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)
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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"
62 union { u8 c[16]; size_t s[16/sizeof(size_t)]; } nonce, cmac,
69 /* First you setup M and L parameters and pass the key schedule */
70 void CRYPTO_ccm128_init(CCM128_CONTEXT *ctx,
71 unsigned int M,unsigned int L,void *key,block128_f block)
73 memset(ctx->nonce.c,0,sizeof(ctx->nonce.c));
74 ctx->nonce.c[0] = ((u8)(L-1)&7) | (u8)(((M-2)/2)&7)<<3;
80 /* !!! Following interfaces are to be called *once* per packet !!! */
82 /* Then you setup per-message nonce and pass the length of the message */
83 int CRYPTO_ccm128_setiv(CCM128_CONTEXT *ctx,
84 const unsigned char *nonce,size_t nlen,size_t mlen)
86 unsigned int L = ctx->nonce.c[0]&7; /* the L parameter */
88 if (nlen<(14-L)) return -1; /* nonce is too short */
90 if (sizeof(mlen)==8 && L>=3) {
91 ctx->nonce.c[8] = (u8)(mlen>>(56%(sizeof(mlen)*8)));
92 ctx->nonce.c[9] = (u8)(mlen>>(48%(sizeof(mlen)*8)));
93 ctx->nonce.c[10] = (u8)(mlen>>(40%(sizeof(mlen)*8)));
94 ctx->nonce.c[11] = (u8)(mlen>>(32%(sizeof(mlen)*8)));
97 *((size_t *)&ctx->nonce.s[8]) = 0;
99 ctx->nonce.c[12] = (u8)(mlen>>24);
100 ctx->nonce.c[13] = (u8)(mlen>>16);
101 ctx->nonce.c[14] = (u8)(mlen>>8);
102 ctx->nonce.c[15] = (u8)mlen;
104 ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
105 memcpy(&ctx->nonce.c[1],nonce,14-L);
110 /* Then you pass additional authentication data, this is optional */
111 void CRYPTO_ccm128_aad(CCM128_CONTEXT *ctx,
112 const unsigned char *aad,size_t alen)
117 ctx->nonce.c[0] |= 0x40; /* set Adata flag */
118 (*ctx->block)(ctx->nonce.c,ctx->cmac.c,ctx->key),
121 if (alen<(0x10000-0x100)) {
122 ctx->cmac.c[0] ^= (u8)(alen>>8);
123 ctx->cmac.c[1] ^= (u8)alen;
126 else if (sizeof(alen)==8 && alen>=(size_t)1<<32) {
127 ctx->cmac.c[0] ^= 0xFF;
128 ctx->cmac.c[1] ^= 0xFF;
129 ctx->cmac.c[2] ^= (u8)(alen>>(56%(sizeof(alen)*8)));
130 ctx->cmac.c[3] ^= (u8)(alen>>(48%(sizeof(alen)*8)));
131 ctx->cmac.c[4] ^= (u8)(alen>>(40%(sizeof(alen)*8)));
132 ctx->cmac.c[5] ^= (u8)(alen>>(32%(sizeof(alen)*8)));
133 ctx->cmac.c[6] ^= (u8)(alen>>24);
134 ctx->cmac.c[7] ^= (u8)(alen>>16);
135 ctx->cmac.c[8] ^= (u8)(alen>>8);
136 ctx->cmac.c[9] ^= (u8)alen;
140 ctx->cmac.c[0] ^= 0xFF;
141 ctx->cmac.c[1] ^= 0xFE;
142 ctx->cmac.c[2] ^= (u8)(alen>>24);
143 ctx->cmac.c[3] ^= (u8)(alen>>16);
144 ctx->cmac.c[4] ^= (u8)(alen>>8);
145 ctx->cmac.c[5] ^= (u8)alen;
150 for(;i<16 && alen;++i,++aad,--alen)
151 ctx->cmac.c[i] ^= *aad;
152 (*ctx->block)(ctx->cmac.c,ctx->cmac.c,ctx->key),
158 /* Finally you encrypt or decrypt the message */
160 static void ctr128_inc(unsigned char *counter) {
173 int CRYPTO_ccm128_encrypt(CCM128_CONTEXT *ctx,
174 const unsigned char *inp, unsigned char *out,
179 unsigned char flags = ctx->nonce.c[0];
182 (*ctx->block)(ctx->nonce.c,ctx->cmac.c,ctx->key),
185 flags &= 7; /* extract the L parameter */
186 for (n=0,i=15-flags;i<15;++i) {
187 n |= ctx->nonce.c[i]; ctx->nonce.c[i]=0;
190 n |= ctx->nonce.c[15]; /* reconstructed length */
193 if (n!=len) return -1; /* length mismatch */
195 ctx->blocks += ((len+15)>>3)|1;
196 if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
199 #if defined(STRICT_ALIGNMENT)
200 memcpy (ctx->inp.c,inp,16);
201 for (i=0; i<16/sizeof(size_t); ++i)
202 ctx->cmac.s[i] ^= ctx->inp.s[i];
204 for (i=0; i<16/sizeof(size_t); ++i)
205 ctx->cmac.s[i] ^= ((size_t*)inp)[i];
207 (*ctx->block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
208 (*ctx->block)(ctx->nonce.c,ctx->scratch.c,ctx->key);
209 ctr128_inc(ctx->nonce.c);
210 #if defined(STRICT_ALIGNMENT)
211 for (i=0; i<16/sizeof(size_t); ++i)
212 ctx->inp.s[i] ^= ctx->scratch.s[i];
213 memcpy(out,ctx->inp.c,16);
215 for (i=0; i<16/sizeof(size_t); ++i)
216 ((size_t*)out)[i] = ctx->scratch.s[i]^((size_t*)inp)[i];
224 for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
225 (*ctx->block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
226 (*ctx->block)(ctx->nonce.c,ctx->scratch.c,ctx->key);
227 for (i=0; i<len; ++i) out[i] = ctx->scratch.c[i]^inp[i];
230 for (i=15-flags;i<16;++i)
233 (*ctx->block)(ctx->nonce.c,ctx->scratch.c,ctx->key);
234 for (i=0; i<16/sizeof(size_t); ++i)
235 ctx->cmac.s[i] ^= ctx->scratch.s[i];
240 int CRYPTO_ccm128_decrypt(CCM128_CONTEXT *ctx,
241 const unsigned char *inp, unsigned char *out,
246 unsigned char flags = ctx->nonce.c[0];
249 (*ctx->block)(ctx->nonce.c,ctx->cmac.c,ctx->key);
251 flags &= 7; /* extract the L parameter */
252 for (n=0,i=15-flags;i<15;++i) {
253 n |= ctx->nonce.c[i]; ctx->nonce.c[i]=0;
256 n |= ctx->nonce.c[15]; /* reconstructed length */
259 if (n!=len) return -1;
262 (*ctx->block)(ctx->nonce.c,ctx->scratch.c,ctx->key);
263 ctr128_inc(ctx->nonce.c);
264 #if defined(STRICT_ALIGNMENT)
265 memcpy (ctx->inp.c,inp,16);
266 for (i=0; i<16/sizeof(size_t); ++i)
267 ctx->cmac.s[i] ^= (ctx->scratch.s[i] ^= ctx->inp.s[i]);
268 memcpy (out,ctx->scratch,16);
270 for (i=0; i<16/sizeof(size_t); ++i)
271 ctx->cmac.s[i] ^= ((size_t*)out)[i] = ctx->scratch.s[i]^((size_t*)inp)[i];
273 (*ctx->block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
281 (*ctx->block)(ctx->nonce.c,ctx->scratch.c,ctx->key);
282 for (i=0; i<len; ++len)
283 ctx->cmac.c[i] ^= (out[i] = ctx->scratch.c[i]^inp[i]);
284 (*ctx->block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
287 for (i=15-flags;i<16;++i)
290 (*ctx->block)(ctx->nonce.c,ctx->scratch.c,ctx->key);
291 for (i=0; i<16/sizeof(size_t); ++i)
292 ctx->cmac.s[i] ^= ctx->scratch.s[i];
297 size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx,unsigned char *tag,size_t len)
298 { unsigned int M = (ctx->nonce.c[0]>>3)&7; /* the M parameter */
302 memcpy(tag,ctx->cmac.c,M);