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Abstract out tweak logic to secp256k1_eckey_* functions

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This commit is contained in:
Pieter Wuille
2014-10-27 03:27:55 -07:00
parent ffffc87855
commit eb74c36bd2
3 changed files with 78 additions and 49 deletions
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55
src/eckey_impl.h
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@@ -131,4 +131,59 @@ int static secp256k1_eckey_privkey_serialize(unsigned char *privkey, int *privke
return 1;
}
int static secp256k1_eckey_privkey_tweak_add(secp256k1_num_t *key, const secp256k1_num_t *tweak) {
if (secp256k1_num_cmp(tweak, &secp256k1_ge_consts->order) >= 0)
return 0;
secp256k1_num_add(key, key, tweak);
secp256k1_num_mod(key, &secp256k1_ge_consts->order);
if (secp256k1_num_is_zero(key))
return 0;
return 1;
}
int static secp256k1_eckey_pubkey_tweak_add(secp256k1_ge_t *key, const secp256k1_num_t *tweak) {
if (secp256k1_num_cmp(tweak, &secp256k1_ge_consts->order) >= 0)
return 0;
secp256k1_gej_t pt;
secp256k1_gej_set_ge(&pt, key);
secp256k1_num_t one;
secp256k1_num_init(&one);
secp256k1_num_set_int(&one, 1);
secp256k1_ecmult(&pt, &pt, &one, tweak);
secp256k1_num_free(&one);
if (secp256k1_gej_is_infinity(&pt))
return 0;
secp256k1_ge_set_gej(key, &pt);
return 1;
}
int static secp256k1_eckey_privkey_tweak_mul(secp256k1_num_t *key, const secp256k1_num_t *tweak) {
if (secp256k1_num_is_zero(tweak))
return 0;
if (secp256k1_num_cmp(tweak, &secp256k1_ge_consts->order) >= 0)
return 0;
secp256k1_num_mod_mul(key, key, tweak, &secp256k1_ge_consts->order);
return 1;
}
int static secp256k1_eckey_pubkey_tweak_mul(secp256k1_ge_t *key, const secp256k1_num_t *tweak) {
if (secp256k1_num_is_zero(tweak))
return 0;
if (secp256k1_num_cmp(tweak, &secp256k1_ge_consts->order) >= 0)
return 0;
secp256k1_num_t zero;
secp256k1_num_init(&zero);
secp256k1_num_set_int(&zero, 0);
secp256k1_gej_t pt;
secp256k1_gej_set_ge(&pt, key);
secp256k1_ecmult(&pt, &pt, tweak, &zero);
secp256k1_num_free(&zero);
secp256k1_ge_set_gej(key, &pt);
return 1;
}
#endif