Update Circom proofs for compatibility,add parsers

Update Circom proofs for compatibility,add parsers.

CircomProcessorProof & CircomVerifierProof have been tested to be
compatible into a circom circuit at versions:
```
"circom": "0.5.27",
"circomlib": "0.2.4"
```

go.sum

@@ -86,6 +86,7 @@ github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5Kwzbycv
 github.com/fjl/memsize v0.0.0-20180418122429-ca190fb6ffbc/go.mod h1:VvhXpOYNQvB+uIk2RvXzuaQtkQJzzIx6lSBe1xv7hi0=
 github.com/fjl/memsize v0.0.0-20190710130421-bcb5799ab5e5/go.mod h1:VvhXpOYNQvB+uIk2RvXzuaQtkQJzzIx6lSBe1xv7hi0=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
+github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/gballet/go-libpcsclite v0.0.0-20190607065134-2772fd86a8ff/go.mod h1:x7DCsMOv1taUwEWCzT4cmDeAkigA5/QCwUodaVOe8Ww=
 github.com/getsentry/raven-go v0.2.0 h1:no+xWJRb5ZI7eE8TWgIq1jLulQiIoLG0IfYxv5JYMGs=
@@ -109,6 +110,7 @@ github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls=
 github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2-0.20190517061210-b285ee9cfc6c h1:zqAKixg3cTcIasAMJV+EcfVbWwLpOZ7LeoWJvcuD/5Q=
 github.com/golang/protobuf v1.3.2-0.20190517061210-b285ee9cfc6c/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v0.0.2-0.20190904063534-ff6b7dc882cf h1:gFVkHXmVAhEbxZVDln5V9GKrLaluNoFHDbrZwAWZgws=
@@ -122,6 +124,7 @@ github.com/graph-gophers/graphql-go v0.0.0-20191115155744-f33e81362277/go.mod h1
 github.com/hashicorp/golang-lru v0.0.0-20160813221303-0a025b7e63ad/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.3/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
 github.com/howeyc/fsnotify v0.9.0/go.mod h1:41HzSPxBGeFRQKEEwgh49TRw/nKBsYZ2cF1OzPjSJsA=
+github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/huin/goupnp v0.0.0-20161224104101-679507af18f3/go.mod h1:MZ2ZmwcBpvOoJ22IJsc7va19ZwoheaBk43rKg12SKag=
 github.com/huin/goupnp v1.0.0/go.mod h1:n9v9KO1tAxYH82qOn+UTIFQDmx5n1Zxd/ClZDMX7Bnc=
@@ -132,10 +135,6 @@ github.com/iden3/go-circom-witnesscalc v0.0.1/go.mod h1:xjT1BlFZDBioHOlbD75SmZZL
 github.com/iden3/go-iden3-core v0.0.8 h1:PLw7iCiX7Pw1dqBkR+JaLQWqB5RKd+vgu25UBdvFXGQ=
 github.com/iden3/go-iden3-core v0.0.8/go.mod h1:URNjIhMql6sEbWubIGrjJdw5wHCE1Pk1XghxjBOtA3s=
 github.com/iden3/go-iden3-crypto v0.0.5/go.mod h1:XKw1oDwYn2CIxKOtr7m/mL5jMn4mLOxAxtZBRxQBev8=
-github.com/iden3/go-iden3-crypto v0.0.6-0.20200723082457-29a66457f0bf h1:/7L5dEqctuzJY2g8OEQct+1Y+n2sMKyd4JoYhw2jy1s=
-github.com/iden3/go-iden3-crypto v0.0.6-0.20200723082457-29a66457f0bf/go.mod h1:XKw1oDwYn2CIxKOtr7m/mL5jMn4mLOxAxtZBRxQBev8=
-github.com/iden3/go-iden3-crypto v0.0.6-0.20200818162919-3364756c2ca6 h1:8B0nnJejnuZZYmbg1MkyrbeQWGkhHTXOyTEU+htfpR8=
-github.com/iden3/go-iden3-crypto v0.0.6-0.20200818162919-3364756c2ca6/go.mod h1:oBgthFLboAWi9feaBUFy7OxEcyn9vA1khHSL/WwWFyg=
 github.com/iden3/go-iden3-crypto v0.0.6-0.20200819064831-09d161e9f670 h1:gNBFu/WnRfNn+xywE04fgCWSHlb6wr0nIIll9i4R2fc=
 github.com/iden3/go-iden3-crypto v0.0.6-0.20200819064831-09d161e9f670/go.mod h1:oBgthFLboAWi9feaBUFy7OxEcyn9vA1khHSL/WwWFyg=
 github.com/iden3/go-wasm3 v0.0.1/go.mod h1:j+TcAB94Dfrjlu5kJt83h2OqAU+oyNUTwNZnQyII1sI=
@@ -158,11 +157,14 @@ github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd/go.mod h1:CT
 github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/pty v1.1.8/go.mod h1:O1sed60cT9XZ5uDucP5qwvh+TE3NnUj51EiZO/lmSfw=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/leodido/go-urn v1.1.0/go.mod h1:+cyI34gQWZcE1eQU7NVgKkkzdXDQHr1dBMtdAPozLkw=
@@ -189,7 +191,9 @@ github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn
 github.com/olekukonko/tablewriter v0.0.1/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
 github.com/olekukonko/tablewriter v0.0.2-0.20190409134802-7e037d187b0c/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
 github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
 github.com/oschwald/maxminddb-golang v1.4.0/go.mod h1:3jhIUymTJ5VREKyIhWm66LJiQt04F0UCDdodShpjWsY=
@@ -273,6 +277,7 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200301022130-244492dfa37a h1:GuSPYbZzB5/dcLNCwLQLsg3obCJtX9IJhpXkvY7kzk0=
 golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -294,6 +299,7 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299 h1:DYfZAGf2WMFjMxbgTjaC+2HC7NkNAQs+6Q8b9WEB/F4=
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -307,7 +313,9 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/go-playground/validator.v8 v8.18.2/go.mod h1:RX2a/7Ha8BgOhfk7j780h4/u/RRjR0eouCJSH80/M2Y=
@@ -319,10 +327,12 @@ gopkg.in/olebedev/go-duktape.v3 v3.0.0-20200316214253-d7b0ff38cac9/go.mod h1:uAJ
 gopkg.in/src-d/go-billy.v4 v4.3.2/go.mod h1:nDjArDMp+XMs1aFAESLRjfGSgfvoYN0hDfzEk0GjC98=
 gopkg.in/src-d/go-git-fixtures.v3 v3.5.0/go.mod h1:dLBcvytrw/TYZsNTWCnkNF2DSIlzWYqTe3rJR56Ac7g=
 gopkg.in/src-d/go-git.v4 v4.13.1/go.mod h1:nx5NYcxdKxq5fpltdHnPa2Exj4Sx0EclMWZQbYDu2z8=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
 gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

merkletree.go

@@ -60,6 +60,18 @@ var (
 // Hash is the generic type stored in the MerkleTree
 type Hash [32]byte
 
+// MarshalText implements the marshaler for the Hash type
+func (h Hash) MarshalText() ([]byte, error) {
+	return []byte(h.BigInt().String()), nil
+}
+
+// UnmarshalText implements the unmarshaler for the Hash type
+func (h *Hash) UnmarshalText(b []byte) error {
+	ha, err := NewHashFromString(string(b))
+	copy(h[:], ha[:])
+	return err
+}
+
 // String returns decimal representation in string format of the Hash
 func (h Hash) String() string {
 	s := h.BigInt().String()
@@ -140,6 +152,15 @@ func NewHashFromHex(h string) (*Hash, error) {
 	return NewHashFromBytes(common.SwapEndianness(b[:]))
 }
 
+// NewHashFromString returns a *Hash representation of the given decimal string
+func NewHashFromString(s string) (*Hash, error) {
+	bi, ok := new(big.Int).SetString(s, 10)
+	if !ok {
+		return nil, fmt.Errorf("Can not parse string to Hash")
+	}
+	return NewHashFromBigInt(bi), nil
+}
+
 // MerkleTree is the struct with the main elements of the MerkleTree
 type MerkleTree struct {
 	sync.RWMutex
@@ -825,38 +846,21 @@ func CircomSiblingsFromSiblings(siblings []*Hash, levels int) []*Hash {
 	for i := len(siblings); i < levels; i++ {
 		siblings = append(siblings, &HashZero)
 	}
-	siblings = append(siblings, &HashZero) // add extra level for circom compatibility
 	return siblings
 }
 
-// AllSiblingsCircom returns all the siblings of the proof. This function is
-// used to generate the siblings input for the circom circuits.
-func (p *Proof) AllSiblingsCircom(levels int) []*big.Int {
-	siblings := p.AllSiblings()
-	// Add the rest of empty levels to the siblings
-	for i := len(siblings); i < levels; i++ {
-		siblings = append(siblings, &HashZero)
-	}
-	siblings = append(siblings, &HashZero) // add extra level for circom compatibility
-	siblingsBigInt := make([]*big.Int, len(siblings))
-	for i, sibling := range siblings {
-		siblingsBigInt[i] = sibling.BigInt()
-	}
-	return siblingsBigInt
-}
-
 // CircomProcessorProof defines the ProcessorProof compatible with circom. Is
 // the data of the proof between the transition from one state to another.
 type CircomProcessorProof struct {
-	OldRoot  *Hash
-	NewRoot  *Hash
-	Siblings []*Hash
-	OldKey   *Hash
-	OldValue *Hash
-	NewKey   *Hash
-	NewValue *Hash
-	IsOld0   bool
-	Fnc      int // 0: NOP, 1: Update, 2: Insert, 3: Delete
+	OldRoot  *Hash   `json:"oldRoot"`
+	NewRoot  *Hash   `json:"newRoot"`
+	Siblings []*Hash `json:"siblings"`
+	OldKey   *Hash   `json:"oldKey"`
+	OldValue *Hash   `json:"oldValue"`
+	NewKey   *Hash   `json:"newKey"`
+	NewValue *Hash   `json:"newValue"`
+	IsOld0   bool    `json:"isOld0"`
+	Fnc      int     `json:"fnc"` // 0: NOP, 1: Update, 2: Insert, 3: Delete
 }
 
 // String returns a human readable string representation of the
@@ -883,27 +887,30 @@ func (p CircomProcessorProof) String() string {
 // CircomVerifierProof defines the VerifierProof compatible with circom. Is the
 // data of the proof that a certain leaf exists in the MerkleTree.
 type CircomVerifierProof struct {
-	Root     *Hash
-	Siblings []*big.Int
-	OldKey   *Hash
-	OldValue *Hash
-	IsOld0   bool
-	Key      *Hash
-	Value    *Hash
-	Fnc      int // 0: inclusion, 1: non inclusion
+	Root     *Hash   `json:"root"`
+	Siblings []*Hash `json:"siblings"`
+	OldKey   *Hash   `json:"oldKey"`
+	OldValue *Hash   `json:"oldValue"`
+	IsOld0   bool    `json:"isOld0"`
+	Key      *Hash   `json:"key"`
+	Value    *Hash   `json:"value"`
+	Fnc      int     `json:"fnc"` // 0: inclusion, 1: non inclusion
 }
 
 // GenerateCircomVerifierProof returns the CircomVerifierProof for a certain
 // key in the MerkleTree.  If the rootKey is nil, the current merkletree root
 // is used.
 func (mt *MerkleTree) GenerateCircomVerifierProof(k *big.Int, rootKey *Hash) (*CircomVerifierProof, error) {
+	if rootKey == nil {
+		rootKey = mt.Root()
+	}
 	p, v, err := mt.GenerateProof(k, rootKey)
 	if err != nil && err != ErrKeyNotFound {
 		return nil, err
 	}
 	var cp CircomVerifierProof
-	cp.Root = mt.rootKey
-	cp.Siblings = p.AllSiblingsCircom(mt.maxLevels)
+	cp.Root = rootKey
+	cp.Siblings = CircomSiblingsFromSiblings(p.AllSiblings(), mt.maxLevels)
 	cp.OldKey = &HashZero
 	cp.OldValue = &HashZero
 	cp.Key = NewHashFromBigInt(k)

merkletree_test.go

@@ -3,6 +3,7 @@ package merkletree
 import (
 	"bytes"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"math/big"
 	"testing"
@@ -623,7 +624,7 @@ func TestAddAndGetCircomProof(t *testing.T) {
 	assert.Equal(t, "1", cpp.NewKey.String())
 	assert.Equal(t, "2", cpp.NewValue.String())
 	assert.Equal(t, true, cpp.IsOld0)
-	assert.Equal(t, "[0 0 0 0 0 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
+	assert.Equal(t, "[0 0 0 0 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
 
 	cpp, err = mt.AddAndGetCircomProof(big.NewInt(33), big.NewInt(44))
 	assert.Nil(t, err)
@@ -634,7 +635,7 @@ func TestAddAndGetCircomProof(t *testing.T) {
 	assert.Equal(t, "33", cpp.NewKey.String())
 	assert.Equal(t, "44", cpp.NewValue.String())
 	assert.Equal(t, false, cpp.IsOld0)
-	assert.Equal(t, "[0 0 0 0 0 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
+	assert.Equal(t, "[0 0 0 0 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
 
 	cpp, err = mt.AddAndGetCircomProof(big.NewInt(55), big.NewInt(66))
 	assert.Nil(t, err)
@@ -645,7 +646,7 @@ func TestAddAndGetCircomProof(t *testing.T) {
 	assert.Equal(t, "55", cpp.NewKey.String())
 	assert.Equal(t, "66", cpp.NewValue.String())
 	assert.Equal(t, true, cpp.IsOld0)
-	assert.Equal(t, "[0 42948778... 0 0 0 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
+	assert.Equal(t, "[0 42948778... 0 0 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
 	// fmt.Println(cpp)
 }
 
@@ -674,5 +675,42 @@ func TestUpdateCircomProcessorProof(t *testing.T) {
 	assert.Equal(t, "10", cpp.NewKey.String())
 	assert.Equal(t, "1024", cpp.NewValue.String())
 	assert.Equal(t, false, cpp.IsOld0)
-	assert.Equal(t, "[19625419... 46910949... 18399594... 20473908... 0 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
+	assert.Equal(t, "[19625419... 46910949... 18399594... 20473908... 0 0 0 0 0 0]", fmt.Sprintf("%v", cpp.Siblings))
+}
+
+func TestTypesMarshalers(t *testing.T) {
+	// test Hash marshalers
+	h, err := NewHashFromString("42")
+	assert.Nil(t, err)
+	s, err := json.Marshal(h)
+	assert.Nil(t, err)
+	var h2 *Hash
+	err = json.Unmarshal(s, &h2)
+	assert.Nil(t, err)
+	assert.Equal(t, h, h2)
+
+	// create CircomProcessorProof
+	mt := newTestingMerkle(t, 10)
+	defer mt.db.Close()
+	for i := 0; i < 16; i++ {
+		k := big.NewInt(int64(i))
+		v := big.NewInt(int64(i * 2))
+		if err := mt.Add(k, v); err != nil {
+			t.Fatal(err)
+		}
+	}
+	_, v, _, err := mt.Get(big.NewInt(10))
+	assert.Nil(t, err)
+	assert.Equal(t, big.NewInt(20), v)
+	cpp, err := mt.Update(big.NewInt(10), big.NewInt(1024))
+	assert.Nil(t, err)
+
+	// test CircomProcessorProof marshalers
+	b, err := json.Marshal(&cpp)
+	assert.Nil(t, err)
+
+	var cpp2 *CircomProcessorProof
+	err = json.Unmarshal(b, &cpp2)
+	assert.Nil(t, err)
+	assert.Equal(t, cpp, cpp2)
 }