BRNSystems/meshcore-wch
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really still wip

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This commit is contained in:
Bruno Rybársky
2025-12-28 12:23:11 +01:00
parent a48ef9d5e0
commit 31dda62474
33 changed files with 1721 additions and 589 deletions
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31
User/lib/ed25519/ed_25519.h
View File

@@ -4,34 +4,21 @@
// Nightcracker's Ed25519 - https://github.com/orlp/ed25519
#include <stddef.h>
#if defined(_WIN32)
#if defined(ED25519_BUILD_DLL)
#define ED25519_DECLSPEC __declspec(dllexport)
#elif defined(ED25519_DLL)
#define ED25519_DECLSPEC __declspec(dllimport)
#else
#define ED25519_DECLSPEC
#endif
#else
#define ED25519_DECLSPEC
#endif
#include "meshcore/packetstructs.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifndef ED25519_NO_SEED
int ED25519_DECLSPEC ed25519_create_seed(unsigned char *seed);
#endif
void ED25519_DECLSPEC ed25519_create_keypair(unsigned char *public_key, unsigned char *private_key, const unsigned char *seed);
void ED25519_DECLSPEC ed25519_derive_pub(unsigned char *public_key, const unsigned char *private_key);
void ED25519_DECLSPEC ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key, const unsigned char *private_key);
int ED25519_DECLSPEC ed25519_verify(const unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key);
void ED25519_DECLSPEC ed25519_add_scalar(unsigned char *public_key, unsigned char *private_key, const unsigned char *scalar);
void ED25519_DECLSPEC ed25519_key_exchange(unsigned char *shared_secret, const unsigned char *public_key, const unsigned char *private_key);
void ed25519_create_keypair(unsigned char *public_key, unsigned char *private_key, const unsigned char *seed);
void ed25519_derive_pub(unsigned char *public_key, const unsigned char *private_key);
void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key, const unsigned char *private_key);
void ed25519_sign_ad(FrameStruct *frame);
int ed25519_verify(const unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key);
int ed25519_verify_ad(const FrameStruct *frame);
void ed25519_add_scalar(unsigned char *public_key, unsigned char *private_key, const unsigned char *scalar);
void ed25519_key_exchange(unsigned char *shared_secret, const unsigned char *public_key, const unsigned char *private_key);
#ifdef __cplusplus

40
User/lib/ed25519/seed.c
View File

@@ -1,40 +0,0 @@
#include "ed_25519.h"
#ifndef ED25519_NO_SEED
#ifdef _WIN32
#include <windows.h>
#include <wincrypt.h>
#else
#include <stdio.h>
#endif
int ed25519_create_seed(unsigned char *seed) {
#ifdef _WIN32
HCRYPTPROV prov;
if (!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
return 1;
}
if (!CryptGenRandom(prov, 32, seed)) {
CryptReleaseContext(prov, 0);
return 1;
}
CryptReleaseContext(prov, 0);
#else
FILE *f = fopen("/dev/urandom", "rb");
if (f == NULL) {
return 1;
}
fread(seed, 1, 32, f);
fclose(f);
#endif
return 0;
}
#endif

33
User/lib/ed25519/sign.c
View File

@@ -1,4 +1,5 @@
#include "ed_25519.h"
#include "lib/config.h"
#include "sha512.h"
#include "ge.h"
#include "sc.h"
@@ -29,3 +30,35 @@ void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t
sc_reduce(hram);
sc_muladd(signature + 32, hram, private_key, r);
}
void ed25519_sign_ad(FrameStruct *frame) {
sha512_context hash;
unsigned char hram[64];
unsigned char r[64];
ge_p3 R;
unsigned char *signature = &(frame->payload[36]);
sha512_init(&hash);
sha512_update(&hash, persistent.privkey + 32, 32);
sha512_update(&hash, frame->payload, 32);
sha512_update(&hash, frame->payload, 36); // pubkey and timestamp combined (32 bytes pubkey, 4 bytes timestamp)
sha512_update(&hash, &(frame->payload[100]), frame->payloadLen - 100);
sha512_final(&hash, r);
sc_reduce(r);
ge_scalarmult_base(&R, r);
ge_p3_tobytes(signature, &R);
sha512_init(&hash);
sha512_update(&hash, signature, 32);
sha512_update(&hash, frame->payload, 32);
sha512_update(&hash, frame->payload, 36); // pubkey and timestamp combined (32 bytes pubkey, 4 bytes timestamp)
sha512_update(&hash, &(frame->payload[100]), frame->payloadLen - 100);
sha512_final(&hash, hram);
sc_reduce(hram);
sc_muladd(signature + 32, hram, persistent.privkey, r);
}

35
User/lib/ed25519/verify.c
View File

@@ -75,3 +75,38 @@ int ed25519_verify(const unsigned char *signature, const unsigned char *message,
return 1;
}
int ed25519_verify_ad(const FrameStruct *frame) {
unsigned char h[64];
unsigned char checker[32];
sha512_context hash;
ge_p3 A;
ge_p2 R;
const unsigned char *signature = &(frame->payload[36]);
if (signature[63] & 224) {
return 0;
}
if (ge_frombytes_negate_vartime(&A, frame->payload) != 0) { //pubkey is at start
return 0;
}
sha512_init(&hash);
sha512_update(&hash, signature, 32);
sha512_update(&hash, frame->payload, 32);
sha512_update(&hash, frame->payload, 36); // pubkey and timestamp combined (32 bytes pubkey, 4 bytes timestamp)
sha512_update(&hash, &(frame->payload[100]), frame->payloadLen - 100);
sha512_final(&hash, h);
sc_reduce(h);
ge_double_scalarmult_vartime(&R, h, &A, signature + 32);
ge_tobytes(checker, &R);
if (!consttime_equal(checker, signature)) {
return 0;
}
return 1;
}