libkern/crypto/corecrypto_des.c

   1 /*
   2  * Copyright (c) 2012 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29
  30 #include <libkern/crypto/crypto_internal.h>
  31 #include <libkern/libkern.h>
  32 #include <kern/debug.h>
  33 #include <libkern/crypto/des.h>
  34 #include <corecrypto/ccmode.h>
  35
  36 /* Single DES ECB - used by ipv6 (esp_core.c) */
  37 int
  38 des_ecb_key_sched(des_cblock *key, des_ecb_key_schedule *ks)
  39 {
  40         const struct ccmode_ecb *enc = g_crypto_funcs->ccdes_ecb_encrypt;
  41         const struct ccmode_ecb *dec = g_crypto_funcs->ccdes_ecb_decrypt;
  42
  43         /* Make sure the context size for the mode fits in the one we have */
  44         if ((enc->size > sizeof(ks->enc)) || (dec->size > sizeof(ks->dec))) {
  45                 panic("%s: inconsistent size for DES-ECB context", __FUNCTION__);
  46         }
  47
  48         int rc = enc->init(enc, ks->enc, CCDES_KEY_SIZE, key);
  49         if (rc) {
  50                 return rc;
  51         }
  52
  53         return dec->init(dec, ks->dec, CCDES_KEY_SIZE, key);
  54 }
  55
  56 /* Simple des - 1 block */
  57 int
  58 des_ecb_encrypt(des_cblock *in, des_cblock *out, des_ecb_key_schedule *ks, int enc)
  59 {
  60         const struct ccmode_ecb *ecb = enc ? g_crypto_funcs->ccdes_ecb_encrypt : g_crypto_funcs->ccdes_ecb_decrypt;
  61         ccecb_ctx *ctx = enc ? ks->enc : ks->dec;
  62
  63         return ecb->ecb(ctx, 1, in, out);
  64 }
  65
  66
  67 /* Triple DES ECB - used by ipv6 (esp_core.c) */
  68 int
  69 des3_ecb_key_sched(des_cblock *key, des3_ecb_key_schedule *ks)
  70 {
  71         const struct ccmode_ecb *enc = g_crypto_funcs->cctdes_ecb_encrypt;
  72         const struct ccmode_ecb *dec = g_crypto_funcs->cctdes_ecb_decrypt;
  73
  74         /* Make sure the context size for the mode fits in the one we have */
  75         if ((enc->size > sizeof(ks->enc)) || (dec->size > sizeof(ks->dec))) {
  76                 panic("%s: inconsistent size for 3DES-ECB context", __FUNCTION__);
  77         }
  78
  79         int rc = enc->init(enc, ks->enc, CCDES_KEY_SIZE * 3, key);
  80         if (rc) {
  81                 return rc;
  82         }
  83
  84         return dec->init(dec, ks->dec, CCDES_KEY_SIZE * 3, key);
  85 }
  86
  87 /* Simple des - 1 block */
  88 int
  89 des3_ecb_encrypt(des_cblock *in, des_cblock *out, des3_ecb_key_schedule *ks, int enc)
  90 {
  91         const struct ccmode_ecb *ecb = enc ? g_crypto_funcs->cctdes_ecb_encrypt : g_crypto_funcs->cctdes_ecb_decrypt;
  92         ccecb_ctx *ctx = enc ? ks->enc : ks->dec;
  93
  94         return ecb->ecb(ctx, 1, in, out);
  95 }
  96
  97 /* Raw key helper functions */
  98
  99 int
 100 des_is_weak_key(des_cblock *key)
 101 {
 102         return g_crypto_funcs->ccdes_key_is_weak_fn(key, CCDES_KEY_SIZE);
 103 }