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Secure + VersionD Outbound Paddings Fix

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Alexey
2026-06-29 13:56:16 +03:00
parent 809352fac5
commit a0ac108807
7 changed files with 91 additions and 56 deletions
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src/protocol/framing.rs
+4 -4
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@@ -8,8 +8,8 @@ pub(crate) const INTERMEDIATE_QUICKACK_FLAG: u32 = 0x8000_0000;
/// Payload length mask used by Intermediate and Secure Intermediate headers.
pub(crate) const INTERMEDIATE_WIRE_LEN_MASK: u32 = 0x7fff_ffff;
/// Maximum random tail length used by Telegram Desktop VersionD packets.
pub(crate) const SECURE_VERSION_D_PADDING_MAX: usize = 15;
/// Maximum outbound Secure tail length that keeps wire lengths non-aligned.
pub(crate) const SECURE_VERSION_D_PADDING_MAX: usize = 3;
/// Parsed Intermediate/Secure Intermediate length header.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -51,9 +51,9 @@ pub(crate) fn secure_version_d_body_len_from_wire_len(wire_len: usize) -> Option
Some(wire_len - (wire_len % 4))
}
/// Generate Telegram Desktop-compatible VersionD random tail length.
/// Generate outbound Secure tail length without ambiguous full-word padding.
pub(crate) fn secure_version_d_padding_len(rng: &SecureRandom) -> usize {
rng.range(SECURE_VERSION_D_PADDING_MAX + 1)
rng.range(SECURE_VERSION_D_PADDING_MAX) + 1
}
#[cfg(test)]