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miniproto.crypto.mtproto.media_ctr_crypt

miniproto.crypto.mtproto.media_ctr_crypt

Section titled “miniproto.crypto.mtproto.media_ctr_crypt”
media_ctr_crypt(data: BytesLike, key: bytes, iv: bytes) -> bytes

Apply AES-256-CTR to CDN/media bytes.

Parameters:

  • data (BytesLike) – Bytes to encrypt or decrypt; CTR uses the same operation both ways.
  • key (bytes) – Exactly 32 bytes of AES-256 key material.
  • iv (bytes) – Exactly 16 bytes of counter/initialization value.

Returns:

  • bytes – Transformed bytes of the same length as data.

Raises:

  • ValueError – If the key or IV length is invalid.

Reusing a key/IV pair across distinct plaintexts is unsafe; this wrapper does not track nonce reuse. Dispatch can prefer the C-backed fallback when cryptography is installed for the benchmarked media path.

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Fast paths where they count. Explicit boundaries everywhere else.