mirror of
https://github.com/dpup/meshstream.git
synced 2026-03-28 17:42:37 +01:00
97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
package decoder
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import (
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"encoding/base64"
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"fmt"
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"sync"
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)
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// DefaultPrivateKey is the key used by pseudo public channels
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const DefaultPrivateKey = "1PG7OiApB1nwvP+rz05pAQ=="
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// ChannelKeys maps channelId to privateKey
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var channelKeys = make(map[string][]byte)
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var channelKeysMutex sync.RWMutex
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// AddChannelKey adds a new channel key to the map
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func AddChannelKey(channelId, base64Key string) error {
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key, err := base64.StdEncoding.DecodeString(base64Key)
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if err != nil {
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return fmt.Errorf("invalid base64 key: %v", err)
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}
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// Ensure the key is properly padded to be a valid AES key length
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key = PadKey(key)
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channelKeysMutex.Lock()
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defer channelKeysMutex.Unlock()
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channelKeys[channelId] = key
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return nil
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}
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// GetChannelKey retrieves a channel key from the map, or returns the default key if not found
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func GetChannelKey(channelId string) []byte {
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channelKeysMutex.RLock()
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defer channelKeysMutex.RUnlock()
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if key, ok := channelKeys[channelId]; ok {
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return key
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}
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// Return the default key if no specific key is found
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defaultKey, _ := base64.StdEncoding.DecodeString(DefaultPrivateKey)
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return PadKey(defaultKey)
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}
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// ClearChannelKeys removes all channel keys
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func ClearChannelKeys() {
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channelKeysMutex.Lock()
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defer channelKeysMutex.Unlock()
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channelKeys = make(map[string][]byte)
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}
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// ListChannelKeys returns a map of all channel IDs and their keys (base64 encoded)
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func ListChannelKeys() map[string]string {
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channelKeysMutex.RLock()
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defer channelKeysMutex.RUnlock()
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result := make(map[string]string)
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for id, key := range channelKeys {
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result[id] = base64.StdEncoding.EncodeToString(key)
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}
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return result
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}
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// RemoveChannelKey removes a channel key from the map
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func RemoveChannelKey(channelId string) {
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channelKeysMutex.Lock()
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defer channelKeysMutex.Unlock()
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delete(channelKeys, channelId)
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}
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// PadKey ensures the key is properly padded to be a valid AES key length (16, 24, or 32 bytes)
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func PadKey(key []byte) []byte {
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// If key length is already valid, return as is
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if len(key) == 16 || len(key) == 24 || len(key) == 32 {
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return key
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}
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// Pad to the next valid AES key length
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if len(key) < 16 {
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paddedKey := make([]byte, 16)
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copy(paddedKey, key)
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return paddedKey
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} else if len(key) < 24 {
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paddedKey := make([]byte, 24)
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copy(paddedKey, key)
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return paddedKey
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} else {
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paddedKey := make([]byte, 32)
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copy(paddedKey, key)
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return paddedKey
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}
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}
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