使用openssl進行RSA加密解密
阿新 • • 發佈：2019-01-24
原文：http://blog.csdn.net/zzj806683450/article/details/17426193
我使用openssl 1.0.1e，過程中遇到一些問題。
#include "stdafx.h" #include <stdio.h> #include <stdlib.h> #include <openssl/rsa.h> #include<openssl/pem.h> #include<openssl/err.h> #include <openssl/bio.h> #include <fstream> #include <iostream> #include <string> using namespace std; #pragma comment(lib, "libeay32.lib") #pragma comment(lib, "ssleay32.lib") #define PRIVATE_KEY_FILE "private.pem" #define PUBLIC_KEY_FILE "public.pem" const static char* pszPublicKey = "-----BEGIN RSA PUBLIC KEY-----\n" "MIGJAoGBAK7mh7RSMtisKLn+Jfkq9AUlOHqUe4zjTLVC89k+sPux5ZMr9ndtjzdx\n" "8bCcSfCQtemKrR2LY4lRr5cZs3jgwaBbHS2SdCezUuNUdrEEsfWX8BlK13G8djFm\n" "mYZqKeQFnUrKZn+uA0A4nIGPRFKB2fKfBjh4Y5qN2IoyV9Y0e8HHAgMBAAE=\n" "-----END RSA PUBLIC KEY-----"; const static char* pszPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\n" "MIICXQIBAAKBgQCu5oe0UjLYrCi5/iX5KvQFJTh6lHuM40y1QvPZPrD7seWTK/Z3\n" "bY83cfGwnEnwkLXpiq0di2OJUa+XGbN44MGgWx0tknQns1LjVHaxBLH1l/AZStdx\n" "vHYxZpmGainkBZ1KymZ/rgNAOJyBj0RSgdnynwY4eGOajdiKMlfWNHvBxwIDAQAB\n" "AoGASbqenFJGYvZ4GKfdhCMqSPz+yRXM24B6NrMprnvyCbhdiePvezrxM7NR6lyI\n" "AuRN+0xdW+YFqL6Joc3QzXUZyffUtJ0I25J/r2UvpEY0GaH7JJKdfpE4YycQRkRc\n" "gGt9YbcIjU4w0IpoIMH5G809ab6gTUxO1AwaAH1BovGt0vkCQQDfZxGT/AF+yCud\n" "8YTqfEWRNgSOWxyyXefSCGh3x6HDo5uybOrVVpUOcB6WVRoj3mgUEtzAz4+jqe30\n" "Bbknx8tFAkEAyGu5g6PjylakW1unrd1c3qlXR6C1wSHpYfpqhuDdw8nqD35pIWBy\n" "UF9ELfd6gbh/6fnfiKcQJEDlgnkkKchjmwJALmvKWUe6P8/0UEOJbPgZtIzW8YW5\n" "Ns8QhrI8kvcmg/KRPcgoG+B75J4jnPVeEyn50oIA4QfAPy/mRBiUWtHHSQJBALZb\n" "PeqG/kYmW1k8pe7OUSfPULi9g2J85ordfHvIsj7owuziCenyhVCXvcNNP8w0AT70\n" "uezuhQNXgPwcGUljKS0CQQDcKBgUE8PoT4Sic6WGvx+2S+gdXplNoZWhY/1p05fp\n" "ddSkrRUiaC7CUGYilG2ea1r+7VWVWsSwS8vSceIBxBeV\n" "-----END RSA PRIVATE KEY-----"; void generateKey() { /* 生成公鑰 */ RSA* rsa = RSA_generate_key( 1024, RSA_F4, NULL, NULL); BIO *bp = BIO_new( BIO_s_file() ); BIO_write_filename( bp, PUBLIC_KEY_FILE ); PEM_write_bio_RSAPublicKey(bp, rsa); BIO_free_all( bp ); /* 生成私鑰 */ bp = BIO_new( BIO_s_file() ); BIO_write_filename( bp, PRIVATE_KEY_FILE ); PEM_write_bio_RSAPrivateKey(bp, rsa, NULL, NULL, 0, NULL, NULL); CRYPTO_cleanup_all_ex_data(); BIO_free_all( bp ); RSA_free(rsa); } std::string bio_read_privateKey(string data) { OpenSSL_add_all_algorithms(); BIO* bp = BIO_new( BIO_s_file() ); BIO_read_filename( bp, PRIVATE_KEY_FILE ); RSA* rsaK; rsaK = PEM_read_bio_RSAPrivateKey( bp, NULL, NULL, NULL ); if (NULL == rsaK) { printf("read key file fail!\n"); #if 0 unsigned long ulErr = ERR_get_error(); char szErrMsg[1024] = {0}; char *pTmp = NULL; pTmp = ERR_error_string(ulErr,szErrMsg); printf("%s\n", szErrMsg); system("pause"); #endif }else{ //printf("read success!\n"); } int nLen = RSA_size(rsaK); char *pEncode = new char[nLen + 1]; int ret = RSA_private_decrypt(data.length(),(const unsigned char*)data.c_str(),(unsigned char *)pEncode,rsaK,RSA_PKCS1_PADDING); std::string strRet; if (ret >= 0) { strRet = std::string(pEncode, ret); } delete[] pEncode; CRYPTO_cleanup_all_ex_data(); BIO_free_all( bp ); RSA_free(rsaK); return strRet; } std::string bio_read_privateKey2(string data) { OpenSSL_add_all_algorithms(); BIO* bp = BIO_new( BIO_s_mem() ); BIO_puts(bp, pszPrivateKey); RSA* rsaK; rsaK = PEM_read_bio_RSAPrivateKey( bp, NULL, NULL, NULL ); if (NULL == rsaK) { perror("read key file fail!"); }else{ //printf("read success!\n"); } int nLen = RSA_size(rsaK); char *pEncode = new char[nLen + 1]; int ret = RSA_private_decrypt(data.length(),(const unsigned char*)data.c_str(),(unsigned char *)pEncode,rsaK,RSA_PKCS1_PADDING); std::string strRet; if (ret >= 0) { strRet = std::string(pEncode, ret); } delete[] pEncode; CRYPTO_cleanup_all_ex_data(); BIO_free_all( bp ); RSA_free(rsaK); return strRet; } std::string bio_read_publicKey(string data) { OpenSSL_add_all_algorithms(); BIO* bp = BIO_new( BIO_s_file() ); BIO_read_filename( bp, PUBLIC_KEY_FILE ); RSA* rsaK = PEM_read_bio_RSAPublicKey( bp, NULL, NULL, NULL ); if (NULL == rsaK) { printf("read key file fail!"); }else{ } int nLen = RSA_size(rsaK); char *pEncode = new char[nLen + 1]; int ret = RSA_public_encrypt(data.length(),(const unsigned char*)data.c_str(), (unsigned char *)pEncode,rsaK,RSA_PKCS1_PADDING); std::string strRet; if (ret >= 0) { strRet = std::string(pEncode, ret); } delete[] pEncode; CRYPTO_cleanup_all_ex_data(); BIO_free_all( bp ); RSA_free(rsaK); return strRet; } std::string bio_read_publicKey2(string data) { OpenSSL_add_all_algorithms(); BIO* bp = BIO_new( BIO_s_mem() ); BIO_puts(bp, pszPublicKey); RSA* rsaK = PEM_read_bio_RSAPublicKey( bp, NULL, NULL, NULL ); if (NULL == rsaK) { printf("read key file fail!\n"); #if 0 unsigned long ulErr = ERR_get_error(); char szErrMsg[1024] = {0}; char *pTmp = NULL; pTmp = ERR_error_string(ulErr,szErrMsg); printf("%s\n", szErrMsg); system("pause"); #endif }else{ } int nLen = RSA_size(rsaK); char *pEncode = new char[nLen + 1]; int ret = RSA_public_encrypt(data.length(),(const unsigned char*)data.c_str(), (unsigned char *)pEncode,rsaK,RSA_PKCS1_PADDING); std::string strRet; if (ret >= 0) { strRet = std::string(pEncode, ret); } delete[] pEncode; CRYPTO_cleanup_all_ex_data(); BIO_free_all( bp ); RSA_free(rsaK); return strRet; } void encryptFile(string inputfile,string outputfile) { ifstream file(inputfile.c_str()); ofstream outfile(outputfile.c_str()); string tsum; string ss; while (getline(file,ss)) { tsum.append(ss.append("\n")); } cout<<"徐加密內容："<<tsum<<endl; string mw = bio_read_publicKey(tsum); cout<<mw<<endl; outfile<<mw; outfile.flush(); outfile.close(); file.close(); } void decryptFile(string inputfile,string outputfile) { ifstream file(inputfile.c_str()); ofstream outfile(outputfile.c_str()); std::string tsum,ss; while (getline(file,ss)) { tsum.append(ss); } std::string cw = bio_read_privateKey(tsum); cout<<"恢復明文："<<cw; outfile<<cw; outfile.flush(); outfile.close(); file.close(); } int _tmain(int argc, _TCHAR* argv[]) { ERR_load_ERR_strings(); ERR_load_crypto_strings(); char *str = "第一步，首先需要在openssl官網下載openssl包http://www.openssl.org/source/；\n第二步，自己查資料去！"; //system("openssl genrsa -out private.key 1024"); //generateKey(); printf("原文：\n%s\n\n",str); std::string m = bio_read_publicKey2(str); printf("密文：\n%s\n\n",m.c_str()); string miwen = m; std::string c = bio_read_privateKey2(miwen); printf("解密後：\n%s\n\n",c.c_str()); #if 0 encryptFile("d:/before.txt","f:/my.txt"); decryptFile("f:/my.txt","f:/jiemihou.txt"); #endif ERR_free_strings(); system("pause"); return 0; }