Tronax
cb30223fd4
Initial project setup for a privacy-focused, self-hosted scheduling app: - Go backend with JWT auth, SQLite storage, and chi router - Calendar integrations via Google OAuth (FreeBusy), CalDAV, and ICS links - Public booking pages with configurable slots and booking requests - AES-256-GCM encryption for stored provider tokens - Vue 3 + TypeScript frontend with Vite, Pinia, and Vue Router - Docs, .gitignore, and .env.example for local development
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package crypto
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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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"encoding/base64"
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"errors"
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"io"
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)
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// Encrypt verschlüsselt plaintext mit AES-256-GCM (Key = SHA256(secret))
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// und liefert base64(nonce + ciphertext).
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func Encrypt(secret string, plaintext []byte) (string, error) {
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k := sha256.Sum256([]byte(secret))
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block, err := aes.NewCipher(k[:])
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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(block)
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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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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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sealed := gcm.Seal(nonce, nonce, plaintext, nil)
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return base64.StdEncoding.EncodeToString(sealed), nil
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}
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// Decrypt macht Encrypt rückgängig.
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func Decrypt(secret, s string) ([]byte, error) {
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data, err := base64.StdEncoding.DecodeString(s)
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if err != nil {
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return nil, err
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}
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k := sha256.Sum256([]byte(secret))
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block, err := aes.NewCipher(k[:])
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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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if len(data) < gcm.NonceSize() {
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return nil, errors.New("ciphertext zu kurz")
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}
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return gcm.Open(nil, data[:gcm.NonceSize()], data[gcm.NonceSize():], nil)
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}
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