之前使用C语言实现了一次，见M3U8数据流ts的AES-128解密并合并。

学习了Go语言后，又用Go重新实现了一遍。源码如下，无第三方库依赖。

package mainimport ("crypto/aes""crypto/cipher""encoding/binary""fmt""io""os""strconv"
)func decodeAES128CBC(key []byte, index int, inFile string, out io.Writer) error {block, err := aes.NewCipher(key)if err != nil {return err}inBuf, err := os.ReadFile(inFile)if err != nil || len(inBuf) == 0 {return err}var iv [16]bytebinary.BigEndian.PutUint32(iv[12:], uint32(index))outBuf := make([]byte, len(inBuf))mode := cipher.NewCBCDecrypter(block, iv[:])mode.CryptBlocks(outBuf, inBuf)pad := int(outBuf[len(outBuf)-1])_, err = out.Write(outBuf[:len(outBuf)-pad])return err
}func decodeAesM3u8(key, inPath, outFile string) (int, error) {out, err := os.Create(outFile)if err != nil {return 0, err}defer out.Close()for i := 0; ; i++ {err = decodeAES128CBC([]byte(key), i, inPath+strconv.Itoa(i), out)if err != nil {if i == 0 {return 0, err}return i, nil}}
}func mergeM3u8(inPath, outFile string) (int, error) {out, err := os.Create(outFile)if err != nil {return 0, err}defer out.Close()for i := 0; ; i++ {in, err := os.Open(inPath + strconv.Itoa(i))if err != nil {if i == 0 {return 0, err}return i, nil}_, err = io.Copy(out, in)if err != nil {_ = in.Close()return i, err}err = in.Close()if err != nil {return i, err}}
}func main() {inPath, key, outFile := os.Args[1], os.Args[2], os.Args[3]var n intvar err errorif len(key) == 16 {n, err = decodeAesM3u8(key, inPath, outFile)} else {n, err = mergeM3u8(inPath, outFile)}if err != nil {fmt.Println(err)return}fmt.Println("successfully converted", n, "files")
}