OpenSSL AES-CBC encryption is implemented via C + +

Encryption is required for recent work, and symmetric encryption is used for data within the program, so AES encryption is employed. Nonsense not much to say, directly on the code

Bob_aes.h

#ifndef bob_aes_h#define bob_aes_h#include <iostream> #include <stdio.h> #include <string> #include <string.h> #include <cstdlib> #include <openssl/aes.h>class bobaes{public:bobaes (); ~bobaes (); STD: : String Aes_encrypt (std::string msg), std::string aes_decrypt (std::string msg);p rivate:int Msg_len;char Key[AES_BLOCK _size];}; #endif

Bob_aes.cpp

#include   "Bob_aes.h" Bobaes::bobaes ():  msg_len (0) {for (int i = 0; i <  aes_block_size; i++) {key[i] = 32 + i;}} Bobaes::~bobaes () {}std::string bobaes::aes_encrypt (std::string msg) {int i = msg.size ( )  / 1024; msg_len =  ( i + 1 )  * 1024;//msg_len = msg.size ()  +  16;char in[msg_len];char out[msg_len+16];memset ((char*) in,0,msg_len); memset (char*) out,0,MSG_ LEN+16); strncpy ((char*) in,msg.c_str (), msg.size ()); unsigned char iv[aes_block_size]; // Encrypted initialization vector for (int j = 0; j < aes_block_size; ++j) {iv[j] = 0;} Aes_key aes;if (Aes_set_encrypt_key ((unsigned char*) key, 128, &aes)  < 0) { Return null;} Int len = msg.size (); Aes_cbc_encrypt ((unsigned char*) in, (unsigned char*) out,len,&aes,iv,aes_encrypt); std::string  Encrypt_msg (&out[0],&out[msg_len+16]); for (int i= 0;out[i];i++) {         printf ("%x", (Unsigned char) out[i]);         //std::cout << dstStringTemp[i];    }std::cout <<  Std::endl;return encrypt_msg;} Std::string bobaes::aes_decrypt (std::string msg) {msg_len = msg.size (); Char in[MSG_LEN ];char out[msg_len+16];memset ((char*) in,0,msg_len); memset ((char*) out,0,msg_len+16); strncpy ((char*) in, Msg.c_str (), msg.size ()); for (int i= 0;in[i];i++) {         printf ("%x", (Unsigned char) in[i]);        //std::cout < < dststringtemp[i];    }std::cout << std::endl;unsigned char  iv[aes_block_size]; //encrypted initialization vector for (int j = 0; j < aes_block_sizE;&NBSP;++J) {iv[j] = 0;} Aes_key aes;if (Aes_set_decrypt_key ((unsigned char*) key, 128, &aes)  < 0) { Return null;} Int len = msg.size (); Aes_cbc_encrypt ((unsigned char*) in, (unsigned char*) out,len,&aes,iv,aes_decrypt); std::string  decrypt_msg = out;return decrypt_msg;}

This code still has some problems, for the byte within 96 of the string can be encrypted decryption succeeds, but 96 and more bytes of string encryption decryption will appear garbled, for this aspect I still novice, ask the great gods to correct a lot.

OpenSSL AES-CBC encryption is implemented via C + +