diff --git a/encrypter/aes_ofb_encrypter_test.go b/encrypter/aes_ofb_encrypter_test.go
index 09916ae..6fc0303 100644
--- a/encrypter/aes_ofb_encrypter_test.go
+++ b/encrypter/aes_ofb_encrypter_test.go
@@ -4,10 +4,11 @@ import (
 	"crypto/aes"
 	"crypto/cipher"
 	"crypto/rand"
-	. "github.com/didiercrunch/filou/helper"
 	"reflect"
 	"strings"
 	"testing"
+
+	. "github.com/didiercrunch/filou/helper"
 )
 
 func NewMockAESOFBEncrypter() *AESOFBEncrypter {
diff --git a/encrypter/rsa_encryptor_test.go b/encrypter/rsa_encryptor_test.go
index f3e504e..2d3b761 100644
--- a/encrypter/rsa_encryptor_test.go
+++ b/encrypter/rsa_encryptor_test.go
@@ -6,8 +6,9 @@ import (
 	"crypto/rsa"
 	"crypto/sha512"
 	"fmt"
-	"github.com/didiercrunch/filou/helper"
 	"testing"
+
+	"github.com/didiercrunch/filou/helper"
 )
 
 func TestHashIOReader(t *testing.T) {
diff --git a/keys/encoding.go b/keys/encoding.go
new file mode 100644
index 0000000..427aea5
--- /dev/null
+++ b/keys/encoding.go
@@ -0,0 +1,99 @@
+package keys
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math/big"
+)
+
+// All the method to encode/decode keys to json, yaml...
+
+type encodingRSAKey struct {
+	N string
+	P string
+	Q string
+	D string
+	E int
+}
+
+func (this *encodingRSAKey) CreateFromRSAPrivateKey(key *RSAPrivateKey) *encodingRSAKey {
+	this.N = fmt.Sprintf("%x", key.N)
+	this.P = fmt.Sprintf("%x", key.P)
+	this.Q = fmt.Sprintf("%x", key.Q)
+	this.D = fmt.Sprintf("%x", key.D)
+	this.E = key.E
+	return this
+}
+
+func (this *encodingRSAKey) CreateFromRSAPublicKey(key *RSAPublicKey) *encodingRSAKey {
+	this.N = fmt.Sprintf("%x", key.N)
+	this.E = key.E
+	return this
+}
+
+func (this *encodingRSAKey) SetRSAPrivateKey(key *RSAPrivateKey) (*RSAPrivateKey, error) {
+	if i, ok := new(big.Int).SetString(this.N, 16); !ok {
+		return nil, errors.New("cannot parse string has hexadecimal string")
+	} else {
+		key.N = i
+	}
+
+	if i, ok := new(big.Int).SetString(this.P, 16); !ok {
+		return nil, errors.New("cannot parse string has hexadecimal string")
+	} else {
+		key.P = i
+	}
+
+	if i, ok := new(big.Int).SetString(this.Q, 16); !ok {
+		return nil, errors.New("cannot parse string has hexadecimal string")
+	} else {
+		key.Q = i
+	}
+
+	if i, ok := new(big.Int).SetString(this.D, 16); !ok {
+		return nil, errors.New("cannot parse string has hexadecimal string")
+	} else {
+		key.D = i
+	}
+	key.E = this.E
+	return key, nil
+}
+
+func (this *encodingRSAKey) SetRSAPublicKey(key *RSAPublicKey) (*RSAPublicKey, error) {
+	if i, ok := new(big.Int).SetString(this.N, 16); !ok {
+		return nil, errors.New("cannot parse string has hexadecimal string")
+	} else {
+		key.N = i
+	}
+	key.E = this.E
+	return key, nil
+}
+
+func (this *RSAPrivateKey) MarshalJSON() ([]byte, error) {
+	e := new(encodingRSAKey)
+	return json.Marshal(e.CreateFromRSAPrivateKey(this))
+}
+
+func (this *RSAPrivateKey) UnmarshalJSON(data []byte) error {
+	obj := new(encodingRSAKey)
+	if err := json.Unmarshal(data, obj); err != nil {
+		return err
+	}
+	_, err := obj.SetRSAPrivateKey(this)
+	return err
+}
+
+func (this *RSAPublicKey) MarshalJSON() ([]byte, error) {
+	e := new(encodingRSAKey)
+	return json.Marshal(e.CreateFromRSAPublicKey(this))
+}
+
+func (this *RSAPublicKey) UnmarshalJSON(data []byte) error {
+	obj := new(encodingRSAKey)
+	if err := json.Unmarshal(data, obj); err != nil {
+		return err
+	}
+	_, err := obj.SetRSAPublicKey(this)
+	return err
+}
diff --git a/keys/encoding_test.go b/keys/encoding_test.go
new file mode 100644
index 0000000..4e587a9
--- /dev/null
+++ b/keys/encoding_test.go
@@ -0,0 +1,43 @@
+package keys
+
+import (
+	"encoding/json"
+	"reflect"
+	"testing"
+
+	. "github.com/didiercrunch/filou/helper"
+)
+
+func TestRSAPrivateKeyJsonification(t *testing.T) {
+	key := &RSAPrivateKey{B(1023), B(2112), B(328723), B(2332), 89}
+	data, err := json.Marshal(key)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	key2 := new(RSAPrivateKey)
+	if err := json.Unmarshal(data, key2); err != nil {
+		t.Error(err)
+		return
+	}
+	if !reflect.DeepEqual(key, key2) {
+		t.Fail()
+	}
+}
+
+func TestRSAPublicKeyJsonification(t *testing.T) {
+	key := &RSAPublicKey{B(1023), 89}
+	data, err := json.Marshal(key)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	key2 := new(RSAPublicKey)
+	if err := json.Unmarshal(data, key2); err != nil {
+		t.Error(err)
+		return
+	}
+	if !reflect.DeepEqual(key, key2) {
+		t.Fail()
+	}
+}
diff --git a/keys/keys.go b/keys/keys.go
index 3e23f75..659a61f 100644
--- a/keys/keys.go
+++ b/keys/keys.go
@@ -2,9 +2,6 @@ package keys
 
 import (
 	"crypto/rsa"
-	"encoding/json"
-	"errors"
-	"fmt"
 	"math/big"
 
 	"github.com/didiercrunch/filou/shared"
@@ -43,95 +40,6 @@ type RSAPrivateKey struct {
 	E int      `json:"e,omitempty"`
 }
 
-type encodingRSAKey struct {
-	N string
-	P string
-	Q string
-	D string
-	E int
-}
-
-func (this *encodingRSAKey) CreateFromRSAPrivateKey(key *RSAPrivateKey) *encodingRSAKey {
-	this.N = fmt.Sprintf("%x", key.N)
-	this.P = fmt.Sprintf("%x", key.P)
-	this.Q = fmt.Sprintf("%x", key.Q)
-	this.D = fmt.Sprintf("%x", key.D)
-	this.E = key.E
-	return this
-}
-
-func (this *encodingRSAKey) CreateFromRSAPublicKey(key *RSAPublicKey) *encodingRSAKey {
-	this.N = fmt.Sprintf("%x", key.N)
-	this.E = key.E
-	return this
-}
-
-func (this *encodingRSAKey) SetRSAPrivateKey(key *RSAPrivateKey) (*RSAPrivateKey, error) {
-	if i, ok := new(big.Int).SetString(this.N, 16); !ok {
-		return nil, errors.New("cannot parse string has hexadecimal string")
-	} else {
-		key.N = i
-	}
-
-	if i, ok := new(big.Int).SetString(this.P, 16); !ok {
-		return nil, errors.New("cannot parse string has hexadecimal string")
-	} else {
-		key.P = i
-	}
-
-	if i, ok := new(big.Int).SetString(this.Q, 16); !ok {
-		return nil, errors.New("cannot parse string has hexadecimal string")
-	} else {
-		key.Q = i
-	}
-
-	if i, ok := new(big.Int).SetString(this.D, 16); !ok {
-		return nil, errors.New("cannot parse string has hexadecimal string")
-	} else {
-		key.D = i
-	}
-	key.E = this.E
-	return key, nil
-}
-
-func (this *encodingRSAKey) SetRSAPublicKey(key *RSAPublicKey) (*RSAPublicKey, error) {
-	if i, ok := new(big.Int).SetString(this.N, 16); !ok {
-		return nil, errors.New("cannot parse string has hexadecimal string")
-	} else {
-		key.N = i
-	}
-	key.E = this.E
-	return key, nil
-}
-
-func (this *RSAPrivateKey) MarshalJSON() ([]byte, error) {
-	e := new(encodingRSAKey)
-	return json.Marshal(e.CreateFromRSAPrivateKey(this))
-}
-
-func (this *RSAPrivateKey) UnmarshalJSON(data []byte) error {
-	obj := new(encodingRSAKey)
-	if err := json.Unmarshal(data, obj); err != nil {
-		return err
-	}
-	_, err := obj.SetRSAPrivateKey(this)
-	return err
-}
-
-func (this *RSAPublicKey) MarshalJSON() ([]byte, error) {
-	e := new(encodingRSAKey)
-	return json.Marshal(e.CreateFromRSAPublicKey(this))
-}
-
-func (this *RSAPublicKey) UnmarshalJSON(data []byte) error {
-	obj := new(encodingRSAKey)
-	if err := json.Unmarshal(data, obj); err != nil {
-		return err
-	}
-	_, err := obj.SetRSAPublicKey(this)
-	return err
-}
-
 type AcceptMethods struct {
 	BlocCypher      string
 	BlockCypherMode string
diff --git a/keys/keys_test.go b/keys/keys_test.go
index dc0788d..9461e3a 100644
--- a/keys/keys_test.go
+++ b/keys/keys_test.go
@@ -2,9 +2,7 @@ package keys
 
 import (
 	"crypto/rsa"
-	"encoding/json"
 	"math/big"
-	"reflect"
 	"testing"
 
 	. "github.com/didiercrunch/filou/helper"
@@ -46,37 +44,3 @@ func TestGetDefaultRSAPrivateKey(t *testing.T) {
 		t.Error("bad D")
 	}
 }
-
-func TestRSAPrivateKeyJsonification(t *testing.T) {
-	key := &RSAPrivateKey{B(1023), B(2112), B(328723), B(2332), 89}
-	data, err := json.Marshal(key)
-	if err != nil {
-		t.Error(err)
-		return
-	}
-	key2 := new(RSAPrivateKey)
-	if err := json.Unmarshal(data, key2); err != nil {
-		t.Error(err)
-		return
-	}
-	if !reflect.DeepEqual(key, key2) {
-		t.Fail()
-	}
-}
-
-func TestRSAPublicKeyJsonification(t *testing.T) {
-	key := &RSAPublicKey{B(1023), 89}
-	data, err := json.Marshal(key)
-	if err != nil {
-		t.Error(err)
-		return
-	}
-	key2 := new(RSAPublicKey)
-	if err := json.Unmarshal(data, key2); err != nil {
-		t.Error(err)
-		return
-	}
-	if !reflect.DeepEqual(key, key2) {
-		t.Fail()
-	}
-}
diff --git a/main.go b/main.go
index fc62904..e2c5f49 100644
--- a/main.go
+++ b/main.go
@@ -2,9 +2,10 @@ package main
 
 import (
 	"fmt"
+	"os"
+
 	"github.com/codegangsta/cli"
 	"github.com/didiercrunch/filou/keygenerator"
-	"os"
 )
 
 var createKeyCommand = cli.Command{
diff --git a/main_test.go b/main_test.go
index 55abaae..db68c0c 100644
--- a/main_test.go
+++ b/main_test.go
@@ -1,8 +1,9 @@
 package main
 
 import (
-	"github.com/codegangsta/cli"
 	"testing"
+
+	"github.com/codegangsta/cli"
 )
 
 func TestCreateKeyCommand(t *testing.T) {