lacte::vnc::des Namespace Reference

Namespaces
namespace	detail

Functions
auto	encrypt_block (const std::uint64_t plaintext, const std::uint64_t key64) -> std::uint64_t
	Encrypts one 64-bit block with one 64-bit DES key (parity bits included but unchecked - PC1 drops them exactly as the algorithm always does).
auto	bytes_to_u64 (const std::array< std::uint8_t, 8 > &bytes) -> std::uint64_t
auto	u64_to_bytes (const std::uint64_t value) -> std::array< std::uint8_t, 8 >
auto	vnc_encrypt_challenge (const std::array< std::uint8_t, 16 > &challenge, const std::string &password) -> std::array< std::uint8_t, 16 >
	RFB's classic "VNC Authentication" (security type 2) challenge response: the connection password becomes an 8-byte DES key (truncated to 8 bytes / zero-padded if shorter - a real, well-known VNC password length limit, not a bug), with each key BYTE's bits reversed before use.

Function Documentation

bytes_to_u64()

auto lacte::vnc::des::bytes_to_u64 ( const std::array< std::uint8_t, 8 > & bytes ) -> std::uint64_t

inline

Definition at line 190 of file Des.hpp.

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encrypt_block()

auto lacte::vnc::des::encrypt_block ( const std::uint64_t plaintext, const std::uint64_t key64 ) -> std::uint64_t

inlinenodiscard

Encrypts one 64-bit block with one 64-bit DES key (parity bits included but unchecked - PC1 drops them exactly as the algorithm always does).

Verified against the classic FIPS PUB 46 worked example in des_test.cpp; do not "simplify" the bit numbering here without re-checking against that vector - DES's MSB-first, 1-indexed table convention is easy to get silently backwards.

Definition at line 169 of file Des.hpp.

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u64_to_bytes()

auto lacte::vnc::des::u64_to_bytes ( const std::uint64_t value ) -> std::array< std::uint8_t, 8 >

inline

Definition at line 199 of file Des.hpp.

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vnc_encrypt_challenge()

auto lacte::vnc::des::vnc_encrypt_challenge ( const std::array< std::uint8_t, 16 > & challenge, const std::string & password ) -> std::array< std::uint8_t, 16 >

inlinenodiscard

RFB's classic "VNC Authentication" (security type 2) challenge response: the connection password becomes an 8-byte DES key (truncated to 8 bytes / zero-padded if shorter - a real, well-known VNC password length limit, not a bug), with each key BYTE's bits reversed before use.

• a historical quirk of the original AT&T/Olivetti VNC implementation that every RFB-compliant client and server has replicated ever since (see e.g. TigerVNC's/RealVNC's own d3des.c). The 16-byte challenge is then encrypted as two INDEPENDENT 8-byte ECB blocks (no chaining between them) with that key.

Definition at line 228 of file Des.hpp.

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