1 /* ====================================================================
2 * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * openssl-core@openssl.org.
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
50 #include <openssl/crypto.h>
51 #include "modes_lcl.h"
55 * First you setup M and L parameters and pass the key schedule. This is
56 * called once per session setup...
58 void CRYPTO_ccm128_init(CCM128_CONTEXT *ctx,
59 unsigned int M, unsigned int L, void *key,
62 memset(ctx->nonce.c, 0, sizeof(ctx->nonce.c));
63 ctx->nonce.c[0] = ((u8)(L - 1) & 7) | (u8)(((M - 2) / 2) & 7) << 3;
69 /* !!! Following interfaces are to be called *once* per packet !!! */
71 /* Then you setup per-message nonce and pass the length of the message */
72 int CRYPTO_ccm128_setiv(CCM128_CONTEXT *ctx,
73 const unsigned char *nonce, size_t nlen, size_t mlen)
75 unsigned int L = ctx->nonce.c[0] & 7; /* the L parameter */
78 return -1; /* nonce is too short */
80 if (sizeof(mlen) == 8 && L >= 3) {
81 ctx->nonce.c[8] = (u8)(mlen >> (56 % (sizeof(mlen) * 8)));
82 ctx->nonce.c[9] = (u8)(mlen >> (48 % (sizeof(mlen) * 8)));
83 ctx->nonce.c[10] = (u8)(mlen >> (40 % (sizeof(mlen) * 8)));
84 ctx->nonce.c[11] = (u8)(mlen >> (32 % (sizeof(mlen) * 8)));
88 ctx->nonce.c[12] = (u8)(mlen >> 24);
89 ctx->nonce.c[13] = (u8)(mlen >> 16);
90 ctx->nonce.c[14] = (u8)(mlen >> 8);
91 ctx->nonce.c[15] = (u8)mlen;
93 ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
94 memcpy(&ctx->nonce.c[1], nonce, 14 - L);
99 /* Then you pass additional authentication data, this is optional */
100 void CRYPTO_ccm128_aad(CCM128_CONTEXT *ctx,
101 const unsigned char *aad, size_t alen)
104 block128_f block = ctx->block;
109 ctx->nonce.c[0] |= 0x40; /* set Adata flag */
110 (*block) (ctx->nonce.c, ctx->cmac.c, ctx->key), ctx->blocks++;
112 if (alen < (0x10000 - 0x100)) {
113 ctx->cmac.c[0] ^= (u8)(alen >> 8);
114 ctx->cmac.c[1] ^= (u8)alen;
116 } else if (sizeof(alen) == 8
117 && alen >= (size_t)1 << (32 % (sizeof(alen) * 8))) {
118 ctx->cmac.c[0] ^= 0xFF;
119 ctx->cmac.c[1] ^= 0xFF;
120 ctx->cmac.c[2] ^= (u8)(alen >> (56 % (sizeof(alen) * 8)));
121 ctx->cmac.c[3] ^= (u8)(alen >> (48 % (sizeof(alen) * 8)));
122 ctx->cmac.c[4] ^= (u8)(alen >> (40 % (sizeof(alen) * 8)));
123 ctx->cmac.c[5] ^= (u8)(alen >> (32 % (sizeof(alen) * 8)));
124 ctx->cmac.c[6] ^= (u8)(alen >> 24);
125 ctx->cmac.c[7] ^= (u8)(alen >> 16);
126 ctx->cmac.c[8] ^= (u8)(alen >> 8);
127 ctx->cmac.c[9] ^= (u8)alen;
130 ctx->cmac.c[0] ^= 0xFF;
131 ctx->cmac.c[1] ^= 0xFE;
132 ctx->cmac.c[2] ^= (u8)(alen >> 24);
133 ctx->cmac.c[3] ^= (u8)(alen >> 16);
134 ctx->cmac.c[4] ^= (u8)(alen >> 8);
135 ctx->cmac.c[5] ^= (u8)alen;
140 for (; i < 16 && alen; ++i, ++aad, --alen)
141 ctx->cmac.c[i] ^= *aad;
142 (*block) (ctx->cmac.c, ctx->cmac.c, ctx->key), ctx->blocks++;
147 /* Finally you encrypt or decrypt the message */
150 * counter part of nonce may not be larger than L*8 bits, L is not larger
151 * than 8, therefore 64-bit counter...
153 static void ctr64_inc(unsigned char *counter)
169 int CRYPTO_ccm128_encrypt(CCM128_CONTEXT *ctx,
170 const unsigned char *inp, unsigned char *out,
175 unsigned char flags0 = ctx->nonce.c[0];
176 block128_f block = ctx->block;
177 void *key = ctx->key;
183 if (!(flags0 & 0x40))
184 (*block) (ctx->nonce.c, ctx->cmac.c, key), ctx->blocks++;
186 ctx->nonce.c[0] = L = flags0 & 7;
187 for (n = 0, i = 15 - L; i < 15; ++i) {
188 n |= ctx->nonce.c[i];
192 n |= ctx->nonce.c[15]; /* reconstructed length */
193 ctx->nonce.c[15] = 1;
196 return -1; /* length mismatch */
198 ctx->blocks += ((len + 15) >> 3) | 1;
199 if (ctx->blocks > (U64(1) << 61))
200 return -2; /* too much data */
203 #if defined(STRICT_ALIGNMENT)
209 memcpy(temp.c, inp, 16);
210 ctx->cmac.u[0] ^= temp.u[0];
211 ctx->cmac.u[1] ^= temp.u[1];
213 ctx->cmac.u[0] ^= ((u64 *)inp)[0];
214 ctx->cmac.u[1] ^= ((u64 *)inp)[1];
216 (*block) (ctx->cmac.c, ctx->cmac.c, key);
217 (*block) (ctx->nonce.c, scratch.c, key);
218 ctr64_inc(ctx->nonce.c);
219 #if defined(STRICT_ALIGNMENT)
220 temp.u[0] ^= scratch.u[0];
221 temp.u[1] ^= scratch.u[1];
222 memcpy(out, temp.c, 16);
224 ((u64 *)out)[0] = scratch.u[0] ^ ((u64 *)inp)[0];
225 ((u64 *)out)[1] = scratch.u[1] ^ ((u64 *)inp)[1];
233 for (i = 0; i < len; ++i)
234 ctx->cmac.c[i] ^= inp[i];
235 (*block) (ctx->cmac.c, ctx->cmac.c, key);
236 (*block) (ctx->nonce.c, scratch.c, key);
237 for (i = 0; i < len; ++i)
238 out[i] = scratch.c[i] ^ inp[i];
241 for (i = 15 - L; i < 16; ++i)
244 (*block) (ctx->nonce.c, scratch.c, key);
245 ctx->cmac.u[0] ^= scratch.u[0];
246 ctx->cmac.u[1] ^= scratch.u[1];
248 ctx->nonce.c[0] = flags0;
253 int CRYPTO_ccm128_decrypt(CCM128_CONTEXT *ctx,
254 const unsigned char *inp, unsigned char *out,
259 unsigned char flags0 = ctx->nonce.c[0];
260 block128_f block = ctx->block;
261 void *key = ctx->key;
267 if (!(flags0 & 0x40))
268 (*block) (ctx->nonce.c, ctx->cmac.c, key);
270 ctx->nonce.c[0] = L = flags0 & 7;
271 for (n = 0, i = 15 - L; i < 15; ++i) {
272 n |= ctx->nonce.c[i];
276 n |= ctx->nonce.c[15]; /* reconstructed length */
277 ctx->nonce.c[15] = 1;
283 #if defined(STRICT_ALIGNMENT)
289 (*block) (ctx->nonce.c, scratch.c, key);
290 ctr64_inc(ctx->nonce.c);
291 #if defined(STRICT_ALIGNMENT)
292 memcpy(temp.c, inp, 16);
293 ctx->cmac.u[0] ^= (scratch.u[0] ^= temp.u[0]);
294 ctx->cmac.u[1] ^= (scratch.u[1] ^= temp.u[1]);
295 memcpy(out, scratch.c, 16);
297 ctx->cmac.u[0] ^= (((u64 *)out)[0] = scratch.u[0] ^ ((u64 *)inp)[0]);
298 ctx->cmac.u[1] ^= (((u64 *)out)[1] = scratch.u[1] ^ ((u64 *)inp)[1]);
300 (*block) (ctx->cmac.c, ctx->cmac.c, key);
308 (*block) (ctx->nonce.c, scratch.c, key);
309 for (i = 0; i < len; ++i)
310 ctx->cmac.c[i] ^= (out[i] = scratch.c[i] ^ inp[i]);
311 (*block) (ctx->cmac.c, ctx->cmac.c, key);
314 for (i = 15 - L; i < 16; ++i)
317 (*block) (ctx->nonce.c, scratch.c, key);
318 ctx->cmac.u[0] ^= scratch.u[0];
319 ctx->cmac.u[1] ^= scratch.u[1];
321 ctx->nonce.c[0] = flags0;
326 static void ctr64_add(unsigned char *counter, size_t inc)
328 size_t n = 8, val = 0;
333 val += counter[n] + (inc & 0xff);
334 counter[n] = (unsigned char)val;
335 val >>= 8; /* carry bit */
337 } while (n && (inc || val));
340 int CRYPTO_ccm128_encrypt_ccm64(CCM128_CONTEXT *ctx,
341 const unsigned char *inp, unsigned char *out,
342 size_t len, ccm128_f stream)
346 unsigned char flags0 = ctx->nonce.c[0];
347 block128_f block = ctx->block;
348 void *key = ctx->key;
354 if (!(flags0 & 0x40))
355 (*block) (ctx->nonce.c, ctx->cmac.c, key), ctx->blocks++;
357 ctx->nonce.c[0] = L = flags0 & 7;
358 for (n = 0, i = 15 - L; i < 15; ++i) {
359 n |= ctx->nonce.c[i];
363 n |= ctx->nonce.c[15]; /* reconstructed length */
364 ctx->nonce.c[15] = 1;
367 return -1; /* length mismatch */
369 ctx->blocks += ((len + 15) >> 3) | 1;
370 if (ctx->blocks > (U64(1) << 61))
371 return -2; /* too much data */
373 if ((n = len / 16)) {
374 (*stream) (inp, out, n, key, ctx->nonce.c, ctx->cmac.c);
380 ctr64_add(ctx->nonce.c, n / 16);
384 for (i = 0; i < len; ++i)
385 ctx->cmac.c[i] ^= inp[i];
386 (*block) (ctx->cmac.c, ctx->cmac.c, key);
387 (*block) (ctx->nonce.c, scratch.c, key);
388 for (i = 0; i < len; ++i)
389 out[i] = scratch.c[i] ^ inp[i];
392 for (i = 15 - L; i < 16; ++i)
395 (*block) (ctx->nonce.c, scratch.c, key);
396 ctx->cmac.u[0] ^= scratch.u[0];
397 ctx->cmac.u[1] ^= scratch.u[1];
399 ctx->nonce.c[0] = flags0;
404 int CRYPTO_ccm128_decrypt_ccm64(CCM128_CONTEXT *ctx,
405 const unsigned char *inp, unsigned char *out,
406 size_t len, ccm128_f stream)
410 unsigned char flags0 = ctx->nonce.c[0];
411 block128_f block = ctx->block;
412 void *key = ctx->key;
418 if (!(flags0 & 0x40))
419 (*block) (ctx->nonce.c, ctx->cmac.c, key);
421 ctx->nonce.c[0] = L = flags0 & 7;
422 for (n = 0, i = 15 - L; i < 15; ++i) {
423 n |= ctx->nonce.c[i];
427 n |= ctx->nonce.c[15]; /* reconstructed length */
428 ctx->nonce.c[15] = 1;
433 if ((n = len / 16)) {
434 (*stream) (inp, out, n, key, ctx->nonce.c, ctx->cmac.c);
440 ctr64_add(ctx->nonce.c, n / 16);
444 (*block) (ctx->nonce.c, scratch.c, key);
445 for (i = 0; i < len; ++i)
446 ctx->cmac.c[i] ^= (out[i] = scratch.c[i] ^ inp[i]);
447 (*block) (ctx->cmac.c, ctx->cmac.c, key);
450 for (i = 15 - L; i < 16; ++i)
453 (*block) (ctx->nonce.c, scratch.c, key);
454 ctx->cmac.u[0] ^= scratch.u[0];
455 ctx->cmac.u[1] ^= scratch.u[1];
457 ctx->nonce.c[0] = flags0;
462 size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx, unsigned char *tag, size_t len)
464 unsigned int M = (ctx->nonce.c[0] >> 3) & 7; /* the M parameter */
470 memcpy(tag, ctx->cmac.c, M);