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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33
User/lib/ed25519/sign.c
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@@ -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);
}