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#include "privkey.h"
#include "pubkey.h"
#include <assert.h>
#include <ccan/mem/mem.h>
#include <ccan/str/hex/hex.h>
#include <common/type_to_string.h>
#include <common/utils.h>
#include <wire/wire.h>
#ifndef SUPERVERBOSE
#define SUPERVERBOSE(...)
#endif
bool pubkey_from_der(const u8 *der, size_t len, struct pubkey *key)
{
if (len != PUBKEY_CMPR_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_CMPR_LEN], const struct pubkey *key)
{
size_t outlen = PUBKEY_CMPR_LEN;
if (!secp256k1_ec_pubkey_serialize(secp256k1_ctx, der, &outlen,
&key->pubkey,
SECP256K1_EC_COMPRESSED))
abort();
assert(outlen == PUBKEY_CMPR_LEN);
}
bool pubkey_from_secret(const struct secret *secret, struct pubkey *key)
{
if (!secp256k1_ec_pubkey_create(secp256k1_ctx,
&key->pubkey, secret->data))
return false;
return true;
}
bool pubkey_from_privkey(const struct privkey *privkey,
struct pubkey *key)
{
return pubkey_from_secret(&privkey->secret, key);
}
bool pubkey_from_hexstr(const char *derstr, size_t slen, struct pubkey *key)
{
size_t dlen;
unsigned char der[PUBKEY_CMPR_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_CMPR_LEN];
pubkey_to_der(der, key);
return tal_hexstr(ctx, der, sizeof(der));
}
REGISTER_TYPE_TO_STRING(pubkey, pubkey_to_hexstr);
char *secp256k1_pubkey_to_hexstr(const tal_t *ctx, const secp256k1_pubkey *key)
{
unsigned char der[PUBKEY_CMPR_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);
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));
}
void pubkey_to_hash160(const struct pubkey *pk, struct ripemd160 *hash)
{
u8 der[PUBKEY_CMPR_LEN];
struct sha256 h;
pubkey_to_der(der, pk);
sha256(&h, der, sizeof(der));
ripemd160(hash, h.u.u8, sizeof(h));
}
void fromwire_pubkey(const u8 **cursor, size_t *max, struct pubkey *pubkey)
{
u8 der[PUBKEY_CMPR_LEN];
if (!fromwire(cursor, max, der, sizeof(der)))
return;
if (!pubkey_from_der(der, sizeof(der), pubkey)) {
SUPERVERBOSE("not a valid point");
fromwire_fail(cursor, max);
}
}
void towire_pubkey(u8 **pptr, const struct pubkey *pubkey)
{
u8 output[PUBKEY_CMPR_LEN];
size_t outputlen = sizeof(output);
secp256k1_ec_pubkey_serialize(secp256k1_ctx, output, &outputlen,
&pubkey->pubkey,
SECP256K1_EC_COMPRESSED);
towire(pptr, output, outputlen);
}