1 | /* |
2 | * des_crypt.c, DES encryption library routines |
3 | * Copyright (c) 2010, Oracle America, Inc. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions are |
7 | * met: |
8 | * |
9 | * * Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * * Redistributions in binary form must reproduce the above |
12 | * copyright notice, this list of conditions and the following |
13 | * disclaimer in the documentation and/or other materials |
14 | * provided with the distribution. |
15 | * * Neither the name of the "Oracle America, Inc." nor the names of its |
16 | * contributors may be used to endorse or promote products derived |
17 | * from this software without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
22 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
23 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
24 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
26 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
28 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
29 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
31 | */ |
32 | |
33 | #include <sys/types.h> |
34 | #include <rpc/des_crypt.h> |
35 | #include <shlib-compat.h> |
36 | #include "des.h" |
37 | |
38 | extern int _des_crypt (char *, unsigned, struct desparams *); |
39 | |
40 | /* |
41 | * Copy 8 bytes |
42 | */ |
43 | #define COPY8(src, dst) { \ |
44 | register char *a = (char *) dst; \ |
45 | register char *b = (char *) src; \ |
46 | *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \ |
47 | *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \ |
48 | } |
49 | |
50 | /* |
51 | * Copy multiple of 8 bytes |
52 | */ |
53 | #define DESCOPY(src, dst, len) { \ |
54 | register char *a = (char *) dst; \ |
55 | register char *b = (char *) src; \ |
56 | register int i; \ |
57 | for (i = (int) len; i > 0; i -= 8) { \ |
58 | *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \ |
59 | *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \ |
60 | } \ |
61 | } |
62 | |
63 | /* |
64 | * Common code to cbc_crypt() & ecb_crypt() |
65 | */ |
66 | static int |
67 | common_crypt (char *key, char *buf, register unsigned len, |
68 | unsigned mode, register struct desparams *desp) |
69 | { |
70 | register int desdev; |
71 | |
72 | if ((len % 8) != 0 || len > DES_MAXDATA) |
73 | return DESERR_BADPARAM; |
74 | |
75 | desp->des_dir = |
76 | ((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT; |
77 | |
78 | desdev = mode & DES_DEVMASK; |
79 | COPY8 (key, desp->des_key); |
80 | /* |
81 | * software |
82 | */ |
83 | if (!_des_crypt (buf, len, desp)) |
84 | return DESERR_HWERROR; |
85 | |
86 | return desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE; |
87 | } |
88 | |
89 | /* Note: these cannot be excluded from the build yet, because they are |
90 | still used internally. */ |
91 | |
92 | /* |
93 | * CBC mode encryption |
94 | */ |
95 | int |
96 | cbc_crypt (char *key, char *buf, unsigned int len, unsigned int mode, |
97 | char *ivec) |
98 | { |
99 | int err; |
100 | struct desparams dp; |
101 | |
102 | dp.des_mode = CBC; |
103 | COPY8 (ivec, dp.des_ivec); |
104 | err = common_crypt (key, buf, len, mode, &dp); |
105 | COPY8 (dp.des_ivec, ivec); |
106 | return err; |
107 | } |
108 | hidden_nolink (cbc_crypt, libc, GLIBC_2_1) |
109 | |
110 | /* |
111 | * ECB mode encryption |
112 | */ |
113 | int |
114 | ecb_crypt (char *key, char *buf, unsigned int len, unsigned int mode) |
115 | { |
116 | struct desparams dp; |
117 | |
118 | dp.des_mode = ECB; |
119 | return common_crypt (key, buf, len, mode, &dp); |
120 | } |
121 | hidden_nolink (ecb_crypt, libc, GLIBC_2_1) |
122 | |