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81 lines
3 KiB
Rust
81 lines
3 KiB
Rust
use strum::{Display, EnumString};
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/// The encryption method.
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#[non_exhaustive]
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#[allow(missing_docs)]
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#[derive(Ord, PartialOrd, Debug, Clone, Copy, PartialEq, Eq, Hash, Display, EnumString)]
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#[strum(serialize_all = "SCREAMING-KEBAB-CASE")]
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pub enum EncryptionMethod {
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/// The [`MediaSegment`]s are completely encrypted using the Advanced
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/// Encryption Standard ([AES-128]) with a 128-bit key, Cipher Block
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/// Chaining (CBC), and [Public-Key Cryptography Standards #7 (PKCS7)]
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/// padding.
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///
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/// CBC is restarted on each segment boundary, using either the
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/// Initialization Vector (IV) or the Media Sequence Number as the IV
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///
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/// ```
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/// # let media_sequence_number = 5;
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/// # assert_eq!(
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/// format!("0x{:032x}", media_sequence_number)
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/// # , "0x00000000000000000000000000000005".to_string());
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/// ```
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///
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/// [`MediaSegment`]: crate::MediaSegment
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/// [AES-128]: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.197.pdf
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/// [Public-Key Cryptography Standards #7 (PKCS7)]: https://tools.ietf.org/html/rfc5652
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#[strum(serialize = "AES-128")]
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Aes128,
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/// The [`MediaSegment`]s contain media samples, such as audio or video,
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/// that are encrypted using the Advanced Encryption Standard ([`AES-128`]).
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///
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/// How these media streams are encrypted and encapsulated in a segment
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/// depends on the media encoding and the media format of the segment.
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///
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/// `fMP4` [`MediaSegment`]s are encrypted using the `cbcs` scheme of
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/// [Common Encryption].
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/// Encryption of other [`MediaSegment`] formats containing [H.264], [AAC],
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/// [AC-3], and Enhanced [AC-3] media streams is described in the
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/// [HTTP Live Streaming (HLS) SampleEncryption specification].
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///
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/// [`MediaSegment`]: crate::MediaSegment
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/// [`AES-128`]: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.197.pdf
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/// [Common Encryption]: https://tools.ietf.org/html/rfc8216#ref-COMMON_ENC
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/// [H.264]: https://tools.ietf.org/html/rfc8216#ref-H_264
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/// [AAC]: https://tools.ietf.org/html/rfc8216#ref-ISO_14496
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/// [AC-3]: https://tools.ietf.org/html/rfc8216#ref-AC_3
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/// [HTTP Live Streaming (HLS) SampleEncryption specification]:
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/// https://tools.ietf.org/html/rfc8216#ref-SampleEnc
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SampleAes,
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use pretty_assertions::assert_eq;
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#[test]
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fn test_display() {
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assert_eq!(EncryptionMethod::Aes128.to_string(), "AES-128".to_string());
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assert_eq!(
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EncryptionMethod::SampleAes.to_string(),
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"SAMPLE-AES".to_string()
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);
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}
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#[test]
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fn test_parser() {
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assert_eq!(
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EncryptionMethod::Aes128,
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"AES-128".parse::<EncryptionMethod>().unwrap()
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);
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assert_eq!(
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EncryptionMethod::SampleAes,
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"SAMPLE-AES".parse::<EncryptionMethod>().unwrap()
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);
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assert!("unknown".parse::<EncryptionMethod>().is_err());
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}
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}
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