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

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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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3
crypto/dalek-ff-group/Cargo.toml
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@@ -28,7 +28,8 @@ sha2 = { version = "0.11.0-rc.0", default-features = false }
prime-field = { path = "../prime-field", default-features = false }
ciphersuite = { version = "0.4.2", path = "../ciphersuite", default-features = false }
crypto-bigint = { version = "0.5", default-features = false, features = ["zeroize"] }
crypto-bigint-05 = { package = "crypto-bigint", version = "0.5", default-features = false, features = ["zeroize"] }
crypto-bigint = { version = "0.6", default-features = false, features = ["zeroize"] }
curve25519-dalek = { version = ">= 4.0, < 4.2", default-features = false, features = ["zeroize", "digest", "group", "precomputed-tables"] }

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.