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Add const constructor to StarkFelt #128

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Sep 14, 2023
Merged

Add const constructor to StarkFelt #128

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43 changes: 16 additions & 27 deletions src/hash.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -58,36 +58,27 @@ impl StarkFelt {
}

/// [StarkFelt] constant that's equal to 0.
pub const ZERO: Self = {
Self([
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
])
};
pub const ZERO: Self = { Self::from_u128(0_u128) };

/// [StarkFelt] constant that's equal to 1.
pub const ONE: Self = {
Self([
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1,
])
};
pub const ONE: Self = { Self::from_u128(1_u128) };

/// [StarkFelt] constant that's equal to 2.
pub const TWO: Self = {
Self([
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2,
])
};
pub const TWO: Self = { Self::from_u128(2_u128) };

/// [StarkFelt] constant that's equal to 3.
pub const THREE: Self = {
Self([
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3,
])
};
pub const THREE: Self = { Self::from_u128(3_u128) };

pub const fn from_u128(val: u128) -> Self {
let mut bytes = [0u8; 32];
let val_bytes = val.to_be_bytes();
let mut index = 16;
while index < 32 {
bytes[index] = val_bytes[index - 16];
index += 1;
}
Self(bytes)
}

/// Storage efficient serialization for field elements.
pub fn serialize(&self, res: &mut impl std::io::Write) -> Result<(), Error> {
Expand Down Expand Up @@ -179,9 +170,7 @@ impl TryFrom<&str> for StarkFelt {

impl From<u128> for StarkFelt {
fn from(val: u128) -> Self {
let mut bytes = [0u8; 32];
bytes[16..32].copy_from_slice(&val.to_be_bytes());
Self(bytes)
Self::from_u128(val)
}
}

Expand Down
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