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tests: refactor tagged hash tests

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Move the sha256_tag_test_internal function out of the musig module
into tests.c. This makes it available to other modules wishing to verify tagged
hashes without needing to duplicate the function.

Change the function signature to expect a const unsigned char and update
the tagged hash tests to use static const unsigned char character
arrays (where necessary).

Add a comment for each tag. This is done as a convenience for checking
the strings against the protocol specifications, where the tags are
normally specified as strings.

Update tests in the ellswift and schnorrsig modules to use the
sha256_tag_test_internal helper function.
This commit is contained in:
josibake
2025-08-15 09:37:29 +01:00
parent d599714147
commit 5153cf1c91
4 changed files with 36 additions and 30 deletions
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31
src/modules/musig/tests_impl.h
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@@ -548,40 +548,39 @@ static void musig_nonce_test(void) {
}
}
static void sha256_tag_test_internal(secp256k1_sha256 *sha_tagged, unsigned char *tag, size_t taglen) {
secp256k1_sha256 sha;
secp256k1_sha256_initialize_tagged(&sha, tag, taglen);
test_sha256_eq(&sha, sha_tagged);
}
/* Checks that the initialized tagged hashes have the expected
* state. */
static void sha256_tag_test(void) {
secp256k1_sha256 sha;
{
char tag[] = "KeyAgg list";
/* "KeyAgg list" */
static const unsigned char tag[] = {'K', 'e', 'y', 'A', 'g', 'g', ' ', 'l', 'i', 's', 't'};
secp256k1_musig_keyagglist_sha256(&sha);
sha256_tag_test_internal(&sha, (unsigned char*)tag, sizeof(tag) - 1);
test_sha256_tag_midstate(&sha, tag, sizeof(tag));
}
{
char tag[] = "KeyAgg coefficient";
/* "KeyAgg coefficient" */
static const unsigned char tag[] = {'K', 'e', 'y', 'A', 'g', 'g', ' ', 'c', 'o', 'e', 'f', 'f', 'i', 'c', 'i', 'e', 'n', 't'};
secp256k1_musig_keyaggcoef_sha256(&sha);
sha256_tag_test_internal(&sha, (unsigned char*)tag, sizeof(tag) - 1);
test_sha256_tag_midstate(&sha, tag, sizeof(tag));
}
{
unsigned char tag[] = "MuSig/aux";
/* "MuSig/aux" */
static const unsigned char tag[] = { 'M', 'u', 'S', 'i', 'g', '/', 'a', 'u', 'x' };
secp256k1_nonce_function_musig_sha256_tagged_aux(&sha);
sha256_tag_test_internal(&sha, (unsigned char*)tag, sizeof(tag) - 1);
test_sha256_tag_midstate(&sha, tag, sizeof(tag));
}
{
unsigned char tag[] = "MuSig/nonce";
/* "MuSig/nonce" */
static const unsigned char tag[] = { 'M', 'u', 'S', 'i', 'g', '/', 'n', 'o', 'n', 'c', 'e' };
secp256k1_nonce_function_musig_sha256_tagged(&sha);
sha256_tag_test_internal(&sha, (unsigned char*)tag, sizeof(tag) - 1);
test_sha256_tag_midstate(&sha, tag, sizeof(tag));
}
{
unsigned char tag[] = "MuSig/noncecoef";
/* "MuSig/noncecoef" */
static const unsigned char tag[] = { 'M', 'u', 'S', 'i', 'g', '/', 'n', 'o', 'n', 'c', 'e', 'c', 'o', 'e', 'f' };
secp256k1_musig_compute_noncehash_sha256_tagged(&sha);
sha256_tag_test_internal(&sha, (unsigned char*)tag, sizeof(tag) - 1);
test_sha256_tag_midstate(&sha, tag, sizeof(tag));
}
}