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-rw-r--r--src/lib/libcrypto/modes/ctr128.c252
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diff --git a/src/lib/libcrypto/modes/ctr128.c b/src/lib/libcrypto/modes/ctr128.c
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1/* $OpenBSD: ctr128.c,v 1.6 2015/02/10 09:46:30 miod Exp $ */
2/* ====================================================================
3 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 */
51
52#include <openssl/crypto.h>
53#include "modes_lcl.h"
54#include <string.h>
55
56#ifndef MODES_DEBUG
57# ifndef NDEBUG
58# define NDEBUG
59# endif
60#endif
61#include <assert.h>
62
63/* NOTE: the IV/counter CTR mode is big-endian. The code itself
64 * is endian-neutral. */
65
66/* increment counter (128-bit int) by 1 */
67static void ctr128_inc(unsigned char *counter) {
68 u32 n=16;
69 u8 c;
70
71 do {
72 --n;
73 c = counter[n];
74 ++c;
75 counter[n] = c;
76 if (c) return;
77 } while (n);
78}
79
80#if !defined(OPENSSL_SMALL_FOOTPRINT)
81static void
82ctr128_inc_aligned(unsigned char *counter)
83{
84 size_t *data,c,n;
85
86 if (BYTE_ORDER == LITTLE_ENDIAN) {
87 ctr128_inc(counter);
88 return;
89 }
90
91 data = (size_t *)counter;
92 n = 16/sizeof(size_t);
93 do {
94 --n;
95 c = data[n];
96 ++c;
97 data[n] = c;
98 if (c) return;
99 } while (n);
100}
101#endif
102
103/* The input encrypted as though 128bit counter mode is being
104 * used. The extra state information to record how much of the
105 * 128bit block we have used is contained in *num, and the
106 * encrypted counter is kept in ecount_buf. Both *num and
107 * ecount_buf must be initialised with zeros before the first
108 * call to CRYPTO_ctr128_encrypt().
109 *
110 * This algorithm assumes that the counter is in the x lower bits
111 * of the IV (ivec), and that the application has full control over
112 * overflow and the rest of the IV. This implementation takes NO
113 * responsability for checking that the counter doesn't overflow
114 * into the rest of the IV when incremented.
115 */
116void CRYPTO_ctr128_encrypt(const unsigned char *in, unsigned char *out,
117 size_t len, const void *key,
118 unsigned char ivec[16], unsigned char ecount_buf[16],
119 unsigned int *num, block128_f block)
120{
121 unsigned int n;
122 size_t l=0;
123
124 assert(*num < 16);
125
126 n = *num;
127
128#if !defined(OPENSSL_SMALL_FOOTPRINT)
129 if (16%sizeof(size_t) == 0) do { /* always true actually */
130 while (n && len) {
131 *(out++) = *(in++) ^ ecount_buf[n];
132 --len;
133 n = (n+1) % 16;
134 }
135
136#ifdef __STRICT_ALIGNMENT
137 if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
138 break;
139#endif
140 while (len>=16) {
141 (*block)(ivec, ecount_buf, key);
142 ctr128_inc_aligned(ivec);
143 for (; n<16; n+=sizeof(size_t))
144 *(size_t *)(out+n) =
145 *(size_t *)(in+n) ^ *(size_t *)(ecount_buf+n);
146 len -= 16;
147 out += 16;
148 in += 16;
149 n = 0;
150 }
151 if (len) {
152 (*block)(ivec, ecount_buf, key);
153 ctr128_inc_aligned(ivec);
154 while (len--) {
155 out[n] = in[n] ^ ecount_buf[n];
156 ++n;
157 }
158 }
159 *num = n;
160 return;
161 } while(0);
162 /* the rest would be commonly eliminated by x86* compiler */
163#endif
164 while (l<len) {
165 if (n==0) {
166 (*block)(ivec, ecount_buf, key);
167 ctr128_inc(ivec);
168 }
169 out[l] = in[l] ^ ecount_buf[n];
170 ++l;
171 n = (n+1) % 16;
172 }
173
174 *num=n;
175}
176
177/* increment upper 96 bits of 128-bit counter by 1 */
178static void ctr96_inc(unsigned char *counter) {
179 u32 n=12;
180 u8 c;
181
182 do {
183 --n;
184 c = counter[n];
185 ++c;
186 counter[n] = c;
187 if (c) return;
188 } while (n);
189}
190
191void CRYPTO_ctr128_encrypt_ctr32(const unsigned char *in, unsigned char *out,
192 size_t len, const void *key,
193 unsigned char ivec[16], unsigned char ecount_buf[16],
194 unsigned int *num, ctr128_f func)
195{
196 unsigned int n,ctr32;
197
198 assert(*num < 16);
199
200 n = *num;
201
202 while (n && len) {
203 *(out++) = *(in++) ^ ecount_buf[n];
204 --len;
205 n = (n+1) % 16;
206 }
207
208 ctr32 = GETU32(ivec+12);
209 while (len>=16) {
210 size_t blocks = len/16;
211 /*
212 * 1<<28 is just a not-so-small yet not-so-large number...
213 * Below condition is practically never met, but it has to
214 * be checked for code correctness.
215 */
216 if (sizeof(size_t)>sizeof(unsigned int) && blocks>(1U<<28))
217 blocks = (1U<<28);
218 /*
219 * As (*func) operates on 32-bit counter, caller
220 * has to handle overflow. 'if' below detects the
221 * overflow, which is then handled by limiting the
222 * amount of blocks to the exact overflow point...
223 */
224 ctr32 += (u32)blocks;
225 if (ctr32 < blocks) {
226 blocks -= ctr32;
227 ctr32 = 0;
228 }
229 (*func)(in,out,blocks,key,ivec);
230 /* (*ctr) does not update ivec, caller does: */
231 PUTU32(ivec+12,ctr32);
232 /* ... overflow was detected, propogate carry. */
233 if (ctr32 == 0) ctr96_inc(ivec);
234 blocks *= 16;
235 len -= blocks;
236 out += blocks;
237 in += blocks;
238 }
239 if (len) {
240 memset(ecount_buf,0,16);
241 (*func)(ecount_buf,ecount_buf,1,key,ivec);
242 ++ctr32;
243 PUTU32(ivec+12,ctr32);
244 if (ctr32 == 0) ctr96_inc(ivec);
245 while (len--) {
246 out[n] = in[n] ^ ecount_buf[n];
247 ++n;
248 }
249 }
250
251 *num=n;
252}
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