add travis, add go.mod go.sum, update babyjub hex encoders to avoid

importing go-iden3

.travis.yml

@@ -0,0 +1,8 @@
+dist: xenial
+language: go
+
+go:
+  - "1.12"
+
+env:
+  - GO111MODULE=on

README.md

@@ -1,3 +1,3 @@
-# go-iden3-crypto [![Go Report Card](https://goreportcard.com/badge/github.com/iden3/go-iden3-crypto)](https://goreportcard.com/report/github.com/iden3/go-iden3-crypto) [![GoDoc](https://godoc.org/github.com/iden3/go-iden3-crypto?status.svg)](https://godoc.org/github.com/iden3/go-iden3-crypto)
+# go-iden3-crypto [![Go Report Card](https://goreportcard.com/badge/github.com/iden3/go-iden3-crypto)](https://goreportcard.com/report/github.com/iden3/go-iden3-crypto) [![Build Status](https://travis-ci.org/iden3/go-iden3-crypto.svg?branch=master)](https://travis-ci.org/iden3/go-iden3-crypto) [![GoDoc](https://godoc.org/github.com/iden3/go-iden3-crypto?status.svg)](https://godoc.org/github.com/iden3/go-iden3-crypto)
 Go implementation of some cryptographic primitives used in iden3
 

babyjub/babyjub_test.go

@@ -1,11 +1,11 @@
 package babyjub
 
 import (
-	// "fmt"
 	"encoding/hex"
-	"github.com/stretchr/testify/assert"
 	"math/big"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestAdd1(t *testing.T) {

babyjub/eddsa.go

@@ -2,11 +2,9 @@ package babyjub
 
 import (
 	"crypto/rand"
-	// "encoding/hex"
+
-	// "fmt"
+	"github.com/iden3/go-iden3-crypto/mimc7"
-	common3 "github.com/iden3/go-iden3/common"
+
-	"github.com/iden3/go-iden3/crypto/mimc7"
-	// "golang.org/x/crypto/blake2b"
 	"math/big"
 )
 
@@ -78,17 +76,17 @@ type PublicKey Point
 
 func (pk PublicKey) MarshalText() ([]byte, error) {
 	pkc := pk.Compress()
-	return common3.Hex(pkc[:]).MarshalText()
+	return Hex(pkc[:]).MarshalText()
 }
 
 func (pk PublicKey) String() string {
 	pkc := pk.Compress()
-	return common3.Hex(pkc[:]).String()
+	return Hex(pkc[:]).String()
 }
 
 func (pk *PublicKey) UnmarshalText(h []byte) error {
 	var pkc PublicKeyComp
-	if err := common3.HexDecodeInto(pkc[:], h); err != nil {
+	if err := HexDecodeInto(pkc[:], h); err != nil {
 		return err
 	}
 	pkd, err := pkc.Decompress()
@@ -108,9 +106,9 @@ func (p *PublicKey) Point() *Point {
 // point.
 type PublicKeyComp [32]byte
 
-func (buf PublicKeyComp) MarshalText() ([]byte, error)  { return common3.Hex(buf[:]).MarshalText() }
+func (buf PublicKeyComp) MarshalText() ([]byte, error)  { return Hex(buf[:]).MarshalText() }
-func (buf PublicKeyComp) String() string                { return common3.Hex(buf[:]).String() }
+func (buf PublicKeyComp) String() string                { return Hex(buf[:]).String() }
-func (buf *PublicKeyComp) UnmarshalText(h []byte) error { return common3.HexDecodeInto(buf[:], h) }
+func (buf *PublicKeyComp) UnmarshalText(h []byte) error { return HexDecodeInto(buf[:], h) }
 
 func (p *PublicKey) Compress() PublicKeyComp {
 	return PublicKeyComp((*Point)(p).Compress())
@@ -134,9 +132,9 @@ type Signature struct {
 // SignatureComp represents a compressed EdDSA signature.
 type SignatureComp [64]byte
 
-func (buf SignatureComp) MarshalText() ([]byte, error)  { return common3.Hex(buf[:]).MarshalText() }
+func (buf SignatureComp) MarshalText() ([]byte, error)  { return Hex(buf[:]).MarshalText() }
-func (buf SignatureComp) String() string                { return common3.Hex(buf[:]).String() }
+func (buf SignatureComp) String() string                { return Hex(buf[:]).String() }
-func (buf *SignatureComp) UnmarshalText(h []byte) error { return common3.HexDecodeInto(buf[:], h) }
+func (buf *SignatureComp) UnmarshalText(h []byte) error { return HexDecodeInto(buf[:], h) }
 
 // Compress an EdDSA signature by concatenating the compression of
 // the point R8 and the Little-Endian encoding of S.

babyjub/eddsa_test.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
-	// "golang.org/x/crypto/blake2b"
 	"math/big"
 	"testing"
 )

babyjub/helpers.go

@@ -1,8 +1,13 @@
 package babyjub
 
 import (
-	"github.com/dchest/blake512" // I have personally reviewed that this module doesn't do anything suspicious
+	"bytes"
+	"encoding/hex"
+	"fmt"
 	"math/big"
+	"strings"
+
+	"github.com/dchest/blake512" // I have personally reviewed that this module doesn't do anything suspicious
 )
 
 // SwapEndianness swaps the endianness of the value encoded in xs.  If xs is
@@ -37,3 +42,47 @@ func Blake512(m []byte) []byte {
 	h.Write(m[:])
 	return h.Sum(nil)
 }
+
+// Hex is a byte slice type that can be marshalled and unmarshaled in hex
+type Hex []byte
+
+// MarshalText encodes buf as hex
+func (buf Hex) MarshalText() ([]byte, error) {
+	return []byte(hex.EncodeToString(buf)), nil
+}
+
+// String encodes buf as hex
+func (buf Hex) String() string {
+	return hex.EncodeToString(buf)
+}
+
+// HexEncode encodes an array of bytes into a string in hex.
+func HexEncode(bs []byte) string {
+	return fmt.Sprintf("0x%s", hex.EncodeToString(bs))
+}
+
+// HexDecode decodes a hex string into an array of bytes.
+func HexDecode(h string) ([]byte, error) {
+	if strings.HasPrefix(h, "0x") {
+		h = h[2:]
+	}
+	return hex.DecodeString(h)
+}
+
+// HexDecodeInto decodes a hex string into an array of bytes (dst), verifying
+// that the decoded array has the same length as dst.
+func HexDecodeInto(dst []byte, h []byte) error {
+	if bytes.HasPrefix(h, []byte("0x")) {
+		h = h[2:]
+	}
+	if len(h)/2 != len(dst) {
+		return fmt.Errorf("expected %v bytes in hex string, got %v", len(dst), len(h)/2)
+	}
+	n, err := hex.Decode(dst, h)
+	if err != nil {
+		return err
+	} else if n != len(dst) {
+		return fmt.Errorf("expected %v bytes when decoding hex string, got %v", len(dst), n)
+	}
+	return nil
+}

go.mod

@@ -0,0 +1,10 @@
+module github.com/iden3/go-iden3-crypto
+
+go 1.12
+
+require (
+	github.com/dchest/blake512 v1.0.0
+	github.com/ethereum/go-ethereum v1.8.27
+	github.com/stretchr/testify v1.3.0
+	golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4 // indirect
+)

go.sum

@@ -0,0 +1,18 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dchest/blake512 v1.0.0 h1:oDFEQFIqFSeuA34xLtXZ/rWxCXdSjirjzPhey5EUvmA=
+github.com/dchest/blake512 v1.0.0/go.mod h1:FV1x7xPPLWukZlpDpWQ88rF/SFwZ5qbskrzhLMB92JI=
+github.com/ethereum/go-ethereum v1.8.27 h1:d+gkiLaBDk5fn3Pe/xNVaMrB/ozI+AUB2IlVBp29IrY=
+github.com/ethereum/go-ethereum v1.8.27/go.mod h1:PwpWDrCLZrV+tfrhqqF6kPknbISMHaJv9Ln3kPCZLwY=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4 h1:ydJNl0ENAG67pFbB+9tfhiL2pYqLhfoaZFw/cjLhY4A=
+golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

mimc7/mimc7.go

@@ -6,7 +6,7 @@ import (
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/iden3/go-iden3/crypto/field"
+	"github.com/iden3/go-iden3-crypto/field"
 )
 
 const SEED = "mimc"

mimc7/mimc7_test.go

@@ -5,7 +5,7 @@ import (
 	"math/big"
 	"testing"
 
-	"github.com/iden3/go-iden3/crypto/field"
+	"github.com/iden3/go-iden3-crypto/field"
 	"github.com/stretchr/testify/assert"
 )