core-lightning/bitcoin/privkey.c

#include "privkey.h"
#include <assert.h>
#include <ccan/mem/mem.h>
#include <ccan/str/hex/hex.h>
#include <common/type_to_string.h>
#include <wire/wire.h>

static char *privkey_to_hexstr(const tal_t *ctx, const struct privkey *secret)
{
	/* Bitcoin appends "01" to indicate the pubkey is compressed. */
	char *str = tal_arr(ctx, char, hex_str_size(sizeof(*secret) + 1));
	hex_encode(secret, sizeof(*secret), str, hex_str_size(sizeof(*secret)));
	strcat(str, "01");
	return str;
}
REGISTER_TYPE_TO_STRING(privkey, privkey_to_hexstr);
REGISTER_TYPE_TO_HEXSTR(secret);

bool secret_eq_consttime(const struct secret *a, const struct secret *b)
{
	u8 result = 0;
	for (size_t i = 0; i < sizeof(a->data); i++)
		result |= a->data[i] ^ b->data[i];
	return result == 0;
}

void towire_privkey(u8 **pptr, const struct privkey *privkey)
{
	towire_secret(pptr, &privkey->secret);
}

void towire_secret(u8 **pptr, const struct secret *secret)
{
	towire(pptr, secret->data, sizeof(secret->data));
}

void fromwire_secret(const u8 **cursor, size_t *max, struct secret *secret)
{
	fromwire(cursor, max, secret->data, sizeof(secret->data));
}

void fromwire_privkey(const u8 **cursor, size_t *max, struct privkey *privkey)
{
	fromwire_secret(cursor, max, &privkey->secret);
}