QT 中使用 rsa 加密签名

代码

头文件

#ifndef RSA_H
#define RSA_H#include <QDebug>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include<openssl/bio.h>
#include <openssl/err.h>
// define rsa public key
#define BEGIN_RSA_PUBLIC_KEY    "BEGIN RSA PUBLIC KEY"      //
#define BEGIN_PUBLIC_KEY        "BEGIN PUBLIC KEY"          // 公钥头部
#define KEY_LENGTH              1024                        // 密钥长度class rsa
{public:rsa();// 生成一对公钥和私钥static bool MakeUpRsaKey (QString& publicKey, QString& privateKey);/*** @brief rsa_pri_encrypt 私钥加密* @param strClearData 明文* @param strPriKey 私钥* @return 加密后数据(base64格式)*/static QString rsa_pri_encrypt_base64 (const QString& strClearData, const QString& strPriKey);/*** @brief rsa_pub_decrypt 公钥解密* @param strDecrypt 待解密数据(base64格式)* @param strPubKey 公钥钥* @return 明文*/static QString rsa_pub_decrypt_base64 (const QString& strDecryptData, const QString& strPubKey);/*** @brief rsa_pub_encrypt 公钥加密* @param strClearData 明文* @param strPubKey 私钥* @return 加密后数据(base64格式)*/static QString rsa_pub_encrypt_base64 (const QString& strClearData, const QString& strPubKey);/*** @brief rsa_pri_decrypt 私钥解密* @param strDecrypt 待解密数据(base64格式)* @param strPriKey 私钥* @return 明文*/static QString rsa_pri_decrypt_base64 (const QString& strDecryptData, const QString& strPriKey);// 签名 strData 原始字符串;  strSigned 签名结果 ; strPriKey 私钥static bool RSASignAction( char *str, QString &strSigned, const char *pri);// 验签  strData 原始字符串; strSigned 待验签字符串 ;strPubKey 公钥static bool RSAVerAction(QString strData,QString &strSigned,QString & strPubKey);/**< 测试 */static void test ();};#endif // RSA_H

源文件

#include "rsa.h"// 转换为base64格式输出
int Base64Encode(unsigned char *plaintext, size_t plainlen, char *ciphertext,size_t *cipherlen)
{if (!ciphertext){*cipherlen = (plainlen + 2) / 3 * 4;return 0;}int nLen = EVP_EncodeBlock((unsigned char *)ciphertext, (const unsigned char *)plaintext,(int)plainlen);if (nLen < 0){return -2;}*cipherlen = nLen;return 0;
}rsa::rsa()
{}
bool rsa::MakeUpRsaKey (QString& strPubKey, QString& strPriKey)
{RSA *pRsa = RSA_generate_key(KEY_LENGTH, RSA_3, NULL, NULL);if ( !pRsa ){return false;}BIO *pPriBio = BIO_new(BIO_s_mem());PEM_write_bio_RSAPrivateKey(pPriBio, pRsa, NULL, NULL, 0, NULL, NULL);BIO *pPubBio = BIO_new(BIO_s_mem());PEM_write_bio_RSAPublicKey(pPubBio, pRsa);// 获取长度size_t nPriKeyLen = BIO_pending(pPriBio);size_t nPubKeyLen = BIO_pending(pPubBio);// 密钥对读取到字符串char* pPriKey = new char[nPriKeyLen];char* pPubKey = new char[nPubKeyLen];BIO_read(pPriBio, pPriKey, nPriKeyLen);BIO_read(pPubBio, pPubKey, nPubKeyLen);// 存储密钥对strPubKey = QByteArray(pPubKey, nPubKeyLen);strPriKey = QByteArray(pPriKey, nPriKeyLen);// 内存释放RSA_free(pRsa);BIO_free_all(pPriBio);BIO_free_all(pPubBio);delete pPriKey;delete pPubKey;return true;
}/*** @brief rsa_pri_encrypt 私钥加密* @param strClearData 明文* @param strPriKey 私钥* @return 加密后数据(base64格式)*/
QString rsa::rsa_pri_encrypt_base64 (const QString& strClearData, const QString& strPriKey)
{QByteArray priKeyArry = strPriKey.toUtf8();uchar* pPriKey = (uchar*)priKeyArry.data();BIO* pKeyBio = BIO_new_mem_buf(pPriKey, strPriKey.length());if (pKeyBio == NULL){return "";}RSA* pRsa = RSA_new();pRsa = PEM_read_bio_RSAPrivateKey(pKeyBio, &pRsa, NULL, NULL);if ( pRsa == NULL ){BIO_free_all(pKeyBio);return "";}int nLen = RSA_size(pRsa);char* pEncryptBuf = new char[nLen];memset(pEncryptBuf, 0, nLen);QByteArray clearDataArry = strClearData.toUtf8();int nClearDataLen = clearDataArry.length();uchar* pClearData = (uchar*)clearDataArry.data();int nSize = RSA_private_encrypt(nClearDataLen,pClearData,(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;
}/*** @brief rsa_pub_decrypt 公钥解密* @param strDecrypt 待解密数据(base64格式)* @param strPubKey 公钥* @return 明文*/
QString rsa::rsa_pub_decrypt_base64(const QString& strDecryptData, const QString& strPubKey)
{QByteArray pubKeyArry = strPubKey.toUtf8();uchar* pPubKey = (uchar*)pubKeyArry.data();BIO* pKeyBio = BIO_new_mem_buf(pPubKey, strPubKey.length());if (pKeyBio == NULL){qDebug()<<"error 1";return "";}RSA* pRsa = RSA_new();if ( strPubKey.contains(BEGIN_RSA_PUBLIC_KEY) ){pRsa = PEM_read_bio_RSAPublicKey(pKeyBio, &pRsa, NULL, NULL);}else{pRsa = PEM_read_bio_RSA_PUBKEY(pKeyBio, &pRsa, NULL, NULL);}if ( pRsa == NULL ){BIO_free_all(pKeyBio);qDebug()<<"error 2";return "";}int nLen = RSA_size(pRsa);char* pClearBuf = new char[nLen];memset(pClearBuf, 0, nLen);//解密QByteArray decryptDataArry = strDecryptData.toUtf8();decryptDataArry = QByteArray::fromBase64(decryptDataArry);int nDecryptDataLen = decryptDataArry.length();uchar* pDecryptData = (uchar*)decryptDataArry.data();int nSize = RSA_public_decrypt(nDecryptDataLen,pDecryptData,(uchar*)pClearBuf,pRsa,RSA_PKCS1_PADDING);QString strClearData = "";if ( nSize >= 0 ){strClearData = QByteArray(pClearBuf, nSize);}// 释放内存delete pClearBuf;BIO_free_all(pKeyBio);RSA_free(pRsa);return strClearData;
}/*** @brief rsa_pub_encrypt 公钥加密* @param strClearData 明文* @param strPubKey 私钥* @return 加密后数据(base64格式)*/
QString rsa::rsa_pub_encrypt_base64 (const QString& strClearData, const QString& strPubKey)
{QByteArray pubKeyArry = strPubKey.toUtf8();uchar* pPubKey = (uchar*)pubKeyArry.data();BIO* pKeyBio = BIO_new_mem_buf(pPubKey, pubKeyArry.length());if (pKeyBio == NULL){return "";}RSA* pRsa = RSA_new();if ( strPubKey.contains(BEGIN_RSA_PUBLIC_KEY) ){pRsa = PEM_read_bio_RSAPublicKey(pKeyBio, &pRsa, NULL, NULL);}else{pRsa = PEM_read_bio_RSA_PUBKEY(pKeyBio, &pRsa, NULL, NULL);}if ( pRsa == NULL ){BIO_free_all(pKeyBio);return "";}int nLen = RSA_size(pRsa);char* pEncryptBuf = new char[nLen];memset(pEncryptBuf, 0, nLen);QByteArray clearDataArry = strClearData.toUtf8();int nClearDataLen = clearDataArry.length();uchar* pClearData = (uchar*)clearDataArry.data();int nSize = RSA_public_encrypt(nClearDataLen,pClearData,(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;
}/*** @brief rsa_pri_decrypt 私钥解密* @param strDecrypt 待解密数据(base64格式)* @param strPriKey 私钥* @return 明文*/
QString rsa::rsa_pri_decrypt_base64(const QString& strDecryptData, const QString& strPriKey)
{QByteArray priKeyArry = strPriKey.toUtf8();uchar* pPriKey = (uchar*)priKeyArry.data();BIO* pKeyBio = BIO_new_mem_buf(pPriKey, priKeyArry.length());if (pKeyBio == NULL){return "";}RSA* pRsa = RSA_new();pRsa = PEM_read_bio_RSAPrivateKey(pKeyBio, &pRsa, NULL, NULL);if ( pRsa == NULL ){BIO_free_all(pKeyBio);return "";}int nLen = RSA_size(pRsa);char* pClearBuf = new char[nLen];memset(pClearBuf, 0, nLen);//解密QByteArray decryptDataArry = strDecryptData.toUtf8();decryptDataArry = QByteArray::fromBase64(decryptDataArry);int nDecryptDataLen = decryptDataArry.length();uchar* pDecryptData = (uchar*)decryptDataArry.data();int nSize = RSA_private_decrypt(nDecryptDataLen,pDecryptData,(uchar*)pClearBuf,pRsa,RSA_PKCS1_PADDING);QString strClearData = "";if ( nSize >= 0 ){strClearData = QByteArray(pClearBuf, nSize);}// 释放内存delete pClearBuf;BIO_free_all(pKeyBio);RSA_free(pRsa);return strClearData;
}void rsa::test()
{/**< rsa private/public key 若从文件中拷贝出来，需要注意保存元先文件格式，即换行符需要带上，包括最后一行的换行符 *///QString strPriKey = "";// QString strPubKey = "";/***  用代码生成的key与openssl命令生成的key区别：*  1、代码生成key，标题为 -----BEGIN RSA PUBLIC KEY-----,openssl命令生成key, 标题为 -----BEGIN PUBLIC KEY-----*  2、获取RSA函数不同，代码生成key，用PEM_read_bio_RSAPublicKey，openssl命令生成key，用PEM_read_bio_RSA_PUBKEY*///MakeUpRsaKey(strPubKey, strPriKey);//qDebug() << strPubKey << endl;//qDebug() << strPriKey << endl;/*strPubKey = QString("-----BEGIN PUBLIC KEY-----\n")+QString("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCbXcFx8TIEnRjS9H+KxapUBI6r\n") +QString("QO8ZeeZKDpa1V/lUg7FsUOdhfjze8YkL2F1et0zSjK7YeQPjWO8NDg7/TTLfpW27\n")+QString("krhkreYFQ9Y4vHrCKhjc3DD+Yzy9wyKKn5O9M9qU0Kzu8ads/mrPe82/xoo/XDv2\n") +QString("eTR755MEi1BO+S1RLQIDAQAB\n")+QString("-----END PUBLIC KEY-----");strPriKey = QString("-----BEGIN PRIVATE KEY-----\n")+QString("MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAJtdwXHxMgSdGNL0\n") +QString("f4rFqlQEjqtA7xl55koOlrVX+VSDsWxQ52F+PN7xiQvYXV63TNKMrth5A+NY7w0O\n") +QString("Dv9NMt+lbbuSuGSt5gVD1ji8esIqGNzcMP5jPL3DIoqfk70z2pTQrO7xp2z+as97\n") +QString("zb/Gij9cO/Z5NHvnkwSLUE75LVEtAgMBAAECgYBkwqY9hkaBFX1O+wBoeI9hk98P\n") +QString("E7q9VABVUSbOjzKFbC855zJYWS2TDSRrSTQsxEYPWuveOoWaAUhvuAlj66YswIL6\n") +QString("BRgA20eoDr34w+1GABXbFSrP2L1rR2v0qEdiSPsACI0aAmZGO4eq+Fns+EuJ0KSg\n") +QString("FIZmv3rJV7Nhd9aTQQJBAMmpvcCjxVLfTfiT52j6FDTpAMmd5e832EUEWdzAIzh7\n") +QString("Z57vsmR7eGbp+9kiRl3eZMOPg2wdfkXvHUrmQK0F/p0CQQDFOpCs75lIVufTZKDU\n") +QString("7tMQXr4Tzc8EJPaeBuSDXey5okek+ntq55C3xo8nEgDtaVP6mcLqpZR/s+6PjChb\n") +QString("rk/RAkBzQ7z8pd78Xjx/z3Iec4onL+LOWpz5XW8VC8adQYkgGJECrDjH7DbGhAj6\n") +QString("c/fKYXowuQ/CNR1etayFihP/kYSVAkB0sxSL3zG5hgKiKHapx66Hjye1HCAT+bMb\n") +QString("CkUIHflGVelCixufw+jzdL+bhKGb2KjiLT0SDmtxrIvJ0ErJBLkhAkEAj8Yh3H+W\n") +QString("OWauml/oVqNTbCKttV6irPYVUJkcJnnByjWxVP2I7hmJNuxNAKsNjR204IMsMaWh\n") +QString("qbByj4ywB5LieQ==\n")+QString("-----END PRIVATE KEY-----");*//* qDebug() << "useing publicKey to Encrypt and privateKey Decrypt:";QString strClear = "hello334344554 WORLD12W2WDWDEDWDD";qDebug() << "after publicKey Encrypt:";QString strEncryptData = rsa_pub_encrypt_base64 (strClear, strPubKey);qDebug() << strEncryptData;qDebug()<<  "after privateKey Decrypt:";QString strClearData = rsa_pri_decrypt_base64 (strEncryptData, strPriKey);qDebug() << strClearData;*/// 现在进行签名测试，使用私钥签名，公钥验签QString priKey = QString("-----BEGIN PRIVATE KEY-----\n")+QString("MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAJQOMmftEDgwvnM3\n") +QString("PKWbvF+xvSGLVaJYySSQtmKczEE2ufYR2LM2qwsZhBUwzW+ssKGVrCsjmmI5G4oF\n") +QString("gcVsa3uA221c6oDaERvQYrFNN9KaLNrIdEA1Nh0MTAg5M6AK2wTHnPH5DGrVXtGs\n") +QString("k6ZLTuKUjpR8iWMMc+0C5ApG3ssLAgMBAAECgYAEiLbEdf8UKXH7p0plK/LF33SS\n") +QString("TWkO8rceNoxPUsvyh1GElqFTQ65TRbHE0FzKObijCilenNWCgos0W9zQhfR4pLkJ\n") +QString("jZyv+W4xJ3qAH7drzcd2MgBP1v91gJK6VPjD+J0pNACF1xGLsFBZmWIbFATDU38z\n") +QString("3SbTPVS15oPXgDdEwQJBAOF2v+skafKdtKmLgy3Hna+iA+uNNUZ7q8bQyjY4nviV\n") +QString("FRL3MBgugIpUYaiiCzhl8BZftoB6pg0DCBOlQxONgiECQQCoG43bGjM0uh7e8cMT\n") +QString("45OJDruii7wQnpJuZZH67qOGtnZA/coYDGArqFwmrQz2nQJGwePvNt4kT3Ibighf\n") +QString("ev+rAkEAtuXKEkpb2ACvCcqvA3gnJs7bNz45tY+lbYb6Qrnz29u0WMpFLZirlYuW\n") +QString("HWI2j+3BsaS7O8ZC5dNLvgQWQcpNgQJBAJwm3CIFuELmD/7ve1FiN408TjayrcKS\n") +QString("SVqapnr8aJGds0Kze6HS/RIQlWinnj8FoTOwrtVplfcMhOXn1dc7HXkCQQCRu9UN\n") +QString("4mMrQLLg7S88fbjxsy7+cuELxBNrix3GU8F6EAtWWq2e1EaUu0VVtRq7f/IKPdKD\n") +QString("uEBxsPfr/EXy6yDw\n")+QString("-----END PRIVATE KEY-----");QString pbKey = QString("-----BEGIN PUBLIC KEY-----\n")+QString("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCUDjJn7RA4ML5zNzylm7xfsb0h\n") +QString("i1WiWMkkkLZinMxBNrn2EdizNqsLGYQVMM1vrLChlawrI5piORuKBYHFbGt7gNtt\n")+QString("XOqA2hEb0GKxTTfSmizayHRANTYdDEwIOTOgCtsEx5zx+Qxq1V7RrJOmS07ilI6U\n") +QString("fIljDHPtAuQKRt7LCwIDAQAB\n")+QString("-----END PUBLIC KEY-----");QString aaa = "SZHAILEI88123456&111122334";QString ret="";rsa::RSASignAction(aaa,ret,priKey);qDebug()<<"after =========> "<<ret;bool flag = rsa::RSAVerAction(aaa,ret,pbKey);if(flag){qDebug()<<"@@@@@@@@@@ success !";}else{qDebug()<<"@@@@@@@@@ failed !";}
}bool rsa::RSASignAction(QString strData, QString &strSigned,QString &strPriKey)
{qDebug()<<"now rsa sign";QByteArray clearDataArry = strData.toUtf8();int len = clearDataArry.length();QByteArray priKeyArry = strPriKey.toUtf8();uchar* pPriKey = (uchar*)priKeyArry.data();BIO* pKeyBio = BIO_new_mem_buf(pPriKey, strPriKey.length());if (pKeyBio == NULL){return false;}RSA* prsa = NULL;prsa = PEM_read_bio_RSAPrivateKey(pKeyBio, &prsa, NULL, NULL);if ( prsa == NULL ){BIO_free_all(pKeyBio);return false;}unsigned char szTmp[1024] = {0};SHA256((const unsigned char*)clearDataArry.data(),len,szTmp);int nlen = 0;unsigned int nlenRet = 0;char szTmp1[1024] = {0};nlen  = RSA_sign(NID_sha256,szTmp,SHA256_DIGEST_LENGTH,(unsigned char*)szTmp1,&nlenRet,prsa);if(nlen!=1){RSA_free(prsa);BIO_free_all(pKeyBio);return false;}QByteArray  arry = QByteArray(szTmp1);strSigned = QString(arry.toBase64());BIO_free_all(pKeyBio);RSA_free(prsa);return true;
}bool rsa::RSAVerAction( char *str, QString &strSigned, const char *pri)
{int  len = strlen(str);BIO* pKeyBio = BIO_new_mem_buf(pri, strlen(pri));if (pKeyBio == NULL){return false;}RSA* prsa = NULL;prsa = PEM_read_bio_RSAPrivateKey(pKeyBio, &prsa, NULL, NULL);if ( prsa == NULL ){BIO_free_all(pKeyBio);return false;}unsigned char szTmp[1024] = {0};SHA256((const unsigned char*)str,len,szTmp);int nlen = 0;unsigned int nlenRet = 0;unsigned char szTmp1[1024] = {0};nlen  = RSA_sign(NID_sha256,szTmp,SHA256_DIGEST_LENGTH,szTmp1,&nlenRet,prsa);if(nlen!=1){RSA_free(prsa);BIO_free_all(pKeyBio);return false;}size_t plainlen = 0;uint8_t plaintext[1024]={0};Base64Encode(szTmp1,nlenRet,(char*)plaintext,&plainlen);strSigned = QString("%1").arg((char*)plaintext);BIO_free_all(pKeyBio);RSA_free(prsa);return true;
}

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