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Remove crypto-bigint from the public API of prime-field

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This commit is contained in:
Luke Parker
2025-09-03 06:41:42 -04:00
parent 974bc82387
commit 41c34d7f11
6 changed files with 101 additions and 24 deletions
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14
crypto/dalek-ff-group/src/lib.rs
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@@ -500,8 +500,18 @@ impl FieldElement {
///
/// This will reduce the `U256` by the modulus, into a member of the field.
#[deprecated]
pub const fn from_u256(u256: &crypto_bigint::U256) -> Self {
FieldElement::from(&prime_field::crypto_bigint::U256::from_words(*u256.as_words()))
pub const fn from_u256(u256: &crypto_bigint_05::U256) -> Self {
const MODULUS: crypto_bigint::U256 = crypto_bigint::U256::from_be_hex(
"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed",
);
let mut u256 = crypto_bigint::U256::from_words(*u256.as_words());
loop {
let result = FieldElement::from_bytes(&u256.to_le_bytes());
if let Some(result) = result {
return result;
}
u256 = u256.wrapping_sub(&MODULUS);
}
}
/// Create a `FieldElement` from the reduction of a 512-bit number.