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
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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"
61 /* First you setup M and L parameters and pass the key schedule.
62 * This is called once per session setup... */
63 void CRYPTO_ccm128_init(CCM128_CONTEXT *ctx,
64 unsigned int M,unsigned int L,void *key,block128_f block)
66 memset(ctx->nonce.c,0,sizeof(ctx->nonce.c));
67 ctx->nonce.c[0] = ((u8)(L-1)&7) | (u8)(((M-2)/2)&7)<<3;
73 /* !!! Following interfaces are to be called *once* per packet !!! */
75 /* Then you setup per-message nonce and pass the length of the message */
76 int CRYPTO_ccm128_setiv(CCM128_CONTEXT *ctx,
77 const unsigned char *nonce,size_t nlen,size_t mlen)
79 unsigned int L = ctx->nonce.c[0]&7; /* the L parameter */
81 if (nlen<(14-L)) return -1; /* nonce is too short */
83 if (sizeof(mlen)==8 && L>=3) {
84 ctx->nonce.c[8] = (u8)(mlen>>(56%(sizeof(mlen)*8)));
85 ctx->nonce.c[9] = (u8)(mlen>>(48%(sizeof(mlen)*8)));
86 ctx->nonce.c[10] = (u8)(mlen>>(40%(sizeof(mlen)*8)));
87 ctx->nonce.c[11] = (u8)(mlen>>(32%(sizeof(mlen)*8)));
92 ctx->nonce.c[12] = (u8)(mlen>>24);
93 ctx->nonce.c[13] = (u8)(mlen>>16);
94 ctx->nonce.c[14] = (u8)(mlen>>8);
95 ctx->nonce.c[15] = (u8)mlen;
97 ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
98 memcpy(&ctx->nonce.c[1],nonce,14-L);
103 /* Then you pass additional authentication data, this is optional */
104 void CRYPTO_ccm128_aad(CCM128_CONTEXT *ctx,
105 const unsigned char *aad,size_t alen)
107 block128_f block = ctx->block;
111 ctx->nonce.c[0] |= 0x40; /* set Adata flag */
112 (*block)(ctx->nonce.c,ctx->cmac.c,ctx->key),
115 if (alen<(0x10000-0x100)) {
116 ctx->cmac.c[0] ^= (u8)(alen>>8);
117 ctx->cmac.c[1] ^= (u8)alen;
120 else if (sizeof(alen)==8 && alen>=(size_t)1<<(32%(sizeof(alen)*8))) {
121 ctx->cmac.c[0] ^= 0xFF;
122 ctx->cmac.c[1] ^= 0xFF;
123 ctx->cmac.c[2] ^= (u8)(alen>>(56%(sizeof(alen)*8)));
124 ctx->cmac.c[3] ^= (u8)(alen>>(48%(sizeof(alen)*8)));
125 ctx->cmac.c[4] ^= (u8)(alen>>(40%(sizeof(alen)*8)));
126 ctx->cmac.c[5] ^= (u8)(alen>>(32%(sizeof(alen)*8)));
127 ctx->cmac.c[6] ^= (u8)(alen>>24);
128 ctx->cmac.c[7] ^= (u8)(alen>>16);
129 ctx->cmac.c[8] ^= (u8)(alen>>8);
130 ctx->cmac.c[9] ^= (u8)alen;
134 ctx->cmac.c[0] ^= 0xFF;
135 ctx->cmac.c[1] ^= 0xFE;
136 ctx->cmac.c[2] ^= (u8)(alen>>24);
137 ctx->cmac.c[3] ^= (u8)(alen>>16);
138 ctx->cmac.c[4] ^= (u8)(alen>>8);
139 ctx->cmac.c[5] ^= (u8)alen;
144 for(;i<16 && alen;++i,++aad,--alen)
145 ctx->cmac.c[i] ^= *aad;
146 (*block)(ctx->cmac.c,ctx->cmac.c,ctx->key),
152 /* Finally you encrypt or decrypt the message */
154 /* counter part of nonce may not be larger than L*8 bits,
155 * L is not larger than 8, therefore 64-bit counter... */
156 static void ctr64_inc(unsigned char *counter) {
170 int CRYPTO_ccm128_encrypt(CCM128_CONTEXT *ctx,
171 const unsigned char *inp, unsigned char *out,
176 unsigned char flags0 = ctx->nonce.c[0];
177 block128_f block = ctx->block;
178 void * key = ctx->key;
179 union { u64 u[2]; u8 c[16]; } scratch;
182 (*block)(ctx->nonce.c,ctx->cmac.c,key),
185 ctx->nonce.c[0] = L = flags0&7;
186 for (n=0,i=15-L;i<15;++i) {
187 n |= ctx->nonce.c[i];
191 n |= ctx->nonce.c[15]; /* reconstructed length */
194 if (n!=len) return -1; /* length mismatch */
196 ctx->blocks += ((len+15)>>3)|1;
197 if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
200 #if defined(STRICT_ALIGNMENT)
201 union { u64 u[2]; u8 c[16]; } temp;
203 memcpy (temp.c,inp,16);
204 ctx->cmac.u[0] ^= temp.u[0];
205 ctx->cmac.u[1] ^= temp.u[1];
207 ctx->cmac.u[0] ^= ((u64*)inp)[0];
208 ctx->cmac.u[1] ^= ((u64*)inp)[1];
210 (*block)(ctx->cmac.c,ctx->cmac.c,key);
211 (*block)(ctx->nonce.c,scratch.c,key);
212 ctr64_inc(ctx->nonce.c);
213 #if defined(STRICT_ALIGNMENT)
214 temp.u[0] ^= scratch.u[0];
215 temp.u[1] ^= scratch.u[1];
216 memcpy(out,temp.c,16);
218 ((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0];
219 ((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1];
227 for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
228 (*block)(ctx->cmac.c,ctx->cmac.c,key);
229 (*block)(ctx->nonce.c,scratch.c,key);
230 for (i=0; i<len; ++i) out[i] = scratch.c[i]^inp[i];
233 for (i=15-L;i<16;++i)
236 (*block)(ctx->nonce.c,scratch.c,key);
237 ctx->cmac.u[0] ^= scratch.u[0];
238 ctx->cmac.u[1] ^= scratch.u[1];
240 ctx->nonce.c[0] = flags0;
245 int CRYPTO_ccm128_decrypt(CCM128_CONTEXT *ctx,
246 const unsigned char *inp, unsigned char *out,
251 unsigned char flags0 = ctx->nonce.c[0];
252 block128_f block = ctx->block;
253 void * key = ctx->key;
254 union { u64 u[2]; u8 c[16]; } scratch;
257 (*block)(ctx->nonce.c,ctx->cmac.c,key);
259 ctx->nonce.c[0] = L = flags0&7;
260 for (n=0,i=15-L;i<15;++i) {
261 n |= ctx->nonce.c[i];
265 n |= ctx->nonce.c[15]; /* reconstructed length */
268 if (n!=len) return -1;
271 #if defined(STRICT_ALIGNMENT)
272 union { u64 u[2]; u8 c[16]; } temp;
274 (*block)(ctx->nonce.c,scratch.c,key);
275 ctr64_inc(ctx->nonce.c);
276 #if defined(STRICT_ALIGNMENT)
277 memcpy (temp.c,inp,16);
278 ctx->cmac.u[0] ^= (scratch.u[0] ^= temp.u[0]);
279 ctx->cmac.u[1] ^= (scratch.u[1] ^= temp.u[1]);
280 memcpy (out,scratch.c,16);
282 ctx->cmac.u[0] ^= (((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0]);
283 ctx->cmac.u[1] ^= (((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1]);
285 (*block)(ctx->cmac.c,ctx->cmac.c,key);
293 (*block)(ctx->nonce.c,scratch.c,key);
294 for (i=0; i<len; ++i)
295 ctx->cmac.c[i] ^= (out[i] = scratch.c[i]^inp[i]);
296 (*block)(ctx->cmac.c,ctx->cmac.c,key);
299 for (i=15-L;i<16;++i)
302 (*block)(ctx->nonce.c,scratch.c,key);
303 ctx->cmac.u[0] ^= scratch.u[0];
304 ctx->cmac.u[1] ^= scratch.u[1];
306 ctx->nonce.c[0] = flags0;
311 static void ctr64_add (unsigned char *counter,size_t inc)
317 val += counter[n] + (inc&0xff);
318 counter[n] = (unsigned char)val;
319 val >>= 8; /* carry bit */
321 } while(n && (inc || val));
324 int CRYPTO_ccm128_encrypt_ccm64(CCM128_CONTEXT *ctx,
325 const unsigned char *inp, unsigned char *out,
326 size_t len,ccm128_f stream)
330 unsigned char flags0 = ctx->nonce.c[0];
331 block128_f block = ctx->block;
332 void * key = ctx->key;
333 union { u64 u[2]; u8 c[16]; } scratch;
336 (*block)(ctx->nonce.c,ctx->cmac.c,key),
339 ctx->nonce.c[0] = L = flags0&7;
340 for (n=0,i=15-L;i<15;++i) {
341 n |= ctx->nonce.c[i];
345 n |= ctx->nonce.c[15]; /* reconstructed length */
348 if (n!=len) return -1; /* length mismatch */
350 ctx->blocks += ((len+15)>>3)|1;
351 if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
354 (*stream)(inp,out,n,key,ctx->nonce.c,ctx->cmac.c);
359 if (len) ctr64_add(ctx->nonce.c,n/16);
363 for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
364 (*block)(ctx->cmac.c,ctx->cmac.c,key);
365 (*block)(ctx->nonce.c,scratch.c,key);
366 for (i=0; i<len; ++i) out[i] = scratch.c[i]^inp[i];
369 for (i=15-L;i<16;++i)
372 (*block)(ctx->nonce.c,scratch.c,key);
373 ctx->cmac.u[0] ^= scratch.u[0];
374 ctx->cmac.u[1] ^= scratch.u[1];
376 ctx->nonce.c[0] = flags0;
381 int CRYPTO_ccm128_decrypt_ccm64(CCM128_CONTEXT *ctx,
382 const unsigned char *inp, unsigned char *out,
383 size_t len,ccm128_f stream)
387 unsigned char flags0 = ctx->nonce.c[0];
388 block128_f block = ctx->block;
389 void * key = ctx->key;
390 union { u64 u[2]; u8 c[16]; } scratch;
393 (*block)(ctx->nonce.c,ctx->cmac.c,key);
395 ctx->nonce.c[0] = L = flags0&7;
396 for (n=0,i=15-L;i<15;++i) {
397 n |= ctx->nonce.c[i];
401 n |= ctx->nonce.c[15]; /* reconstructed length */
404 if (n!=len) return -1;
407 (*stream)(inp,out,n,key,ctx->nonce.c,ctx->cmac.c);
412 if (len) ctr64_add(ctx->nonce.c,n/16);
416 (*block)(ctx->nonce.c,scratch.c,key);
417 for (i=0; i<len; ++i)
418 ctx->cmac.c[i] ^= (out[i] = scratch.c[i]^inp[i]);
419 (*block)(ctx->cmac.c,ctx->cmac.c,key);
422 for (i=15-L;i<16;++i)
425 (*block)(ctx->nonce.c,scratch.c,key);
426 ctx->cmac.u[0] ^= scratch.u[0];
427 ctx->cmac.u[1] ^= scratch.u[1];
429 ctx->nonce.c[0] = flags0;
434 size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx,unsigned char *tag,size_t len)
435 { unsigned int M = (ctx->nonce.c[0]>>3)&7; /* the M parameter */
439 memcpy(tag,ctx->cmac.c,M);