Hello list,
I'm new here, I'm trying to encrypt / decrypt text in a file using the rc4,
the problem is that I'm not getting good results, here's what I'm doing for
encryption:
#include <stdio.h>
#include <stdlib.h>
#include <openssl/bio.h>
#include <openssl/evp.h>
int main(void)
{
char buf[1024];
int total, len, written;
BIO *file = BIO_new_file("out.bin", "w");
BIO *buffer = BIO_new(BIO_f_buffer());
BIO *cipher = BIO_new(BIO_f_cipher());
strcpy(buf, "Simple Text to Encrypt");
BIO_set_cipher(cipher, EVP_rc4(), "mysecretkey", NULL, 1);
BIO_push (cipher, buffer);
BIO_push (buffer, file);
len = strlen(buf);
written = 0;
for (total = 0; total < len; total += written) {
if ((written = BIO_write(cipher, buf + total, len - total)) <=
0) {
if (BIO_should_retry(cipher)) {
written =0;
continue;
}
break;
}
}
BIO_flush(cipher);
BIO_free_all(cipher);
}
compiled it, and when executed I get a out.bin, then when I try to decrypt it
it fails:
$ openssl enc -d -rc4 -in out.bin -k mysecretkey
bad magic number
what I'm I doing wrong? maybe the -k -K -iv options? as BIO_set_cipher as well
maybe?
Regards and thank for your time
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