diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index 16f3685852..ab962bd65d 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -17,13 +17,13 @@
 package vm
 
 import (
-	"github.com/tomochain/tomochain/params"
 	"math/big"
 
 	"github.com/tomochain/tomochain/common"
 	"github.com/tomochain/tomochain/common/math"
 	"github.com/tomochain/tomochain/core/types"
-	"golang.org/x/crypto/sha3"
+	"github.com/tomochain/tomochain/crypto"
+	"github.com/tomochain/tomochain/params"
 )
 
 var (
@@ -381,7 +381,7 @@ func opSha3(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]by
 	data := callContext.memory.GetPtr(offset.Int64(), size.Int64())
 
 	if interpreter.hasher == nil {
-		interpreter.hasher = sha3.NewLegacyKeccak256().(keccakState)
+		interpreter.hasher = crypto.NewKeccakState()
 	} else {
 		interpreter.hasher.Reset()
 	}
@@ -513,16 +513,21 @@ func opExtCodeCopy(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx
 // opExtCodeHash returns the code hash of a specified account.
 // There are several cases when the function is called, while we can relay everything
 // to `state.GetCodeHash` function to ensure the correctness.
-//   (1) Caller tries to get the code hash of a normal contract account, state
+//
+//	(1) Caller tries to get the code hash of a normal contract account, state
+//
 // should return the relative code hash and set it as the result.
 //
-//   (2) Caller tries to get the code hash of a non-existent account, state should
+//	(2) Caller tries to get the code hash of a non-existent account, state should
+//
 // return common.Hash{} and zero will be set as the result.
 //
-//   (3) Caller tries to get the code hash for an account without contract code,
+//	(3) Caller tries to get the code hash for an account without contract code,
+//
 // state should return emptyCodeHash(0xc5d246...) as the result.
 //
-//   (4) Caller tries to get the code hash of a precompiled account, the result
+//	(4) Caller tries to get the code hash of a precompiled account, the result
+//
 // should be zero or emptyCodeHash.
 //
 // It is worth noting that in order to avoid unnecessary create and clean,
@@ -531,10 +536,12 @@ func opExtCodeCopy(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx
 // If the precompile account is not transferred any amount on a private or
 // customized chain, the return value will be zero.
 //
-//   (5) Caller tries to get the code hash for an account which is marked as suicided
+//	(5) Caller tries to get the code hash for an account which is marked as suicided
+//
 // in the current transaction, the code hash of this account should be returned.
 //
-//   (6) Caller tries to get the code hash for an account which is marked as deleted,
+//	(6) Caller tries to get the code hash for an account which is marked as deleted,
+//
 // this account should be regarded as a non-existent account and zero should be returned.
 func opExtCodeHash(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
 	slot := callContext.stack.peek()
diff --git a/core/vm/interpreter.go b/core/vm/interpreter.go
index fc5b17a4f3..36027be797 100644
--- a/core/vm/interpreter.go
+++ b/core/vm/interpreter.go
@@ -17,11 +17,11 @@
 package vm
 
 import (
-	"hash"
 	"sync/atomic"
 
 	"github.com/tomochain/tomochain/common"
 	"github.com/tomochain/tomochain/common/math"
+	"github.com/tomochain/tomochain/crypto"
 	"github.com/tomochain/tomochain/log"
 )
 
@@ -70,14 +70,6 @@ type callCtx struct {
 	contract *Contract
 }
 
-// keccakState wraps sha3.state. In addition to the usual hash methods, it also supports
-// Read to get a variable amount of data from the hash state. Read is faster than Sum
-// because it doesn't copy the internal state, but also modifies the internal state.
-type keccakState interface {
-	hash.Hash
-	Read([]byte) (int, error)
-}
-
 // EVMInterpreter represents an EVM interpreter
 type EVMInterpreter struct {
 	evm *EVM
@@ -85,8 +77,8 @@ type EVMInterpreter struct {
 
 	intPool *intPool
 
-	hasher    keccakState // Keccak256 hasher instance shared across opcodes
-	hasherBuf common.Hash // Keccak256 hasher result array shared aross opcodes
+	hasher    crypto.KeccakState // Keccak256 hasher instance shared across opcodes
+	hasherBuf common.Hash        // Keccak256 hasher result array shared across opcodes
 
 	readOnly   bool   // Whether to throw on stateful modifications
 	returnData []byte // Last CALL's return data for subsequent reuse
diff --git a/crypto/crypto.go b/crypto/crypto.go
index 18386f85c0..6affee64ce 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -23,6 +23,7 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
+	"hash"
 	"io"
 	"io/ioutil"
 	"math/big"
@@ -30,38 +31,72 @@ import (
 
 	"github.com/tomochain/tomochain/common"
 	"github.com/tomochain/tomochain/common/math"
-	"github.com/tomochain/tomochain/crypto/sha3"
 	"github.com/tomochain/tomochain/rlp"
+	"golang.org/x/crypto/sha3"
 )
 
+// SignatureLength indicates the byte length required to carry a signature with recovery id.
+const SignatureLength = 64 + 1 // 64 bytes ECDSA signature + 1 byte recovery id
+
+// RecoveryIDOffset points to the byte offset within the signature that contains the recovery id.
+const RecoveryIDOffset = 64
+
+// DigestLength sets the signature digest exact length
+const DigestLength = 32
+
 var (
 	secp256k1_N, _  = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
 	secp256k1_halfN = new(big.Int).Div(secp256k1_N, big.NewInt(2))
 )
 
+var errInvalidPubkey = errors.New("invalid secp256k1 public key")
+
+// KeccakState wraps sha3.state. In addition to the usual hash methods, it also supports
+// Read to get a variable amount of data from the hash state. Read is faster than Sum
+// because it doesn't copy the internal state, but also modifies the internal state.
+type KeccakState interface {
+	hash.Hash
+	Read([]byte) (int, error)
+}
+
+// NewKeccakState creates a new KeccakState
+func NewKeccakState() KeccakState {
+	return sha3.NewLegacyKeccak256().(KeccakState)
+}
+
+// HashData hashes the provided data using the KeccakState and returns a 32 byte hash
+func HashData(kh KeccakState, data []byte) (h common.Hash) {
+	kh.Reset()
+	kh.Write(data)
+	kh.Read(h[:])
+	return h
+}
+
 // Keccak256 calculates and returns the Keccak256 hash of the input data.
 func Keccak256(data ...[]byte) []byte {
-	d := sha3.NewKeccak256()
+	b := make([]byte, 32)
+	d := NewKeccakState()
 	for _, b := range data {
 		d.Write(b)
 	}
-	return d.Sum(nil)
+	d.Read(b)
+	return b
 }
 
 // Keccak256Hash calculates and returns the Keccak256 hash of the input data,
 // converting it to an internal Hash data structure.
 func Keccak256Hash(data ...[]byte) (h common.Hash) {
-	d := sha3.NewKeccak256()
+	d := NewKeccakState()
 	for _, b := range data {
 		d.Write(b)
 	}
-	d.Sum(h[:0])
+	d.Read(h[:])
 	return h
 }
 
 // Keccak512 calculates and returns the Keccak512 hash of the input data.
 func Keccak512(data ...[]byte) []byte {
-	d := sha3.NewKeccak512()
+	d := sha3.NewLegacyKeccak512()
 	for _, b := range data {
 		d.Write(b)
 	}
diff --git a/trie/committer.go b/trie/committer.go
index 78ed86bb4a..43a31381b9 100644
--- a/trie/committer.go
+++ b/trie/committer.go
@@ -22,8 +22,8 @@ import (
 	"sync"
 
 	"github.com/tomochain/tomochain/common"
+	"github.com/tomochain/tomochain/crypto"
 	"github.com/tomochain/tomochain/rlp"
-	"golang.org/x/crypto/sha3"
 )
 
 // leafChanSize is the size of the leafCh. It's a pretty arbitrary number, to allow
@@ -46,7 +46,7 @@ type leaf struct {
 // processed sequentially - onleaf will never be called in parallel or out of order.
 type committer struct {
 	tmp sliceBuffer
-	sha keccakState
+	sha crypto.KeccakState
 
 	onleaf LeafCallback
 	leafCh chan *leaf
@@ -57,7 +57,7 @@ var committerPool = sync.Pool{
 	New: func() interface{} {
 		return &committer{
 			tmp: make(sliceBuffer, 0, 550), // cap is as large as a full FullNode.
-			sha: sha3.NewLegacyKeccak256().(keccakState),
+			sha: crypto.NewKeccakState(),
 		}
 	},
 }
diff --git a/trie/hasher.go b/trie/hasher.go
index 8a2ea18068..e306b35e7b 100644
--- a/trie/hasher.go
+++ b/trie/hasher.go
@@ -17,21 +17,12 @@
 package trie
 
 import (
-	"hash"
 	"sync"
 
+	"github.com/tomochain/tomochain/crypto"
 	"github.com/tomochain/tomochain/rlp"
-	"golang.org/x/crypto/sha3"
 )
 
-// keccakState wraps sha3.state. In addition to the usual hash methods, it also supports
-// Read to get a variable amount of data from the hash state. Read is faster than Sum
-// because it doesn't copy the internal state, but also modifies the internal state.
-type keccakState interface {
-	hash.Hash
-	Read([]byte) (int, error)
-}
-
 type sliceBuffer []byte
 
 func (b *sliceBuffer) Write(data []byte) (n int, err error) {
@@ -46,7 +37,7 @@ func (b *sliceBuffer) Reset() {
 // hasher is a type used for the trie Hash operation. A hasher has some
 // internal preallocated temp space
 type hasher struct {
-	sha      keccakState
+	sha      crypto.KeccakState
 	tmp      sliceBuffer
 	parallel bool // Whether to use paralallel threads when hashing
 }
@@ -56,7 +47,7 @@ var hasherPool = sync.Pool{
 	New: func() interface{} {
 		return &hasher{
 			tmp: make(sliceBuffer, 0, 550), // cap is as large as a full FullNode.
-			sha: sha3.NewLegacyKeccak256().(keccakState),
+			sha: crypto.NewKeccakState(),
 		}
 	},
 }