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sha256: Add primitive to add a varint-encoded int to a hash

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We're about to push a couple of varints as part of the dynafed blockparsing,
so we might as well make it easier for us.
This commit is contained in:
Christian Decker
2020-01-23 15:06:02 +01:00
parent 4de0d1ca22
commit 8839be641a
1 changed files with 9 additions and 4 deletions
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13
bitcoin/block.c
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@@ -4,6 +4,14 @@
#include <ccan/str/hex/hex.h>
#include <common/type_to_string.h>
static void sha256_varint(struct sha256_ctx *ctx, u64 val)
{
u8 vt[VARINT_MAX_LEN];
size_t vtlen;
vtlen = varint_put(vt, val);
sha256_update(ctx, vt, vtlen);
}
/* Encoding is <blockhdr> <varint-num-txs> <tx>... */
struct bitcoin_block *
bitcoin_block_from_hex(const tal_t *ctx, const struct chainparams *chainparams,
@@ -81,8 +89,6 @@ void bitcoin_block_blkid(const struct bitcoin_block *b,
struct bitcoin_blkid *out)
{
struct sha256_ctx shactx;
u8 vt[VARINT_MAX_LEN];
size_t vtlen;
sha256_init(&shactx);
sha256_le32(&shactx, b->hdr.version);
@@ -94,8 +100,7 @@ void bitcoin_block_blkid(const struct bitcoin_block *b,
size_t clen = tal_bytelen(b->elements_hdr->proof.challenge);
sha256_le32(&shactx, b->elements_hdr->block_height);
vtlen = varint_put(vt, clen);
sha256_update(&shactx, vt, vtlen);
sha256_varint(&shactx, clen);
sha256_update(&shactx, b->elements_hdr->proof.challenge, clen);
/* The solution is skipped, since that'd create a circular
* dependency apparently */