60 lines
2.7 KiB
Go
60 lines
2.7 KiB
Go
// Copyright (c) 2013-2014 The btcsuite developers
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// Copyright (c) 2015-2022 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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/*
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Package secp256k1 implements optimized secp256k1 elliptic curve operations in
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pure Go.
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This package provides an optimized pure Go implementation of elliptic curve
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cryptography operations over the secp256k1 curve as well as data structures and
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functions for working with public and private secp256k1 keys. See
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https://www.secg.org/sec2-v2.pdf for details on the standard.
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In addition, sub packages are provided to produce, verify, parse, and serialize
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ECDSA signatures and EC-Schnorr-DCRv0 (a custom Schnorr-based signature scheme
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specific to Decred) signatures. See the README.md files in the relevant sub
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packages for more details about those aspects.
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An overview of the features provided by this package are as follows:
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- Private key generation, serialization, and parsing
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- Public key generation, serialization and parsing per ANSI X9.62-1998
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- Parses uncompressed, compressed, and hybrid public keys
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- Serializes uncompressed and compressed public keys
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- Specialized types for performing optimized and constant time field operations
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- FieldVal type for working modulo the secp256k1 field prime
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- ModNScalar type for working modulo the secp256k1 group order
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- Elliptic curve operations in Jacobian projective coordinates
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- Point addition
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- Point doubling
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- Scalar multiplication with an arbitrary point
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- Scalar multiplication with the base point (group generator)
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- Point decompression from a given x coordinate
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- Nonce generation via RFC6979 with support for extra data and version
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information that can be used to prevent nonce reuse between signing
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algorithms
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It also provides an implementation of the Go standard library crypto/elliptic
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Curve interface via the S256 function so that it may be used with other packages
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in the standard library such as crypto/tls, crypto/x509, and crypto/ecdsa.
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However, in the case of ECDSA, it is highly recommended to use the ecdsa sub
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package of this package instead since it is optimized specifically for secp256k1
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and is significantly faster as a result.
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Although this package was primarily written for dcrd, it has intentionally been
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designed so it can be used as a standalone package for any projects needing to
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use optimized secp256k1 elliptic curve cryptography.
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Finally, a comprehensive suite of tests is provided to provide a high level of
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quality assurance.
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# Use of secp256k1 in Decred
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At the time of this writing, the primary public key cryptography in widespread
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use on the Decred network used to secure coins is based on elliptic curves
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defined by the secp256k1 domain parameters.
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*/
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package secp256k1
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