55 lines
2.8 KiB
Markdown
55 lines
2.8 KiB
Markdown
# secp256k1
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> Due to the terrible state of the btcec library, and the ethical character of
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> dcred, the two main secp256k1 EC libraries in the Go language, it has become
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> necessary to refactor and clean up the mess of btcec's module versioning.
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>
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> In addition, the code has been updated to use several new features of Go that
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> were added to the language since these libraries were first created, notably the
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> precomps are here directly generated as binary data instead of nasty base64
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> source code.
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Package secp256k1 implements optimized secp256k1 elliptic curve operations.
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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 secret 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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- Secret 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 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
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packages in the standard library such as `crypto/tls`, `crypto/x509`, and
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`crypto/ecdsa`. However, in the case of ECDSA, it is highly recommended to use
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the `ecdsa` sub package of this package instead since it is optimized
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specifically for secp256k1 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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