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127 lines
3.0 KiB
127 lines
3.0 KiB
#include "privkey.h"
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#include "pubkey.h"
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#include <assert.h>
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#include <ccan/mem/mem.h>
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#include <ccan/str/hex/hex.h>
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#include <common/type_to_string.h>
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#include <common/utils.h>
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#include <wire/wire.h>
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#ifndef SUPERVERBOSE
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#define SUPERVERBOSE(...)
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#endif
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bool pubkey_from_der(const u8 *der, size_t len, struct pubkey *key)
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{
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if (len != PUBKEY_CMPR_LEN)
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return false;
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if (!secp256k1_ec_pubkey_parse(secp256k1_ctx, &key->pubkey,
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memcheck(der, len), len))
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return false;
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return true;
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}
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void pubkey_to_der(u8 der[PUBKEY_CMPR_LEN], const struct pubkey *key)
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{
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size_t outlen = PUBKEY_CMPR_LEN;
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if (!secp256k1_ec_pubkey_serialize(secp256k1_ctx, der, &outlen,
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&key->pubkey,
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SECP256K1_EC_COMPRESSED))
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abort();
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assert(outlen == PUBKEY_CMPR_LEN);
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}
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bool pubkey_from_secret(const struct secret *secret, struct pubkey *key)
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{
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if (!secp256k1_ec_pubkey_create(secp256k1_ctx,
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&key->pubkey, secret->data))
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return false;
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return true;
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}
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bool pubkey_from_privkey(const struct privkey *privkey,
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struct pubkey *key)
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{
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return pubkey_from_secret(&privkey->secret, key);
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}
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bool pubkey_from_hexstr(const char *derstr, size_t slen, struct pubkey *key)
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{
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size_t dlen;
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unsigned char der[PUBKEY_CMPR_LEN];
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dlen = hex_data_size(slen);
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if (dlen != sizeof(der))
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return false;
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if (!hex_decode(derstr, slen, der, dlen))
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return false;
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return pubkey_from_der(der, dlen, key);
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}
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char *pubkey_to_hexstr(const tal_t *ctx, const struct pubkey *key)
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{
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unsigned char der[PUBKEY_CMPR_LEN];
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pubkey_to_der(der, key);
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return tal_hexstr(ctx, der, sizeof(der));
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}
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REGISTER_TYPE_TO_STRING(pubkey, pubkey_to_hexstr);
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char *secp256k1_pubkey_to_hexstr(const tal_t *ctx, const secp256k1_pubkey *key)
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{
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unsigned char der[PUBKEY_CMPR_LEN];
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size_t outlen = sizeof(der);
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if (!secp256k1_ec_pubkey_serialize(secp256k1_ctx, der, &outlen, key,
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SECP256K1_EC_COMPRESSED))
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abort();
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assert(outlen == sizeof(der));
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return tal_hexstr(ctx, der, sizeof(der));
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}
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REGISTER_TYPE_TO_STRING(secp256k1_pubkey, secp256k1_pubkey_to_hexstr);
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int pubkey_cmp(const struct pubkey *a, const struct pubkey *b)
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{
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u8 keya[33], keyb[33];
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pubkey_to_der(keya, a);
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pubkey_to_der(keyb, b);
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return memcmp(keya, keyb, sizeof(keya));
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}
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void pubkey_to_hash160(const struct pubkey *pk, struct ripemd160 *hash)
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{
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u8 der[PUBKEY_CMPR_LEN];
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struct sha256 h;
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pubkey_to_der(der, pk);
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sha256(&h, der, sizeof(der));
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ripemd160(hash, h.u.u8, sizeof(h));
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}
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void fromwire_pubkey(const u8 **cursor, size_t *max, struct pubkey *pubkey)
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{
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u8 der[PUBKEY_CMPR_LEN];
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if (!fromwire(cursor, max, der, sizeof(der)))
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return;
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if (!pubkey_from_der(der, sizeof(der), pubkey)) {
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SUPERVERBOSE("not a valid point");
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fromwire_fail(cursor, max);
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}
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}
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void towire_pubkey(u8 **pptr, const struct pubkey *pubkey)
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{
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u8 output[PUBKEY_CMPR_LEN];
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size_t outputlen = sizeof(output);
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secp256k1_ec_pubkey_serialize(secp256k1_ctx, output, &outputlen,
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&pubkey->pubkey,
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SECP256K1_EC_COMPRESSED);
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towire(pptr, output, outputlen);
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}
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