signature

package
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 Go to latest Published: Jun 1, 2020 License: Apache-2.0 Imports: 21 Imported by: 0

Documentation

Overview

Package signature provides wrapper types around public key signatures.

Index

Constants

View Source 
const (
	// PublicKeySize is the size of a public key in bytes.
	PublicKeySize = ed25519.PublicKeySize

	// SignatureSize is the size of a signature in bytes.
	SignatureSize = ed25519.SignatureSize
)

Variables

View Source 
var (
	// ErrMalformedPublicKey is the error returned when a public key is
	// malformed.
	ErrMalformedPublicKey = errors.New("signature: malformed public key")

	// ErrMalformedSignature is the error returned when a signature is
	// malformed.
	ErrMalformedSignature = errors.New("signature: malformed signature")

	// ErrPublicKeyMismatch is the error returned when a signature was
	// not produced by the expected public key.
	ErrPublicKeyMismatch = errors.New("signature: public key mismatch")

	// ErrVerifyFailed is the error return when a signature verification
	// fails when opening a signed blob.
	ErrVerifyFailed = errors.New("signed: signature verification failed")
)
View Source 
var (
	// ErrNotExist is the error returned when a private key does not exist.
	ErrNotExist = os.ErrNotExist

	// ErrMalformedPrivateKey is the error returned when a private key is
	// malformed.
	ErrMalformedPrivateKey = errors.New("signature: malformed private key")

	// ErrRoleMismatch is the error returned when the signer factory role
	// is misconfigured.
	ErrRoleMismatch = errors.New("signature: signer factory role mismatch")

	// ErrRoleAction is the error returned when the signer role mismatches
	// the signing operations allowed by the role.
	ErrRoleAction = errors.New("signature: signer role action mismatch")

	// SignerRoles is the list of all supported signer roles.
	SignerRoles = []SignerRole{
		SignerEntity,
		SignerNode,
		SignerP2P,
		SignerConsensus,
	}
)

Functions

func BuildPublicKeyBlacklist 

func BuildPublicKeyBlacklist(allowTestKeys bool)

BuildPublicKeyBlacklist builds the public key blacklist.

func IsUnsafeUnregisteredContextsAllowed 

func IsUnsafeUnregisteredContextsAllowed() bool

IsUnsafeUnregisteredContextsAllowed returns true iff context registration checks are bypassed.

func PrepareSignerContext 

func PrepareSignerContext(context Context) ([]byte, error)

PrepareSignerContext prepares a context for use during signing by a Signer.

func PrepareSignerMessage 

func PrepareSignerMessage(context Context, message []byte) ([]byte, error)

PrepareSignerMessage prepares a context and message for signing by a Signer.

func RegisterTestPublicKey 

func RegisterTestPublicKey(pk PublicKey)

RegisterTestPublicKey registers a hardcoded test public key with the internal public key blacklist.

func SetChainContext 

func SetChainContext(rawContext string)

SetChainContext configures the chain domain separation context that is used with any contexts constructed using the WithChainSeparation option.

func UnsafeAllowUnregisteredContexts 

func UnsafeAllowUnregisteredContexts()

UnsafeAllowUnregisteredContexts bypasses the context registration check.

This function is only for the benefit of implementing a remote signer.

func UnsafeResetChainContext 

func UnsafeResetChainContext()

UnsafeResetChainContext resets the chain context.

This function should NOT be used during normal operation as changing the chain context while an application is running is unsafe. The main use case for having this function is unit tests.

func VerifyBatch 

func VerifyBatch(context Context, messages [][]byte, sigs []Signature) bool

VerifyBatch verifies multiple signatures, made by multiple public keys, against a single context and multiple messages, returning true iff every signature is valid.

func VerifyManyToOne 

func VerifyManyToOne(context Context, message []byte, sigs []Signature) bool

VerifyManyToOne verifies multiple signatures against a single context and message, returning true iff every signature is valid.

Types

type Context 

type Context string

Context is a domain separation context.

func NewContext 

func NewContext(rawContext string, opts ...ContextOption) Context

NewContext creates and registers a new context. This routine will panic if the context is malformed or is already registered.

type ContextOption 

type ContextOption func(*contextOptions)

ContextOption is a context configuration option.

func WithChainSeparation 

func WithChainSeparation() ContextOption

WithChainSeparation is a context option that enforces additional domain separation based on the ChainID.

type MultiSigned 

type MultiSigned struct {
	// Blob is the signed blob.
	Blob []byte `json:"untrusted_raw_value"`

	// Signatures are the signatures over the blob.
	Signatures []Signature `json:"signatures"`
}

MultiSigned is a blob signed by multiple public keys.

func SignMultiSigned 

func SignMultiSigned(signers []Signer, context Context, src interface{}) (*MultiSigned, error)

SignMultiSigned generates a MultiSigned with the Signers over the context and CBOR-serialized message.

func (*MultiSigned) IsOnlySignedBy 

func (s *MultiSigned) IsOnlySignedBy(pks []PublicKey) bool

IsOnlySignedBy returns true iff the MultiSigned is signed by all of the provided public keys, and none other.

Note: This does not verify the signature, and including the same key more than once in pks will always return false.

func (*MultiSigned) IsSignedBy 

func (s *MultiSigned) IsSignedBy(pk PublicKey) bool

IsSignedBy returns true iff the MultiSigned includes a signature for the provided public key.

Note: This does not verify the signature.

func (*MultiSigned) Open 

func (s *MultiSigned) Open(context Context, dst interface{}) error

Open first verifies the blob signatures, and then unmarshals the blob.

type PrettyMultiSigned 

type PrettyMultiSigned struct {
	Body       interface{} `json:"untrusted_raw_value"`
	Signatures []Signature `json:"signatures"`
}

PrettyMultiSigned is used for pretty-printing multi-signed messages so that the actual content is displayed instead of the binary blob.

It should only be used for pretty printing.

func NewPrettyMultiSigned 

func NewPrettyMultiSigned(s MultiSigned, b interface{}) *PrettyMultiSigned

NewPrettyMultiSigned creates a new PrettySigned instance that can be used for pretty printing multi-signed values.

func (PrettyMultiSigned) PrettyPrint 

func (p PrettyMultiSigned) PrettyPrint(prefix string, w io.Writer)

PrettyPrint writes a pretty-printed representation of the type to the given writer.

type PrettySigned 

type PrettySigned struct {
	Body      interface{} `json:"untrusted_raw_value"`
	Signature Signature   `json:"signature"`
}

PrettySigned is used for pretty-printing signed messages so that the actual content is displayed instead of the binary blob.

It should only be used for pretty printing.

func NewPrettySigned 

func NewPrettySigned(s Signed, b interface{}) *PrettySigned

NewPrettySigned creates a new PrettySigned instance that can be used for pretty printing signed values.

func (PrettySigned) PrettyPrint 

func (p PrettySigned) PrettyPrint(prefix string, w io.Writer)

PrettyPrint writes a pretty-printed representation of the type to the given writer.

type PublicKey 

type PublicKey [PublicKeySize]byte

PublicKey is a public key used for signing.

func NewBlacklistedKey 

func NewBlacklistedKey(hex string) PublicKey

NewBlacklistedKey returns the PublicKey from the given hex or panics. The given key is also added to the blacklist.

func (PublicKey) Blacklist 

func (k PublicKey) Blacklist() error

Blacklist adds the public key to the blacklist.

func (PublicKey) Equal 

func (k PublicKey) Equal(cmp PublicKey) bool

Equal compares vs another public key for equality.

func (PublicKey) Hash 

func (k PublicKey) Hash() hash.Hash

Hash returns a cryptographic hash of the public key.

func (PublicKey) IsBlacklisted 

func (k PublicKey) IsBlacklisted() bool

IsBlacklisted returns true iff the public key is blacklisted, prohibiting it from use.

func (PublicKey) IsValid 

func (k PublicKey) IsValid() bool

IsValid checks whether the public key is well-formed.

func (*PublicKey) LoadPEM 

func (k *PublicKey) LoadPEM(fn string, signer Signer) error

LoadPEM loads a public key from a PEM file on disk. Iff the public key is missing and a Signer is provided, the Signer's corresponding public key will be written and loaded.

func (PublicKey) MarshalBinary 

func (k PublicKey) MarshalBinary() (data []byte, err error)

MarshalBinary encodes a public key into binary form.

func (PublicKey) MarshalPEM 

func (k PublicKey) MarshalPEM() (data []byte, err error)

MarshalPEM encodes a PublicKey into PEM form.

func (PublicKey) MarshalText 

func (k PublicKey) MarshalText() (data []byte, err error)

MarshalText encodes a public key into text form.

func (PublicKey) String 

func (k PublicKey) String() string

String returns a string representation of the public key.

func (*PublicKey) UnmarshalBinary 

func (k *PublicKey) UnmarshalBinary(data []byte) error

UnmarshalBinary decodes a binary marshaled public key.

func (*PublicKey) UnmarshalHex 

func (k *PublicKey) UnmarshalHex(text string) error

UnmarshalHex deserializes a hexadecimal text string into the given type.

func (*PublicKey) UnmarshalPEM 

func (k *PublicKey) UnmarshalPEM(data []byte) error

UnmarshalPEM decodes a PEM marshaled PublicKey.

func (*PublicKey) UnmarshalText 

func (k *PublicKey) UnmarshalText(text []byte) error

UnmarshalText decodes a text marshaled public key.

func (PublicKey) Verify 

func (k PublicKey) Verify(context Context, message, sig []byte) bool

Verify returns true iff the signature is valid for the public key over the context and message.

type RawSignature 

type RawSignature [SignatureSize]byte

RawSignature is a raw signature.

func (RawSignature) Equal 

func (r RawSignature) Equal(cmp RawSignature) bool

Equal compares vs another public key for equality.

func (RawSignature) MarshalBinary 

func (r RawSignature) MarshalBinary() (data []byte, err error)

MarshalBinary encodes a signature into binary form.

func (RawSignature) MarshalPEM 

func (r RawSignature) MarshalPEM() (data []byte, err error)

MarshalPEM encodes a raw signature into PEM format.

func (RawSignature) MarshalText 

func (r RawSignature) MarshalText() (data []byte, err error)

MarshalText encodes a signature into text form.

func (RawSignature) String 

func (r RawSignature) String() string

String returns a string representation of the raw signature.

func (*RawSignature) UnmarshalBinary 

func (r *RawSignature) UnmarshalBinary(data []byte) error

UnmarshalBinary decodes a binary marshaled signature.

func (*RawSignature) UnmarshalPEM 

func (r *RawSignature) UnmarshalPEM(data []byte) error

UnmarshalPEM decodes a PEM marshaled raw signature.

func (*RawSignature) UnmarshalText 

func (r *RawSignature) UnmarshalText(text []byte) error

UnmarshalText decodes a text marshaled signature.

type Signature 

type Signature struct {
	// PublicKey is the public key that produced the signature.
	PublicKey PublicKey `json:"public_key"`

	// Signature is the actual raw signature.
	Signature RawSignature `json:"signature"`
}

Signature is a signature, bundled with the signing public key.

func Sign 

func Sign(signer Signer, context Context, message []byte) (*Signature, error)

Sign generates a signature with the private key over the context and message.

func (*Signature) Equal 

func (s *Signature) Equal(cmp *Signature) bool

Equal compares vs another signature for equality.

func (Signature) MarshalPEM 

func (s Signature) MarshalPEM() (data []byte, err error)

MarshalPEM encodes a signature into PEM format.

func (*Signature) SanityCheck 

func (s *Signature) SanityCheck(expectedPubKey PublicKey) error

SanityCheck checks if the signature appears to be well formed.

func (*Signature) UnmarshalPEM 

func (s *Signature) UnmarshalPEM(data []byte) error

UnmarshalPem decodes a PEM marshaled signature.

func (*Signature) Verify 

func (s *Signature) Verify(context Context, message []byte) bool

Verify returns true iff the signature is valid over the given context and message.

type Signed 

type Signed struct {
	// Blob is the signed blob.
	Blob []byte `json:"untrusted_raw_value"`

	// Signature is the signature over blob.
	Signature Signature `json:"signature"`
}

Signed is a signed blob.

func SignSigned 

func SignSigned(signer Signer, context Context, src interface{}) (*Signed, error)

SignSigned generates a Signed with the Signer over the context and CBOR-serialized message.

func (*Signed) Open 

func (s *Signed) Open(context Context, dst interface{}) error

Open first verifies the blob signature and then unmarshals the blob.

type SignedPublicKey 

type SignedPublicKey struct {
	Signed
}

SignedPublicKey is a signed blob containing a PublicKey.

func (*SignedPublicKey) Open 

func (s *SignedPublicKey) Open(context Context, pub *PublicKey) error

Open first verifies the blob signature and then unmarshals the blob.

type Signer 

type Signer interface {
	// Public returns the PublicKey corresponding to the signer.
	Public() PublicKey

	// ContextSign generates a signature with the private key over the context and
	// message.
	ContextSign(context Context, message []byte) ([]byte, error)

	// String returns the string representation of a Signer, which MUST not
	// include any sensitive information.
	String() string

	// Reset tears down the Signer and obliterates any sensitive state if any.
	Reset()
}

Signer is an opaque interface for private keys that is capable of producing signatures, in the spirit of `crypto.Signer`.

type SignerFactory 

type SignerFactory interface {
	// EnsureRole ensures that the SignerFactory is configured for the given
	// role.
	EnsureRole(role SignerRole) error

	// Generate will generate and persist an new private key corresponding to
	// the provided role, and return a Signer ready for use.  Certain
	// implementations require an entropy source to be provided.
	Generate(role SignerRole, rng io.Reader) (Signer, error)

	// Load will load the private key corresonding to the provided role, and
	// return a Signer ready for use.
	Load(role SignerRole) (Signer, error)
}

SignerFactory is the opaque factory interface for Signers.

type SignerFactoryCtor 

type SignerFactoryCtor func(interface{}, ...SignerRole) (SignerFactory, error)

SignerFactoryCtor is an SignerFactory constructor.

type SignerRole 

type SignerRole int

SignerRole is the role of the Signer (Entity, Node, etc). 

const (
	SignerUnknown SignerRole = iota
	SignerEntity
	SignerNode
	SignerP2P
	SignerConsensus
)

func (*SignerRole) FromString 

func (role *SignerRole) FromString(str string) error

type UnsafeSigner 

type UnsafeSigner interface {
	Signer

	// UnsafeBytes returns the byte representation of the private key.
	UnsafeBytes() []byte
}

UnsafeSigner is a Signer that also supports access to the raw private key, primarily for testing.

Source Files

View all Source files

Directories

Path Synopsis
signers
composite
Package composite provides a composite signer.
 Package composite provides a composite signer.
file
Package file provides a PEM file backed signer.
 Package file provides a PEM file backed signer.
ledger
Package ledger provides a Ledger backed signer.
 Package ledger provides a Ledger backed signer.
memory
Package memory provides a memory backed Signer, primarily for use in testing.
 Package memory provides a memory backed Signer, primarily for use in testing.
remote
Package remote provides a gRPC backed signer (both client and server).
 Package remote provides a gRPC backed signer (both client and server).

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