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introduce secp256k1_eckey_pubkey_serialize{33,65} functions

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Sebastian Falbesoner
2025-11-17 16:43:49 +01:00
parent c8206b1ce6
commit fc7458ca3e
2 changed files with 23 additions and 0 deletions
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4
src/eckey.h
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@@ -16,6 +16,10 @@
static int secp256k1_eckey_pubkey_parse(secp256k1_ge *elem, const unsigned char *pub, size_t size); static int secp256k1_eckey_pubkey_parse(secp256k1_ge *elem, const unsigned char *pub, size_t size);
static int secp256k1_eckey_pubkey_serialize(secp256k1_ge *elem, unsigned char *pub, size_t *size, int compressed); static int secp256k1_eckey_pubkey_serialize(secp256k1_ge *elem, unsigned char *pub, size_t *size, int compressed);
/** Serialize a group element (that is not allowed to be infinity) to a compressed public key (33 bytes). */
static void secp256k1_eckey_pubkey_serialize33(secp256k1_ge *elem, unsigned char *pub33);
/** Serialize a group element (that is not allowed to be infinity) to an uncompressed public key (65 bytes). */
static void secp256k1_eckey_pubkey_serialize65(secp256k1_ge *elem, unsigned char *pub65);
static int secp256k1_eckey_privkey_tweak_add(secp256k1_scalar *key, const secp256k1_scalar *tweak); static int secp256k1_eckey_privkey_tweak_add(secp256k1_scalar *key, const secp256k1_scalar *tweak);
static int secp256k1_eckey_pubkey_tweak_add(secp256k1_ge *key, const secp256k1_scalar *tweak); static int secp256k1_eckey_pubkey_tweak_add(secp256k1_ge *key, const secp256k1_scalar *tweak);

19
src/eckey_impl.h
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@@ -55,6 +55,25 @@ static int secp256k1_eckey_pubkey_serialize(secp256k1_ge *elem, unsigned char *p
return 1; return 1;
} }
static void secp256k1_eckey_pubkey_serialize33(secp256k1_ge *elem, unsigned char *pub33) {
VERIFY_CHECK(!secp256k1_ge_is_infinity(elem));
secp256k1_fe_normalize_var(&elem->x);
secp256k1_fe_normalize_var(&elem->y);
pub33[0] = secp256k1_fe_is_odd(&elem->y) ? SECP256K1_TAG_PUBKEY_ODD : SECP256K1_TAG_PUBKEY_EVEN;
secp256k1_fe_get_b32(&pub33[1], &elem->x);
}
static void secp256k1_eckey_pubkey_serialize65(secp256k1_ge *elem, unsigned char *pub65) {
VERIFY_CHECK(!secp256k1_ge_is_infinity(elem));
secp256k1_fe_normalize_var(&elem->x);
secp256k1_fe_normalize_var(&elem->y);
pub65[0] = SECP256K1_TAG_PUBKEY_UNCOMPRESSED;
secp256k1_fe_get_b32(&pub65[1], &elem->x);
secp256k1_fe_get_b32(&pub65[33], &elem->y);
}
static int secp256k1_eckey_privkey_tweak_add(secp256k1_scalar *key, const secp256k1_scalar *tweak) { static int secp256k1_eckey_privkey_tweak_add(secp256k1_scalar *key, const secp256k1_scalar *tweak) {
secp256k1_scalar_add(key, key, tweak); secp256k1_scalar_add(key, key, tweak);
return !secp256k1_scalar_is_zero(key); return !secp256k1_scalar_is_zero(key);