problems with blowfish

[Kilaru Sambaiah]

Hi,
  I am newbie to the cryptography.
  I am using crypto library of openssl 0.9.6b version on ReHat Linux 7.2. I 
wanted to encrypt strings. 

the code is attached. If I give strings like "aaa" for encryption it is 
giving  some junk characters. What could be the problem?

regards,
Sambaiah K
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include "blowfish.h"
#define SIZE    8
static unsigned char cbc_iv[8] = "akaa2345";
static unsigned char veckey[8] = "This is ";
void blowfish_enc(unsigned char *iinput, unsigned char *ooutput, long length, BF_KEY *bfkey,  int *num);
void blowfish_dec(unsigned char *iinput, unsigned char *ooutput, long length, BF_KEY *bfkey,int *num);

int main(int argc, char *argv[])
{
	FILE *fp;
	unsigned char *con_in, *con_out, *cbc_out;
	int n, t;
	long i = 64;
	BF_KEY key;
	BF_set_key(&key, sizeof(veckey), veckey);
	//printf("%d\n", sizeof(veckey));
    
	con_in = (unsigned char *)malloc(sizeof(char) * i);
	memset(con_in, 0, i);
	//strcpy(con_in, "this is to test more than two words.  ok !!");

    con_out = (unsigned char *)malloc(sizeof(char)*i);
    memset(con_out, 0, i);	

    cbc_out = (unsigned char *)malloc(sizeof(char)*i);
    memset(cbc_out, 0, i);

	if ( (fp = (FILE *)fopen("blowfish.dat", "rb")) != NULL )
	{
		while ( !feof(fp) )
		{
			memset(con_out, 0, i);
			memset(cbc_out, 0, i);

			if ( fgets(con_out, i, fp) != NULL )
			{
				//if ( strstr(con_out, "\n") == NULL )
				//{
					n = 0;
					t = (int)strlen(con_out)+1;
					blowfish_dec(con_out, cbc_out, t, &key, &n);
					//BF_cfb64_encrypt(con_out, cbc_out, i, &key,  iv, &n, BF_DECRYPT);

					printf("FEc(%03d,%03d): %s\n", (int)strlen(con_out), n, con_out);
					printf("FDc(%03d): %s\n", (int)strlen(cbc_out), cbc_out);
				//}
			}
			if ( feof(fp) )
				break;
		}
		fclose(fp);
	}
	else
	{
		printf("Error Opening file blowfish.dat\n");
	}

	printf("Enter String : ");
	gets(con_in);

   	printf("\nCurrent String :\n");

	n = 0;
	t = (int)strlen(con_in)+1;
	blowfish_enc(con_in, con_out, t, &key,  &n);
	//BF_cfb64_encrypt(con_in, con_out, i, &key,  iv, &n, BF_ENCRYPT);
	printf("Ori(%03d): %s\n", (int)strlen(con_in), con_in);
	printf("Enc(%03d,%03d): %s\n", (int)strlen(con_out), n, con_out);

	n=0;
	blowfish_dec(con_out, cbc_out, t, &key, &n);
	//BF_cfb64_encrypt(con_out, cbc_out, i, &key,  iv, &n, BF_DECRYPT);
	printf("Dec(%03d,%03d): %s\n", (int)strlen(cbc_out), n, cbc_out);

	if ( (fp = (FILE *)fopen("blowfish.dat", "ab")) != NULL )
	{
		fprintf(fp,"%s\n", con_out);

		fclose(fp);
	}
	else
	{
		printf("Error Opening file blowfish.dat\n");
	}


}

void blowfish_enc(unsigned char *iinput, unsigned char *ooutput, long length, BF_KEY *bfkey, int *num)
{
	unsigned char *ivec;
	ivec = (unsigned char *)malloc(sizeof(char)*SIZE);
	memcpy(ivec, cbc_iv, SIZE);
	BF_cfb64_encrypt(iinput, ooutput, length, bfkey,  ivec, num, BF_ENCRYPT);
	free(ivec);
}

void blowfish_dec(unsigned char *iinput, unsigned char *ooutput, long length, BF_KEY *bfkey, int *num)
{
	unsigned char *ivec;
	ivec = (unsigned char *)malloc(sizeof(char)*SIZE);
	memcpy(ivec, cbc_iv, SIZE);
	BF_cfb64_encrypt(iinput, ooutput, length, bfkey,  ivec, num, BF_DECRYPT);
	free(ivec);
}