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+// Copyright (c) 2013-2014 The btcsuite developers
+// Copyright (c) 2015-2019 The Decred developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+Package secp256k1 implements optimized secp256k1 elliptic curve operations.
+
+This package provides an optimized pure Go implementation of elliptic curve
+cryptography operations over the secp256k1 curve as well as data structures and
+functions for working with public and private secp256k1 keys.  See
+https://www.secg.org/sec2-v2.pdf for details on the standard.
+
+In addition, sub packages are provided to produce, verify, parse, and serialize
+ECDSA signatures and EC-Schnorr-DCRv0 (a custom Schnorr-based signature scheme
+specific to Decred) signatures.  See the README.md files in the relevant sub
+packages for more details about those aspects.
+
+An overview of the features provided by this package are as follows:
+
+ - Private key generation, serialization, and parsing
+ - Public key generation, serialization and parsing per ANSI X9.62-1998
+   - Parses uncompressed, compressed, and hybrid public keys
+   - Serializes uncompressed and compressed public keys
+ - Specialized types for performing optimized and constant time field operations
+   - FieldVal type for working modulo the secp256k1 field prime
+   - ModNScalar type for working modulo the secp256k1 group order
+ - Elliptic curve operations in Jacobian projective coordinates
+   - Point addition
+   - Point doubling
+   - Scalar multiplication with an arbitrary point
+   - Scalar multiplication with the base point (group generator)
+ - Point decompression from a given x coordinate
+ - Nonce generation via RFC6979 with support for extra data and version
+   information that can be used to prevent nonce reuse between signing
+   algorithms
+
+It also provides an implementation of the Go standard library crypto/elliptic
+Curve interface via the S256 function so that it may be used with other packages
+in the standard library such as crypto/tls, crypto/x509, and crypto/ecdsa.
+However, in the case of ECDSA, it is highly recommended to use the ecdsa sub
+package of this package instead since it is optimized specifically for secp256k1
+and is significantly faster as a result.
+
+Although this package was primarily written for dcrd, it has intentionally been
+designed so it can be used as a standalone package for any projects needing to
+use optimized secp256k1 elliptic curve cryptography.
+
+Finally, a comprehensive suite of tests is provided to provide a high level of
+quality assurance.
+
+Use of secp256k1 in Decred
+
+At the time of this writing, the primary public key cryptography in widespread
+use on the Decred network used to secure coins is based on elliptic curves
+defined by the secp256k1 domain parameters.
+*/
+package secp256k1