加密

1. 獲取加密用16位元組key, 並檢視其值.

openssl rand 16 > enc.key

xxd enc.key 00000000: 598b a998 f204 f30c b900 4de6 7060 0b33 Y…M.p`.3

2. 獲取加密用iv並檢視其值.

openssl rand -hex 16 >enc.iv.txt xxd enc.iv.txt 00000000: 6139 6238 3031 3366 3830 3966 3334 6330 a9b8013f809f34c0 00000010: 3330 3839 3932 3066 6633 3461 6566 3765 3089920ff34aef7e 00000020: 0a .

cat enc.iv.txt a9b8013f809f34c03089920ff34aef7e

3. 生成hls_key_info_file. 其內容形式如

Key URI
Path to key file
IV (optional)

vim enc.keyinfo https://me.test.com/get_dk enc.key a9b8013f809f34c03089920ff34aef7e

4. 使用ffmpeg生成加密hls視訊

ffmpeg -y -i mp4_sample.mp4 -hls_key_info_file enc.keyinfo -hls_playlist_type vod -hls_segment_filename “fileSequence%d.ts” prog_index.m3u8

解密

1. 選擇 fileSequence0.ts 來解密

ls -a fileSequence*

2. 使用openssl 解密ts視訊. 這裡的iv, K都是加密時設定的.

openssl aes-128-cbc -d -in fileSequence0.ts -out fileSequence0_decrypto.ts -nosalt -iv a9b8013f809f34c03089920ff34aef7e -K 598ba998f204f30cb9004de670600b33

得到的fileSequence0_decrypto.ts即是解密視訊.