69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
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package uploader
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"crypto/sha512"
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"encoding/hex"
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"fmt"
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"io"
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)
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func generateEncryptionKey() ([]byte, error) {
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key := make([]byte, 32) // AES-256 32-byte key
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if _, err := rand.Read(key); err != nil {
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return nil, err
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}
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return key, nil
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}
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func encryptData(data []byte, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return nil, err
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}
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return gcm.Seal(nonce, nonce, data, nil), nil
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}
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func decryptData(encryptedData []byte, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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nonceSize := gcm.NonceSize()
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if len(encryptedData) < nonceSize {
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return nil, fmt.Errorf("encrypted data is too short")
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}
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nonce, ciphertext := encryptedData[:nonceSize], encryptedData[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return nil, err
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}
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return plaintext, nil
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}
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func hashKey(key []byte) string {
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hash := sha512.Sum512(key)
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return hex.EncodeToString(hash[:])
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}
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