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// Copyright (c) 2020 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package ecdsa
// ErrorKind identifies a kind of error. It has full support for
// errors.Is and errors.As, so the caller can directly check against
// an error kind when determining the reason for an error.
type ErrorKind string
// These constants are used to identify a specific Error.
const (
// ErrSigTooShort is returned when a signature that should be a DER
// signature is too short.
ErrSigTooShort = ErrorKind("ErrSigTooShort")
// ErrSigTooLong is returned when a signature that should be a DER signature
// is too long.
ErrSigTooLong = ErrorKind("ErrSigTooLong")
// ErrSigInvalidSeqID is returned when a signature that should be a DER
// signature does not have the expected ASN.1 sequence ID.
ErrSigInvalidSeqID = ErrorKind("ErrSigInvalidSeqID")
// ErrSigInvalidDataLen is returned when a signature that should be a DER
// signature does not specify the correct number of remaining bytes for the
// R and S portions.
ErrSigInvalidDataLen = ErrorKind("ErrSigInvalidDataLen")
// ErrSigMissingSTypeID is returned when a signature that should be a DER
// signature does not provide the ASN.1 type ID for S.
ErrSigMissingSTypeID = ErrorKind("ErrSigMissingSTypeID")
// ErrSigMissingSLen is returned when a signature that should be a DER
// signature does not provide the length of S.
ErrSigMissingSLen = ErrorKind("ErrSigMissingSLen")
// ErrSigInvalidSLen is returned when a signature that should be a DER
// signature does not specify the correct number of bytes for the S portion.
ErrSigInvalidSLen = ErrorKind("ErrSigInvalidSLen")
// ErrSigInvalidRIntID is returned when a signature that should be a DER
// signature does not have the expected ASN.1 integer ID for R.
ErrSigInvalidRIntID = ErrorKind("ErrSigInvalidRIntID")
// ErrSigZeroRLen is returned when a signature that should be a DER
// signature has an R length of zero.
ErrSigZeroRLen = ErrorKind("ErrSigZeroRLen")
// ErrSigNegativeR is returned when a signature that should be a DER
// signature has a negative value for R.
ErrSigNegativeR = ErrorKind("ErrSigNegativeR")
// ErrSigTooMuchRPadding is returned when a signature that should be a DER
// signature has too much padding for R.
ErrSigTooMuchRPadding = ErrorKind("ErrSigTooMuchRPadding")
// ErrSigRIsZero is returned when a signature has R set to the value zero.
ErrSigRIsZero = ErrorKind("ErrSigRIsZero")
// ErrSigRTooBig is returned when a signature has R with a value that is
// greater than or equal to the group order.
ErrSigRTooBig = ErrorKind("ErrSigRTooBig")
// ErrSigInvalidSIntID is returned when a signature that should be a DER
// signature does not have the expected ASN.1 integer ID for S.
ErrSigInvalidSIntID = ErrorKind("ErrSigInvalidSIntID")
// ErrSigZeroSLen is returned when a signature that should be a DER
// signature has an S length of zero.
ErrSigZeroSLen = ErrorKind("ErrSigZeroSLen")
// ErrSigNegativeS is returned when a signature that should be a DER
// signature has a negative value for S.
ErrSigNegativeS = ErrorKind("ErrSigNegativeS")
// ErrSigTooMuchSPadding is returned when a signature that should be a DER
// signature has too much padding for S.
ErrSigTooMuchSPadding = ErrorKind("ErrSigTooMuchSPadding")
// ErrSigSIsZero is returned when a signature has S set to the value zero.
ErrSigSIsZero = ErrorKind("ErrSigSIsZero")
// ErrSigSTooBig is returned when a signature has S with a value that is
// greater than or equal to the group order.
ErrSigSTooBig = ErrorKind("ErrSigSTooBig")
)
// Error satisfies the error interface and prints human-readable errors.
func (e ErrorKind) Error() string {
return string(e)
}
// Error identifies an error related to an ECDSA signature. It has full
// support for errors.Is and errors.As, so the caller can ascertain the
// specific reason for the error by checking the underlying error.
type Error struct {
Err error
Description string
}
// Error satisfies the error interface and prints human-readable errors.
func (e Error) Error() string {
return e.Description
}
// Unwrap returns the underlying wrapped error.
func (e Error) Unwrap() error {
return e.Err
}
// signatureError creates an Error given a set of arguments.
func signatureError(kind ErrorKind, desc string) Error {
return Error{Err: kind, Description: desc}
}
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