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use crate::String;
/// The error type for `PolynomialCommitment`.
#[derive(Debug)]
pub enum Error {
/// The query set contains a label for a polynomial that was not provided as
/// input to the `PC::open`.
MissingPolynomial {
/// The label of the missing polynomial.
label: String,
},
/// `Evaluations` does not contain an evaluation for the polynomial labelled
/// `label` at a particular query.
MissingEvaluation {
/// The label of the missing polynomial.
label: String,
},
/// The LHS of the equation is empty.
MissingLHS {
/// The label of the equation.
label: String,
},
/// The provided polynomial was meant to be hiding, but `rng` was `None`.
MissingRng,
/// The degree provided in setup was too small; degree 0 polynomials
/// are not supported.
DegreeIsZero,
/// The degree of the polynomial passed to `commit` or `open`
/// was too large.
TooManyCoefficients {
/// The number of coefficients in the polynomial.
num_coefficients: usize,
/// The maximum number of powers provided in `Powers`.
num_powers: usize,
},
/// The hiding bound was not `None`, but the hiding bound was zero.
HidingBoundIsZero,
/// The hiding bound was too large for the given `Powers`.
HidingBoundToolarge {
/// The hiding bound
hiding_poly_degree: usize,
/// The number of powers.
num_powers: usize,
},
/// The degree provided to `trim` was too large.
TrimmingDegreeTooLarge,
/// The provided `enforced_degree_bounds` was `Some<&[]>`.
EmptyDegreeBounds,
/// The provided equation contained multiple polynomials, of which least one
/// had a strict degree bound.
EquationHasDegreeBounds(String),
/// The required degree bound is not supported by ck/vk
UnsupportedDegreeBound(usize),
/// The degree bound for the `index`-th polynomial passed to `commit`, `open`
/// or `check` was incorrect, that is, `degree_bound >= poly_degree` or
/// `degree_bound <= max_degree`.
IncorrectDegreeBound {
/// Degree of the polynomial.
poly_degree: usize,
/// Degree bound.
degree_bound: usize,
/// Maximum supported degree.
supported_degree: usize,
/// Index of the offending polynomial.
label: String,
},
/// The inputs to `commit`, `open` or `verify` had incorrect lengths.
IncorrectInputLength(String),
/// An invalid number of variables was provided to `setup`
InvalidNumberOfVariables,
/// The degree of the `index`-th polynomial passed to `commit`, `open`
/// or `check` was incorrect, that is, `supported_degree <= poly_degree`
PolynomialDegreeTooLarge {
/// Degree of the polynomial.
poly_degree: usize,
/// Maximum supported degree.
supported_degree: usize,
/// Index of the offending polynomial.
label: String,
},
}
impl core::fmt::Display for Error {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
match self {
Error::MissingPolynomial { label } => write!(
f,
"`QuerySet` refers to polynomial \"{}\", but it was not provided.",
label
),
Error::MissingEvaluation { label } => write!(
f,
"`QuerySet` refers to polynomial \"{}\", but `Evaluations` does not contain an evaluation for it.",
label
),
Error::MissingLHS { label } => {
write!(f, "Equation \"{}\" does not have a LHS.", label)
},
Error::MissingRng => write!(f, "hiding commitments require `Some(rng)`"),
Error::DegreeIsZero => write!(
f,
"this scheme does not support committing to degree 0 polynomials"
),
Error::TooManyCoefficients {
num_coefficients,
num_powers,
} => write!(
f,
"the number of coefficients in the polynomial ({:?}) is greater than\
the maximum number of powers in `Powers` ({:?})",
num_coefficients, num_powers
),
Error::HidingBoundIsZero => write!(
f,
"this scheme does not support non-`None` hiding bounds that are 0"
),
Error::HidingBoundToolarge {
hiding_poly_degree,
num_powers,
} => write!(
f,
"the degree of the hiding poly ({:?}) is not less than the maximum number of powers in `Powers` ({:?})",
hiding_poly_degree, num_powers
),
Error::TrimmingDegreeTooLarge => {
write!(f, "the degree provided to `trim` was too large")
}
Error::EmptyDegreeBounds => {
write!(f, "provided `enforced_degree_bounds` was `Some<&[]>`")
}
Error::EquationHasDegreeBounds(e) => write!(
f,
"the eqaution \"{}\" contained degree-bounded polynomials",
e
),
Error::UnsupportedDegreeBound(bound) => write!(
f,
"the degree bound ({:?}) is not supported by the parameters",
bound,
),
Error::IncorrectDegreeBound {
poly_degree,
degree_bound,
supported_degree,
label,
} => write!(
f,
"the degree bound ({:?}) for the polynomial {} \
(having degree {:?}) is greater than the maximum \
supported degree ({:?})",
degree_bound, label, poly_degree, supported_degree
),
Error::InvalidNumberOfVariables => write!(
f,
"An invalid number of variables was provided to `setup`"
),
Error::PolynomialDegreeTooLarge {
poly_degree,
supported_degree,
label,
} => write!(
f,
"the polynomial {} has degree {:?}, but parameters only
support up to degree ({:?})", label, poly_degree, supported_degree
),
Error::IncorrectInputLength(err) => write!(f, "{}", err),
}
}
}
impl ark_std::error::Error for Error {}