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Diffstat (limited to 'src/lib/libcrypto/cmac/cmac.c')
-rw-r--r--src/lib/libcrypto/cmac/cmac.c281
1 files changed, 0 insertions, 281 deletions
diff --git a/src/lib/libcrypto/cmac/cmac.c b/src/lib/libcrypto/cmac/cmac.c
deleted file mode 100644
index 18635b942a..0000000000
--- a/src/lib/libcrypto/cmac/cmac.c
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@@ -1,281 +0,0 @@
1/* $OpenBSD: cmac.c,v 1.9 2014/07/12 14:58:32 miod Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project.
4 */
5/* ====================================================================
6 * Copyright (c) 2010 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 */
53
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57
58#include <openssl/cmac.h>
59
60struct CMAC_CTX_st {
61 /* Cipher context to use */
62 EVP_CIPHER_CTX cctx;
63 /* Keys k1 and k2 */
64 unsigned char k1[EVP_MAX_BLOCK_LENGTH];
65 unsigned char k2[EVP_MAX_BLOCK_LENGTH];
66 /* Temporary block */
67 unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
68 /* Last (possibly partial) block */
69 unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
70 /* Number of bytes in last block: -1 means context not initialised */
71 int nlast_block;
72};
73
74
75/* Make temporary keys K1 and K2 */
76
77static void
78make_kn(unsigned char *k1, unsigned char *l, int bl)
79{
80 int i;
81
82 /* Shift block to left, including carry */
83 for (i = 0; i < bl; i++) {
84 k1[i] = l[i] << 1;
85 if (i < bl - 1 && l[i + 1] & 0x80)
86 k1[i] |= 1;
87 }
88 /* If MSB set fixup with R */
89 if (l[0] & 0x80)
90 k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b;
91}
92
93CMAC_CTX *
94CMAC_CTX_new(void)
95{
96 CMAC_CTX *ctx;
97
98 ctx = malloc(sizeof(CMAC_CTX));
99 if (!ctx)
100 return NULL;
101 EVP_CIPHER_CTX_init(&ctx->cctx);
102 ctx->nlast_block = -1;
103 return ctx;
104}
105
106void
107CMAC_CTX_cleanup(CMAC_CTX *ctx)
108{
109 EVP_CIPHER_CTX_cleanup(&ctx->cctx);
110 OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
111 OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH);
112 OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH);
113 OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
114 ctx->nlast_block = -1;
115}
116
117EVP_CIPHER_CTX *
118CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx)
119{
120 return &ctx->cctx;
121}
122
123void
124CMAC_CTX_free(CMAC_CTX *ctx)
125{
126 if (ctx == NULL)
127 return;
128
129 CMAC_CTX_cleanup(ctx);
130 free(ctx);
131}
132
133int
134CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in)
135{
136 int bl;
137
138 if (in->nlast_block == -1)
139 return 0;
140 if (!EVP_CIPHER_CTX_copy(&out->cctx, &in->cctx))
141 return 0;
142 bl = EVP_CIPHER_CTX_block_size(&in->cctx);
143 memcpy(out->k1, in->k1, bl);
144 memcpy(out->k2, in->k2, bl);
145 memcpy(out->tbl, in->tbl, bl);
146 memcpy(out->last_block, in->last_block, bl);
147 out->nlast_block = in->nlast_block;
148 return 1;
149}
150
151int
152CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
153 const EVP_CIPHER *cipher, ENGINE *impl)
154{
155 static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH];
156
157 /* All zeros means restart */
158 if (!key && !cipher && !impl && keylen == 0) {
159 /* Not initialised */
160 if (ctx->nlast_block == -1)
161 return 0;
162 if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
163 return 0;
164 memset(ctx->tbl, 0, EVP_CIPHER_CTX_block_size(&ctx->cctx));
165 ctx->nlast_block = 0;
166 return 1;
167 }
168 /* Initialiase context */
169 if (cipher && !EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL))
170 return 0;
171 /* Non-NULL key means initialisation complete */
172 if (key) {
173 int bl;
174
175 if (!EVP_CIPHER_CTX_cipher(&ctx->cctx))
176 return 0;
177 if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
178 return 0;
179 if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
180 return 0;
181 bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
182 if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl))
183 return 0;
184 make_kn(ctx->k1, ctx->tbl, bl);
185 make_kn(ctx->k2, ctx->k1, bl);
186 OPENSSL_cleanse(ctx->tbl, bl);
187 /* Reset context again ready for first data block */
188 if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
189 return 0;
190 /* Zero tbl so resume works */
191 memset(ctx->tbl, 0, bl);
192 ctx->nlast_block = 0;
193 }
194 return 1;
195}
196
197int
198CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
199{
200 const unsigned char *data = in;
201 size_t bl;
202
203 if (ctx->nlast_block == -1)
204 return 0;
205 if (dlen == 0)
206 return 1;
207 bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
208 /* Copy into partial block if we need to */
209 if (ctx->nlast_block > 0) {
210 size_t nleft;
211
212 nleft = bl - ctx->nlast_block;
213 if (dlen < nleft)
214 nleft = dlen;
215 memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
216 dlen -= nleft;
217 ctx->nlast_block += nleft;
218 /* If no more to process return */
219 if (dlen == 0)
220 return 1;
221 data += nleft;
222 /* Else not final block so encrypt it */
223 if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block, bl))
224 return 0;
225 }
226 /* Encrypt all but one of the complete blocks left */
227 while (dlen > bl) {
228 if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl))
229 return 0;
230 dlen -= bl;
231 data += bl;
232 }
233 /* Copy any data left to last block buffer */
234 memcpy(ctx->last_block, data, dlen);
235 ctx->nlast_block = dlen;
236 return 1;
237}
238
239int
240CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen)
241{
242 int i, bl, lb;
243
244 if (ctx->nlast_block == -1)
245 return 0;
246 bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
247 *poutlen = (size_t)bl;
248 if (!out)
249 return 1;
250 lb = ctx->nlast_block;
251 /* Is last block complete? */
252 if (lb == bl) {
253 for (i = 0; i < bl; i++)
254 out[i] = ctx->last_block[i] ^ ctx->k1[i];
255 } else {
256 ctx->last_block[lb] = 0x80;
257 if (bl - lb > 1)
258 memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
259 for (i = 0; i < bl; i++)
260 out[i] = ctx->last_block[i] ^ ctx->k2[i];
261 }
262 if (!EVP_Cipher(&ctx->cctx, out, out, bl)) {
263 OPENSSL_cleanse(out, bl);
264 return 0;
265 }
266 return 1;
267}
268
269int
270CMAC_resume(CMAC_CTX *ctx)
271{
272 if (ctx->nlast_block == -1)
273 return 0;
274 /* The buffer "tbl" containes the last fully encrypted block
275 * which is the last IV (or all zeroes if no last encrypted block).
276 * The last block has not been modified since CMAC_final().
277 * So reinitialising using the last decrypted block will allow
278 * CMAC to continue after calling CMAC_Final().
279 */
280 return EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl);
281}
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