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secp256k1
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add static context object which has no capabilities

This commit is contained in:
Andrew Poelstra 2018-08-15 21:27:25 +00:00
parent 1e6f1f5ad5
commit ed7c08417a
3 changed files with 16 additions and 0 deletions
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7
include/secp256k1.h
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@ -179,6 +179,13 @@ typedef int (*secp256k1_nonce_function)(
#define SECP256K1_TAG_PUBKEY_HYBRID_EVEN 0x06
#define SECP256K1_TAG_PUBKEY_HYBRID_ODD 0x07
/** A simple secp256k1 context object with no precomputed tables. These are useful for
* type serialization/parsing functions which require a context object to maintain
* API consistency, but currently do not require expensive precomputations or dynamic
* allocations.
*/
SECP256K1_API extern const secp256k1_context *secp256k1_context_no_precomp;
/** Create a secp256k1 context object.
*
* Returns: a newly created context object.

8
src/secp256k1.c
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@ -56,6 +56,14 @@ struct secp256k1_context_struct {
secp256k1_callback error_callback;
};
static const secp256k1_context secp256k1_context_no_precomp_ = {
{ 0 },
{ 0 },
{ default_illegal_callback_fn, 0 },
{ default_error_callback_fn, 0 }
};
const secp256k1_context *secp256k1_context_no_precomp = &secp256k1_context_no_precomp_;
secp256k1_context* secp256k1_context_create(unsigned int flags) {
secp256k1_context* ret = (secp256k1_context*)checked_malloc(&default_error_callback, sizeof(secp256k1_context));
ret->illegal_callback = default_illegal_callback;

1
src/tests.c
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@ -3599,6 +3599,7 @@ void run_ec_pubkey_parse_test(void) {
ecount = 0;
VG_UNDEF(&pubkey, sizeof(pubkey));
CHECK(secp256k1_ec_pubkey_parse(ctx, &pubkey, pubkeyc, 65) == 1);
CHECK(secp256k1_ec_pubkey_parse(secp256k1_context_no_precomp, &pubkey, pubkeyc, 65) == 1);
VG_CHECK(&pubkey, sizeof(pubkey));
CHECK(ecount == 0);
VG_UNDEF(&ge, sizeof(ge));