goint there

key.go

@@ -3,7 +3,11 @@ package main
 import (
 	"crypto/rand"
 	"crypto/rsa"
+	"encoding/json"
 	"errors"
+	"github.com/didiercrunch/ecrypto/shared"
+	"os"
+	"path"
 )
 
 type KeyGenerator struct {
@@ -11,6 +15,38 @@ type KeyGenerator struct {
 	privateKey *PrivateKey
 }
 
+func (this *KeyGenerator) ensureDirectoryExists(dir string) error {
+	stat, err := os.Stat(dir)
+	if os.IsNotExist(err) {
+		return os.Mkdir(dir, 0700)
+	} else if err != nil {
+		return err
+	} else if !stat.IsDir() {
+		return errors.New(dir + " is not a directory")
+	}
+	return nil
+
+}
+
+func (this *KeyGenerator) saveKeyAsJSON(key interface{}, filepath string) error {
+	w, err := os.Create(filepath)
+	if err != nil {
+		return err
+	}
+	enc := json.NewEncoder(w)
+	return enc.Encode(key)
+}
+
+func (this *KeyGenerator) saveKeys(dirPath string) error {
+	if err := this.ensureDirectoryExists(dirPath); err != nil {
+		return err
+	}
+	if err := this.saveKeyAsJSON(this.publicKey, path.Join(dirPath, "publickey.json")); err != nil {
+		return err
+	}
+	return this.saveKeyAsJSON(this.privateKey, path.Join(dirPath, "privatekey.json"))
+}
+
 func (this *KeyGenerator) createRSAKey(size int) error {
 	rsaPrivateKey, err := rsa.GenerateKey(rand.Reader, size)
 	if err != nil {
@@ -24,9 +60,9 @@ func (this *KeyGenerator) createRSAKey(size int) error {
 	return nil
 }
 
-func (this *KeyGenerator) CreateNewKey(size int, password string) error {
+func (this *KeyGenerator) CreateNewKey(size int) error {
 	if err := this.createRSAKey(size); err != nil {
 		return err
 	}
-	return nil
+	return this.saveKeys(shared.GetEcryptoDir())
 }

key_test.go

@@ -1,6 +1,11 @@
 package main
 
 import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"path"
+	"reflect"
 	"testing"
 )
 
@@ -16,3 +21,53 @@ func TestCreateRSAKey(t *testing.T) {
 		t.Fail()
 	}
 }
+
+func TestSaveKeyAsJSON(t *testing.T) {
+	kc := new(KeyGenerator)
+	if err := kc.CreateNewKey(100); err != nil {
+		t.Error(err)
+		return
+	}
+	file, err := ioutil.TempFile(os.TempDir(), "prefix")
+
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer os.Remove(file.Name())
+	if err := kc.saveKeyAsJSON(kc.privateKey, file.Name()); err != nil {
+		t.Error(err)
+	}
+	data, err := ioutil.ReadFile(file.Name())
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	pk := new(PrivateKey)
+	if err := json.Unmarshal(data, pk); err != nil {
+		t.Error(err)
+		return
+	}
+
+	if !reflect.DeepEqual(pk.Key, kc.privateKey.Key) {
+		t.Fail()
+	}
+}
+
+func TestEnsureDirectoryExists(t *testing.T) {
+	kc := new(KeyGenerator)
+	fooDir := path.Join(os.TempDir(), "fds89d")
+	defer os.Remove(fooDir)
+	if err := kc.ensureDirectoryExists(fooDir); err != nil {
+		t.Error(err)
+		return
+	}
+	if _, err := os.Stat(fooDir); err != nil {
+		t.Error(err)
+		return
+	}
+	if err := kc.ensureDirectoryExists(fooDir); err != nil {
+		t.Error(err)
+	}
+
+}

main.go

@@ -17,7 +17,10 @@ var createKeyCommand = cli.Command{
 	},
 	Action: func(c *cli.Context) {
 		keyGenerator := new(KeyGenerator)
-		keyGenerator.CreateNewKey(c.Int("size"), c.String("password"))
+		fmt.Println("creating key")
+		if err := keyGenerator.CreateNewKey(c.Int("size")); err != nil {
+			fmt.Println("error while creating the key\n", err)
+		}
 	},
 }
 
@@ -29,6 +32,5 @@ func main() {
 		createKeyCommand,
 	}
 
-	fmt.Println(os.Args)
 	app.Run(os.Args)
 }

marshal.go

@@ -2,6 +2,9 @@ package main
 
 import (
 	"crypto/rsa"
+	"encoding/json"
+	"errors"
+	"fmt"
 	"math/big"
 )
 
@@ -12,20 +15,16 @@ const (
 )
 
 type PrivateKey struct {
-	Name        string
-	Description string
-	Type        string // rsa, el gamal,...
 	Version string
-	Key         interface{}
+	Type    string // rsa, el gamal,...
+	Key     *RSAPrivateKey
 	Accept  *AcceptMethods
 }
 
 type PublicKey struct {
-	Name        string
-	Description string
 	Type    string // rsa, el gamal,...
 	Version string
-	Key         interface{}
+	Key     *RSAPublicKey
 	Accept  *AcceptMethods
 }
 
@@ -35,13 +34,102 @@ type RSAPublicKey struct {
 }
 
 type RSAPrivateKey struct {
-	N *big.Int
-	P *big.Int
-	Q *big.Int
-	D *big.Int
+	N *big.Int `json:"n,omitempty"`
+	P *big.Int `json:"p,omitempty"`
+	Q *big.Int `json:"q,omitempty"`
+	D *big.Int `json:"d,omitempty"`
+	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

marshal_test.go

@@ -2,7 +2,9 @@ package main
 
 import (
 	"crypto/rsa"
+	"encoding/json"
 	"math/big"
+	"reflect"
 	"testing"
 )
 
@@ -13,15 +15,11 @@ func b(x int64) *big.Int {
 func TestGetDefaultRSAPublicKey(t *testing.T) {
 	key := &rsa.PublicKey{b(31 * 11), 3}
 	pk := GetDefaultRSAPublicKey(key)
-	niceKey, ok := pk.Key.(*RSAPublicKey)
-	if !ok {
-		t.Error("bad key type")
-		return
-	}
-	if big.NewInt(31*11).Cmp(niceKey.N) != 0 {
+
+	if big.NewInt(31*11).Cmp(pk.Key.N) != 0 {
 		t.Error("bad N")
 	}
-	if 3 != niceKey.E {
+	if 3 != pk.Key.E {
 		t.Error("bad e")
 	}
 }
@@ -37,21 +35,50 @@ func TestGetDefaultRSAPrivateKey(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
-	niceKey, ok := pk.Key.(*RSAPrivateKey)
-	if !ok {
-		t.Error("bad key type")
-		return
-	}
-	if niceKey.D.Int64() != 3 {
+	if pk.Key.D.Int64() != 3 {
 		t.Error("bad D")
 	}
-	if niceKey.E != 7 {
+	if pk.Key.E != 7 {
 		t.Error("bad D")
 	}
-	if niceKey.P.Int64() != 3 {
+	if pk.Key.P.Int64() != 3 {
 		t.Error("bad D")
 	}
-	if niceKey.Q.Int64() != 11 {
+	if pk.Key.Q.Int64() != 11 {
 		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()
+	}
+}

shared/permisions.go

@@ -0,0 +1,9 @@
+package shared
+
+import (
+	"os"
+)
+
+const DIRECTORY_PERMISSION os.FileMode = 0700
+const PUBLIC_KEY_PERMISSION os.FileMode = 0644
+const PRIVATE_KEY_PERMISSION os.FileMode = 0600

shared/shared.go

@@ -0,0 +1,39 @@
+package shared
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path"
+)
+
+var ecryptoDir string
+
+func ensureEcryptoDirectoryIsOkay(dir string) error {
+	stat, err := os.Stat(dir)
+	if os.IsNotExist(err) {
+		return os.Mkdir(dir, DIRECTORY_PERMISSION)
+	} else if err != nil {
+		return err
+	} else if !stat.IsDir() {
+		return errors.New(dir + " is not a directory")
+	} else if perm := stat.Mode().Perm(); perm != DIRECTORY_PERMISSION {
+		msg := fmt.Sprintf("root folder has bad file permission.  should be set to %v  but vas %v", DIRECTORY_PERMISSION, perm)
+		return errors.New(msg)
+	}
+	return nil
+
+}
+
+func init() {
+	ecryptoDir = path.Join(os.Getenv("HOME"), ".ecrypto")
+	if err := ensureEcryptoDirectoryIsOkay(ecryptoDir); err != nil {
+		fmt.Println("cannot work with eCrypto directory", err)
+		os.Exit(1)
+
+	}
+}
+
+func GetEcryptoDir() string {
+	return ecryptoDir
+}