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Merge pull request #8 from sharathrnair87/feature/encyption
Encypt using pbkdf2 algo
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| package cmd | ||
|
|
||
| import ( | ||
| "crypto/aes" | ||
| "crypto/cipher" | ||
| "crypto/rand" | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "golang.org/x/crypto/pbkdf2" | ||
| "io" | ||
| "math/big" | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| func deriveKey(passphrase string, salt []byte) ([]byte, []byte, error) { | ||
| if salt == nil { | ||
| salt = make([]byte, 32) | ||
| if _, err := io.ReadFull(rand.Reader, salt); err != nil { | ||
| return nil, nil, fmt.Errorf("%w", err) | ||
| } | ||
| } | ||
| key := pbkdf2.Key([]byte(passphrase), salt, 4096, 32, sha256.New) | ||
| return key, salt, nil | ||
| } | ||
|
|
||
| func encryptContents(filestream []byte, passphrase string) ([]byte, error) { | ||
| key, salt, err := deriveKey(passphrase, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("❌ Error generating salt: %w", err) | ||
| } | ||
| block, err := aes.NewCipher(key) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("❌ Error creating cipher: %w", err) | ||
| } | ||
|
|
||
| aesgcm, err := cipher.NewGCM(block) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("❌ Error creating GCM: %w", err) | ||
| } | ||
|
|
||
| nonce := make([]byte, aesgcm.NonceSize()) | ||
| if _, err = io.ReadFull(rand.Reader, nonce); err != nil { | ||
| return nil, fmt.Errorf("❌ Error generating nonce: %w", err) | ||
| } | ||
|
|
||
| ciphertext := aesgcm.Seal(nonce, nonce, filestream, nil) | ||
|
|
||
| if ciphertext == nil { | ||
| return nil, fmt.Errorf("❌ Error creating output file: %w", err) | ||
| } | ||
|
|
||
| encryptStream := fmt.Sprintf("%s-%s", hex.EncodeToString(salt), hex.EncodeToString(ciphertext)) | ||
|
|
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| return []byte(encryptStream), nil | ||
| } | ||
|
|
||
| func decryptFile(filename string, passphrase string) (string, error) { | ||
| outfileName := strings.TrimSuffix(filename, ".enc") | ||
| data, err := os.ReadFile(filename) | ||
| if err != nil { | ||
| return "", fmt.Errorf("❌ Error reading file: %w", err) | ||
| } | ||
|
|
||
| parts := strings.Split(string(data), "-") | ||
| if len(parts) != 2 { | ||
| return "", fmt.Errorf("❌ Error invalid ciphertext format") | ||
| } | ||
|
|
||
| salt, _ := hex.DecodeString(parts[0]) | ||
| ciphertext, _ := hex.DecodeString(parts[1]) | ||
|
|
||
| key, _, err := deriveKey(passphrase, salt) | ||
| if err != nil { | ||
| return "", fmt.Errorf("❌ Error parsing salt: %w", err) | ||
| } | ||
| block, err := aes.NewCipher(key) | ||
| if err != nil { | ||
| return "", fmt.Errorf("❌ Error creating cipher: %w", err) | ||
| } | ||
|
|
||
| aesgcm, err := cipher.NewGCM(block) | ||
| if err != nil { | ||
| return "", fmt.Errorf("❌ Error creating GCM: %w", err) | ||
| } | ||
|
|
||
| nonceSize := aesgcm.NonceSize() | ||
| nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:] | ||
| plaintext, err := aesgcm.Open(nil, nonce, ciphertext, nil) | ||
| if err != nil { | ||
| return "", fmt.Errorf("❌ Error decrypting: %w", err) | ||
| } | ||
|
|
||
| err = os.WriteFile(outfileName, plaintext, 0644) | ||
| if err != nil { | ||
| return "", fmt.Errorf("❌ Error writing decrypted file: %w", err) | ||
| } | ||
|
|
||
| return "", nil | ||
| } | ||
|
|
||
| func GenPassphrase() { | ||
| min := 24 | ||
| max := 48 | ||
|
|
||
| bigN, err := rand.Int(rand.Reader, big.NewInt(int64(max-min+1))) | ||
| if err != nil { | ||
| fmt.Println("❌ Unable to generate random integer" + err.Error()) | ||
| } | ||
|
|
||
| n := bigN.Int64() + int64(min) | ||
|
|
||
| const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_=+<>?" | ||
|
|
||
| result := make([]byte, n) | ||
| for i := range result { | ||
| randomIndex, err := rand.Int(rand.Reader, big.NewInt(int64(len(charset)))) | ||
| if err != nil { | ||
| fmt.Println("❌ Unable to generate passphrase" + err.Error()) | ||
| } | ||
| result[i] = charset[randomIndex.Int64()] | ||
| } | ||
| fmt.Println("Passphrase: " + string(result)) | ||
| } |
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