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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*/
#if !defined(K_SOLARIS_PLATFORM) || defined(SOLARIS10)
#include "rijndael.h"
#else
#include <stdlib.h>
#include <aes_impl.h>
#endif
#ifdef METAWARE
#include "sizet.h"
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
typedef unsigned long long uint64_t;
#include <string.h>
#else
#ifndef WIN32
#include <strings.h>
#endif
#endif
#include "KMSAgentAESKeyWrap.h"
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifdef WIN32
#define ovbcopy(x, y, z) memmove(y, x, z);
#else
#define ovbcopy(x, y, z) bcopy(x, y, z);
#endif
#ifndef K_SOLARIS_PLATFORM
/* similar to iovec except that it accepts const pointers */
struct vector {
const void *base;
size_t len;
};
#ifdef METAWARE
#define bcopy(s1, s2, n) memcpy(s2, s1, n)
#endif
/*
* AES Key Wrap (see RFC 3394).
*/
#endif /* K_SOLARIS_PLATFORM */
static const uint8_t aes_key_wrap_iv[8] =
{ 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6 };
void aes_key_wrap (const uint8_t *kek,
size_t kek_len,
const uint8_t *pt,
size_t len,
uint8_t *ct)
{
#if !defined(K_SOLARIS_PLATFORM) || defined(SOLARIS10)
rijndael_ctx ctx;
#else
void *ks;
size_t ks_size;
#endif
uint8_t *a, *r, ar[16], t, b[16];
size_t i;
int j;
/*
* Only allow lengths for 't' values that fit within a byte. This
* covers all reasonable uses of AES Key Wrap
*/
if (len > (255 / 6)) {
return;
}
/* allow ciphertext and plaintext to overlap (ct == pt) */
ovbcopy(pt, ct + 8, len * 8);
a = ct;
memcpy(a, aes_key_wrap_iv, 8); /* default IV */
#if !defined(K_SOLARIS_PLATFORM) || defined(SOLARIS10)
rijndael_set_key_enc_only(&ctx, (uint8_t *)kek, kek_len * 8);
#else
ks = aes_alloc_keysched(&ks_size, 0);
if (ks == NULL)
return;
aes_init_keysched(kek, kek_len * 8, ks);
#endif
for (j = 0, t = 1; j < 6; j++) {
r = ct + 8;
for (i = 0; i < len; i++, t++) {
memcpy(ar, a, 8);
memcpy(ar + 8, r, 8);
#if !defined(K_SOLARIS_PLATFORM) || defined(SOLARIS10)
rijndael_encrypt(&ctx, ar, b);
#else
(void) aes_encrypt_block(ks, ar, b);
#endif
b[7] ^= t;
memcpy(a, &b[0], 8);
memcpy(r, &b[8], 8);
r += 8;
}
}
#if defined(K_SOLARIS_PLATFORM) && !defined(SOLARIS10)
free(ks);
#endif
}
int aes_key_unwrap (const uint8_t *kek,
size_t kek_len,
const uint8_t *ct,
uint8_t *pt,
size_t len)
{
#if !defined(K_SOLARIS_PLATFORM) || defined(SOLARIS10)
rijndael_ctx ctx;
#else
void *ks;
size_t ks_size;
#endif
uint8_t a[8], *r, b[16], t, ar[16];
size_t i;
int j;
/*
* Only allow lengths for 't' values that fit within a byte. This
* covers all reasonable uses of AES Key Wrap
*/
if (len > (255 / 6)) {
return (-1);
}
memcpy(a, ct, 8);
/* allow ciphertext and plaintext to overlap (ct == pt) */
ovbcopy(ct + 8, pt, len * 8);
#if !defined(K_SOLARIS_PLATFORM) || defined(SOLARIS10)
rijndael_set_key(&ctx, (uint8_t *)kek, kek_len * 8);
#else
ks = aes_alloc_keysched(&ks_size, 0);
if (ks == NULL)
return (-1);
aes_init_keysched(kek, kek_len * 8, ks);
#endif
for (j = 0, t = 6 * len; j < 6; j++) {
r = pt + (len - 1) * 8;
for (i = 0; i < len; i++, t--) {
memcpy(&ar[0], a, 8);
ar[7] ^= t;
memcpy(&ar[8], r, 8);
#if !defined(K_SOLARIS_PLATFORM) || defined(SOLARIS10)
rijndael_decrypt(&ctx, ar, b);
#else
(void) aes_decrypt_block(ks, ar, b);
#endif
memcpy(a, b, 8);
memcpy(r, b + 8, 8);
r -= 8;
}
}
#if defined(K_SOLARIS_PLATFORM) && !defined(SOLARIS10)
free(ks);
#endif
return memcmp(a, aes_key_wrap_iv, 8) != 0;
}
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