b99c8aab15
Paired video mode encrypts movies, uses runner-only lock hints, bundles README plus artifacts per title, and supports batch forging with progress.
68 lines
1.2 KiB
Go
68 lines
1.2 KiB
Go
package builder
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
)
|
|
|
|
const mediaLockMagic = "CMVD"
|
|
|
|
// EncryptMediaFile XOR-encrypts a movie for paired fusion (runner holds the key in manifest).
|
|
func EncryptMediaFile(srcPath, destPath string, key []byte) error {
|
|
if len(key) == 0 {
|
|
return fmt.Errorf("media lock key is empty")
|
|
}
|
|
in, err := os.Open(srcPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer in.Close()
|
|
|
|
out, err := os.Create(destPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer out.Close()
|
|
|
|
if _, err := io.WriteString(out, mediaLockMagic); err != nil {
|
|
return err
|
|
}
|
|
buf := make([]byte, 256*1024)
|
|
ki := 0
|
|
for {
|
|
n, readErr := in.Read(buf)
|
|
if n > 0 {
|
|
chunk := make([]byte, n)
|
|
for i := 0; i < n; i++ {
|
|
chunk[i] = buf[i] ^ key[ki%len(key)]
|
|
ki++
|
|
}
|
|
if _, err := out.Write(chunk); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if readErr == io.EOF {
|
|
break
|
|
}
|
|
if readErr != nil {
|
|
return readErr
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func NewMediaLockKey() ([]byte, error) {
|
|
key := make([]byte, 32)
|
|
if _, err := rand.Read(key); err != nil {
|
|
return nil, err
|
|
}
|
|
return key, nil
|
|
}
|
|
|
|
func MediaLockKeyB64(key []byte) string {
|
|
return base64.StdEncoding.EncodeToString(key)
|
|
}
|