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Introduce hash context to support pluggable SHA256 compression

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This is purely a mechanical change with no behavior change.

It introduces a secp256k1_hash_ctx struct inside secp256k1_context
and propagates it to all SHA256-related operations.

This sets up the ability to provide a hardware-optimized SHA256
compression function at runtime in a follow-up commit.
This commit is contained in:
furszy
2025-12-17 11:15:33 -05:00
parent 95e6815843
commit fdb6a91a5e
21 changed files with 313 additions and 238 deletions
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8
src/bench_ecmult.c
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@@ -259,7 +259,7 @@ static void bench_ecmult_multi_teardown(void* arg, int iters) {
}
}
static void generate_scalar(uint32_t num, secp256k1_scalar* scalar) {
static void generate_scalar(const secp256k1_context *ctx, uint32_t num, secp256k1_scalar* scalar) {
secp256k1_sha256 sha256;
unsigned char c[10] = {'e', 'c', 'm', 'u', 'l', 't', 0, 0, 0, 0};
unsigned char buf[32];
@@ -269,8 +269,8 @@ static void generate_scalar(uint32_t num, secp256k1_scalar* scalar) {
c[8] = num >> 16;
c[9] = num >> 24;
secp256k1_sha256_initialize(&sha256);
secp256k1_sha256_write(&sha256, c, sizeof(c));
secp256k1_sha256_finalize(&sha256, buf);
secp256k1_sha256_write(secp256k1_get_hash_context(ctx), &sha256, c, sizeof(c));
secp256k1_sha256_finalize(secp256k1_get_hash_context(ctx), &sha256, buf);
secp256k1_scalar_set_b32(scalar, buf, &overflow);
CHECK(!overflow);
}
@@ -362,7 +362,7 @@ int main(int argc, char **argv) {
secp256k1_gej_set_ge(&data.pubkeys_gej[0], &secp256k1_ge_const_g);
secp256k1_scalar_set_int(&data.seckeys[0], 1);
for (i = 0; i < POINTS; ++i) {
generate_scalar(i, &data.scalars[i]);
generate_scalar(data.ctx, i, &data.scalars[i]);
if (i) {
secp256k1_gej_double_var(&data.pubkeys_gej[i], &data.pubkeys_gej[i - 1], NULL);
secp256k1_scalar_add(&data.seckeys[i], &data.seckeys[i - 1], &data.seckeys[i - 1]);