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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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7
src/testrand_impl.h
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@@ -22,12 +22,13 @@ SECP256K1_INLINE static void testrand_seed(const unsigned char *seed16) {
unsigned char out32[32];
secp256k1_sha256 hash;
int i;
const secp256k1_hash_ctx *hash_ctx = secp256k1_get_hash_context(secp256k1_context_static);
/* Use SHA256(PREFIX || seed16) as initial state. */
secp256k1_sha256_initialize(&hash);
secp256k1_sha256_write(&hash, PREFIX, sizeof(PREFIX));
secp256k1_sha256_write(&hash, seed16, 16);
secp256k1_sha256_finalize(&hash, out32);
secp256k1_sha256_write(hash_ctx, &hash, PREFIX, sizeof(PREFIX));
secp256k1_sha256_write(hash_ctx, &hash, seed16, 16);
secp256k1_sha256_finalize(hash_ctx, &hash, out32);
for (i = 0; i < 4; ++i) {
uint64_t s = 0;
int j;