core-lightning/bitcoin/pubkey.c
Rusty Russell 25a37fafae type_to_string: add privkey.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2017-02-02 14:48:00 +10:30

101 lines
2.5 KiB
C

#include "privkey.h"
#include "pubkey.h"
#include "type_to_string.h"
#include "utils.h"
#include <assert.h>
#include <ccan/mem/mem.h>
#include <ccan/str/hex/hex.h>
#include <ccan/structeq/structeq.h>
bool pubkey_from_der(const u8 *der, size_t len, struct pubkey *key)
{
if (len != PUBKEY_DER_LEN)
return false;
if (!secp256k1_ec_pubkey_parse(secp256k1_ctx, &key->pubkey,
memcheck(der, len), len))
return false;
return true;
}
void pubkey_to_der(u8 der[PUBKEY_DER_LEN], const struct pubkey *key)
{
size_t outlen = PUBKEY_DER_LEN;
if (!secp256k1_ec_pubkey_serialize(secp256k1_ctx, der, &outlen,
&key->pubkey,
SECP256K1_EC_COMPRESSED))
abort();
assert(outlen == PUBKEY_DER_LEN);
}
/* Pubkey from privkey */
bool pubkey_from_privkey(const struct privkey *privkey,
struct pubkey *key)
{
if (!secp256k1_ec_pubkey_create(secp256k1_ctx,
&key->pubkey, privkey->secret))
return false;
return true;
}
bool pubkey_from_hexstr(const char *derstr, size_t slen, struct pubkey *key)
{
size_t dlen;
unsigned char der[PUBKEY_DER_LEN];
dlen = hex_data_size(slen);
if (dlen != sizeof(der))
return false;
if (!hex_decode(derstr, slen, der, dlen))
return false;
return pubkey_from_der(der, dlen, key);
}
char *pubkey_to_hexstr(const tal_t *ctx, const struct pubkey *key)
{
unsigned char der[PUBKEY_DER_LEN];
pubkey_to_der(der, key);
return tal_hexstr(ctx, der, sizeof(der));
}
char *secp256k1_pubkey_to_hexstr(const tal_t *ctx, const secp256k1_pubkey *key)
{
unsigned char der[PUBKEY_DER_LEN];
size_t outlen = sizeof(der);
if (!secp256k1_ec_pubkey_serialize(secp256k1_ctx, der, &outlen, key,
SECP256K1_EC_COMPRESSED))
abort();
assert(outlen == sizeof(der));
return tal_hexstr(ctx, der, sizeof(der));
}
REGISTER_TYPE_TO_STRING(secp256k1_pubkey, secp256k1_pubkey_to_hexstr);
bool pubkey_eq(const struct pubkey *a, const struct pubkey *b)
{
return structeq(&a->pubkey, &b->pubkey);
}
REGISTER_TYPE_TO_STRING(pubkey, pubkey_to_hexstr);
int pubkey_cmp(const struct pubkey *a, const struct pubkey *b)
{
u8 keya[33], keyb[33];
pubkey_to_der(keya, a);
pubkey_to_der(keyb, b);
return memcmp(keya, keyb, sizeof(keya));
}
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);