AES加密之openssl使用(2)

时间：2022-03-24 13:12:50

       书接上篇《AES加密只openssl安装》，在文章结尾简单列出了openssl接口使用，但是峰回路转旧的代码总是满足不了新的需求。我想将加密后的二进制数手动输入然后通过算法解密，怎么办，。。。。？使用base64啊。加密后的结果因为是二进制数字，而base64编码之中要求传入编码的长度，于是使用strlen就不怎么靠谱了，加密后的长度怎么求出。解决1.使用MD5加密为固定长度，缺点不可逆。2.memset为255(空格)吧

        且看代码：

linux版本suse下编译通过

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/aes.h>
#include <openssl/pem.h>
#include <openssl/bio.h>
#include <openssl/evp.h>


void Base64Encode(unsigned char *inputString, int inLen, unsigned char *outputString, int *outLen)
{    
    BIO *bmem = NULL;
    BIO *b64 = NULL;
    BUF_MEM *bptr = NULL;
    if ((NULL == inputString) ||
        (NULL == outputString))
    {
        return;
    }  

    b64 = BIO_new(BIO_f_base64());
    bmem = BIO_new(BIO_s_mem());
    b64 = BIO_push(b64, bmem);

    BIO_write(b64, inputString, inLen);
    BIO_flush(b64);
    BIO_get_mem_ptr(b64, &bptr);
    if (bptr->length > *outLen)
    {
        *outLen = bptr->length;
        return;
    }

    memcpy(outputString, bptr->data, bptr->length-1);
    outputString[bptr->length-1] = 0;
    *outLen = bptr->length-1;
    BIO_free_all(b64);
    return;
}
void Base64Decode(const char* inputString, int inLen, unsigned char* outputString, int  *outLen)
{
    BIO * b642 = NULL;
    BIO * bmem2 = NULL;
    char tmp[inLen + 1];
    if(NULL == inputString || NULL == outputString)
    {
        return;
    }

    tmp[inLen] = '\n';      /*Openssl demand to have '\n' to end the string.*/
    memcpy(&tmp[0], inputString, inLen);
    memset(outputString, 0 , *outLen);

    b642 = BIO_new(BIO_f_base64());
    bmem2 = BIO_new_mem_buf(&tmp[0], inLen+1);
    bmem2 = BIO_push(b642, bmem2);
    *outLen = BIO_read(bmem2, outputString, *outLen);
    BIO_free_all(bmem2);
    return ;
}

void aes_box_encrypt(unsigned char* source_string, unsigned char* des_string)
{
    int iLoop = 0;
    int iLen =0;
    AES_KEY aes;
    unsigned char key[AES_BLOCK_SIZE];
    unsigned char iv[AES_BLOCK_SIZE];
    if(NULL == source_string || NULL == des_string)
    {
        return;
    }

    //Generate own AES Key
    memcpy(key,"1234567890123456",AES_BLOCK_SIZE);

    // Set encryption key
    for (iLoop=0; iLoop<AES_BLOCK_SIZE; iLoop++) 
    {
        iv[iLoop] = 0;
    }

    if (AES_set_encrypt_key(key, 128, &aes) < 0) 
    {
        return ;
    }

    iLen = strlen(source_string)+1;

   AES_cbc_encrypt(source_string, des_string, iLen, &aes, iv, AES_ENCRYPT);

}
void aes_box_decrypt(unsigned char* source_string, unsigned char* des_string)
{
    int iLoop = 0;
    int iLen =0;
    AES_KEY aes;
    unsigned char key[AES_BLOCK_SIZE];
    unsigned char iv[AES_BLOCK_SIZE];
    if(NULL == source_string || NULL == des_string)
    {
        return;
    }

    //Generate own AES Key
     memcpy(key,"1234567890123456",AES_BLOCK_SIZE);

    // Set encryption key
    for (iLoop=0; iLoop<AES_BLOCK_SIZE; iLoop++) 
    {
        iv[iLoop] = 0;
    }

    if (AES_set_decrypt_key(key, 128, &aes) < 0) 
    {
        return ;
    }

    iLen = strlen(source_string)+1;

   AES_cbc_encrypt(source_string, des_string, iLen, &aes, iv, AES_DECRYPT);
}
int main(int argc,char *argv[]) 
{
    unsigned char ucIsEncrypt = 3;  
    unsigned char sourceStringTemp[100];
    unsigned char dstStringTemp[100];
    unsigned char printString[100];
    unsigned long ulBase64SrcLen = 0;
    unsigned long ulBase64DstLen = 100;

    memset(sourceStringTemp, 0 ,100);
    memset(dstStringTemp, 0 ,100);
    memset(printString, 0, 100);


    strcpy((char*)sourceStringTemp, argv[1]);
    ucIsEncrypt = atoi(argv[2]);

    if(AES_ENCRYPT == ucIsEncrypt)
    {
        aes_box_encrypt(sourceStringTemp,dstStringTemp);

        ulBase64SrcLen = strlen(dstStringTemp);        
        Base64Encode(dstStringTemp, ulBase64SrcLen , printString, &ulBase64DstLen);
        printf("%s\r\n", printString);

    }
    else if(AES_DECRYPT == ucIsEncrypt)
    {        
        ulBase64SrcLen = strlen(sourceStringTemp);        
        Base64Decode(sourceStringTemp, ulBase64SrcLen, printString, &ulBase64DstLen);        
        aes_box_decrypt(printString,dstStringTemp);

        printf("%s\r\n", dstStringTemp);
    }    

    return 0;
}

关于带参数main函数使用问题： 

gcc AESPassword.c -o AESPassword

./AESPassword icd 1

window下VS2008编译通过

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "openssl/aes.h"

#include "openssl/pem.h"
#include "openssl/bio.h"
#include "openssl/evp.h"
#pragma comment(lib, "4758cca.lib")
#pragma comment(lib, "aep.lib")
#pragma comment(lib, "atalla.lib")
#pragma comment(lib, "4758cca.lib")
#pragma comment(lib, "chil.lib")
#pragma comment(lib, "capi.lib")
#pragma comment(lib, "cswift.lib")
#pragma comment(lib, "gmp.lib")
#pragma comment(lib, "libeay32.lib")
#pragma comment(lib, "nuron.lib")
#pragma comment(lib, "padlock.lib")
#pragma comment(lib, "ssleay32.lib")
#pragma comment(lib, "gost.lib")
#pragma comment(lib, "sureware.lib")
#pragma comment(lib, "ubsec.lib")


void Base64Encode(unsigned char *inputString, int inLen, unsigned char *outputString, int *outLen)
{    
BIO *bmem = NULL;
BIO *b64 = NULL;
BUF_MEM *bptr = NULL;
if ((NULL == inputString) ||
(NULL == outputString))
{
return;
}  

b64 = BIO_new(BIO_f_base64());
bmem = BIO_new(BIO_s_mem());
b64 = BIO_push(b64, bmem);

BIO_write(b64, inputString, inLen);
BIO_flush(b64);
BIO_get_mem_ptr(b64, &bptr);
if (bptr->length > *outLen)
{
*outLen = bptr->length;
return;
}

memcpy(outputString, bptr->data, bptr->length-1);
outputString[bptr->length-1] = 0;
*outLen = bptr->length-1;
BIO_free_all(b64);
return;
}
void Base64Decode(const char* inputString, int inLen, unsigned char* outputString, int  *outLen)
{
BIO * b642 = NULL;
BIO * bmem2 = NULL;
char tmp[50 + 1];
if(NULL == inputString || NULL == outputString)
{
return;
}

tmp[inLen] = '\n';      /*Openssl demand to have '\n' to end the string.*/
memcpy(&tmp[0], inputString, inLen);
memset(outputString, 0 , *outLen);

b642 = BIO_new(BIO_f_base64());
bmem2 = BIO_new_mem_buf(&tmp[0], inLen+1);
bmem2 = BIO_push(b642, bmem2);
*outLen = BIO_read(bmem2, outputString, *outLen);
BIO_free_all(bmem2);
return ;
}

void aes_box_encrypt(unsigned char* source_string, unsigned char* des_string)
{
int iLoop = 0;
int iLen =0;
AES_KEY aes;
unsigned char key[AES_BLOCK_SIZE];
unsigned char iv[AES_BLOCK_SIZE];
if(NULL == source_string || NULL == des_string)
{
return;
}

//Generate own AES Key
memcpy(key,"1234567890123456",AES_BLOCK_SIZE);

// Set encryption key
for (iLoop=0; iLoop<AES_BLOCK_SIZE; iLoop++) 
{
iv[iLoop] = 0;
}

if (AES_set_encrypt_key(key, 128, &aes) < 0) 
{
return ;
}

iLen = strlen(source_string)+1;

AES_cbc_encrypt(source_string, des_string, iLen, &aes, iv, AES_ENCRYPT);

}
void aes_box_decrypt(unsigned char* source_string, unsigned char* des_string)
{
int iLoop = 0;
int iLen =0;
AES_KEY aes;
unsigned char key[AES_BLOCK_SIZE];
unsigned char iv[AES_BLOCK_SIZE];
if(NULL == source_string || NULL == des_string)
{
return;
}

//Generate own AES Key
memcpy(key,"1234567890123456",AES_BLOCK_SIZE);

// Set encryption key
for (iLoop=0; iLoop<AES_BLOCK_SIZE; iLoop++) 
{
iv[iLoop] = 0;
}

if (AES_set_decrypt_key(key, 128, &aes) < 0) 
{
return ;
}

iLen = strlen(source_string)+1;

AES_cbc_encrypt(source_string, des_string, iLen, &aes, iv, AES_DECRYPT);
}
int main(int argc,char *argv[]) 
{
unsigned char ucIsEncrypt = 3;  
unsigned char sourceStringTemp[100];
unsigned char dstStringTemp[100];
unsigned char printString[100];
unsigned long ulBase64SrcLen = 0;
unsigned long ulBase64DstLen = 100;
unsigned long ulPrintLen = 0;

memset(sourceStringTemp, 0 ,100);
memset(dstStringTemp, 255 ,100);
memset(printString, 0, 100);

if(argc < 2)
{
return 0;
}

strcpy((char*)sourceStringTemp, argv[1]);
ucIsEncrypt = atoi(argv[2]);

if(AES_ENCRYPT == ucIsEncrypt)
{
aes_box_encrypt(sourceStringTemp,dstStringTemp);

for (; 255!=dstStringTemp[ulBase64SrcLen]; ulBase64SrcLen++);

Base64Encode(dstStringTemp, ulBase64SrcLen , printString, &ulBase64DstLen);
printf("%s\r\n", printString);

} 
else if(AES_DECRYPT == ucIsEncrypt)
{        
ulBase64SrcLen = strlen(sourceStringTemp);        
Base64Decode(sourceStringTemp, ulBase64SrcLen, printString, &ulBase64DstLen);        
aes_box_decrypt(printString,dstStringTemp);
ulPrintLen = strlen(dstStringTemp);
dstStringTemp[ulPrintLen]='\0';

printf("%s", dstStringTemp);
}    

return 0;
}

同上，vs2008命令提示符进入AESPassword.exe当前目录：

AESPassword.exe icd 1

1为加密，0为解密
 

错误：32位机器正常运行，但是在64位机器上面有“readyX.dll”错误

工程属性——》配置属性——》C/C++——》常规——》检测64位可移植性问题

另外：

工程属性——》配置属性——》常规——》MFC的使用——》在静态库中使用MFC

 

错误：在机器中运行AESPassword.exe,出现缺少“libeay32.dll”文件

libeay32.dll文件为openssl源程序编译后的文件，将其放在AESPassword.exe同目录下即可。

 


 

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