cryptoutil

Documentation

Index

• Constants
• Variables
• func Derive25519KEK(alg, apu []byte, fromPrivKey, toPubKey *[chacha.KeySize]byte) ([]byte, error)
• func IsChachaKeyValid(key []byte) bool
• func IsEncKeyPairValid(kp *EncKeyPair) bool
• func IsMessagingKeysValid(kpb *MessagingKeys) bool
• func IsSigKeyPairValid(kp *SigKeyPair) bool
• func Nonce(pub1, pub2 []byte) (*[NonceSize]byte, error)
• func PublicEd25519toCurve25519(pub []byte) ([]byte, error)
• func SecretEd25519toCurve25519(priv []byte) ([]byte, error)
• func VerifyKeys(sender KeyPair, recipients [][]byte) error
• type EncKeyPair
• type EncryptionAlgorithm
• type KeyPair
• type MessagingKeys
• type SigKeyPair
• type SignatureAlgorithm

Constants

const (

	// Curve25519 encryption key type
	Curve25519 = EncryptionAlgorithm("Curve25519")

	// EdDSA signature key type
	EdDSA = SignatureAlgorithm("EdDSA")
)

const Curve25519KeySize = 32

Curve25519KeySize number of bytes in a Curve25519 public or private key

const NonceSize = 24

NonceSize size of a nonce used by Box encryption (Xchacha20Poly1305)

Variables

var ErrInvalidKey = errors.New("invalid key")

ErrInvalidKey is used when a key is invalid

var ErrKeyNotFound = errors.New("key not found")

ErrKeyNotFound is returned when key not found

Functions

func Derive25519KEK

func Derive25519KEK(alg, apu []byte, fromPrivKey, toPubKey *[chacha.KeySize]byte) ([]byte, error)

Derive25519KEK is a utility function that will derive an ephemeral symmetric key (kek) using fromPrivKey and toPubKey

func IsChachaKeyValid

func IsChachaKeyValid(key []byte) bool

IsChachaKeyValid will return true if key size is the same as chacha20poly1305.keySize false otherwise

func IsEncKeyPairValid

func IsEncKeyPairValid(kp *EncKeyPair) bool

IsEncKeyPairValid is a utility function that validates an EncKeyPair

func IsMessagingKeysValid

func IsMessagingKeysValid(kpb *MessagingKeys) bool

IsMessagingKeysValid is a utility function that validates a KeyPair

func IsSigKeyPairValid

func IsSigKeyPairValid(kp *SigKeyPair) bool

IsSigKeyPairValid is a utility function that validates an EncKeyPair

func Nonce

func Nonce(pub1, pub2 []byte) (*[NonceSize]byte, error)

Nonce makes a nonce using blake2b, to match the format expected by libsodium

func PublicEd25519toCurve25519

func PublicEd25519toCurve25519(pub []byte) ([]byte, error)

PublicEd25519toCurve25519 takes an Ed25519 public key and provides the corresponding Curve25519 public key

This function wraps PublicKeyToCurve25519 from Adam Langley's ed25519 repo: https://github.com/agl/ed25519

func SecretEd25519toCurve25519

func SecretEd25519toCurve25519(priv []byte) ([]byte, error)

SecretEd25519toCurve25519 converts a secret key from Ed25519 to curve25519 format

This function wraps PrivateKeyToCurve25519 from Adam Langley's ed25519 repo: https://github.com/agl/ed25519

func VerifyKeys

func VerifyKeys(sender KeyPair, recipients [][]byte) error

VerifyKeys is a utility function that verifies if sender key pair and recipients keys are valid (not empty)

Types

type EncKeyPair

type EncKeyPair struct {
	KeyPair `json:"keypair,omitempty"`
	// Alg is the encryption algorithm of keys enclosed in this key pair
	Alg EncryptionAlgorithm `json:"alg,omitempty"`
}

EncKeyPair represents a private/public encryption key pair

type EncryptionAlgorithm

type EncryptionAlgorithm string

EncryptionAlgorithm represents a content encryption algorithm.

type KeyPair

type KeyPair struct {
	// Priv is a private key
	Priv []byte `json:"priv,omitempty"`
	// Pub is a public key
	Pub []byte `json:"pub,omitempty"`
}

KeyPair represents a private/public key pair

type MessagingKeys

type MessagingKeys struct {
	*EncKeyPair `json:"enckeypair,omitempty"`
	*SigKeyPair `json:"sigkeypair,omitempty"`
}

MessagingKeys represents a pair of key pairs, one for encryption and one for signature usually stored in a LegacyKMS, it helps prevent converting signing keys into encryption ones TODO refactor this structure and all KeyPair handling as per issue #596

type SigKeyPair

type SigKeyPair struct {
	KeyPair `json:"keypair,omitempty"`
	// Alg is the signature algorithm of keys enclosed in this key pair
	Alg SignatureAlgorithm `json:"alg,omitempty"`
}

SigKeyPair represents a private/public signature (verification) key pair

type SignatureAlgorithm

type SignatureAlgorithm string

SignatureAlgorithm represents a signature algorithm.