoin Program Instruction.
#[derive(Debug, Serialize, Deserialize)]
@@ -122,10 +124,10 @@ pub fn compute_position_pda_seed(
) -> PdaSeed {
use risc0_zkvm::sha::{Impl, Sha256 as _};
let mut bytes = [0u8; 96];
bytes[0..32].copy_from_slice(&owner_id.to_bytes());
bytes[32..64].copy_from_slice(&collateral_definition_id.to_bytes());
bytes[64..96].copy_from_slice(&POSITION_PDA_DOMAIN);
let mut bytes = Vec::new();
bytes.extend_from_slice(&owner_id.to_bytes());
bytes.extend_from_slice(&collateral_definition_id.to_bytes());
bytes.extend_from_slice(POSITION_PDA_DOMAIN);
let mut out = [0u8; 32];
out.copy_from_slice(Impl::hash_bytes(&bytes).as_bytes());
@@ -151,9 +153,9 @@ pub fn compute_position_pda(
pub fn compute_position_vault_pda_seed(position_id: AccountId) -> PdaSeed {
use risc0_zkvm::sha::{Impl, Sha256 as _};
let mut bytes = [0u8; 64];
bytes[0..32].copy_from_slice(&position_id.to_bytes());
bytes[32..64].copy_from_slice(&POSITION_VAULT_PDA_DOMAIN);
let mut bytes = Vec::new();
bytes.extend_from_slice(&position_id.to_bytes());
bytes.extend_from_slice(POSITION_VAULT_PDA_DOMAIN);
let mut out = [0u8; 32];
out.copy_from_slice(Impl::hash_bytes(&bytes).as_bytes());