Hello all,
the given below is the code I have made on encryption and Decryption of
text file but I am not getting the same output in original So please let
me know if anybody have idea on it.
encryption code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <openssl/aes.h>
#include <openssl/rand.h>
// a simple hex-print routine. could be modified to print 16 bytes-per-line
static void hex_print(const void* pv, size_t len)
{
const unsigned char * p = (const unsigned char*)pv;
if (NULL == pv)
printf("NULL");
else
{
size_t i = 0;
for (; i<len;++i)
printf("%02X ", *p++);
}
printf("\n");
}
FILE *inpointer,*outpointer;
struct stat st;
// main entrypoint
int main(int argc, char **argv)
{
int size,keylength;
unsigned char ckey[] = "thiskeyisverybad";
unsigned char ivec[] = "dontusethisinput";
stat("input.txt", &st);
size = st.st_size;
printf("size is %d \n",size);
inpointer=fopen("input.txt","r");
outpointer=fopen("encryptinput.txt","w");
AES_KEY enc_key;
AES_set_encrypt_key(ckey, 128, &enc_key);
const size_t encslength = ((size + AES_BLOCK_SIZE) / AES_BLOCK_SIZE) *
AES_BLOCK_SIZE;
unsigned char indata[size];
unsigned char outdata[encslength];
memset(indata,0,sizeof(indata));
fread(indata,size,1, inpointer);
memset(outdata,0,sizeof(outdata));
AES_cbc_encrypt(indata, outdata,size,&enc_key,ivec,AES_ENCRYPT);
fwrite(outdata,sizeof(outdata),1,outpointer);
printf("original:\t");
hex_print(indata, sizeof(indata));
printf("encrypt:\t");
hex_print(outdata, sizeof(outdata));
fclose(inpointer);
fclose(outpointer);
return 0;
}
Decryption code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <openssl/aes.h>
#include <openssl/rand.h>
// a simple hex-print routine. could be modified to print 16 bytes-per-line
static void hex_print(const void* pv, size_t len)
{
const unsigned char * p = (const unsigned char*)pv;
if (NULL == pv)
printf("NULL");
else
{
size_t i = 0;
for (; i<len;++i)
printf("%02X ", *p++);
}
printf("\n");
}
FILE *inpointer,*outpointer;
struct stat st;
// main entrypoint
int main(int argc, char **argv)
{
int size,keylength;
unsigned char ckey[] = "thiskeyisverybad";
unsigned char ivec[] = "dontusethisinput";
stat("input.txt", &st);
size = st.st_size;
inpointer=fopen("encryptinput.txt","r");
outpointer=fopen("output.txt","w");
AES_KEY dec_key;
AES_set_encrypt_key(ckey,128,&dec_key);
const size_t encslength = ((size + AES_BLOCK_SIZE) / AES_BLOCK_SIZE) *
AES_BLOCK_SIZE;
unsigned char indata[encslength];
unsigned char outdata[size];
memset(indata,0,sizeof(indata));
fread(indata,encslength,1,inpointer);
memset(outdata,0,sizeof(outdata));
AES_cbc_encrypt(indata, outdata,encslength,&dec_key,ivec,AES_DECRYPT);
fwrite(outdata,size,1,outpointer);
printf("original:\t");
hex_print(indata, sizeof(indata));
printf("decrypt:\t");
hex_print(outdata,sizeof(outdata));
fclose(inpointer);
fclose(outpointer);
return 0;
}
encrypt output:
original plaintext: 68 65 6C 6C 6F 74 68 69 73 69 73 65 6E 63 72 69 0A
encrypt data: 3C 5D 78 9E 47 91 BD BF 55 F4 D6 D3 07 1F 0C 5C 3A 9F 88
9F 0E C6 08 32 FA 3E 7F 34 61 F5 83 28
decrypt output:
original(encrypted data): 3C 5D 78 9E 47 91 BD BF 55 F4 D6 D3 07 1F 0C
5C 3A 9F 88 9F 0E C6 08 32 FA 3E 7F 34 61 F5 83 28
decrypt: 62 20 FF DE B9 C4 3E 43 AB 04 B9 76 F8 6B 72 AA 82
here plaintext and decrypt data are not same.
Regards,
Poonam
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