forked from wavesplatform/gowaves
/
crypto.go
380 lines (324 loc) · 8.75 KB
/
crypto.go
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package crypto
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"crypto/sha512"
"fmt"
"strconv"
"strings"
"github.com/agl/ed25519"
"github.com/agl/ed25519/edwards25519"
"github.com/mr-tron/base58/base58"
"github.com/pkg/errors"
"golang.org/x/crypto/blake2b"
"golang.org/x/crypto/sha3"
)
const (
DigestSize = 32
PublicKeySize = 32
SecretKeySize = 32
SignatureSize = 64
)
type Digest [DigestSize]byte
func (d Digest) String() string {
return base58.Encode(d[:])
}
func (d Digest) MarshalBinary() ([]byte, error) {
b := make([]byte, 0, DigestSize)
copy(b, d[:])
return b, nil
}
func (d *Digest) UnmarshalBinary(data []byte) error {
if l := len(data); l < DigestSize {
return errors.Errorf("failed unmarshal Digest, required %d bytes, got %d", DigestSize, l)
}
copy(d[:], data[:DigestSize])
return nil
}
func (d Digest) MarshalJSON() ([]byte, error) {
return toBase58JSON(d[:]), nil
}
func (d *Digest) UnmarshalJSON(value []byte) error {
b, err := fromBase58JSON(value, DigestSize, "Digest")
if err != nil {
return err
}
copy(d[:], b[:DigestSize])
return nil
}
func NewDigestFromBase58(s string) (Digest, error) {
return array32FromBase58(s, "Digest")
}
type SecretKey [SecretKeySize]byte
func (k SecretKey) MarshalBinary() ([]byte, error) {
b := make([]byte, 0, SecretKeySize)
copy(b, k[:])
return b, nil
}
func (k *SecretKey) UnmarshalBinary(data []byte) error {
if l := len(data); l < SecretKeySize {
return errors.Errorf("failed unmarshal SecretKey, required %d bytes, got %d", SecretKeySize, l)
}
copy(k[:], data[:SecretKeySize])
return nil
}
func (k SecretKey) MarshalJSON() ([]byte, error) {
return toBase58JSON(k[:]), nil
}
func (k *SecretKey) UnmarshalJSON(value []byte) error {
b, err := fromBase58JSON(value, SecretKeySize, "SecretKey")
if err != nil {
return err
}
copy(k[:], b[:SecretKeySize])
return nil
}
func (k SecretKey) String() string {
return base58.Encode(k[:])
}
func NewSecretKeyFromBase58(s string) (SecretKey, error) {
return array32FromBase58(s, "SecretKey")
}
type PublicKey [PublicKeySize]byte
func (k PublicKey) MarshalBinary() ([]byte, error) {
b := make([]byte, 0, PublicKeySize)
copy(b, k[:])
return b, nil
}
func (k *PublicKey) UnmarshalBinary(data []byte) error {
if l := len(data); l < PublicKeySize {
return errors.Errorf("failed unmarshal PublicKey, required %d bytes, got %d", PublicKeySize, l)
}
copy(k[:], data[:PublicKeySize])
return nil
}
func (k PublicKey) MarshalJSON() ([]byte, error) {
return toBase58JSON(k[:]), nil
}
func (k *PublicKey) UnmarshalJSON(value []byte) error {
b, err := fromBase58JSON(value, PublicKeySize, "PublicKey")
if err != nil {
return err
}
copy(k[:], b[:PublicKeySize])
return nil
}
func NewPublicKeyFromBase58(s string) (PublicKey, error) {
return array32FromBase58(s, "PublicKey")
}
type Signature [SignatureSize]byte
func (s Signature) String() string {
return base58.Encode(s[:])
}
func (s Signature) MarshalBinary() ([]byte, error) {
b := make([]byte, 0, SignatureSize)
copy(b, s[:])
return b, nil
}
func (s *Signature) UnmarshalBinary(data []byte) error {
if l := len(data); l < SignatureSize {
return errors.Errorf("failed unmarshal Signature, required %d bytes, got %d", SignatureSize, l)
}
copy(s[:], data[:SignatureSize])
return nil
}
func (s Signature) MarshalJSON() ([]byte, error) {
return toBase58JSON(s[:]), nil
}
func (s *Signature) UnmarshalJSON(value []byte) error {
b, err := fromBase58JSON(value, SignatureSize, "Signature")
if err != nil {
return err
}
copy(s[:], b[:SignatureSize])
return nil
}
func NewSignatureFromBase58(s string) (Signature, error) {
return array64FromBase58(s, "Signature")
}
func Keccak256(data []byte) Digest {
var d Digest
h := sha3.NewLegacyKeccak256()
h.Write(data)
h.Sum(d[:0])
return d
}
func FastHash(data []byte) (Digest, error) {
var d Digest
h, err := blake2b.New256(nil)
if err != nil {
return d, err
}
h.Write(data)
h.Sum(d[:0])
return d, nil
}
func SecureHash(data []byte) (Digest, error) {
var d Digest
fh, err := blake2b.New256(nil)
if err != nil {
return d, err
}
fh.Write(data)
fh.Sum(d[:0])
h := sha3.NewLegacyKeccak256()
h.Write(d[:DigestSize])
h.Sum(d[:0])
return d, nil
}
func GenerateSecretKey(seed []byte) SecretKey {
var sk SecretKey
copy(sk[:], seed[:SecretKeySize])
sk[0] &= 248
sk[31] &= 127
sk[31] |= 64
return sk
}
func GeneratePublicKey(sk SecretKey) PublicKey {
var pk PublicKey
s := [SecretKeySize]byte(sk)
var ed edwards25519.ExtendedGroupElement
edwards25519.GeScalarMultBase(&ed, &s)
var edYPlusOne = new(edwards25519.FieldElement)
edwards25519.FeAdd(edYPlusOne, &ed.Y, &ed.Z)
var oneMinusEdY = new(edwards25519.FieldElement)
edwards25519.FeSub(oneMinusEdY, &ed.Z, &ed.Y)
var invOneMinusEdY = new(edwards25519.FieldElement)
edwards25519.FeInvert(invOneMinusEdY, oneMinusEdY)
var montX = new(edwards25519.FieldElement)
edwards25519.FeMul(montX, edYPlusOne, invOneMinusEdY)
p := new([PublicKeySize]byte)
edwards25519.FeToBytes(p, montX)
copy(pk[:], p[:])
return pk
}
func GenerateKeyPair(seed []byte) (SecretKey, PublicKey) {
h := sha256.New()
h.Write(seed)
digest := h.Sum(nil)
var sk SecretKey
var pk PublicKey
sk = GenerateSecretKey(digest)
pk = GeneratePublicKey(sk)
return sk, pk
}
func Sign(secretKey SecretKey, data []byte) Signature {
var sig Signature
var edPubKeyPoint edwards25519.ExtendedGroupElement
sk := [SecretKeySize]byte(secretKey)
edwards25519.GeScalarMultBase(&edPubKeyPoint, &sk)
var edPubKey = new([PublicKeySize]byte)
edPubKeyPoint.ToBytes(edPubKey)
signBit := edPubKey[31] & 0x80
s := sign(&sk, edPubKey, data)
s[63] &= 0x7f
s[63] |= signBit
copy(sig[:], s[:SignatureSize])
return sig
}
func sign(curvePrivateKey, edPublicKey *[DigestSize]byte, data []byte) [SignatureSize]byte {
var prefix = bytes.Repeat([]byte{0xff}, 32)
prefix[0] = 0xfe
random := make([]byte, 64)
rand.Read(random)
var messageDigest, hramDigest [64]byte
h := sha512.New()
h.Write(prefix)
h.Write(curvePrivateKey[:])
h.Write(data)
h.Write(random)
h.Sum(messageDigest[:0])
var messageDigestReduced [32]byte
edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
var R edwards25519.ExtendedGroupElement
edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
var encodedR [32]byte
R.ToBytes(&encodedR)
h.Reset()
h.Write(encodedR[:])
h.Write(edPublicKey[:])
h.Write(data)
h.Sum(hramDigest[:0])
var hramDigestReduced [32]byte
edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
var s [32]byte
edwards25519.ScMulAdd(&s, &hramDigestReduced, curvePrivateKey, &messageDigestReduced)
var signature [64]byte
copy(signature[:], encodedR[:])
copy(signature[32:], s[:])
return signature
}
func Verify(publicKey PublicKey, signature Signature, data []byte) bool {
pk := [DigestSize]byte(publicKey)
var montX = new(edwards25519.FieldElement)
edwards25519.FeFromBytes(montX, &pk)
var one = new(edwards25519.FieldElement)
edwards25519.FeOne(one)
var montXMinusOne = new(edwards25519.FieldElement)
edwards25519.FeSub(montXMinusOne, montX, one)
var montXPlusOne = new(edwards25519.FieldElement)
edwards25519.FeAdd(montXPlusOne, montX, one)
var invMontXPlusOne = new(edwards25519.FieldElement)
edwards25519.FeInvert(invMontXPlusOne, montXPlusOne)
var edY = new(edwards25519.FieldElement)
edwards25519.FeMul(edY, montXMinusOne, invMontXPlusOne)
var edPubKey = new([PublicKeySize]byte)
edwards25519.FeToBytes(edPubKey, edY)
edPubKey[31] &= 0x7F
edPubKey[31] |= signature[63] & 0x80
s := new([SignatureSize]byte)
copy(s[:], signature[:])
s[63] &= 0x7f
return ed25519.Verify(edPubKey, data, s)
}
func toBase58JSON(b []byte) []byte {
s := base58.Encode(b)
var sb strings.Builder
sb.WriteRune('"')
sb.WriteString(s)
sb.WriteRune('"')
return []byte(sb.String())
}
func fromBase58JSON(value []byte, size int, name string) ([]byte, error) {
s := string(value)
if s == "null" {
return nil, nil
}
s, err := strconv.Unquote(s)
if err != nil {
return nil, errors.Wrapf(err, "failed to unmarshal %s from JSON", name)
}
v, err := base58.Decode(s)
if err != nil {
return nil, errors.Wrapf(err, "failed to decode %s from Base58 string", name)
}
if l := len(v); l != size {
return nil, errors.Errorf("incorrect length %d of %s value, expected %d", l, name, DigestSize)
}
return v[:size], nil
}
func array32FromBase58(s, name string) ([32]byte, error) {
var r [32]byte
b, err := base58.Decode(s)
if err != nil {
return r, err
}
if l := len(b); l != 32 {
return r, fmt.Errorf("incorrect %s lenght %d, expected %d", name, l, 32)
}
copy(r[:], b[:32])
return r, nil
}
func array64FromBase58(s, name string) ([64]byte, error) {
var r [64]byte
b, err := base58.Decode(s)
if err != nil {
return r, err
}
if l := len(b); l != 64 {
return r, fmt.Errorf("incorrect %s lenght %d, expected %d", name, l, 64)
}
copy(r[:], b[:64])
return r, nil
}