63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
package security
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
crand "crypto/rand"
|
|
"encoding/base64"
|
|
"io"
|
|
)
|
|
|
|
// Encrypt encrypts "data" with the specified "key" (must be valid 32 char AES key).
|
|
//
|
|
// This method uses AES-256-GCM block cypher mode.
|
|
func Encrypt(data []byte, key string) (string, error) {
|
|
block, err := aes.NewCipher([]byte(key))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
gcm, err := cipher.NewGCM(block)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
nonce := make([]byte, gcm.NonceSize())
|
|
|
|
// populates the nonce with a cryptographically secure random sequence
|
|
if _, err := io.ReadFull(crand.Reader, nonce); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
cipherByte := gcm.Seal(nonce, nonce, data, nil)
|
|
|
|
result := base64.StdEncoding.EncodeToString(cipherByte)
|
|
|
|
return result, nil
|
|
}
|
|
|
|
// Decrypt decrypts encrypted text with key (must be valid 32 chars AES key).
|
|
//
|
|
// This method uses AES-256-GCM block cypher mode.
|
|
func Decrypt(cipherText string, key string) ([]byte, error) {
|
|
block, err := aes.NewCipher([]byte(key))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
gcm, err := cipher.NewGCM(block)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
nonceSize := gcm.NonceSize()
|
|
|
|
cipherByte, err := base64.StdEncoding.DecodeString(cipherText)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
nonce, cipherByteClean := cipherByte[:nonceSize], cipherByte[nonceSize:]
|
|
return gcm.Open(nil, nonce, cipherByteClean, nil)
|
|
}
|