1 | /* $NetBSD: aesxcbcmac.c,v 1.2 2016/09/26 14:50:54 christos Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (C) 1995, 1996, 1997, 1998 and 2003 WIDE Project. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * 3. Neither the name of the project nor the names of its contributors |
16 | * may be used to endorse or promote products derived from this software |
17 | * without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 | * SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/cdefs.h> |
33 | __KERNEL_RCSID(0, "$NetBSD: aesxcbcmac.c,v 1.2 2016/09/26 14:50:54 christos Exp $" ); |
34 | |
35 | #include <sys/param.h> |
36 | #include <sys/systm.h> |
37 | #include <crypto/rijndael/rijndael.h> |
38 | |
39 | #include <opencrypto/aesxcbcmac.h> |
40 | |
41 | int |
42 | aes_xcbc_mac_init(void *vctx, const uint8_t *key, u_int16_t keylen) |
43 | { |
44 | static const uint8_t k1seed[AES_BLOCKSIZE] = |
45 | { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 }; |
46 | static const uint8_t k2seed[AES_BLOCKSIZE] = |
47 | { 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 }; |
48 | static const uint8_t k3seed[AES_BLOCKSIZE] = |
49 | { 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 }; |
50 | u_int32_t r_ks[(RIJNDAEL_MAXNR+1)*4]; |
51 | aesxcbc_ctx *ctx; |
52 | uint8_t k1[AES_BLOCKSIZE]; |
53 | |
54 | ctx = vctx; |
55 | memset(ctx, 0, sizeof(*ctx)); |
56 | |
57 | if ((ctx->r_nr = rijndaelKeySetupEnc(r_ks, key, keylen * 8)) == 0) |
58 | return -1; |
59 | rijndaelEncrypt(r_ks, ctx->r_nr, k1seed, k1); |
60 | rijndaelEncrypt(r_ks, ctx->r_nr, k2seed, ctx->k2); |
61 | rijndaelEncrypt(r_ks, ctx->r_nr, k3seed, ctx->k3); |
62 | if (rijndaelKeySetupEnc(ctx->r_k1s, k1, AES_BLOCKSIZE * 8) == 0) |
63 | return -1; |
64 | if (rijndaelKeySetupEnc(ctx->r_k2s, ctx->k2, AES_BLOCKSIZE * 8) == 0) |
65 | return -1; |
66 | if (rijndaelKeySetupEnc(ctx->r_k3s, ctx->k3, AES_BLOCKSIZE * 8) == 0) |
67 | return -1; |
68 | |
69 | return 0; |
70 | } |
71 | |
72 | int |
73 | aes_xcbc_mac_loop(void *vctx, const uint8_t *addr, u_int16_t len) |
74 | { |
75 | uint8_t buf[AES_BLOCKSIZE]; |
76 | aesxcbc_ctx *ctx; |
77 | const uint8_t *ep; |
78 | int i; |
79 | |
80 | ctx = vctx; |
81 | ep = addr + len; |
82 | |
83 | if (ctx->buflen == sizeof(ctx->buf)) { |
84 | for (i = 0; i < sizeof(ctx->e); i++) |
85 | ctx->buf[i] ^= ctx->e[i]; |
86 | rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, ctx->e); |
87 | ctx->buflen = 0; |
88 | } |
89 | if (ctx->buflen + len < sizeof(ctx->buf)) { |
90 | memcpy(ctx->buf + ctx->buflen, addr, len); |
91 | ctx->buflen += len; |
92 | return 0; |
93 | } |
94 | if (ctx->buflen && ctx->buflen + len > sizeof(ctx->buf)) { |
95 | memcpy(ctx->buf + ctx->buflen, addr, |
96 | sizeof(ctx->buf) - ctx->buflen); |
97 | for (i = 0; i < sizeof(ctx->e); i++) |
98 | ctx->buf[i] ^= ctx->e[i]; |
99 | rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, ctx->e); |
100 | addr += sizeof(ctx->buf) - ctx->buflen; |
101 | ctx->buflen = 0; |
102 | } |
103 | /* due to the special processing for M[n], "=" case is not included */ |
104 | while (ep - addr > AES_BLOCKSIZE) { |
105 | memcpy(buf, addr, AES_BLOCKSIZE); |
106 | for (i = 0; i < sizeof(buf); i++) |
107 | buf[i] ^= ctx->e[i]; |
108 | rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, buf, ctx->e); |
109 | addr += AES_BLOCKSIZE; |
110 | } |
111 | if (addr < ep) { |
112 | memcpy(ctx->buf + ctx->buflen, addr, ep - addr); |
113 | ctx->buflen += ep - addr; |
114 | } |
115 | return 0; |
116 | } |
117 | |
118 | void |
119 | aes_xcbc_mac_result(uint8_t *addr, void *vctx) |
120 | { |
121 | uint8_t digest[AES_BLOCKSIZE]; |
122 | aesxcbc_ctx *ctx; |
123 | int i; |
124 | |
125 | ctx = vctx; |
126 | |
127 | if (ctx->buflen == sizeof(ctx->buf)) { |
128 | for (i = 0; i < sizeof(ctx->buf); i++) { |
129 | ctx->buf[i] ^= ctx->e[i]; |
130 | ctx->buf[i] ^= ctx->k2[i]; |
131 | } |
132 | rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, digest); |
133 | } else { |
134 | for (i = ctx->buflen; i < sizeof(ctx->buf); i++) |
135 | ctx->buf[i] = (i == ctx->buflen) ? 0x80 : 0x00; |
136 | for (i = 0; i < sizeof(ctx->buf); i++) { |
137 | ctx->buf[i] ^= ctx->e[i]; |
138 | ctx->buf[i] ^= ctx->k3[i]; |
139 | } |
140 | rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, digest); |
141 | } |
142 | |
143 | memcpy(addr, digest, sizeof(digest)); |
144 | } |
145 | |