mirror of
https://github.com/ElementsProject/lightning.git
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25a37fafae
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
#include "privkey.h"
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#include "pubkey.h"
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#include "type_to_string.h"
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#include "utils.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 <ccan/structeq/structeq.h>
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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_DER_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_DER_LEN], const struct pubkey *key)
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{
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size_t outlen = PUBKEY_DER_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_DER_LEN);
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}
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/* Pubkey from privkey */
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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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if (!secp256k1_ec_pubkey_create(secp256k1_ctx,
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&key->pubkey, privkey->secret))
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return false;
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return true;
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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_DER_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_DER_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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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_DER_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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bool pubkey_eq(const struct pubkey *a, const struct pubkey *b)
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{
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return structeq(&a->pubkey, &b->pubkey);
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}
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REGISTER_TYPE_TO_STRING(pubkey, 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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static char *privkey_to_hexstr(const tal_t *ctx, const struct privkey *secret)
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{
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/* Bitcoin appends "01" to indicate the pubkey is compressed. */
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char *str = tal_arr(ctx, char, hex_str_size(sizeof(*secret) + 1));
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hex_encode(secret, sizeof(*secret), str, hex_str_size(sizeof(*secret)));
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strcat(str, "01");
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return str;
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}
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REGISTER_TYPE_TO_STRING(privkey, privkey_to_hexstr);
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