Trait arx_kw::ConstantTimeEq [−][src]
An Eq
-like trait that produces a Choice
instead of a bool
.
Example
use subtle::ConstantTimeEq; let x: u8 = 5; let y: u8 = 13; assert_eq!(x.ct_eq(&y).unwrap_u8(), 0); assert_eq!(x.ct_eq(&x).unwrap_u8(), 1);
Required methods
pub fn ct_eq(&self, other: &Self) -> Choice
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Determine if two items are equal.
The ct_eq
function should execute in constant time.
Returns
Choice(1u8)
ifself == other
;Choice(0u8)
ifself != other
.
Implementations on Foreign Types
impl ConstantTimeEq for i16
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impl ConstantTimeEq for u32
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impl ConstantTimeEq for u8
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impl ConstantTimeEq for isize
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impl ConstantTimeEq for u16
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impl ConstantTimeEq for i8
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impl ConstantTimeEq for i64
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impl ConstantTimeEq for u64
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impl<T> ConstantTimeEq for CtOption<T> where
T: ConstantTimeEq,
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T: ConstantTimeEq,
pub fn ct_eq(&self, rhs: &CtOption<T>) -> Choice
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Two CtOption<T>
s are equal if they are both Some
and
their values are equal, or both None
.
impl ConstantTimeEq for i128
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impl ConstantTimeEq for usize
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impl ConstantTimeEq for u128
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impl ConstantTimeEq for i32
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impl<T> ConstantTimeEq for [T] where
T: ConstantTimeEq,
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T: ConstantTimeEq,
pub fn ct_eq(&self, _rhs: &[T]) -> Choice
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Check whether two slices of ConstantTimeEq
types are equal.
Note
This function short-circuits if the lengths of the input slices are different. Otherwise, it should execute in time independent of the slice contents.
Since arrays coerce to slices, this function works with fixed-size arrays:
let a: [u8; 8] = [0,1,2,3,4,5,6,7]; let b: [u8; 8] = [0,1,2,3,0,1,2,3]; let a_eq_a = a.ct_eq(&a); let a_eq_b = a.ct_eq(&b); assert_eq!(a_eq_a.unwrap_u8(), 1); assert_eq!(a_eq_b.unwrap_u8(), 0);