Qt Openssl Ras 加密

1.需要应用的库文件

pro文件添加：

INCLUDEPATH += $$PWD/openssl/
LIBS += -L$$PWD/./lib -llibeay32
LIBS += -L$$PWD/./lib -lssleay32

2.使用示例

#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>

#define BEGIN_RSA_PUBLIC_KEY    "BEGIN RSA PUBLIC KEY"
#define BEGIN_RSA_PRIVATE_KEY   "BEGIN RSA PRIVATE KEY"
#define BEGIN_PUBLIC_KEY        "BEGIN PUBLIC KEY"
#define BEGIN_PRIVATE_KEY       "BEGIN PRIVATE KEY"
#define KEY_LENGTH              1024


/*!
 * \brief 公钥加密（非对称）
 * \param strPlainData 需要加密数据
 * \return
 */
QString pcTools::rsaPubEncrypt(const QString &strPlainData)
{
    
    
    //默认公钥
    m_publicEncryptKey = "-----BEGIN PUBLIC KEY-----\n"
                         "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC5mcB+jiv2m4e7M7UBN8IiIDsS\n"
                         "W6NizcGuIr2gzwrhyoRb9hz8fg4fgcRmmmsssSswBeH7Y5xSaD5uHf9aoArRk2iH\n"
                         "po3lj9rXXwHdACudsIRh+Zt1/Z1MRsa0RfSCEOgMmyceWVe7GepPyg9sVr+PvFPh\n"
                         "NpZntrzfcBauB/+2iQIDAQsB\n"
                         "-----END PUBLIC KEY-----\n";
    
    QByteArray pubKeyArry = m_publicEncryptKey.toUtf8();
    uchar* pPubKey = (uchar*)pubKeyArry.data();
    BIO* pKeyBio = BIO_new_mem_buf(pPubKey, pubKeyArry.length());
    if (pKeyBio == nullptr)
    {
    
    
        return "";
    }

    RSA* pRsa = RSA_new();
    if (m_publicEncryptKey.contains(BEGIN_RSA_PUBLIC_KEY))
    {
    
    
        pRsa = PEM_read_bio_RSAPublicKey(pKeyBio, nullptr, nullptr, nullptr);
    }
    else
    {
    
    
        pRsa = PEM_read_bio_RSA_PUBKEY(pKeyBio, nullptr, nullptr, nullptr);
    }

    if (pRsa == nullptr)
    {
    
    
        BIO_free_all(pKeyBio);
        return "";
    }

    int nLen = RSA_size(pRsa);
    char* pEncryptBuf = new char[nLen];
    memset(pEncryptBuf, 0, nLen);

    //加密
    QByteArray plainDataArry = strPlainData.toUtf8();
    int nPlainDataLen = plainDataArry.length();
    uchar* pPlainData = (uchar*)plainDataArry.data();
    int nSize = RSA_public_encrypt(nPlainDataLen,
                                   pPlainData,
                                   (uchar*)pEncryptBuf,
                                   pRsa,
                                   RSA_PKCS1_PADDING);

    QString strEncryptData = "";
    if (nSize >= 0)
    {
    
    
        QByteArray arry(pEncryptBuf, nSize);
        strEncryptData = arry.toBase64();
    }

    //释放内存
    delete[] pEncryptBuf;
    BIO_free_all(pKeyBio);
    RSA_free(pRsa);

    return strEncryptData;
}

注：公钥或者密钥 使用字符串传输都要加 \n 不然会导致 PEM_read_bio_RSA_PUBKEY或者PEM_read_bio_RSAPublicKey 函数返回空值。

参考示例：https://blog.csdn.net/u011029517/article/details/79392522