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encrypt.c
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encrypt.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#include <time.h>
#include <signal.h>
#include <pwd.h>
#include <openssl/md5.h>
#include <openssl/aes.h>
#include <openssl/sha.h>
#include "util.h"
#include "inp.h"
char key_text[100];
char iv_text[100];
void encrypt_load()
{
struct inp_file inp;
inp_init(&inp);
if (inp_load(&inp,"crypto.inp")!=0)
{
printf("can't find file crypto.inp");
exit(0);
}
inp_check(&inp,1.0);
inp_search_string(&inp,iv_text,"#iv");
inp_search_string(&inp,key_text,"#key");
inp_free(&inp);
}
void encrypt(char *data,int round_len)
{
char *out=malloc(sizeof(char)*round_len);
int key_len=16;
memset(out, 0, round_len);
//memset(buf, 0, round_len);
//memcpy (buf, in, len );
unsigned char IV[key_len];
unsigned char key[key_len];
MD5((const unsigned char*)key_text, strlen(key_text),(unsigned char *)key);
MD5((const unsigned char*)iv_text, strlen(iv_text),(unsigned char *)IV);
AES_KEY aeskey;
AES_set_encrypt_key(key, key_len*8, &aeskey);
AES_cbc_encrypt( data,out, round_len, &aeskey, IV, AES_ENCRYPT);
memcpy (data, out, round_len );
//printf("decrypted: '%s'\n",data);
free(out);
}
void decrypt(char *data,int round_len)
{
char *out=malloc(sizeof(char)*round_len);
int key_len=16;
memset(out, 0, round_len);
//memset(buf, 0, round_len);
//memcpy (buf, in, len );
unsigned char IV[key_len];
unsigned char key[key_len];
MD5((const unsigned char*)key_text, strlen(key_text),(unsigned char *)key);
MD5((const unsigned char*)iv_text, strlen(iv_text),(unsigned char *)IV);
AES_KEY aeskey;
AES_set_decrypt_key(key, key_len*8, &aeskey);
AES_cbc_encrypt(data,out, round_len, &aeskey, IV, AES_DECRYPT);
memcpy (data, out, round_len );
//printf("decrypted: '%s'\n",data);
free(out);
}