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/*
* aes.c: interface to AES cipher
*
* Written By Matthew Green
*
* Copyright (c) 2000-2014 Matthew R. Green.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* XXX THIS DOES NOT WORK XXX */
IRCII_RCSID_NAMED("@(#)$eterna: aes.c,v 1.9 2020/11/17 08:24:32 mrg Exp $", aes_rcsid);
#include "rijndael-api-ref.h"
#define RJBITS 128
#define RJLEN RJBITS / 4
typedef struct {
rijndael_keyInstance k0;
rijndael_keyInstance k1;
rijndael_cipherInstance c;
} aeskey;
static int aes_decrypt_str(crypt_key *, u_char **, size_t *);
static int aes_encrypt_str(crypt_key *, u_char **, size_t *);
static int aes_setkey(crypt_key *, size_t, u_char *);
static void makehex(u_char *, u_char *, size_t, u_int);
#define MAKEHEX_ALPHA 0x1
static void
makehex(u_char *s, u_char *d, size_t len, u_int flags)
{
for (; len > 0; len -= ((flags & MAKEHEX_ALPHA) ? 1 : 2), d++)
if ((flags & MAKEHEX_ALPHA) == 0)
snprintf(d++, len, "%02x", *s++);
else
snprintf(d, len, "%01x", *s++ & 0xf);
}
static int
aes_setkey(crypt_key *key, size_t len, u_char *IV)
{
aeskey *k;
u_char keypad[RJLEN + 1];
u_char keymat[RJLEN + 1];
u_char IVmat[RJLEN + 1];
int rv;
if (key->cookie)
{
/*yell("aes_setkey: key-cookie not null; freeing.");*/
new_free(&key->cookie);
}
key->cookie = k = new_malloc(sizeof *k);
if (len > sizeof(keypad))
len = sizeof(keypad);
memcpy(keypad, key->key, len);
if (len != sizeof(keypad))
memset(keypad, 0, sizeof(keypad) - len);
makehex(keypad, keymat, RJLEN, MAKEHEX_ALPHA);
keymat[sizeof(keymat) - 1] = '\0';
makehex(IV, IVmat, RJLEN, 0);
memset(&k->c, 0, sizeof(k->c));
rv = rijndael_cipherInit(&k->c, MODE_CBC, IVmat);
if (rv < 0)
return -1;
k->c.blockLen = RJBITS;
rv = rijndael_makeKey(&k->k0, DIR_DECRYPT, RJBITS, keymat);
if (rv < 0)
return -2;
rv = rijndael_makeKey(&k->k1, DIR_ENCRYPT, RJBITS, keymat);
if (rv < 0)
return -3;
return 0;
}
static int
aes_decrypt_str(crypt_key *key, u_char **str, size_t len)
{
aeskey *k;
u_char *s = *str;
int adj;
int rv;
if (key->cookie == NULL)
{
rv = aes_setkey(key, my_strlen(key->key), s);
if (rv < 0)
goto bad;
adj = RJLEN / 2;
}
else
adj = 0;
k = key->cookie;
rv = rijndael_blockDecrypt(&k->c, &k->k0, s + adj, *len * 8, s);
if (rv < 0)
goto bad;
return (0);
bad:
new_free(&key->cookie);
*s = '\0';
return (rv);
}
static int
aes_encrypt_str(crypt_key *key, u_char **str, size_t len)
{
aeskey *k;
int rv, i;
u_char IV[RJLEN + 1];
u_char *s, *d;
if (key->cookie == NULL)
{
crypt_get_random_data(IV, sizeof IV);
rv = aes_setkey(key, my_strlen(key->key), s);
if (rv < 0)
goto bad;
s = *str;
*str = new_malloc(*len + (RJLEN / 2) + 1);
k = key->cookie;
memcpy(*str, k->c.IV, RJLEN / 2);
d = *str + RJLEN;
}
else
{
d = s = *str;
k = key->cookie;
}
rv = rijndael_blockEncrypt(&k->c, &k->k1, s, *len * 8, d);
if (s != d)
*len += (RJLEN / 2);
/*yell("--- after encrypt, rv = %d, d == `%s' *len = %d *str = `%s'", rv, d, *len, *str);*/
if (rv < 0)
goto bad;
return (0);
bad:
new_free(&key->cookie);
**str = '\0';
return (rv);
}
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