1 /*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2013, by Michael Tuexen. All rights reserved.
5 * Copyright (c) 2013, by Lally Singh. 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 are met:
9 *
10 * a) Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * b) Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the distribution.
16 *
17 * c) Neither the name of Cisco Systems, Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
31 * THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <netinet/sctp_sha1.h>
35
36 #if defined(SCTP_USE_NSS_SHA1)
37 /* A SHA-1 Digest is 160 bits, or 20 bytes */
38 #define SHA_DIGEST_LENGTH (20)
39
40 void
sctp_sha1_init(struct sctp_sha1_context * ctx)41 sctp_sha1_init(struct sctp_sha1_context *ctx)
42 {
43 ctx->pk11_ctx = PK11_CreateDigestContext(SEC_OID_SHA1);
44 PK11_DigestBegin(ctx->pk11_ctx);
45 }
46
47 void
sctp_sha1_update(struct sctp_sha1_context * ctx,const unsigned char * ptr,unsigned int siz)48 sctp_sha1_update(struct sctp_sha1_context *ctx, const unsigned char *ptr, unsigned int siz)
49 {
50 PK11_DigestOp(ctx->pk11_ctx, ptr, siz);
51 }
52
53 void
sctp_sha1_final(unsigned char * digest,struct sctp_sha1_context * ctx)54 sctp_sha1_final(unsigned char *digest, struct sctp_sha1_context *ctx)
55 {
56 unsigned int output_len = 0;
57
58 PK11_DigestFinal(ctx->pk11_ctx, digest, &output_len, SHA_DIGEST_LENGTH);
59 PK11_DestroyContext(ctx->pk11_ctx, PR_TRUE);
60 }
61
62 #elif defined(SCTP_USE_OPENSSL_SHA1)
63
64 void
sctp_sha1_init(struct sctp_sha1_context * ctx)65 sctp_sha1_init(struct sctp_sha1_context *ctx)
66 {
67 SHA1_Init(&ctx->sha_ctx);
68 }
69
70 void
sctp_sha1_update(struct sctp_sha1_context * ctx,const unsigned char * ptr,unsigned int siz)71 sctp_sha1_update(struct sctp_sha1_context *ctx, const unsigned char *ptr, unsigned int siz)
72 {
73 SHA1_Update(&ctx->sha_ctx, ptr, (unsigned long)siz);
74 }
75
76 void
sctp_sha1_final(unsigned char * digest,struct sctp_sha1_context * ctx)77 sctp_sha1_final(unsigned char *digest, struct sctp_sha1_context *ctx)
78 {
79 SHA1_Final(digest, &ctx->sha_ctx);
80 }
81
82 #else
83
84 #include <string.h>
85 #if defined(__Userspace_os_Windows)
86 #include <winsock2.h>
87 #elif !defined(__Windows__)
88 #include <arpa/inet.h>
89 #endif
90
91 #define F1(B,C,D) (((B & C) | ((~B) & D))) /* 0 <= t <= 19 */
92 #define F2(B,C,D) (B ^ C ^ D) /* 20 <= t <= 39 */
93 #define F3(B,C,D) ((B & C) | (B & D) | (C & D)) /* 40 <= t <= 59 */
94 #define F4(B,C,D) (B ^ C ^ D) /* 600 <= t <= 79 */
95
96 /* circular shift */
97 #define CSHIFT(A,B) ((B << A) | (B >> (32-A)))
98
99 #define K1 0x5a827999 /* 0 <= t <= 19 */
100 #define K2 0x6ed9eba1 /* 20 <= t <= 39 */
101 #define K3 0x8f1bbcdc /* 40 <= t <= 59 */
102 #define K4 0xca62c1d6 /* 60 <= t <= 79 */
103
104 #define H0INIT 0x67452301
105 #define H1INIT 0xefcdab89
106 #define H2INIT 0x98badcfe
107 #define H3INIT 0x10325476
108 #define H4INIT 0xc3d2e1f0
109
110 void
sctp_sha1_init(struct sctp_sha1_context * ctx)111 sctp_sha1_init(struct sctp_sha1_context *ctx)
112 {
113 /* Init the SHA-1 context structure */
114 ctx->A = 0;
115 ctx->B = 0;
116 ctx->C = 0;
117 ctx->D = 0;
118 ctx->E = 0;
119 ctx->H0 = H0INIT;
120 ctx->H1 = H1INIT;
121 ctx->H2 = H2INIT;
122 ctx->H3 = H3INIT;
123 ctx->H4 = H4INIT;
124 ctx->TEMP = 0;
125 memset(ctx->words, 0, sizeof(ctx->words));
126 ctx->how_many_in_block = 0;
127 ctx->running_total = 0;
128 }
129
130 static void
sctp_sha1_process_a_block(struct sctp_sha1_context * ctx,unsigned int * block)131 sctp_sha1_process_a_block(struct sctp_sha1_context *ctx, unsigned int *block)
132 {
133 int i;
134
135 /* init the W0-W15 to the block of words being hashed. */
136 /* step a) */
137 for (i = 0; i < 16; i++) {
138 ctx->words[i] = ntohl(block[i]);
139 }
140 /* now init the rest based on the SHA-1 formula, step b) */
141 for (i = 16; i < 80; i++) {
142 ctx->words[i] = CSHIFT(1, ((ctx->words[(i - 3)]) ^
143 (ctx->words[(i - 8)]) ^
144 (ctx->words[(i - 14)]) ^
145 (ctx->words[(i - 16)])));
146 }
147 /* step c) */
148 ctx->A = ctx->H0;
149 ctx->B = ctx->H1;
150 ctx->C = ctx->H2;
151 ctx->D = ctx->H3;
152 ctx->E = ctx->H4;
153
154 /* step d) */
155 for (i = 0; i < 80; i++) {
156 if (i < 20) {
157 ctx->TEMP = ((CSHIFT(5, ctx->A)) +
158 (F1(ctx->B, ctx->C, ctx->D)) +
159 (ctx->E) +
160 ctx->words[i] +
161 K1);
162 } else if (i < 40) {
163 ctx->TEMP = ((CSHIFT(5, ctx->A)) +
164 (F2(ctx->B, ctx->C, ctx->D)) +
165 (ctx->E) +
166 (ctx->words[i]) +
167 K2);
168 } else if (i < 60) {
169 ctx->TEMP = ((CSHIFT(5, ctx->A)) +
170 (F3(ctx->B, ctx->C, ctx->D)) +
171 (ctx->E) +
172 (ctx->words[i]) +
173 K3);
174 } else {
175 ctx->TEMP = ((CSHIFT(5, ctx->A)) +
176 (F4(ctx->B, ctx->C, ctx->D)) +
177 (ctx->E) +
178 (ctx->words[i]) +
179 K4);
180 }
181 ctx->E = ctx->D;
182 ctx->D = ctx->C;
183 ctx->C = CSHIFT(30, ctx->B);
184 ctx->B = ctx->A;
185 ctx->A = ctx->TEMP;
186 }
187 /* step e) */
188 ctx->H0 = (ctx->H0) + (ctx->A);
189 ctx->H1 = (ctx->H1) + (ctx->B);
190 ctx->H2 = (ctx->H2) + (ctx->C);
191 ctx->H3 = (ctx->H3) + (ctx->D);
192 ctx->H4 = (ctx->H4) + (ctx->E);
193 }
194
195 void
sctp_sha1_update(struct sctp_sha1_context * ctx,const unsigned char * ptr,unsigned int siz)196 sctp_sha1_update(struct sctp_sha1_context *ctx, const unsigned char *ptr, unsigned int siz)
197 {
198 unsigned int number_left, left_to_fill;
199
200 number_left = siz;
201 while (number_left > 0) {
202 left_to_fill = sizeof(ctx->sha_block) - ctx->how_many_in_block;
203 if (left_to_fill > number_left) {
204 /* can only partially fill up this one */
205 memcpy(&ctx->sha_block[ctx->how_many_in_block],
206 ptr, number_left);
207 ctx->how_many_in_block += number_left;
208 ctx->running_total += number_left;
209 break;
210 } else {
211 /* block is now full, process it */
212 memcpy(&ctx->sha_block[ctx->how_many_in_block],
213 ptr, left_to_fill);
214 sctp_sha1_process_a_block(ctx,
215 (unsigned int *)ctx->sha_block);
216 number_left -= left_to_fill;
217 ctx->running_total += left_to_fill;
218 ctx->how_many_in_block = 0;
219 ptr = (const unsigned char *)(ptr + left_to_fill);
220 }
221 }
222 }
223
224 void
sctp_sha1_final(unsigned char * digest,struct sctp_sha1_context * ctx)225 sctp_sha1_final(unsigned char *digest, struct sctp_sha1_context *ctx)
226 {
227 /*
228 * if any left in block fill with padding and process. Then transfer
229 * the digest to the pointer. At the last block some special rules
230 * need to apply. We must add a 1 bit following the message, then we
231 * pad with 0's. The total size is encoded as a 64 bit number at the
232 * end. Now if the last buffer has more than 55 octets in it we
233 * cannot fit the 64 bit number + 10000000 pad on the end and must
234 * add the 10000000 pad, pad the rest of the message with 0's and
235 * then create an all 0 message with just the 64 bit size at the end
236 * and run this block through by itself. Also the 64 bit int must
237 * be in network byte order.
238 */
239 int left_to_fill;
240 unsigned int i, *ptr;
241
242 if (ctx->how_many_in_block > 55) {
243 /*
244 * special case, we need to process two blocks here. One for
245 * the current stuff plus possibly the pad. The other for
246 * the size.
247 */
248 left_to_fill = sizeof(ctx->sha_block) - ctx->how_many_in_block;
249 if (left_to_fill == 0) {
250 /* Should not really happen but I am paranoid */
251 sctp_sha1_process_a_block(ctx,
252 (unsigned int *)ctx->sha_block);
253 /* init last block, a bit different than the rest */
254 ctx->sha_block[0] = '\x80';
255 for (i = 1; i < sizeof(ctx->sha_block); i++) {
256 ctx->sha_block[i] = 0x0;
257 }
258 } else if (left_to_fill == 1) {
259 ctx->sha_block[ctx->how_many_in_block] = '\x80';
260 sctp_sha1_process_a_block(ctx,
261 (unsigned int *)ctx->sha_block);
262 /* init last block */
263 memset(ctx->sha_block, 0, sizeof(ctx->sha_block));
264 } else {
265 ctx->sha_block[ctx->how_many_in_block] = '\x80';
266 for (i = (ctx->how_many_in_block + 1);
267 i < sizeof(ctx->sha_block);
268 i++) {
269 ctx->sha_block[i] = 0x0;
270 }
271 sctp_sha1_process_a_block(ctx,
272 (unsigned int *)ctx->sha_block);
273 /* init last block */
274 memset(ctx->sha_block, 0, sizeof(ctx->sha_block));
275 }
276 /* This is in bits so multiply by 8 */
277 ctx->running_total *= 8;
278 ptr = (unsigned int *)&ctx->sha_block[60];
279 *ptr = htonl(ctx->running_total);
280 sctp_sha1_process_a_block(ctx, (unsigned int *)ctx->sha_block);
281 } else {
282 /*
283 * easy case, we just pad this message to size - end with 0
284 * add the magic 0x80 to the next word and then put the
285 * network byte order size in the last spot and process the
286 * block.
287 */
288 ctx->sha_block[ctx->how_many_in_block] = '\x80';
289 for (i = (ctx->how_many_in_block + 1);
290 i < sizeof(ctx->sha_block);
291 i++) {
292 ctx->sha_block[i] = 0x0;
293 }
294 /* get last int spot */
295 ctx->running_total *= 8;
296 ptr = (unsigned int *)&ctx->sha_block[60];
297 *ptr = htonl(ctx->running_total);
298 sctp_sha1_process_a_block(ctx, (unsigned int *)ctx->sha_block);
299 }
300 /* transfer the digest back to the user */
301 digest[3] = (ctx->H0 & 0xff);
302 digest[2] = ((ctx->H0 >> 8) & 0xff);
303 digest[1] = ((ctx->H0 >> 16) & 0xff);
304 digest[0] = ((ctx->H0 >> 24) & 0xff);
305
306 digest[7] = (ctx->H1 & 0xff);
307 digest[6] = ((ctx->H1 >> 8) & 0xff);
308 digest[5] = ((ctx->H1 >> 16) & 0xff);
309 digest[4] = ((ctx->H1 >> 24) & 0xff);
310
311 digest[11] = (ctx->H2 & 0xff);
312 digest[10] = ((ctx->H2 >> 8) & 0xff);
313 digest[9] = ((ctx->H2 >> 16) & 0xff);
314 digest[8] = ((ctx->H2 >> 24) & 0xff);
315
316 digest[15] = (ctx->H3 & 0xff);
317 digest[14] = ((ctx->H3 >> 8) & 0xff);
318 digest[13] = ((ctx->H3 >> 16) & 0xff);
319 digest[12] = ((ctx->H3 >> 24) & 0xff);
320
321 digest[19] = (ctx->H4 & 0xff);
322 digest[18] = ((ctx->H4 >> 8) & 0xff);
323 digest[17] = ((ctx->H4 >> 16) & 0xff);
324 digest[16] = ((ctx->H4 >> 24) & 0xff);
325 }
326
327 #endif
328