Function compute_blinding_factor

common/sphinx.c:343–357

}

static void compute_blinding_factor(const struct pubkey *key,
				    const struct secret *sharedsecret,
				    u8 res[BLINDING_FACTOR_SIZE])
{
	struct sha256_ctx ctx;
	u8 der[PUBKEY_CMPR_LEN];
	struct sha256 temp;

	pubkey_to_der(der, key);
	sha256_init(&ctx);
	sha256_update(&ctx, der, sizeof(der));
	sha256_update(&ctx, sharedsecret->data, sizeof(sharedsecret->data));
	sha256_done(&ctx, &temp);
	memcpy(res, &temp, 32);
}

static bool blind_group_element(struct pubkey *blindedelement,
				const struct pubkey *pubkey,