60 lines
2.7 KiB
Go
60 lines
2.7 KiB
Go
|
// Copyright (c) 2013-2014 The btcsuite developers
|
||
|
|
// Copyright (c) 2015-2022 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 in
|
||
|
|
pure Go.
|
||
|
|
|
||
|
|
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
|