ark_r1cs_std::fields::fp

Struct AllocatedFp

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pub struct AllocatedFp<F: PrimeField> {
    pub variable: Variable,
    pub cs: ConstraintSystemRef<F>,
    /* private fields */
}
Expand description

Represents a variable in the constraint system whose value can be an arbitrary field element.

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§variable: Variable

The allocated variable corresponding to self in self.cs.

§cs: ConstraintSystemRef<F>

The constraint system that self was allocated in.

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impl<F: PrimeField> AllocatedFp<F>

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pub fn new( value: Option<F>, variable: Variable, cs: ConstraintSystemRef<F>, ) -> Self

Constructs a new AllocatedFp from a (optional) value, a low-level Variable, and a ConstraintSystemRef.

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impl<F: PrimeField> AllocatedFp<F>

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pub fn from(other: Boolean<F>) -> Self

Constructs Self from a Boolean: if other is false, this outputs zero, else it outputs one.

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pub fn value(&self) -> Result<F, SynthesisError>

Returns the value assigned to self in the underlying constraint system (if a value was assigned).

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pub fn add(&self, other: &Self) -> Self

Outputs self + other.

This does not create any constraints.

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pub fn add_many<B: Borrow<Self>, I: Iterator<Item = B>>(iter: I) -> Self

Add many allocated Fp elements together.

This does not create any constraints and only creates one linear combination.

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pub fn sub(&self, other: &Self) -> Self

Outputs self - other.

This does not create any constraints.

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pub fn mul(&self, other: &Self) -> Self

Outputs self * other.

This requires one constraint.

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pub fn add_constant(&self, other: F) -> Self

Output self + other

This does not create any constraints.

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pub fn sub_constant(&self, other: F) -> Self

Output self - other

This does not create any constraints.

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pub fn mul_constant(&self, other: F) -> Self

Output self * other

This does not create any constraints.

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pub fn double(&self) -> Result<Self, SynthesisError>

Output self + self

This does not create any constraints.

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pub fn negate(&self) -> Self

Output -self

This does not create any constraints.

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pub fn negate_in_place(&mut self) -> &mut Self

Sets self = -self

This does not create any constraints.

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pub fn square(&self) -> Result<Self, SynthesisError>

Outputs self * self

This requires one constraint.

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pub fn inverse(&self) -> Result<Self, SynthesisError>

Outputs result such that result * self = 1.

This requires one constraint.

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pub fn frobenius_map(&self, _: usize) -> Result<Self, SynthesisError>

This is a no-op for prime fields.

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pub fn mul_equals( &self, other: &Self, result: &Self, ) -> Result<(), SynthesisError>

Enforces that self * other = result.

This requires one constraint.

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pub fn square_equals(&self, result: &Self) -> Result<(), SynthesisError>

Enforces that self * self = result.

This requires one constraint.

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pub fn is_eq(&self, other: &Self) -> Result<Boolean<F>, SynthesisError>

Outputs the bit self == other.

This requires two constraints.

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pub fn is_neq(&self, other: &Self) -> Result<Boolean<F>, SynthesisError>

Outputs the bit self != other.

This requires two constraints.

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pub fn conditional_enforce_equal( &self, other: &Self, should_enforce: &Boolean<F>, ) -> Result<(), SynthesisError>

Enforces that self == other if should_enforce.is_eq(&Boolean::TRUE).

This requires one constraint.

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pub fn conditional_enforce_not_equal( &self, other: &Self, should_enforce: &Boolean<F>, ) -> Result<(), SynthesisError>

Enforces that self != other if should_enforce.is_eq(&Boolean::TRUE).

This requires one constraint.

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impl<F: PrimeField> AllocVar<F, F> for AllocatedFp<F>

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fn new_variable<T: Borrow<F>>( cs: impl Into<Namespace<F>>, f: impl FnOnce() -> Result<T, SynthesisError>, mode: AllocationMode, ) -> Result<Self, SynthesisError>

Allocates a new variable of type Self in the ConstraintSystem cs. The mode of allocation is decided by mode.
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fn new_constant( cs: impl Into<Namespace<F>>, t: impl Borrow<V>, ) -> Result<Self, SynthesisError>

Allocates a new constant of type Self in the ConstraintSystem cs. Read more
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fn new_input<T: Borrow<V>>( cs: impl Into<Namespace<F>>, f: impl FnOnce() -> Result<T, SynthesisError>, ) -> Result<Self, SynthesisError>

Allocates a new public input of type Self in the ConstraintSystem cs.
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fn new_witness<T: Borrow<V>>( cs: impl Into<Namespace<F>>, f: impl FnOnce() -> Result<T, SynthesisError>, ) -> Result<Self, SynthesisError>

Allocates a new private witness of type Self in the ConstraintSystem cs.
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fn new_variable_with_inferred_mode<T: Borrow<V>>( cs: impl Into<Namespace<F>>, f: impl FnOnce() -> Result<T, SynthesisError>, ) -> Result<Self, SynthesisError>

Allocates a new constant or private witness of type Self in the ConstraintSystem cs with the allocation mode inferred from cs. A constant is allocated if cs is None, and a private witness is allocated otherwise. Read more
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impl<F: Clone + PrimeField> Clone for AllocatedFp<F>

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fn clone(&self) -> AllocatedFp<F>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<F: PrimeField> CondSelectGadget<F> for AllocatedFp<F>

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fn conditionally_select( cond: &Boolean<F>, true_val: &Self, false_val: &Self, ) -> Result<Self, SynthesisError>

If cond == &Boolean::TRUE, then this returns true_value; else, returns false_value. Read more
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fn conditionally_select_power_of_two_vector( position: &[Boolean<ConstraintF>], values: &[Self], ) -> Result<Self, SynthesisError>

Returns an element of values whose index in represented by position. position is an array of boolean that represents an unsigned integer in big endian order. Read more
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impl<F: Debug + PrimeField> Debug for AllocatedFp<F>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<F: PrimeField> From<AllocatedFp<F>> for FpVar<F>

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fn from(other: AllocatedFp<F>) -> Self

Converts to this type from the input type.
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impl<F: PrimeField> ThreeBitCondNegLookupGadget<F> for AllocatedFp<F>

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type TableConstant = F

The type of values being looked up.
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fn three_bit_cond_neg_lookup( b: &[Boolean<F>], b0b1: &Boolean<F>, c: &[Self::TableConstant], ) -> Result<Self, SynthesisError>

Interprets the slice bits as a two-bit integer b = bits[0] + (bits[1] << 1), and then outputs constants[b] * c, where c = if bits[2] { -1 } else { 1 };. Read more
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impl<F: PrimeField> ToBitsGadget<F> for AllocatedFp<F>



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fn to_bits_le(&self) -> Result<Vec<Boolean<F>>, SynthesisError>

Outputs the unique bit-wise decomposition of self in little-endian form.

This method enforces that the output is in the field, i.e. it invokes Boolean::enforce_in_field_le on the bit decomposition.

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fn to_non_unique_bits_le(&self) -> Result<Vec<Boolean<F>>, SynthesisError>

Outputs a possibly non-unique little-endian bit-wise representation of self. Read more
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fn to_bits_be(&self) -> Result<Vec<Boolean<F>>, SynthesisError>

Outputs the canonical big-endian bit-wise representation of self.
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fn to_non_unique_bits_be(&self) -> Result<Vec<Boolean<F>>, SynthesisError>

Outputs a possibly non-unique big-endian bit-wise representation of self.
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impl<F: PrimeField> ToBytesGadget<F> for AllocatedFp<F>

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fn to_bytes_le(&self) -> Result<Vec<UInt8<F>>, SynthesisError>

Outputs the unique byte decomposition of self in little-endian form.

This method enforces that the decomposition represents an integer that is less than F::MODULUS.

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fn to_non_unique_bytes_le(&self) -> Result<Vec<UInt8<F>>, SynthesisError>

Outputs a possibly non-unique byte decomposition of self. Read more
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impl<F: PrimeField> ToConstraintFieldGadget<F> for AllocatedFp<F>

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fn to_constraint_field(&self) -> Result<Vec<FpVar<F>>, SynthesisError>

Converts self to FpVar<ConstraintF> variables.
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impl<F: PrimeField> TwoBitLookupGadget<F> for AllocatedFp<F>

Uses two bits to perform a lookup into a table b is little-endian: b[0] is LSB.

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type TableConstant = F

The type of values being looked up.
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fn two_bit_lookup( b: &[Boolean<F>], c: &[Self::TableConstant], ) -> Result<Self, SynthesisError>

Interprets the slice bits as a two-bit integer b = bits[0] + (bits[1] << 1), and then outputs constants[b]. Read more

Auto Trait Implementations§

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impl<F> Freeze for AllocatedFp<F>
where F: Freeze,

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impl<F> !RefUnwindSafe for AllocatedFp<F>

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impl<F> !Send for AllocatedFp<F>

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impl<F> !Sync for AllocatedFp<F>

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impl<F> Unpin for AllocatedFp<F>
where F: Unpin,

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impl<F> !UnwindSafe for AllocatedFp<F>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more