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chore: switch gas check order in blake2 precompile #1718

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Aug 26, 2024
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chore: switch gas check order in blake2 precompile #1718

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12 changes: 6 additions & 6 deletions crates/precompile/src/blake2.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,19 +17,19 @@ pub fn run(input: &Bytes, gas_limit: u64) -> PrecompileResult {
return Err(Error::Blake2WrongLength.into());
}
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technically this check also would go below gas check, and then gas check would have to handle empty input...


let f = match input[212] {
1 => true,
0 => false,
_ => return Err(Error::Blake2WrongFinalIndicatorFlag.into()),
};

// rounds 4 bytes
let rounds = u32::from_be_bytes(input[..4].try_into().unwrap()) as usize;
let gas_used = rounds as u64 * F_ROUND;
if gas_used > gas_limit {
return Err(Error::OutOfGas.into());
}

let f = match input[212] {
1 => true,
0 => false,
_ => return Err(Error::Blake2WrongFinalIndicatorFlag.into()),
};

let mut h = [0u64; 8];
let mut m = [0u64; 16];

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