add serialisation methods

encrypt/encrypt.go

@@ -2,6 +2,7 @@ package encrypt
 
 import (
 	"fmt"
+	"strings"
 )
 
 // EncryptionAlgorithm is the interface that wraps the encryption algorithm method.
@@ -108,3 +109,17 @@ func (e *Encrypter) Decrypt(src []byte, key string) ([]byte, error) {
 	}
 	return nil, fmt.Errorf("no decryption method available")
 }
+
+// SerializeSettings converts the EncryptionAlgorithm and EncryptionLevel to a string.
+func SerializeSettings(algo EncryptionAlgorithm, level EncryptionLevel) string {
+	return fmt.Sprintf("%s:%s", algo.String(), level.String())
+}
+
+// DeserializeSettings converts a string to EncryptionAlgorithm and EncryptionLevel.
+func DeserializeSettings(settings string) (EncryptionAlgorithm, EncryptionLevel, error) {
+	parts := strings.Split(settings, ":")
+	if len(parts) != 2 {
+		return 0, 0, fmt.Errorf("invalid settings format")
+	}
+	return NewSettings(parts[0], parts[1])
+}

encrypt/encrypt_test.go

@@ -38,27 +38,73 @@ func Test_EncryptDecrypt(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.algo.String()+"_"+tt.level.String(), func(t *testing.T) {
 			encrypter, err := New(tt.algo, tt.level)
-			if err != nil {
-				t.Fatalf("New() error = %v", err)
-			}
+			require.NoError(t, err)
 
 			key, err := generateRandomString(int(tt.level / 8))
 			require.NoError(t, err)
 
 			plaintext := loremIpsumDolor
 			ciphertext, err := encrypter.Encrypt(plaintext, key)
-			if err != nil {
-				t.Fatalf("Encrypt() error = %v", err)
-			}
+			require.NoError(t, err)
 
 			decrypted, err := encrypter.Decrypt(ciphertext, key)
-			if err != nil {
-				t.Fatalf("Decrypt() error = %v", err)
-			}
+			require.NoError(t, err)
 
 			if !bytes.Equal(decrypted, plaintext) {
 				t.Errorf("Decrypted data = %v, want %v", decrypted, plaintext)
 			}
 		})
 	}
 }
+
+func Test_SerializeSettings(t *testing.T) {
+	tests := []struct {
+		algo   EncryptionAlgorithm
+		level  EncryptionLevel
+		expect string
+	}{
+		{EncryptionAlgoAESCFB, EncryptionLevelAES128, "cfb:aes-128"},
+		{EncryptionAlgoAESCFB, EncryptionLevelAES192, "cfb:aes-192"},
+		{EncryptionAlgoAESCFB, EncryptionLevelAES256, "cfb:aes-256"},
+		{EncryptionAlgoAESGCM, EncryptionLevelAES128, "gcm:aes-128"},
+		{EncryptionAlgoAESGCM, EncryptionLevelAES192, "gcm:aes-192"},
+		{EncryptionAlgoAESGCM, EncryptionLevelAES256, "gcm:aes-256"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.expect, func(t *testing.T) {
+			result := SerializeSettings(tt.algo, tt.level)
+			require.Equal(t, tt.expect, result)
+		})
+	}
+}
+
+func Test_DeserializeSettings(t *testing.T) {
+	tests := []struct {
+		input  string
+		algo   EncryptionAlgorithm
+		level  EncryptionLevel
+		hasErr bool
+	}{
+		{"cfb:aes-128", EncryptionAlgoAESCFB, EncryptionLevelAES128, false},
+		{"cfb:aes-192", EncryptionAlgoAESCFB, EncryptionLevelAES192, false},
+		{"cfb:aes-256", EncryptionAlgoAESCFB, EncryptionLevelAES256, false},
+		{"gcm:aes-128", EncryptionAlgoAESGCM, EncryptionLevelAES128, false},
+		{"gcm:aes-192", EncryptionAlgoAESGCM, EncryptionLevelAES192, false},
+		{"gcm:aes-256", EncryptionAlgoAESGCM, EncryptionLevelAES256, false},
+		{"invalid:settings", 0, 0, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			algo, level, err := DeserializeSettings(tt.input)
+			if tt.hasErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.algo, algo)
+				require.Equal(t, tt.level, level)
+			}
+		})
+	}
+}