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#include <openssl/aes.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
unsigned char *
aes_ofb_encrypt(unsigned char * text, int length, unsigned char * key, unsigned char * iv)
{
unsigned char * outbuf = calloc(1,length);
int num = 0;
unsigned char liv[16];
memcpy(liv,iv,16);
AES_KEY aeskey;
AES_set_encrypt_key(key, 256, &aeskey);
AES_ofb128_encrypt(text, outbuf, length, &aeskey, liv, &num);
return outbuf;
}
unsigned char *
aes_ofb_decrypt(unsigned char * enc, int length, unsigned char * key, unsigned char * iv)
{
unsigned char * outbuf= calloc(1,length);
int num = 0;
unsigned char liv[16];
memcpy(liv,iv,16);
AES_KEY aeskey;
AES_set_encrypt_key(key, 256, &aeskey);
AES_ofb128_encrypt(enc, outbuf, length, &aeskey, liv, &num);
return outbuf;
}
void main() {
unsigned char * regVal = "\xcc\x6d\xc9\x3b\xa0\xcc\x4c\x76\x55\xc9\x3b\x9f";
int regLength = 12;
unsigned char key[32] = "braantonsiteaa.webex.com/siteaab";
unsigned char iv[16] = { 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0, 0x12 };
unsigned char * password = "bradbradbrad";
int pwLength = strlen((char *)password);
unsigned char * enc = NULL;
unsigned char * enc2 = NULL;
int i = 0;
printf("Reg Key Value = ");
enc = aes_ofb_encrypt(password, pwLength, key, iv);
for(i=0;i<pwLength;i++) {
printf("%02x ", enc[i]);
}
printf("\n");
printf("Password = ");
enc2 = aes_ofb_decrypt(regVal, regLength, key, iv);
for(i=0;i<regLength;i++) {
printf("%c", enc2[i]);
}
printf("\n");
}
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