crypto

package
v0.2.2 Latest Latest
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 Go to latest Published: Aug 6, 2019 License: Apache-2.0, MIT Imports: 24 Imported by: 1,177

Documentation

Overview

Package crypto implements various cryptographic utilities used by libp2p. This includes a Public and Private key interface and key implementations for supported key algorithms.

Index

Constants

View Source 
const (
	// RSA is an enum for the supported RSA key type
	RSA = iota
	// Ed25519 is an enum for the supported Ed25519 key type
	Ed25519
	// Secp256k1 is an enum for the supported Secp256k1 key type
	Secp256k1
	// ECDSA is an enum for the supported ECDSA key type
	ECDSA
)
View Source 
const WeakRsaKeyEnv = "LIBP2P_ALLOW_WEAK_RSA_KEYS"

WeakRsaKeyEnv is an environment variable which, when set, lowers the minimum required bits of RSA keys to 512. This should be used exclusively in test situations.

Variables

View Source 
var (
	// ErrNotECDSAPubKey is returned when the public key passed is not an ecdsa public key
	ErrNotECDSAPubKey = errors.New("not an ecdsa public key")
	// ErrNilSig is returned when the signature is nil
	ErrNilSig = errors.New("sig is nil")
	// ErrNilPrivateKey is returned when a nil private key is provided
	ErrNilPrivateKey = errors.New("private key is nil")
	// ECDSACurve is the default ecdsa curve used
	ECDSACurve = elliptic.P256()
)
View Source 
var (
	// ErrBadKeyType is returned when a key is not supported
	ErrBadKeyType = errors.New("invalid or unsupported key type")
	// KeyTypes is a list of supported keys
	KeyTypes = []int{
		RSA,
		Ed25519,
		Secp256k1,
		ECDSA,
	}
)
View Source 
var ErrRsaKeyTooSmall error

ErrRsaKeyTooSmall is returned when trying to generate or parse an RSA key that's smaller than MinRsaKeyBits bits. In test

View Source 
var MinRsaKeyBits = 2048
View Source 
var PrivKeyUnmarshallers = map[pb.KeyType]PrivKeyUnmarshaller{
	pb.KeyType_RSA:       UnmarshalRsaPrivateKey,
	pb.KeyType_Ed25519:   UnmarshalEd25519PrivateKey,
	pb.KeyType_Secp256k1: UnmarshalSecp256k1PrivateKey,
	pb.KeyType_ECDSA:     UnmarshalECDSAPrivateKey,
}

PrivKeyUnmarshallers is a map of unmarshallers by key type

View Source 
var PubKeyUnmarshallers = map[pb.KeyType]PubKeyUnmarshaller{
	pb.KeyType_RSA:       UnmarshalRsaPublicKey,
	pb.KeyType_Ed25519:   UnmarshalEd25519PublicKey,
	pb.KeyType_Secp256k1: UnmarshalSecp256k1PublicKey,
	pb.KeyType_ECDSA:     UnmarshalECDSAPublicKey,
}

PubKeyUnmarshallers is a map of unmarshallers by key type

Functions

func ConfigDecodeKey 

func ConfigDecodeKey(b string) ([]byte, error)

ConfigDecodeKey decodes from b64 (for config file), and unmarshals.

func ConfigEncodeKey 

func ConfigEncodeKey(b []byte) string

ConfigEncodeKey encodes to b64 (for config file), and marshals.

func ECDSAKeyPairFromKey 

func ECDSAKeyPairFromKey(priv *ecdsa.PrivateKey) (PrivKey, PubKey, error)

ECDSAKeyPairFromKey generates a new ecdsa private and public key from an input private key

func GenerateECDSAKeyPair 

func GenerateECDSAKeyPair(src io.Reader) (PrivKey, PubKey, error)

GenerateECDSAKeyPair generates a new ecdsa private and public key

func GenerateECDSAKeyPairWithCurve 

func GenerateECDSAKeyPairWithCurve(curve elliptic.Curve, src io.Reader) (PrivKey, PubKey, error)

GenerateECDSAKeyPairWithCurve generates a new ecdsa private and public key with a speicified curve

func GenerateEd25519Key 

func GenerateEd25519Key(src io.Reader) (PrivKey, PubKey, error)

GenerateEd25519Key generates a new ed25519 private and public key pair.

func GenerateKeyPair 

func GenerateKeyPair(typ, bits int) (PrivKey, PubKey, error)

GenerateKeyPair generates a private and public key

func GenerateKeyPairWithReader 

func GenerateKeyPairWithReader(typ, bits int, src io.Reader) (PrivKey, PubKey, error)

GenerateKeyPairWithReader returns a keypair of the given type and bitsize

func GenerateRSAKeyPair 

func GenerateRSAKeyPair(bits int, src io.Reader) (PrivKey, PubKey, error)

GenerateRSAKeyPair generates a new rsa private and public key

func GenerateSecp256k1Key 

func GenerateSecp256k1Key(src io.Reader) (PrivKey, PubKey, error)

GenerateSecp256k1Key generates a new Secp256k1 private and public key pair

func KeyEqual 

func KeyEqual(k1, k2 Key) bool

KeyEqual checks whether two Keys are equivalent (have identical byte representations).

func KeyStretcher 

func KeyStretcher(cipherType string, hashType string, secret []byte) (StretchedKeys, StretchedKeys)

KeyStretcher returns a set of keys for each party by stretching the shared key. (myIV, theirIV, myCipherKey, theirCipherKey, myMACKey, theirMACKey). This function accepts the following cipher types: - AES-128 - AES-256 The function will panic upon receiving an unknown cipherType

func MarshalECDSAPrivateKey 

func MarshalECDSAPrivateKey(ePriv ECDSAPrivateKey) ([]byte, error)

MarshalECDSAPrivateKey returns x509 bytes from a private key

func MarshalECDSAPublicKey 

func MarshalECDSAPublicKey(ePub ECDSAPublicKey) ([]byte, error)

MarshalECDSAPublicKey returns x509 bytes from a public key

func MarshalPrivateKey 

func MarshalPrivateKey(k PrivKey) ([]byte, error)

MarshalPrivateKey converts a key object into its protobuf serialized form.

func MarshalPublicKey 

func MarshalPublicKey(k PubKey) ([]byte, error)

MarshalPublicKey converts a public key object into a protobuf serialized public key

func PublicKeyToProto 

func PublicKeyToProto(k PubKey) (*pb.PublicKey, error)

PublicKeyToProto converts a public key object into an unserialized protobuf PublicKey message.

Types

type ECDSAPrivateKey 

type ECDSAPrivateKey struct {
	// contains filtered or unexported fields
}

ECDSAPrivateKey is an implementation of an ECDSA private key

func (*ECDSAPrivateKey) Bytes 

func (ePriv *ECDSAPrivateKey) Bytes() ([]byte, error)

Bytes returns the private key as protobuf bytes

func (*ECDSAPrivateKey) Equals 

func (ePriv *ECDSAPrivateKey) Equals(o Key) bool

Equals compares two private keys

func (*ECDSAPrivateKey) GetPublic 

func (ePriv *ECDSAPrivateKey) GetPublic() PubKey

GetPublic returns a public key

func (*ECDSAPrivateKey) Raw 

func (ePriv *ECDSAPrivateKey) Raw() ([]byte, error)

Raw returns x509 bytes from a private key

func (*ECDSAPrivateKey) Sign 

func (ePriv *ECDSAPrivateKey) Sign(data []byte) ([]byte, error)

Sign returns the signature of the input data

func (*ECDSAPrivateKey) Type 

func (ePriv *ECDSAPrivateKey) Type() pb.KeyType

Type returns the key type

type ECDSAPublicKey 

type ECDSAPublicKey struct {
	// contains filtered or unexported fields
}

ECDSAPublicKey is an implementation of an ECDSA public key

func (*ECDSAPublicKey) Bytes 

func (ePub *ECDSAPublicKey) Bytes() ([]byte, error)

Bytes returns the public key as protobuf bytes

func (*ECDSAPublicKey) Equals 

func (ePub *ECDSAPublicKey) Equals(o Key) bool

Equals compares to public keys

func (ECDSAPublicKey) Raw 

func (ePub ECDSAPublicKey) Raw() ([]byte, error)

Raw returns x509 bytes from a public key

func (*ECDSAPublicKey) Type 

func (ePub *ECDSAPublicKey) Type() pb.KeyType

Type returns the key type

func (*ECDSAPublicKey) Verify 

func (ePub *ECDSAPublicKey) Verify(data, sigBytes []byte) (bool, error)

Verify compares data to a signature

type ECDSASig 

type ECDSASig struct {
	R, S *big.Int
}

ECDSASig holds the r and s values of an ECDSA signature

type Ed25519PrivateKey 

type Ed25519PrivateKey struct {
	// contains filtered or unexported fields
}

Ed25519PrivateKey is an ed25519 private key.

func (*Ed25519PrivateKey) Bytes 

func (k *Ed25519PrivateKey) Bytes() ([]byte, error)

Bytes marshals an ed25519 private key to protobuf bytes.

func (*Ed25519PrivateKey) Equals 

func (k *Ed25519PrivateKey) Equals(o Key) bool

Equals compares two ed25519 private keys.

func (*Ed25519PrivateKey) GetPublic 

func (k *Ed25519PrivateKey) GetPublic() PubKey

GetPublic returns an ed25519 public key from a private key.

func (*Ed25519PrivateKey) Raw 

func (k *Ed25519PrivateKey) Raw() ([]byte, error)

Raw private key bytes.

func (*Ed25519PrivateKey) Sign 

func (k *Ed25519PrivateKey) Sign(msg []byte) ([]byte, error)

Sign returns a signature from an input message.

func (*Ed25519PrivateKey) Type 

func (k *Ed25519PrivateKey) Type() pb.KeyType

Type of the private key (Ed25519).

type Ed25519PublicKey 

type Ed25519PublicKey struct {
	// contains filtered or unexported fields
}

Ed25519PublicKey is an ed25519 public key.

func (*Ed25519PublicKey) Bytes 

func (k *Ed25519PublicKey) Bytes() ([]byte, error)

Bytes returns a ed25519 public key as protobuf bytes.

func (*Ed25519PublicKey) Equals 

func (k *Ed25519PublicKey) Equals(o Key) bool

Equals compares two ed25519 public keys.

func (*Ed25519PublicKey) Raw 

func (k *Ed25519PublicKey) Raw() ([]byte, error)

Raw public key bytes.

func (*Ed25519PublicKey) Type 

func (k *Ed25519PublicKey) Type() pb.KeyType

Type of the public key (Ed25519).

func (*Ed25519PublicKey) Verify 

func (k *Ed25519PublicKey) Verify(data []byte, sig []byte) (bool, error)

Verify checks a signature agains the input data.

type GenSharedKey 

type GenSharedKey func([]byte) ([]byte, error)

GenSharedKey generates the shared key from a given private key

func GenerateEKeyPair 

func GenerateEKeyPair(curveName string) ([]byte, GenSharedKey, error)

GenerateEKeyPair returns an ephemeral public key and returns a function that will compute the shared secret key. Used in the identify module.

Focuses only on ECDH now, but can be made more general in the future.

type Key 

type Key interface {
	// Bytes returns a serialized, storeable representation of this key
	// DEPRECATED in favor of Marshal / Unmarshal
	Bytes() ([]byte, error)

	// Equals checks whether two PubKeys are the same
	Equals(Key) bool

	// Raw returns the raw bytes of the key (not wrapped in the
	// libp2p-crypto protobuf).
	//
	// This function is the inverse of {Priv,Pub}KeyUnmarshaler.
	Raw() ([]byte, error)

	// Type returns the protobof key type.
	Type() pb.KeyType
}

Key represents a crypto key that can be compared to another key

type PrivKey 

type PrivKey interface {
	Key

	// Cryptographically sign the given bytes
	Sign([]byte) ([]byte, error)

	// Return a public key paired with this private key
	GetPublic() PubKey
}

PrivKey represents a private key that can be used to generate a public key and sign data

func UnmarshalECDSAPrivateKey 

func UnmarshalECDSAPrivateKey(data []byte) (PrivKey, error)

UnmarshalECDSAPrivateKey returns a private key from x509 bytes

func UnmarshalEd25519PrivateKey 

func UnmarshalEd25519PrivateKey(data []byte) (PrivKey, error)

UnmarshalEd25519PrivateKey returns a private key from input bytes.

func UnmarshalPrivateKey 

func UnmarshalPrivateKey(data []byte) (PrivKey, error)

UnmarshalPrivateKey converts a protobuf serialized private key into its representative object

func UnmarshalRsaPrivateKey 

func UnmarshalRsaPrivateKey(b []byte) (PrivKey, error)

UnmarshalRsaPrivateKey returns a private key from the input x509 bytes

func UnmarshalSecp256k1PrivateKey 

func UnmarshalSecp256k1PrivateKey(data []byte) (PrivKey, error)

UnmarshalSecp256k1PrivateKey returns a private key from bytes

type PrivKeyUnmarshaller 

type PrivKeyUnmarshaller func(data []byte) (PrivKey, error)

PrivKeyUnmarshaller is a func that creates a PrivKey from a given slice of bytes

type PubKey 

type PubKey interface {
	Key

	// Verify that 'sig' is the signed hash of 'data'
	Verify(data []byte, sig []byte) (bool, error)
}

PubKey is a public key that can be used to verifiy data signed with the corresponding private key

func PublicKeyFromProto 

func PublicKeyFromProto(pmes *pb.PublicKey) (PubKey, error)

PublicKeyFromProto converts an unserialized protobuf PublicKey message into its representative object.

func UnmarshalECDSAPublicKey 

func UnmarshalECDSAPublicKey(data []byte) (PubKey, error)

UnmarshalECDSAPublicKey returns the public key from x509 bytes

func UnmarshalEd25519PublicKey 

func UnmarshalEd25519PublicKey(data []byte) (PubKey, error)

UnmarshalEd25519PublicKey returns a public key from input bytes.

func UnmarshalPublicKey 

func UnmarshalPublicKey(data []byte) (PubKey, error)

UnmarshalPublicKey converts a protobuf serialized public key into its representative object

func UnmarshalRsaPublicKey 

func UnmarshalRsaPublicKey(b []byte) (PubKey, error)

UnmarshalRsaPublicKey returns a public key from the input x509 bytes

func UnmarshalSecp256k1PublicKey 

func UnmarshalSecp256k1PublicKey(data []byte) (PubKey, error)

UnmarshalSecp256k1PublicKey returns a public key from bytes

type PubKeyUnmarshaller 

type PubKeyUnmarshaller func(data []byte) (PubKey, error)

PubKeyUnmarshaller is a func that creates a PubKey from a given slice of bytes

type RsaPrivateKey 

type RsaPrivateKey struct {
	// contains filtered or unexported fields
}

RsaPrivateKey is an rsa private key

func (*RsaPrivateKey) Bytes 

func (sk *RsaPrivateKey) Bytes() ([]byte, error)

Bytes returns protobuf bytes from a private key

func (*RsaPrivateKey) Equals 

func (sk *RsaPrivateKey) Equals(k Key) bool

Equals checks whether this key is equal to another

func (*RsaPrivateKey) GetPublic 

func (sk *RsaPrivateKey) GetPublic() PubKey

GetPublic returns a public key

func (*RsaPrivateKey) Raw 

func (sk *RsaPrivateKey) Raw() ([]byte, error)

func (*RsaPrivateKey) Sign 

func (sk *RsaPrivateKey) Sign(message []byte) ([]byte, error)

Sign returns a signature of the input data

func (*RsaPrivateKey) Type 

func (sk *RsaPrivateKey) Type() pb.KeyType

type RsaPublicKey 

type RsaPublicKey struct {
	// contains filtered or unexported fields
}

RsaPublicKey is an rsa public key

func (*RsaPublicKey) Bytes 

func (pk *RsaPublicKey) Bytes() ([]byte, error)

Bytes returns protobuf bytes of a public key

func (*RsaPublicKey) Equals 

func (pk *RsaPublicKey) Equals(k Key) bool

Equals checks whether this key is equal to another

func (*RsaPublicKey) Raw 

func (pk *RsaPublicKey) Raw() ([]byte, error)

func (*RsaPublicKey) Type 

func (pk *RsaPublicKey) Type() pb.KeyType

func (*RsaPublicKey) Verify 

func (pk *RsaPublicKey) Verify(data, sig []byte) (bool, error)

Verify compares a signature against input data

type Secp256k1PrivateKey 

type Secp256k1PrivateKey btcec.PrivateKey

Secp256k1PrivateKey is an Secp256k1 private key

func (*Secp256k1PrivateKey) Bytes 

func (k *Secp256k1PrivateKey) Bytes() ([]byte, error)

Bytes returns protobuf bytes from a private key

func (*Secp256k1PrivateKey) Equals 

func (k *Secp256k1PrivateKey) Equals(o Key) bool

Equals compares two private keys

func (*Secp256k1PrivateKey) GetPublic 

func (k *Secp256k1PrivateKey) GetPublic() PubKey

GetPublic returns a public key

func (*Secp256k1PrivateKey) Raw 

func (k *Secp256k1PrivateKey) Raw() ([]byte, error)

Raw returns the bytes of the key

func (*Secp256k1PrivateKey) Sign 

func (k *Secp256k1PrivateKey) Sign(data []byte) ([]byte, error)

Sign returns a signature from input data

func (*Secp256k1PrivateKey) Type 

func (k *Secp256k1PrivateKey) Type() pb.KeyType

Type returns the private key type

type Secp256k1PublicKey 

type Secp256k1PublicKey btcec.PublicKey

Secp256k1PublicKey is an Secp256k1 public key

func (*Secp256k1PublicKey) Bytes 

func (k *Secp256k1PublicKey) Bytes() ([]byte, error)

Bytes returns protobuf bytes from a public key

func (*Secp256k1PublicKey) Equals 

func (k *Secp256k1PublicKey) Equals(o Key) bool

Equals compares two public keys

func (*Secp256k1PublicKey) Raw 

func (k *Secp256k1PublicKey) Raw() ([]byte, error)

Raw returns the bytes of the key

func (*Secp256k1PublicKey) Type 

func (k *Secp256k1PublicKey) Type() pb.KeyType

Type returns the public key type

func (*Secp256k1PublicKey) Verify 

func (k *Secp256k1PublicKey) Verify(data []byte, sigStr []byte) (bool, error)

Verify compares a signature against the input data

type StretchedKeys 

type StretchedKeys struct {
	IV        []byte
	MacKey    []byte
	CipherKey []byte
}

StretchedKeys ...

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