mirror of https://github.com/cheat/cheat.git
111 lines
3.2 KiB
Go
111 lines
3.2 KiB
Go
// Package sign provides unified interfaces for signature schemes.
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//
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// A register of schemes is available in the package
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//
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// github.com/cloudflare/circl/sign/schemes
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package sign
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import (
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"crypto"
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"encoding"
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"errors"
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)
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type SignatureOpts struct {
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// If non-empty, includes the given context in the signature if supported
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// and will cause an error during signing otherwise.
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Context string
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}
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// A public key is used to verify a signature set by the corresponding private
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// key.
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type PublicKey interface {
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// Returns the signature scheme for this public key.
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Scheme() Scheme
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Equal(crypto.PublicKey) bool
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encoding.BinaryMarshaler
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crypto.PublicKey
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}
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// A private key allows one to create signatures.
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type PrivateKey interface {
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// Returns the signature scheme for this private key.
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Scheme() Scheme
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Equal(crypto.PrivateKey) bool
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// For compatibility with Go standard library
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crypto.Signer
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crypto.PrivateKey
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encoding.BinaryMarshaler
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}
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// A Scheme represents a specific instance of a signature scheme.
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type Scheme interface {
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// Name of the scheme.
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Name() string
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// GenerateKey creates a new key-pair.
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GenerateKey() (PublicKey, PrivateKey, error)
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// Creates a signature using the PrivateKey on the given message and
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// returns the signature. opts are additional options which can be nil.
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//
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// Panics if key is nil or wrong type or opts context is not supported.
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Sign(sk PrivateKey, message []byte, opts *SignatureOpts) []byte
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// Checks whether the given signature is a valid signature set by
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// the private key corresponding to the given public key on the
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// given message. opts are additional options which can be nil.
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//
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// Panics if key is nil or wrong type or opts context is not supported.
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Verify(pk PublicKey, message []byte, signature []byte, opts *SignatureOpts) bool
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// Deterministically derives a keypair from a seed. If you're unsure,
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// you're better off using GenerateKey().
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//
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// Panics if seed is not of length SeedSize().
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DeriveKey(seed []byte) (PublicKey, PrivateKey)
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// Unmarshals a PublicKey from the provided buffer.
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UnmarshalBinaryPublicKey([]byte) (PublicKey, error)
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// Unmarshals a PublicKey from the provided buffer.
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UnmarshalBinaryPrivateKey([]byte) (PrivateKey, error)
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// Size of binary marshalled public keys.
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PublicKeySize() int
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// Size of binary marshalled public keys.
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PrivateKeySize() int
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// Size of signatures.
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SignatureSize() int
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// Size of seeds.
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SeedSize() int
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// Returns whether contexts are supported.
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SupportsContext() bool
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}
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var (
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// ErrTypeMismatch is the error used if types of, for instance, private
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// and public keys don't match.
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ErrTypeMismatch = errors.New("types mismatch")
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// ErrSeedSize is the error used if the provided seed is of the wrong
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// size.
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ErrSeedSize = errors.New("wrong seed size")
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// ErrPubKeySize is the error used if the provided public key is of
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// the wrong size.
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ErrPubKeySize = errors.New("wrong size for public key")
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// ErrPrivKeySize is the error used if the provided private key is of
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// the wrong size.
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ErrPrivKeySize = errors.New("wrong size for private key")
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// ErrContextNotSupported is the error used if a context is not
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// supported.
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ErrContextNotSupported = errors.New("context not supported")
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)
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