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diff --git a/cli/vendor/github.com/decred/dcrd/dcrec/secp256k1/v4/error.go b/cli/vendor/github.com/decred/dcrd/dcrec/secp256k1/v4/error.go
new file mode 100644
index 0000000..ac8c451
--- /dev/null
+++ b/cli/vendor/github.com/decred/dcrd/dcrec/secp256k1/v4/error.go
@@ -0,0 +1,67 @@
+// 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 secp256k1
+
+// 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 RuleError.
+const (
+	// ErrPubKeyInvalidLen indicates that the length of a serialized public
+	// key is not one of the allowed lengths.
+	ErrPubKeyInvalidLen = ErrorKind("ErrPubKeyInvalidLen")
+
+	// ErrPubKeyInvalidFormat indicates an attempt was made to parse a public
+	// key that does not specify one of the supported formats.
+	ErrPubKeyInvalidFormat = ErrorKind("ErrPubKeyInvalidFormat")
+
+	// ErrPubKeyXTooBig indicates that the x coordinate for a public key
+	// is greater than or equal to the prime of the field underlying the group.
+	ErrPubKeyXTooBig = ErrorKind("ErrPubKeyXTooBig")
+
+	// ErrPubKeyYTooBig indicates that the y coordinate for a public key is
+	// greater than or equal to the prime of the field underlying the group.
+	ErrPubKeyYTooBig = ErrorKind("ErrPubKeyYTooBig")
+
+	// ErrPubKeyNotOnCurve indicates that a public key is not a point on the
+	// secp256k1 curve.
+	ErrPubKeyNotOnCurve = ErrorKind("ErrPubKeyNotOnCurve")
+
+	// ErrPubKeyMismatchedOddness indicates that a hybrid public key specified
+	// an oddness of the y coordinate that does not match the actual oddness of
+	// the provided y coordinate.
+	ErrPubKeyMismatchedOddness = ErrorKind("ErrPubKeyMismatchedOddness")
+)
+
+// Error satisfies the error interface and prints human-readable errors.
+func (e ErrorKind) Error() string {
+	return string(e)
+}
+
+// Error identifies an error related to public key cryptography using a
+// sec256k1 curve. 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
+}
+
+// makeError creates an Error given a set of arguments.
+func makeError(kind ErrorKind, desc string) Error {
+	return Error{Err: kind, Description: desc}
+}