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sm2signverify.cpp
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sm2signverify.cpp
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#include "sm2signverify.h"
#include "ui_sm2signverify.h"
Sm2SignVerify::Sm2SignVerify(QWidget *parent)
: QWidget(parent)
, ui(new Ui::Sm2SignVerify)
{
ui->setupUi(this);
}
Sm2SignVerify::~Sm2SignVerify()
{
delete ui;
}
void Sm2SignVerify::on_pushButtonGenKey_clicked()
{
/* 选定椭圆曲线组 */
std::shared_ptr<EC_GROUP> group(EC_GROUP_new_by_curve_name(NID_sm2), EC_GROUP_free);
if (!group) {
getError();
return;
}
/* 密钥上下文生成 */
std::shared_ptr<EC_KEY> key(EC_KEY_new(), EC_KEY_free);
/* 设定密钥的曲线组 */
EC_KEY_set_group(key.get(), group.get());
/* 生成EC_KEY */
int res = EC_KEY_generate_key(key.get());
if (res != 1) {
getError();
return;
}
/* 取公钥并转换为十六进制字符串 */
const EC_POINT *pubPoint = EC_KEY_get0_public_key(key.get());
std::shared_ptr<char> pubHexStr(EC_POINT_point2hex(group.get(),
pubPoint,
POINT_CONVERSION_UNCOMPRESSED,
NULL),
[](char *pub) { OPENSSL_free(pub); });
/* 取私钥并转换为十六进制字符串 */
const BIGNUM *priBn = EC_KEY_get0_private_key(key.get());
std::shared_ptr<char> priHexStr(BN_bn2hex(priBn), [](char *pri) { OPENSSL_free(pri); });
/* 在浏览框中显示公钥和私钥 */
this->ui->lineEditPriKey->setText(QString(priHexStr.get()));
this->ui->plainTextEditPubKey->setPlainText(QString(pubHexStr.get()));
}
void Sm2SignVerify::on_pushButtonSign_clicked()
{
/* 获取私钥 */
QString priQstr = this->ui->lineEditPriKey->text();
if (priQstr.isEmpty()) {
QMessageBox::warning(NULL,
"warning",
QString("请输入或者生成私钥！"),
QMessageBox::Close,
QMessageBox::Close);
return;
}
/* 获取待签名数据 */
QString inputQstr = this->ui->lineEditInput->text();
if (inputQstr.isEmpty()) {
QMessageBox::warning(NULL,
"warning",
QString("请输入待签数据！"),
QMessageBox::Close,
QMessageBox::Close);
return;
}
/* 选定椭圆曲线组 */
std::shared_ptr<EC_GROUP> group(EC_GROUP_new_by_curve_name(NID_sm2), EC_GROUP_free);
/* EC密钥生成 */
std::shared_ptr<EC_KEY> ecKey(EC_KEY_new(), EC_KEY_free);
/* 设定密钥的曲线组 */
EC_KEY_set_group(ecKey.get(), group.get());
/* 将16进制字符串私钥转为BIGNUM，并设置到EC_KEY */
BIGNUM *priBn = BN_new();
BN_hex2bn(&priBn, priQstr.toStdString().c_str());
EC_KEY_set_private_key(ecKey.get(), priBn);
BN_free(priBn);
/* 将16进制字符串公钥转为ECPOINT，并设置到EC_KEY */
QString pubQstrInput = this->ui->plainTextEditPubKey->toPlainText();
const EC_POINT *pubPoint
= EC_POINT_hex2point(group.get(), pubQstrInput.toStdString().c_str(), NULL, NULL);
EC_KEY_set_public_key(ecKey.get(), pubPoint);
/* 将EC_KEY设置到EVP_PKEY */
std::shared_ptr<EVP_PKEY> pKey(EVP_PKEY_new(), EVP_PKEY_free);
EVP_PKEY_set1_EC_KEY(pKey.get(), ecKey.get());
/* 签名上下文及初始化 */
size_t siglen = 0;
std::shared_ptr<EVP_MD_CTX> mctx(EVP_MD_CTX_new(), EVP_MD_CTX_free);
if (!EVP_DigestSignInit(mctx.get(), NULL, EVP_sm3(), NULL, pKey.get())
|| !EVP_DigestSign(mctx.get(),
NULL,
&siglen,
(unsigned char *) inputQstr.toStdString().c_str(),
inputQstr.size())) {
getError();
return;
}
/* 签名 */
std::shared_ptr<unsigned char> sig((unsigned char *) OPENSSL_malloc(siglen),
[](unsigned char *buf) { OPENSSL_free(buf); });
int ret = EVP_DigestSign(mctx.get(),
sig.get(),
&siglen,
(unsigned char *) inputQstr.toStdString().c_str(),
inputQstr.size());
if (ret != 1) {
getError();
return;
}
/* 显示十六进制字符串到输出框 */
std::shared_ptr<char> out(OPENSSL_buf2hexstr(sig.get(), siglen),
[](char *buf) { OPENSSL_free(buf); });
this->ui->plainTextEditOutput->setPlainText(QString(out.get()));
}
void Sm2SignVerify::on_pushButtonVerify_clicked()
{
/* 获取原文 */
QString inputQstr = this->ui->lineEditInput->text();
/* 获取签名 */
QString signQstr = this->ui->plainTextEditOutput->toPlainText();
long siglen = signQstr.size();
const unsigned char *sig = OPENSSL_hexstr2buf(signQstr.toStdString().c_str(), &siglen);
/* 选定椭圆曲线组 */
std::shared_ptr<EC_GROUP> group(EC_GROUP_new_by_curve_name(NID_sm2), EC_GROUP_free);
/* 密钥上下文生成 */
std::shared_ptr<EC_KEY> eckey(EC_KEY_new(), EC_KEY_free);
/* 设定密钥的曲线组 */
EC_KEY_set_group(eckey.get(), group.get());
/* 获取用户输入的公钥 */
QString pubQstrInput = this->ui->plainTextEditPubKey->toPlainText();
/* 将16进制字符串公钥转为EC_POINT，并设置到EC_KEY */
const EC_POINT *pubPoint
= EC_POINT_hex2point(group.get(), pubQstrInput.toStdString().c_str(), NULL, NULL);
EC_KEY_set_public_key(eckey.get(), pubPoint);
/* 将EC_KEY设置到EVP_PKEY */
std::shared_ptr<EVP_PKEY> pKey(EVP_PKEY_new(), EVP_PKEY_free);
EVP_PKEY_set1_EC_KEY(pKey.get(), eckey.get());
/* 验签上下文及初始化 */
std::shared_ptr<EVP_MD_CTX> mctx(EVP_MD_CTX_new(), EVP_MD_CTX_free);
if (!EVP_DigestVerifyInit(mctx.get(), NULL, EVP_sm3(), NULL, pKey.get())) {
getError();
return;
}
/* 验签 */
int ret = EVP_DigestVerify(mctx.get(),
sig,
siglen,
(unsigned char *) inputQstr.toStdString().c_str(),
inputQstr.size());
if (ret == 1) {
/* 验签成功 */
QMessageBox::warning(NULL,
"warning",
QString("验签成功！"),
QMessageBox::Close,
QMessageBox::Close);
} else if (ret == 0) {
/* 验签失败 */
QMessageBox::warning(NULL,
"warning",
QString("验签失败！"),
QMessageBox::Close,
QMessageBox::Close);
} else {
getError();
return;
}
}