77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
package encryption
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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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"encoding/base64"
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"fmt"
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"github.com/fossyy/filekeeper/types"
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"github.com/fossyy/filekeeper/utils"
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)
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type aesEncryption struct{}
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func NewAesEncryption() types.Encryption {
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return &aesEncryption{}
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}
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func (e *aesEncryption) Encrypt(enc string) (string, error) {
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secret := utils.Getenv("ENCRYPTION_SECRET")
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aesCipher, err := aes.NewCipher([]byte(secret))
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(aesCipher)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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_, err = rand.Read(nonce)
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if err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nonce, nonce, []byte(enc), nil)
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ciphertextBase64 := base64.StdEncoding.EncodeToString(ciphertext)
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return ciphertextBase64, nil
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}
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func (e *aesEncryption) Decrypt(dec string) (string, error) {
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ciphertext, err := base64.StdEncoding.DecodeString(dec)
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if err != nil {
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return "", err
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}
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secret := utils.Getenv("ENCRYPTION_SECRET")
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if len(secret) != 16 && len(secret) != 24 && len(secret) != 32 {
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return "", fmt.Errorf("invalid SECRET length: must be 16, 24, or 32 bytes")
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}
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aesCipher, err := aes.NewCipher([]byte(secret))
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(aesCipher)
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if err != nil {
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return "", err
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}
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nonceSize := gcm.NonceSize()
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nonce, ciphertext := ciphertext[:nonceSize], ciphertext[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 "", fmt.Errorf("message authentication failed: %v", err)
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}
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return string(plaintext), nil
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}
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