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schnorrsig: allow signing and verification of variable length msgs

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Varlen message support for the default sign function comes from recommending
tagged_sha256. sign_custom on the other hand gets the ability to directly sign
message of any length. This also implies signing and verification support for
the empty message (NULL) with msglen 0.

Tests for variable lengths follow in a later commit.
This commit is contained in:
Jonas Nick
2021-01-15 21:19:34 +00:00
parent 5a8e4991ad
commit a0c3fc177f
5 changed files with 111 additions and 81 deletions
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8
src/bench_schnorrsig.c
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@@ -13,6 +13,8 @@
#include "util.h"
#include "bench.h"
#define MSGLEN 32
typedef struct {
secp256k1_context *ctx;
int n;
@@ -26,7 +28,7 @@ typedef struct {
void bench_schnorrsig_sign(void* arg, int iters) {
bench_schnorrsig_data *data = (bench_schnorrsig_data *)arg;
int i;
unsigned char msg[32] = "benchmarkexamplemessagetemplate";
unsigned char msg[MSGLEN] = "benchmarkexamplemessagetemplate";
unsigned char sig[64];
for (i = 0; i < iters; i++) {
@@ -43,7 +45,7 @@ void bench_schnorrsig_verify(void* arg, int iters) {
for (i = 0; i < iters; i++) {
secp256k1_xonly_pubkey pk;
CHECK(secp256k1_xonly_pubkey_parse(data->ctx, &pk, data->pk[i]) == 1);
CHECK(secp256k1_schnorrsig_verify(data->ctx, data->sigs[i], data->msgs[i], &pk));
CHECK(secp256k1_schnorrsig_verify(data->ctx, data->sigs[i], data->msgs[i], MSGLEN, &pk));
}
}
@@ -60,7 +62,7 @@ int main(void) {
for (i = 0; i < iters; i++) {
unsigned char sk[32];
unsigned char *msg = (unsigned char *)malloc(32);
unsigned char *msg = (unsigned char *)malloc(MSGLEN);
unsigned char *sig = (unsigned char *)malloc(64);
secp256k1_keypair *keypair = (secp256k1_keypair *)malloc(sizeof(*keypair));
unsigned char *pk_char = (unsigned char *)malloc(32);