diff --git a/crypto/crypto.go b/crypto/crypto.go
index a0dddcda..96f99954 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -3,6 +3,7 @@ package crypto
 import (
 	"crypto"
 	"crypto/hmac"
+	"encoding/base64"
 	"fmt"
 
 	"golang.org/x/crypto/md4"
@@ -45,11 +46,16 @@ func Hash(hash crypto.Hash, value string) (string, error) {
 }
 
 // Hmac the Keyed-Hash Message Authentication Code (HMAC)
-func Hmac(hash crypto.Hash, value string, key string) (string, error) {
+func Hmac(hash crypto.Hash, value string, key string, encoding ...string) (string, error) {
 	mac := hmac.New(hash.New, []byte(key))
 	_, err := mac.Write([]byte(value))
 	if err != nil {
 		return "", err
 	}
+
+	if len(encoding) > 0 && encoding[0] == "base64" {
+		return base64.StdEncoding.EncodeToString(mac.Sum(nil)), nil
+	}
+
 	return fmt.Sprintf("%x", mac.Sum(nil)), nil
 }
diff --git a/crypto/crypto_test.go b/crypto/crypto_test.go
index a1552942..2a85bbd4 100644
--- a/crypto/crypto_test.go
+++ b/crypto/crypto_test.go
@@ -54,3 +54,15 @@ func TestSHA256(t *testing.T) {
 	res = gou.NewProcess("yao.crypto.hmac", args...).Run()
 	assert.Equal(t, "b8ad08a3a547e35829b821b75370301dd8c4b06bdd7771f9b541a75914068718", res)
 }
+
+func TestSHA1Base64(t *testing.T) {
+	// Hash
+	args := []interface{}{"SHA1", "123456"}
+	res := gou.NewProcess("yao.crypto.hash", args...).Run()
+	assert.Equal(t, "7c4a8d09ca3762af61e59520943dc26494f8941b", res)
+
+	// HMac
+	args = append(args, "123456", "base64")
+	res = gou.NewProcess("yao.crypto.hmac", args...).Run()
+	assert.Equal(t, "dLVbarK45DisgQQ142njBHs5UdA=", res)
+}
diff --git a/crypto/process.go b/crypto/process.go
index ee90980a..235950cb 100644
--- a/crypto/process.go
+++ b/crypto/process.go
@@ -14,7 +14,7 @@ func init() {
 // Args[0] string: the hash function name. MD4/MD5/SHA1/SHA224/SHA256/SHA384/SHA512/MD5SHA1/RIPEMD160/SHA3_224/SHA3_256/SHA3_384/SHA3_512/SHA512_224/SHA512_256/BLAKE2s_256/BLAKE2b_256/BLAKE2b_384/BLAKE2b_512
 // Args[1] string: value
 func ProcessHash(process *gou.Process) interface{} {
-	process.ValidateArgNums(1)
+	process.ValidateArgNums(2)
 	typ := process.ArgsString(0)
 	value := process.ArgsString(1)
 
@@ -34,8 +34,9 @@ func ProcessHash(process *gou.Process) interface{} {
 // Args[0] string: the hash function name. MD4/MD5/SHA1/SHA224/SHA256/SHA384/SHA512/MD5SHA1/RIPEMD160/SHA3_224/SHA3_256/SHA3_384/SHA3_512/SHA512_224/SHA512_256/BLAKE2s_256/BLAKE2b_256/BLAKE2b_384/BLAKE2b_512
 // Args[1] string: value
 // Args[2] string: key
+// Args[3] string: base64
 func ProcessHmac(process *gou.Process) interface{} {
-	process.ValidateArgNums(2)
+	process.ValidateArgNums(3)
 	typ := process.ArgsString(0)
 	value := process.ArgsString(1)
 	key := process.ArgsString(2)
@@ -45,7 +46,12 @@ func ProcessHmac(process *gou.Process) interface{} {
 		exception.New("%s does not support", 400, typ).Throw()
 	}
 
-	res, err := Hmac(h, value, key)
+	encoding := ""
+	if process.NumOfArgs() > 3 {
+		encoding = process.ArgsString(3)
+	}
+
+	res, err := Hmac(h, value, key, encoding)
 	if err != nil {
 		exception.New("%s error: %s value: %s", 400, typ, err, value).Throw()
 	}