Token Mechanism

A token is constructed as: {timestamp}-{signature}

timestamp: Unix timestamp in seconds
signature: MD5 of /{app}/{stream}-{timestamp}-{key}

Steps:

Concatenate the string to be encrypted using the following format: "/" + {app} + "/" + {stream} + "-" + {timestamp} + "-" + {key}
Use the MD5 algorithm to the concatenated string to generate the signature.

Form the token using the timestamp, hyphen and signature.

Example pseudocode:

private String md5Sum(String src) {
MessageDigest md5 = null;
try {
    md5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
}
md5.update(StandardCharsets.UTF_8.encode(src));
return String.format("%032x", new BigInteger(1, md5.digest()));
}
private String generateToken() {
    String key = "your key"; //secret key
    String app = "your app name"; //app name
    String stream = "your stream name"; //stream name
    long timestamp = 1730102840; //unix timestamp, seconds
    String toEncryptStr = String.format("/%s/%s-%s-%s", app, stream, timestamp, key);
    String signature = md5Sum(toEncryptStr);
    String token = String.format("%s-%s", timestamp , signature);
    return token;
}

Form RTMP ingest URL
The RTMP ingest URL is composed of the schema, ingest domain, app, stream name, and query parameters (including the token). Format:
```
rtmp://{ingest_domain}/{app}/{stream}?token={token}&{custom_parameters}=...
```