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group: add ge_to_bytes and ge_from_bytes

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Jonas Nick
2024-01-06 15:53:30 +00:00
parent 1988855079
commit 85e224dd97
4 changed files with 50 additions and 14 deletions
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16
src/secp256k1.c
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@@ -238,25 +238,13 @@ static SECP256K1_INLINE void secp256k1_declassify(const secp256k1_context* ctx,
}
static int secp256k1_pubkey_load(const secp256k1_context* ctx, secp256k1_ge* ge, const secp256k1_pubkey* pubkey) {
secp256k1_ge_storage s;
/* We require that the secp256k1_ge_storage type is exactly 64 bytes.
* This is formally not guaranteed by the C standard, but should hold on any
* sane compiler in the real world. */
STATIC_ASSERT(sizeof(secp256k1_ge_storage) == 64);
memcpy(&s, &pubkey->data[0], 64);
secp256k1_ge_from_storage(ge, &s);
secp256k1_ge_from_bytes(ge, pubkey->data);
ARG_CHECK(!secp256k1_fe_is_zero(&ge->x));
return 1;
}
static void secp256k1_pubkey_save(secp256k1_pubkey* pubkey, secp256k1_ge* ge) {
secp256k1_ge_storage s;
STATIC_ASSERT(sizeof(secp256k1_ge_storage) == 64);
VERIFY_CHECK(!secp256k1_ge_is_infinity(ge));
secp256k1_ge_to_storage(&s, ge);
memcpy(&pubkey->data[0], &s, 64);
secp256k1_ge_to_bytes(pubkey->data, ge);
}
int secp256k1_ec_pubkey_parse(const secp256k1_context* ctx, secp256k1_pubkey* pubkey, const unsigned char *input, size_t inputlen) {