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Auto merge of #75 - ebfull:primerepr-fixes, r=ebfull

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PrimeRepr improvements

These are API-breaking changes that make `PrimeRepr` a little nicer.
This commit is contained in:
bmerge 2018-02-21 15:56:41 +00:00
commit da717f4472
4 changed files with 46 additions and 68 deletions
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42
src/bls12_381/fq.rs
View File

@ -276,7 +276,7 @@ impl PrimeFieldRepr for FqRepr {
}
#[inline(always)]
fn divn(&mut self, mut n: u32) {
fn shr(&mut self, mut n: u32) {
if n >= 64 * 6 {
*self = Self::from(0);
return;
@ -324,7 +324,7 @@ impl PrimeFieldRepr for FqRepr {
}
#[inline(always)]
fn muln(&mut self, mut n: u32) {
fn shl(&mut self, mut n: u32) {
if n >= 64 * 6 {
*self = Self::from(0);
return;
@ -364,25 +364,21 @@ impl PrimeFieldRepr for FqRepr {
}
#[inline(always)]
fn add_nocarry(&mut self, other: &FqRepr) -> bool {
fn add_nocarry(&mut self, other: &FqRepr) {
let mut carry = 0;
for (a, b) in self.0.iter_mut().zip(other.0.iter()) {
*a = ::adc(*a, *b, &mut carry);
}
carry != 0
}
#[inline(always)]
fn sub_noborrow(&mut self, other: &FqRepr) -> bool {
fn sub_noborrow(&mut self, other: &FqRepr) {
let mut borrow = 0;
for (a, b) in self.0.iter_mut().zip(other.0.iter()) {
*a = ::sbb(*a, *b, &mut borrow);
}
borrow != 0
}
}
@ -969,29 +965,29 @@ fn test_fq_repr_div2() {
}
#[test]
fn test_fq_repr_divn() {
fn test_fq_repr_shr() {
let mut a = FqRepr([0xaa5cdd6172847ffd, 0x43242c06aed55287, 0x9ddd5b312f3dd104, 0xc5541fd48046b7e7, 0x16080cf4071e0b05, 0x1225f2901aea514e]);
a.divn(0);
a.shr(0);
assert_eq!(
a,
FqRepr([0xaa5cdd6172847ffd, 0x43242c06aed55287, 0x9ddd5b312f3dd104, 0xc5541fd48046b7e7, 0x16080cf4071e0b05, 0x1225f2901aea514e])
);
a.divn(1);
a.shr(1);
assert_eq!(
a,
FqRepr([0xd52e6eb0b9423ffe, 0x21921603576aa943, 0xceeead98979ee882, 0xe2aa0fea40235bf3, 0xb04067a038f0582, 0x912f9480d7528a7])
);
a.divn(50);
a.shr(50);
assert_eq!(
a,
FqRepr([0x8580d5daaa50f54b, 0xab6625e7ba208864, 0x83fa9008d6fcf3bb, 0x19e80e3c160b8aa, 0xbe52035d4a29c2c1, 0x244])
);
a.divn(130);
a.shr(130);
assert_eq!(
a,
FqRepr([0xa0fea40235bf3cee, 0x4067a038f0582e2a, 0x2f9480d7528a70b0, 0x91, 0x0, 0x0])
);
a.divn(64);
a.shr(64);
assert_eq!(
a,
FqRepr([0x4067a038f0582e2a, 0x2f9480d7528a70b0, 0x91, 0x0, 0x0, 0x0])
@ -1067,13 +1063,10 @@ fn test_fq_repr_sub_noborrow() {
assert_eq!(csub_ab, csub_ba);
}
// Subtracting q+1 from q should produce a borrow
// Subtracting q+1 from q should produce -1 (mod 2**384)
let mut qplusone = FqRepr([0xb9feffffffffaaab, 0x1eabfffeb153ffff, 0x6730d2a0f6b0f624, 0x64774b84f38512bf, 0x4b1ba7b6434bacd7, 0x1a0111ea397fe69a]);
assert!(qplusone.sub_noborrow(&FqRepr([0xb9feffffffffaaac, 0x1eabfffeb153ffff, 0x6730d2a0f6b0f624, 0x64774b84f38512bf, 0x4b1ba7b6434bacd7, 0x1a0111ea397fe69a])));
// Subtracting x from x should produce no borrow
let mut x = FqRepr([0xb9feffffffffaaac, 0x1eabfffeb153ffff, 0x6730d2a0f6b0f624, 0x64774b84f38512bf, 0x4b1ba7b6434bacd7, 0x1a0111ea397fe69a]);
assert!(!x.sub_noborrow(&FqRepr([0xb9feffffffffaaac, 0x1eabfffeb153ffff, 0x6730d2a0f6b0f624, 0x64774b84f38512bf, 0x4b1ba7b6434bacd7, 0x1a0111ea397fe69a])))
qplusone.sub_noborrow(&FqRepr([0xb9feffffffffaaac, 0x1eabfffeb153ffff, 0x6730d2a0f6b0f624, 0x64774b84f38512bf, 0x4b1ba7b6434bacd7, 0x1a0111ea397fe69a]));
assert_eq!(qplusone, FqRepr([0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff]));
}
#[test]
@ -1126,13 +1119,10 @@ fn test_fq_repr_add_nocarry() {
assert_eq!(abc, cba);
}
// Adding 1 to (2^384 - 1) should produce a carry
// Adding 1 to (2^384 - 1) should produce zero
let mut x = FqRepr([0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff]);
assert!(x.add_nocarry(&FqRepr::from(1)));
// Adding 1 to q should not produce a carry
let mut x = FqRepr([0xb9feffffffffaaab, 0x1eabfffeb153ffff, 0x6730d2a0f6b0f624, 0x64774b84f38512bf, 0x4b1ba7b6434bacd7, 0x1a0111ea397fe69a]);
assert!(!x.add_nocarry(&FqRepr::from(1)));
x.add_nocarry(&FqRepr::from(1));
assert!(x.is_zero());
}
#[test]

42
src/bls12_381/fr.rs
View File

@ -113,7 +113,7 @@ impl PrimeFieldRepr for FrRepr {
}
#[inline(always)]
fn divn(&mut self, mut n: u32) {
fn shr(&mut self, mut n: u32) {
if n >= 64 * 4 {
*self = Self::from(0);
return;
@ -161,7 +161,7 @@ impl PrimeFieldRepr for FrRepr {
}
#[inline(always)]
fn muln(&mut self, mut n: u32) {
fn shl(&mut self, mut n: u32) {
if n >= 64 * 4 {
*self = Self::from(0);
return;
@ -201,25 +201,21 @@ impl PrimeFieldRepr for FrRepr {
}
#[inline(always)]
fn add_nocarry(&mut self, other: &FrRepr) -> bool {
fn add_nocarry(&mut self, other: &FrRepr) {
let mut carry = 0;
for (a, b) in self.0.iter_mut().zip(other.0.iter()) {
*a = ::adc(*a, *b, &mut carry);
}
carry != 0
}
#[inline(always)]
fn sub_noborrow(&mut self, other: &FrRepr) -> bool {
fn sub_noborrow(&mut self, other: &FrRepr) {
let mut borrow = 0;
for (a, b) in self.0.iter_mut().zip(other.0.iter()) {
*a = ::sbb(*a, *b, &mut borrow);
}
borrow != 0
}
}
@ -674,29 +670,29 @@ fn test_fr_repr_div2() {
}
#[test]
fn test_fr_repr_divn() {
fn test_fr_repr_shr() {
let mut a = FrRepr([0xb33fbaec482a283f, 0x997de0d3a88cb3df, 0x9af62d2a9a0e5525, 0x36003ab08de70da1]);
a.divn(0);
a.shr(0);
assert_eq!(
a,
FrRepr([0xb33fbaec482a283f, 0x997de0d3a88cb3df, 0x9af62d2a9a0e5525, 0x36003ab08de70da1])
);
a.divn(1);
a.shr(1);
assert_eq!(
a,
FrRepr([0xd99fdd762415141f, 0xccbef069d44659ef, 0xcd7b16954d072a92, 0x1b001d5846f386d0])
);
a.divn(50);
a.shr(50);
assert_eq!(
a,
FrRepr([0xbc1a7511967bf667, 0xc5a55341caa4b32f, 0x75611bce1b4335e, 0x6c0])
);
a.divn(130);
a.shr(130);
assert_eq!(
a,
FrRepr([0x1d5846f386d0cd7, 0x1b0, 0x0, 0x0])
);
a.divn(64);
a.shr(64);
assert_eq!(
a,
FrRepr([0x1b0, 0x0, 0x0, 0x0])
@ -772,13 +768,10 @@ fn test_fr_repr_sub_noborrow() {
assert_eq!(csub_ab, csub_ba);
}
// Subtracting r+1 from r should produce a borrow
// Subtracting r+1 from r should produce -1 (mod 2**256)
let mut qplusone = FrRepr([0xffffffff00000001, 0x53bda402fffe5bfe, 0x3339d80809a1d805, 0x73eda753299d7d48]);
assert!(qplusone.sub_noborrow(&FrRepr([0xffffffff00000002, 0x53bda402fffe5bfe, 0x3339d80809a1d805, 0x73eda753299d7d48])));
// Subtracting x from x should produce no borrow
let mut x = FrRepr([0xffffffff00000001, 0x53bda402fffe5bfe, 0x3339d80809a1d805, 0x73eda753299d7d48]);
assert!(!x.sub_noborrow(&FrRepr([0xffffffff00000001, 0x53bda402fffe5bfe, 0x3339d80809a1d805, 0x73eda753299d7d48])))
qplusone.sub_noborrow(&FrRepr([0xffffffff00000002, 0x53bda402fffe5bfe, 0x3339d80809a1d805, 0x73eda753299d7d48]));
assert_eq!(qplusone, FrRepr([0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff]));
}
#[test]
@ -842,13 +835,10 @@ fn test_fr_repr_add_nocarry() {
assert_eq!(abc, cba);
}
// Adding 1 to (2^256 - 1) should produce a carry
// Adding 1 to (2^256 - 1) should produce zero
let mut x = FrRepr([0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff]);
assert!(x.add_nocarry(&FrRepr::from(1)));
// Adding 1 to r should not produce a carry
let mut x = FrRepr([0xffffffff00000001, 0x53bda402fffe5bfe, 0x3339d80809a1d805, 0x73eda753299d7d48]);
assert!(!x.add_nocarry(&FrRepr::from(1)));
x.add_nocarry(&FrRepr::from(1));
assert!(x.is_zero());
}
#[test]

18
src/lib.rs
View File

@ -353,11 +353,11 @@ pub trait PrimeFieldRepr: Sized +
AsMut<[u64]> +
From<u64>
{
/// Subtract another represetation from this one, returning the borrow bit.
fn sub_noborrow(&mut self, other: &Self) -> bool;
/// Subtract another represetation from this one.
fn sub_noborrow(&mut self, other: &Self);
/// Add another representation to this one, returning the carry bit.
fn add_nocarry(&mut self, other: &Self) -> bool;
/// Add another representation to this one.
fn add_nocarry(&mut self, other: &Self);
/// Compute the number of bits needed to encode this number. Always a
/// multiple of 64.
@ -377,17 +377,16 @@ pub trait PrimeFieldRepr: Sized +
fn div2(&mut self);
/// Performs a rightwise bitshift of this number by some amount.
fn divn(&mut self, amt: u32);
fn shr(&mut self, amt: u32);
/// Performs a leftwise bitshift of this number, effectively multiplying
/// it by 2. Overflow is ignored.
fn mul2(&mut self);
/// Performs a leftwise bitshift of this number by some amount.
fn muln(&mut self, amt: u32);
fn shl(&mut self, amt: u32);
/// Writes this `PrimeFieldRepr` as a big endian integer. Always writes
/// `(num_bits` / 8) bytes.
/// Writes this `PrimeFieldRepr` as a big endian integer.
fn write_be<W: Write>(&self, mut writer: W) -> io::Result<()> {
use byteorder::{WriteBytesExt, BigEndian};
@ -398,8 +397,7 @@ pub trait PrimeFieldRepr: Sized +
Ok(())
}
/// Reads a big endian integer occupying (`num_bits` / 8) bytes into this
/// representation.
/// Reads a big endian integer into this representation.
fn read_be<R: Read>(&mut self, mut reader: R) -> io::Result<()> {
use byteorder::{ReadBytesExt, BigEndian};

12
src/tests/repr.rs
View File

@ -3,8 +3,8 @@ use ::{PrimeFieldRepr};
pub fn random_repr_tests<R: PrimeFieldRepr>() {
random_encoding_tests::<R>();
random_muln_tests::<R>();
random_divn_tests::<R>();
random_shl_tests::<R>();
random_shr_tests::<R>();
}
fn random_encoding_tests<R: PrimeFieldRepr>() {
@ -22,7 +22,7 @@ fn random_encoding_tests<R: PrimeFieldRepr>() {
}
}
fn random_muln_tests<R: PrimeFieldRepr>() {
fn random_shl_tests<R: PrimeFieldRepr>() {
let mut rng = XorShiftRng::from_seed([0x5dbe6259, 0x8d313d76, 0x3237db17, 0xe5bc0654]);
for _ in 0..100 {
@ -36,14 +36,14 @@ fn random_muln_tests<R: PrimeFieldRepr>() {
r1.mul2();
}
r2.muln(shift);
r2.shl(shift);
assert_eq!(r1, r2);
}
}
}
fn random_divn_tests<R: PrimeFieldRepr>() {
fn random_shr_tests<R: PrimeFieldRepr>() {
let mut rng = XorShiftRng::from_seed([0x5dbe6259, 0x8d313d76, 0x3237db17, 0xe5bc0654]);
for _ in 0..100 {
@ -57,7 +57,7 @@ fn random_divn_tests<R: PrimeFieldRepr>() {
r1.div2();
}
r2.divn(shift);
r2.shr(shift);
assert_eq!(r1, r2);
}