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/**********************************************************************
* Copyright (c) 2013, 2014 Pieter Wuille *
* Distributed under the MIT software license, see the accompanying *
* file COPYING or http://www.opensource.org/licenses/mit-license.php.*
**********************************************************************/
#define SECP256K1_BUILD (1)
#include "include/secp256k1.h"
#include "util.h"
#include "num_impl.h"
#include "field_impl.h"
#include "scalar_impl.h"
#include "group_impl.h"
#include "ecmult_impl.h"
#include "ecmult_gen_impl.h"
#include "ecdsa_impl.h"
#include "eckey_impl.h"
#include "hash_impl.h"
void secp256k1_start(unsigned int flags) {
if (flags & SECP256K1_START_SIGN) {
secp256k1_ecmult_gen_start();
}
if (flags & SECP256K1_START_VERIFY) {
secp256k1_ecmult_start();
}
}
void secp256k1_stop(void) {
secp256k1_ecmult_stop();
secp256k1_ecmult_gen_stop();
}
int secp256k1_ecdsa_verify(const unsigned char *msg32, const unsigned char *sig, int siglen, const unsigned char *pubkey, int pubkeylen) {
secp256k1_ge_t q;
secp256k1_ecdsa_sig_t s;
secp256k1_scalar_t m;
DEBUG_CHECK(secp256k1_ecmult_consts != NULL);
DEBUG_CHECK(msg32 != NULL);
DEBUG_CHECK(sig != NULL);
DEBUG_CHECK(pubkey != NULL);
secp256k1_scalar_set_b32(&m, msg32, NULL);
if (!secp256k1_eckey_pubkey_parse(&q, pubkey, pubkeylen)) {
return -1;
}
if (!secp256k1_ecdsa_sig_parse(&s, sig, siglen)) {
return -2;
}
if (!secp256k1_ecdsa_sig_verify(&s, &q, &m)) {
return 0;
}
/* success is 1, all other values are fail */
return 1;
}
static int nonce_function_rfc6979(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, unsigned int counter, const void *data) {
secp256k1_rfc6979_hmac_sha256_t rng;
unsigned int i;
(void)data;
secp256k1_rfc6979_hmac_sha256_initialize(&rng, key32, 32, msg32, 32);
for (i = 0; i <= counter; i++) {
secp256k1_rfc6979_hmac_sha256_generate(&rng, nonce32, 32);
}
secp256k1_rfc6979_hmac_sha256_finalize(&rng);
return 1;
}
const secp256k1_nonce_function_t secp256k1_nonce_function_rfc6979 = nonce_function_rfc6979;
const secp256k1_nonce_function_t secp256k1_nonce_function_default = nonce_function_rfc6979;
int secp256k1_ecdsa_sign(const unsigned char *msg32, unsigned char *signature, int *signaturelen, const unsigned char *seckey, secp256k1_nonce_function_t noncefp, const void* noncedata) {
secp256k1_ecdsa_sig_t sig;
secp256k1_scalar_t sec, non, msg;
int ret = 0;
int overflow = 0;
unsigned int count = 0;
DEBUG_CHECK(secp256k1_ecmult_gen_consts != NULL);
DEBUG_CHECK(msg32 != NULL);
DEBUG_CHECK(signature != NULL);
DEBUG_CHECK(signaturelen != NULL);
DEBUG_CHECK(seckey != NULL);
if (noncefp == NULL) {
noncefp = secp256k1_nonce_function_default;
}
secp256k1_scalar_set_b32(&sec, seckey, &overflow);
if (overflow || secp256k1_scalar_is_zero(&sec)) {
*signaturelen = 0;
return 0;
}
secp256k1_scalar_set_b32(&msg, msg32, NULL);
while (1) {
unsigned char nonce32[32];
ret = noncefp(nonce32, msg32, seckey, count, noncedata);
if (!ret) {
break;
}
secp256k1_scalar_set_b32(&non, nonce32, &overflow);
memset(nonce32, 0, 32);
if (!secp256k1_scalar_is_zero(&non) && !overflow) {
if (secp256k1_ecdsa_sig_sign(&sig, &sec, &msg, &non, NULL)) {
break;
}
}
count++;
}
if (ret) {
ret = secp256k1_ecdsa_sig_serialize(signature, signaturelen, &sig);
}
if (!ret) {
*signaturelen = 0;
}
secp256k1_scalar_clear(&msg);
secp256k1_scalar_clear(&non);
secp256k1_scalar_clear(&sec);
return ret;
}
int secp256k1_ecdsa_sign_compact(const unsigned char *msg32, unsigned char *sig64, const unsigned char *seckey, secp256k1_nonce_function_t noncefp, const void* noncedata, int *recid) {
secp256k1_ecdsa_sig_t sig;
secp256k1_scalar_t sec, non, msg;
int ret = 0;
int overflow = 0;
unsigned int count = 0;
DEBUG_CHECK(secp256k1_ecmult_gen_consts != NULL);
DEBUG_CHECK(msg32 != NULL);
DEBUG_CHECK(sig64 != NULL);
DEBUG_CHECK(seckey != NULL);
if (noncefp == NULL) {
noncefp = secp256k1_nonce_function_default;
}
secp256k1_scalar_set_b32(&sec, seckey, &overflow);
if (overflow || secp256k1_scalar_is_zero(&sec)) {
memset(sig64, 0, 64);
return 0;
}
secp256k1_scalar_set_b32(&msg, msg32, NULL);
while (1) {
unsigned char nonce32[32];
ret = noncefp(nonce32, msg32, seckey, count, noncedata);
if (!ret) {
break;
}
secp256k1_scalar_set_b32(&non, nonce32, &overflow);
memset(nonce32, 0, 32);
if (!secp256k1_scalar_is_zero(&non) && !overflow) {
if (secp256k1_ecdsa_sig_sign(&sig, &sec, &msg, &non, recid)) {
break;
}
}
count++;
}
if (ret) {
secp256k1_scalar_get_b32(sig64, &sig.r);
secp256k1_scalar_get_b32(sig64 + 32, &sig.s);
}
if (!ret) {
memset(sig64, 0, 64);
}
secp256k1_scalar_clear(&msg);
secp256k1_scalar_clear(&non);
secp256k1_scalar_clear(&sec);
return ret;
}
int secp256k1_ecdsa_recover_compact(const unsigned char *msg32, const unsigned char *sig64, unsigned char *pubkey, int *pubkeylen, int compressed, int recid) {
secp256k1_ge_t q;
secp256k1_ecdsa_sig_t sig;
secp256k1_scalar_t m;
int ret = 0;
int overflow = 0;
DEBUG_CHECK(secp256k1_ecmult_consts != NULL);
DEBUG_CHECK(msg32 != NULL);
DEBUG_CHECK(sig64 != NULL);
DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(pubkeylen != NULL);
DEBUG_CHECK(recid >= 0 && recid <= 3);
secp256k1_scalar_set_b32(&sig.r, sig64, &overflow);
if (overflow) {
return 0;
}
secp256k1_scalar_set_b32(&sig.s, sig64 + 32, &overflow);
if (overflow) {
return 0;
}
secp256k1_scalar_set_b32(&m, msg32, NULL);
if (secp256k1_ecdsa_sig_recover(&sig, &q, &m, recid)) {
ret = secp256k1_eckey_pubkey_serialize(&q, pubkey, pubkeylen, compressed);
}
return ret;
}
int secp256k1_ec_seckey_verify(const unsigned char *seckey) {
secp256k1_scalar_t sec;
int ret;
int overflow;
DEBUG_CHECK(seckey != NULL);
secp256k1_scalar_set_b32(&sec, seckey, &overflow);
ret = !secp256k1_scalar_is_zero(&sec) && !overflow;
secp256k1_scalar_clear(&sec);
return ret;
}
int secp256k1_ec_pubkey_verify(const unsigned char *pubkey, int pubkeylen) {
secp256k1_ge_t q;
DEBUG_CHECK(pubkey != NULL);
return secp256k1_eckey_pubkey_parse(&q, pubkey, pubkeylen);
}
int secp256k1_ec_pubkey_create(unsigned char *pubkey, int *pubkeylen, const unsigned char *seckey, int compressed) {
secp256k1_gej_t pj;
secp256k1_ge_t p;
secp256k1_scalar_t sec;
DEBUG_CHECK(secp256k1_ecmult_gen_consts != NULL);
DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(pubkeylen != NULL);
DEBUG_CHECK(seckey != NULL);
secp256k1_scalar_set_b32(&sec, seckey, NULL);
secp256k1_ecmult_gen(&pj, &sec);
secp256k1_scalar_clear(&sec);
secp256k1_ge_set_gej(&p, &pj);
return secp256k1_eckey_pubkey_serialize(&p, pubkey, pubkeylen, compressed);
}
int secp256k1_ec_pubkey_decompress(unsigned char *pubkey, int *pubkeylen) {
secp256k1_ge_t p;
DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(pubkeylen != NULL);
if (!secp256k1_eckey_pubkey_parse(&p, pubkey, *pubkeylen))
return 0;
return secp256k1_eckey_pubkey_serialize(&p, pubkey, pubkeylen, 0);
}
int secp256k1_ec_privkey_tweak_add(unsigned char *seckey, const unsigned char *tweak) {
secp256k1_scalar_t term;
secp256k1_scalar_t sec;
int ret;
int overflow = 0;
DEBUG_CHECK(seckey != NULL);
DEBUG_CHECK(tweak != NULL);
secp256k1_scalar_set_b32(&term, tweak, &overflow);
secp256k1_scalar_set_b32(&sec, seckey, NULL);
ret = secp256k1_eckey_privkey_tweak_add(&sec, &term) && !overflow;
if (ret) {
secp256k1_scalar_get_b32(seckey, &sec);
}
secp256k1_scalar_clear(&sec);
secp256k1_scalar_clear(&term);
return ret;
}
int secp256k1_ec_pubkey_tweak_add(unsigned char *pubkey, int pubkeylen, const unsigned char *tweak) {
secp256k1_ge_t p;
secp256k1_scalar_t term;
int ret;
int overflow = 0;
DEBUG_CHECK(secp256k1_ecmult_consts != NULL);
DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(tweak != NULL);
secp256k1_scalar_set_b32(&term, tweak, &overflow);
if (overflow) {
return 0;
}
ret = secp256k1_eckey_pubkey_parse(&p, pubkey, pubkeylen);
if (ret) {
ret = secp256k1_eckey_pubkey_tweak_add(&p, &term);
}
if (ret) {
int oldlen = pubkeylen;
ret = secp256k1_eckey_pubkey_serialize(&p, pubkey, &pubkeylen, oldlen <= 33);
VERIFY_CHECK(pubkeylen == oldlen);
}
return ret;
}
int secp256k1_ec_privkey_tweak_mul(unsigned char *seckey, const unsigned char *tweak) {
secp256k1_scalar_t factor;
secp256k1_scalar_t sec;
int ret;
int overflow = 0;
DEBUG_CHECK(seckey != NULL);
DEBUG_CHECK(tweak != NULL);
secp256k1_scalar_set_b32(&factor, tweak, &overflow);
secp256k1_scalar_set_b32(&sec, seckey, NULL);
ret = secp256k1_eckey_privkey_tweak_mul(&sec, &factor) && !overflow;
if (ret) {
secp256k1_scalar_get_b32(seckey, &sec);
}
secp256k1_scalar_clear(&sec);
secp256k1_scalar_clear(&factor);
return ret;
}
int secp256k1_ec_pubkey_tweak_mul(unsigned char *pubkey, int pubkeylen, const unsigned char *tweak) {
secp256k1_ge_t p;
secp256k1_scalar_t factor;
int ret;
int overflow = 0;
DEBUG_CHECK(secp256k1_ecmult_consts != NULL);
DEBUG_CHECK(pubkey != NULL);
DEBUG_CHECK(tweak != NULL);
secp256k1_scalar_set_b32(&factor, tweak, &overflow);
if (overflow) {
return 0;
}
ret = secp256k1_eckey_pubkey_parse(&p, pubkey, pubkeylen);
if (ret) {
ret = secp256k1_eckey_pubkey_tweak_mul(&p, &factor);
}
if (ret) {
int oldlen = pubkeylen;
ret = secp256k1_eckey_pubkey_serialize(&p, pubkey, &pubkeylen, oldlen <= 33);
VERIFY_CHECK(pubkeylen == oldlen);
}
return ret;
}
int secp256k1_ec_privkey_export(const unsigned char *seckey, unsigned char *privkey, int *privkeylen, int compressed) {
secp256k1_scalar_t key;
int ret;
DEBUG_CHECK(seckey != NULL);
DEBUG_CHECK(privkey != NULL);
DEBUG_CHECK(privkeylen != NULL);
secp256k1_scalar_set_b32(&key, seckey, NULL);
ret = secp256k1_eckey_privkey_serialize(privkey, privkeylen, &key, compressed);
secp256k1_scalar_clear(&key);
return ret;
}
int secp256k1_ec_privkey_import(unsigned char *seckey, const unsigned char *privkey, int privkeylen) {
secp256k1_scalar_t key;
int ret;
DEBUG_CHECK(seckey != NULL);
DEBUG_CHECK(privkey != NULL);
ret = secp256k1_eckey_privkey_parse(&key, privkey, privkeylen);
if (ret)
secp256k1_scalar_get_b32(seckey, &key);
secp256k1_scalar_clear(&key);
return ret;
}