ssh_kexhash.h File Reference

One key-exchange digest that dispatches SHA-256 or SHA-512 by the negotiated method. More...

#include "protocore_config.h"

Go to the source code of this file.

Classes
struct	SshKexHashInitArgs
	Which of the two KEX hashes the negotiated method binds a digest to. More...
struct	SshKexHashUpdateArgs
	The bytes absorbed. More...
struct	SshKexHashFinalArgs
	Where the digest lands. More...
struct	SshKexHashVars
struct	SshKexHashNs
	The entries. More...

Macros
#define	SSH_KEXHASH_MAX_LEN   64
	Longest exchange hash / session_id the two KEX hashes produce (SHA-512).

Functions
void	protocore_ssh_kex_hash_init (uint8_t *work)
void	protocore_ssh_kex_hash_update (uint8_t *work)
void	protocore_ssh_kex_hash_final (uint8_t *work)

Variables
SshKexHashVars	SshKexHashV
	The operands and the outcome.

Detailed Description

One key-exchange digest that dispatches SHA-256 or SHA-512 by the negotiated method.

RFC 4253 sec 8 ties the exchange hash H (and the sec 7.2 key derivation) to the KEX method's hash: the -sha256 methods (curve25519-sha256, ecdh-sha2-nistp256, dh-group14-sha256, mlkem768x25519-sha256) use SHA-256; -sha512 methods (sntru.nosp@m.p761.nosp@m.x2551.nosp@m.9-sh.nosp@m.a512@.nosp@m.open.nosp@m.ssh.c.nosp@m.om) use SHA-512. Rather than fork every hash site, the exchange hash and the KDF run through this one namespace, so adding a KEX with a different hash is a one-line change and not a new code path.

Author

Douglas Quigg (dstroy0)

Date

2026

Definition in file ssh_kexhash.h.

Macro Definition Documentation

SSH_KEXHASH_MAX_LEN

#define SSH_KEXHASH_MAX_LEN   64

Longest exchange hash / session_id the two KEX hashes produce (SHA-512).

Definition at line 26 of file ssh_kexhash.h.

Function Documentation

protocore_ssh_kex_hash_init()

void protocore_ssh_kex_hash_init

(

uint8_t *

work

)

protocore_ssh_kex_hash_update()

void protocore_ssh_kex_hash_update

(

uint8_t *

work

)

protocore_ssh_kex_hash_final()

void protocore_ssh_kex_hash_final

(

uint8_t *

work

)

Variable Documentation

SshKexHashV

SshKexHashVars SshKexHashV

extern

The operands and the outcome.