Add verushash support

go.mod

@@ -3,6 +3,7 @@ module github.com/asherda/lightwalletd
 go 1.12
 
 require (
+	github.com/asherda/go-verushash v0.0.0-20200826043445-bbbaa481fb00
 	github.com/btcsuite/btcd v0.20.1-beta
 	github.com/golang/protobuf v1.4.1
 	github.com/gopherjs/gopherjs v0.0.0-20191106031601-ce3c9ade29de // indirect

go.sum

@@ -8,6 +8,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/asherda/go-verushash v0.0.0-20200826043445-bbbaa481fb00 h1:Xb01DuneZ5o/FGcgd0fsV8geANOnldVKk4xofGr5EMc=
+github.com/asherda/go-verushash v0.0.0-20200826043445-bbbaa481fb00/go.mod h1:yEd2IXjQPJEufs9rjOgQCacBsAA7mAvJezdtHpyocVY=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=

parser/block_header.go

@@ -7,10 +7,11 @@ package parser
 
 import (
 	"bytes"
-	"crypto/sha256"
 	"encoding/binary"
 	"math/big"
+	"unsafe"
 
+	"github.com/asherda/go-verushash"
 	"github.com/asherda/lightwalletd/parser/internal/bytestring"
 	"github.com/pkg/errors"
 )
@@ -20,6 +21,9 @@ const (
 	equihashSizeMainnet             = 1344 // size of a mainnet / testnet Equihash solution in bytes
 )
 
+// Initialize verushash object once.
+var verusHash = verushash.NewVerushash()
+
 // RawBlockHeader implements the block header as defined in version
 // 2018.0-beta-29 of the Zcash Protocol Spec.
 type RawBlockHeader struct {
@@ -206,11 +210,16 @@ func (hdr *BlockHeader) GetDisplayHash() []byte {
 	}
 
 	// SHA256d
-	digest := sha256.Sum256(serializedHeader)
-	digest = sha256.Sum256(digest[:])
+	//digest := sha256.Sum256(serializedHeader)
+	//digest = sha256.Sum256(digest[:])
+
+	// VerusHash
 
+	hash := make([]byte, 32)
+	ptrHash := uintptr(unsafe.Pointer(&hash[0]))
+	hashHeader(serializedHeader, ptrHash)
 	// Convert to big-endian
-	hdr.cachedHash = Reverse(digest[:])
+	hdr.cachedHash = Reverse(hash)
 	return hdr.cachedHash
 }
 
@@ -223,13 +232,34 @@ func (hdr *BlockHeader) GetEncodableHash() []byte {
 	}
 
 	// SHA256d
-	digest := sha256.Sum256(serializedHeader)
-	digest = sha256.Sum256(digest[:])
-
-	return digest[:]
+	//digest := sha256.Sum256(serializedHeader)
+	//digest = sha256.Sum256(digest[:])
+
+	// Verushash
+	hash := make([]byte, 32)
+	ptrHash := uintptr(unsafe.Pointer(&hash[0]))
+	hashHeader(serializedHeader, ptrHash)
+	return hash
 }
 
 // GetDisplayPrevHash returns the block hash in big-endian order.
 func (hdr *BlockHeader) GetDisplayPrevHash() []byte {
 	return Reverse(hdr.HashPrevBlock)
 }
+
+func hashHeader(serializedHeader []byte, ptrHash uintptr) {
+	length := len(serializedHeader)
+	if serializedHeader[0] == 4 && serializedHeader[2] >= 1 {
+		if length < 144 || serializedHeader[143] < 3 {
+			verusHash.Verushash_v2b(string(serializedHeader), length, ptrHash)
+		} else {
+			if serializedHeader[143] < 4 {
+				verusHash.Verushash_v2b1(string(serializedHeader), length, ptrHash)
+			} else {
+				verusHash.Verushash_v2b2(string(serializedHeader), ptrHash)
+			}
+		}
+	} else {
+		verusHash.Verushash(string(serializedHeader), length, ptrHash)
+	}
+}