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Move constants and utils to package, apply small fixes

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This commit is contained in:
Eduard S
2019-07-01 12:51:34 +02:00
parent 09c29da99e
commit 5b79ded540
10 changed files with 244 additions and 228 deletions
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29
babyjub/eddsa.go
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@@ -4,6 +4,7 @@ import (
"crypto/rand"
"github.com/iden3/go-iden3-crypto/mimc7"
"github.com/iden3/go-iden3-crypto/utils"
"math/big"
)
@@ -39,7 +40,7 @@ func (k *PrivateKey) Scalar() *PrivKeyScalar {
copy(sBuf32[:], sBuf[:32])
pruneBuffer(&sBuf32)
s := new(big.Int)
SetBigIntFromLEBytes(s, sBuf32[:])
utils.SetBigIntFromLEBytes(s, sBuf32[:])
s.Rsh(s, 3)
return NewPrivKeyScalar(s)
}
@@ -76,17 +77,17 @@ type PublicKey Point
func (pk PublicKey) MarshalText() ([]byte, error) {
pkc := pk.Compress()
return Hex(pkc[:]).MarshalText()
return utils.Hex(pkc[:]).MarshalText()
}
func (pk PublicKey) String() string {
pkc := pk.Compress()
return Hex(pkc[:]).String()
return utils.Hex(pkc[:]).String()
}
func (pk *PublicKey) UnmarshalText(h []byte) error {
var pkc PublicKeyComp
if err := HexDecodeInto(pkc[:], h); err != nil {
if err := utils.HexDecodeInto(pkc[:], h); err != nil {
return err
}
pkd, err := pkc.Decompress()
@@ -106,9 +107,9 @@ func (p *PublicKey) Point() *Point {
// point.
type PublicKeyComp [32]byte
func (buf PublicKeyComp) MarshalText() ([]byte, error) { return Hex(buf[:]).MarshalText() }
func (buf PublicKeyComp) String() string { return Hex(buf[:]).String() }
func (buf *PublicKeyComp) UnmarshalText(h []byte) error { return HexDecodeInto(buf[:], h) }
func (buf PublicKeyComp) MarshalText() ([]byte, error) { return utils.Hex(buf[:]).MarshalText() }
func (buf PublicKeyComp) String() string { return utils.Hex(buf[:]).String() }
func (buf *PublicKeyComp) UnmarshalText(h []byte) error { return utils.HexDecodeInto(buf[:], h) }
func (p *PublicKey) Compress() PublicKeyComp {
return PublicKeyComp((*Point)(p).Compress())
@@ -132,15 +133,15 @@ type Signature struct {
// SignatureComp represents a compressed EdDSA signature.
type SignatureComp [64]byte
func (buf SignatureComp) MarshalText() ([]byte, error) { return Hex(buf[:]).MarshalText() }
func (buf SignatureComp) String() string { return Hex(buf[:]).String() }
func (buf *SignatureComp) UnmarshalText(h []byte) error { return HexDecodeInto(buf[:], h) }
func (buf SignatureComp) MarshalText() ([]byte, error) { return utils.Hex(buf[:]).MarshalText() }
func (buf SignatureComp) String() string { return utils.Hex(buf[:]).String() }
func (buf *SignatureComp) UnmarshalText(h []byte) error { return utils.HexDecodeInto(buf[:], h) }
// Compress an EdDSA signature by concatenating the compression of
// the point R8 and the Little-Endian encoding of S.
func (s *Signature) Compress() SignatureComp {
R8p := s.R8.Compress()
Sp := BigIntLEBytes(s.S)
Sp := utils.BigIntLEBytes(s.S)
buf := [64]byte{}
copy(buf[:32], R8p[:])
copy(buf[32:], Sp[:])
@@ -156,7 +157,7 @@ func (s *Signature) Decompress(buf [64]byte) (*Signature, error) {
if s.R8, err = NewPoint().Decompress(R8p); err != nil {
return nil, err
}
s.S = SetBigIntFromLEBytes(new(big.Int), buf[32:])
s.S = utils.SetBigIntFromLEBytes(new(big.Int), buf[32:])
return s, nil
}
@@ -170,11 +171,11 @@ func (s *SignatureComp) Decompress() (*Signature, error) {
// for buffer hashing and mimc7 for big.Int hashing.
func (k *PrivateKey) SignMimc7(msg *big.Int) *Signature {
h1 := Blake512(k[:])
msgBuf := BigIntLEBytes(msg)
msgBuf := utils.BigIntLEBytes(msg)
msgBuf32 := [32]byte{}
copy(msgBuf32[:], msgBuf[:])
rBuf := Blake512(append(h1[32:], msgBuf32[:]...))
r := SetBigIntFromLEBytes(new(big.Int), rBuf) // r = H(H_{32..63}(k), msg)
r := utils.SetBigIntFromLEBytes(new(big.Int), rBuf) // r = H(H_{32..63}(k), msg)
r.Mod(r, SubOrder)
R8 := NewPoint().Mul(r, B8) // R8 = r * 8 * B
A := k.Public().Point()