Encrypted HTTP Live Streaming

The HLS spec requires segments to be encrypted with AES-128 in CBC mode with PKCS7 padding. You can encrypt data to that specification with a combination of OpenSSL and the pkcs7 utility. From the command-line:

# encrypt the text "hello" into a file
echo -n "hello" | pkcs7 | openssl enc -aes-128-cbc > hello.encrypted

# encrypt some text and get the bytes in a format that can be easily used for
# testing in javascript
echo -n "hello" | pkcs7 | openssl enc -aes-128-cbc | xxd -i

Later, you can decrypt it:

cat hello.encrypted | openssl enc -d -aes-128-cbc