109 lines
2.8 KiB
Go
109 lines
2.8 KiB
Go
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// Package encryption provides functions to encode/decode AES encrypted secrets.
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//
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// Encryption is used to store sensitive information in the database, such as 2FA TOTP secrets
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// for users who have 2FA authentication enabled.
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//
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// For new key generation, see pkg/config/variable.go#NewAESKey.
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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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"crypto/sha256"
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"errors"
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"fmt"
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"io"
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"code.nonshy.com/nonshy/website/pkg/config"
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)
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// Encrypt a byte stream using the site's AES passphrase.
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func Encrypt(input []byte) ([]byte, error) {
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if len(config.Current.Encryption.AESKey) == 0 {
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return nil, errors.New("AES key not configured")
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}
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// Generate a new AES cipher.
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c, err := aes.NewCipher(config.Current.Encryption.AESKey)
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if err != nil {
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return nil, err
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}
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// gcm or Galois/Counter Mode
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gcm, err := cipher.NewGCM(c)
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if err != nil {
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return nil, err
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}
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// Create a new byte array the size of the GCM nonce
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// which must be passed to Seal.
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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, fmt.Errorf("populating the nonce: %s", err)
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}
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// Encrypt the text using the Seal function.
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// Seal encrypts and authenticates plaintext, authenticates the
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// additional data and appends the result to dst, returning the
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// updated slice. The nonce must be NonceSize() bytes long and
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// unique for all time, for a given key.
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result := gcm.Seal(nonce, nonce, input, nil)
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return result, nil
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}
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// EncryptString encrypts a string value and returns the cipher text.
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func EncryptString(input string) ([]byte, error) {
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return Encrypt([]byte(input))
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}
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// Decrypt a byte stream using the site's AES passphrase.
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func Decrypt(data []byte) ([]byte, error) {
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if len(config.Current.Encryption.AESKey) == 0 {
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return nil, errors.New("AES key not configured")
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}
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c, err := aes.NewCipher(config.Current.Encryption.AESKey)
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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(c)
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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(data) < nonceSize {
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return nil, errors.New("ciphertext data less than nonceSize")
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}
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nonce, ciphertext := data[:nonceSize], data[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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// DecryptString decrypts a string value from ciphertext.
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func DecryptString(data []byte) (string, error) {
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decoded, err := Decrypt(data)
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if err != nil {
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return "", err
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}
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return string(decoded), nil
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}
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// Hash a byte array as SHA256 and returns the hex string.
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func Hash(input []byte) string {
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h := sha256.New()
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h.Write(input)
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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// VerifyHash hashes a byte array and checks the result.
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func VerifyHash(input []byte, expect string) bool {
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return Hash(input) == expect
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}
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