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Avoid a sha256/ripemd160 call for each pubkey we derive

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We only take the pubkey and ignore all other fields, so we might as well
save the cycles used computing the hash for something else.

Signed-off-by: Jon Griffiths <jon_p_griffiths@yahoo.com>
This commit is contained in:
Jon Griffiths 2018-10-31 08:44:48 +13:00 committed by Rusty Russell
parent 087ef43a0d
commit 47743a287c
1 changed files with 2 additions and 2 deletions
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4
common/key_derive.c
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@ -248,13 +248,13 @@ bool derive_revocation_privkey(const struct secret *base_secret,
bool bip32_pubkey(const struct ext_key *bip32_base,
struct pubkey *pubkey, u32 index)
{
const uint32_t flags = BIP32_FLAG_KEY_PUBLIC | BIP32_FLAG_SKIP_HASH;
struct ext_key ext;
if (index >= BIP32_INITIAL_HARDENED_CHILD)
return false;
if (bip32_key_from_parent(bip32_base, index,
BIP32_FLAG_KEY_PUBLIC, &ext) != WALLY_OK)
if (bip32_key_from_parent(bip32_base, index, flags, &ext) != WALLY_OK)
return false;
if (!secp256k1_ec_pubkey_parse(secp256k1_ctx, &pubkey->pubkey,