crypto

package
v0.3.2 Latest Latest
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Published: May 26, 2015 License: MIT Imports: 11 Imported by: 0

Documentation

Index

Constants

View Source
const (
	PublicKeySize = ed25519.PublicKeySize
	SecretKeySize = ed25519.PrivateKeySize
	SignatureSize = ed25519.SignatureSize
)
View Source
const (
	HashSize = 32
)
View Source
const (
	SegmentSize = 64 // number of bytes that are hashed to form each base leaf of the Merkle tree
)

Variables

View Source
var (
	ErrNilInput         = errors.New("cannot use nil input")
	ErrInvalidSignature = errors.New("invalid signature")
)
View Source
var (
	ErrInsufficientLen = errors.New("supplied ciphertext is not long enough to contain a nonce")
)

Functions

func CalculateSegments added in v0.3.0

func CalculateSegments(fileSize uint64) (numSegments uint64)

Calculates the number of segments in the file when building a Merkle tree. Should probably be renamed to CountLeaves() or something.

func GenerateSignatureKeys

func GenerateSignatureKeys() (sk SecretKey, pk PublicKey, err error)

GenerateKeyPair creates a public-secret keypair that can be used to sign and verify messages.

func NewHash added in v0.3.0

func NewHash() hash.Hash

func NewTree added in v0.3.0

func NewTree() tree

func VerifyHash added in v0.3.0

func VerifyHash(data Hash, pk PublicKey, sig Signature) (err error)

VerifyHash uses a public key and input data to verify a signature.

func VerifySegment added in v0.3.0

func VerifySegment(base [SegmentSize]byte, hashSet []Hash, numSegments, proofIndex uint64, root Hash) bool

Types

type Ciphertext added in v0.3.1

type Ciphertext []byte

type Hash added in v0.3.0

type Hash [HashSize]byte

func BuildReaderProof added in v0.3.0

func BuildReaderProof(r io.Reader, proofIndex uint64) (base [SegmentSize]byte, hashSet []Hash, err error)

func HashAll added in v0.3.0

func HashAll(objs ...interface{}) Hash

HashAll takes a set of objects as input, encodes them all using the encoding package, and then hashes the result.

func HashBytes added in v0.3.0

func HashBytes(data []byte) Hash

HashBytes takes a byte slice and returns the result.

func HashObject added in v0.3.0

func HashObject(obj interface{}) Hash

HashObject takes an object as input, encodes it using the encoding package, and then hashes the result.

func MerkleRoot added in v0.3.0

func MerkleRoot(leaves [][]byte) (h Hash)

MerkleRoot calculates the "root hash" formed by repeatedly concatenating and hashing a binary tree of hashes. If the number of leaves is not a power of 2, the orphan hash(es) are not rehashed. Examples:

     ┌───┴──┐       ┌────┴───┐         ┌─────┴─────┐
  ┌──┴──┐   │    ┌──┴──┐     │      ┌──┴──┐     ┌──┴──┐
┌─┴─┐ ┌─┴─┐ │  ┌─┴─┐ ┌─┴─┐ ┌─┴─┐  ┌─┴─┐ ┌─┴─┐ ┌─┴─┐   │
   (5-leaf)         (6-leaf)             (7-leaf)

func ReaderMerkleRoot added in v0.3.0

func ReaderMerkleRoot(r io.Reader) (h Hash, err error)

type HashSlice added in v0.3.0

type HashSlice []Hash

HashSlice is used for sorting

func (HashSlice) Len added in v0.3.0

func (hs HashSlice) Len() int

These functions implement sort.Interface, allowing hashes to be sorted.

func (HashSlice) Less added in v0.3.0

func (hs HashSlice) Less(i, j int) bool

func (HashSlice) Swap added in v0.3.0

func (hs HashSlice) Swap(i, j int)

type PublicKey

type PublicKey [ed25519.PublicKeySize]byte

type SecretKey

type SecretKey [ed25519.PrivateKeySize]byte

type Signature

type Signature [ed25519.SignatureSize]byte

func SignHash added in v0.3.0

func SignHash(data Hash, sk SecretKey) (sig Signature, err error)

SignHash signs a message using a secret key.

type TwofishKey added in v0.3.0

type TwofishKey [32]byte

func GenerateTwofishKey added in v0.3.0

func GenerateTwofishKey() (key TwofishKey, err error)

GenerateEncryptionKey produces a key that can be used for encrypting and decrypting files.

func (TwofishKey) DecryptBytes added in v0.3.0

func (key TwofishKey) DecryptBytes(ct Ciphertext) ([]byte, error)

DecryptBytes decrypts the ciphertext created by EncryptBytes. The nonce is expected to be the first 12 bytes of the ciphertext.

func (TwofishKey) EncryptBytes added in v0.3.0

func (key TwofishKey) EncryptBytes(plaintext []byte) (Ciphertext, error)

EncryptBytes encrypts a []byte using the key. EncryptBytes uses GCM and prepends the nonce (12 bytes) to the ciphertext.

func (TwofishKey) NewCipher added in v0.3.2

func (key TwofishKey) NewCipher() cipher.Block

NewCipher creates a new Twofish cipher from the key.

func (TwofishKey) NewReader added in v0.3.2

func (key TwofishKey) NewReader(r io.Reader) io.Reader

NewReader returns a reader that encrypts or decrypts its input stream.

func (TwofishKey) NewWriter added in v0.3.2

func (key TwofishKey) NewWriter(w io.Writer) io.Writer

NewWriter returns a writer that encrypts or decrypts its input stream.

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