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/)"
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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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47 * ====================================================================
50 #include <openssl/crypto.h>
51 #include "modes_lcl.h"
62 union { u64 u[2]; u8 c[16]; } nonce, cmac;
68 /* First you setup M and L parameters and pass the key schedule */
69 void CRYPTO_ccm128_init(CCM128_CONTEXT *ctx,
70 unsigned int M,unsigned int L,void *key,block128_f block)
72 memset(ctx->nonce.c,0,sizeof(ctx->nonce.c));
73 ctx->nonce.c[0] = ((u8)(L-1)&7) | (u8)(((M-2)/2)&7)<<3;
79 /* !!! Following interfaces are to be called *once* per packet !!! */
81 /* Then you setup per-message nonce and pass the length of the message */
82 int CRYPTO_ccm128_setiv(CCM128_CONTEXT *ctx,
83 const unsigned char *nonce,size_t nlen,size_t mlen)
85 unsigned int L = ctx->nonce.c[0]&7; /* the L parameter */
87 if (nlen<(14-L)) return -1; /* nonce is too short */
89 if (sizeof(mlen)==8 && L>=3) {
90 ctx->nonce.c[8] = (u8)(mlen>>(56%(sizeof(mlen)*8)));
91 ctx->nonce.c[9] = (u8)(mlen>>(48%(sizeof(mlen)*8)));
92 ctx->nonce.c[10] = (u8)(mlen>>(40%(sizeof(mlen)*8)));
93 ctx->nonce.c[11] = (u8)(mlen>>(32%(sizeof(mlen)*8)));
96 *(u32*)(&ctx->nonce.c[8]) = 0;
98 ctx->nonce.c[12] = (u8)(mlen>>24);
99 ctx->nonce.c[13] = (u8)(mlen>>16);
100 ctx->nonce.c[14] = (u8)(mlen>>8);
101 ctx->nonce.c[15] = (u8)mlen;
103 ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
104 memcpy(&ctx->nonce.c[1],nonce,14-L);
109 /* Then you pass additional authentication data, this is optional */
110 void CRYPTO_ccm128_aad(CCM128_CONTEXT *ctx,
111 const unsigned char *aad,size_t alen)
113 block128_f block = ctx->block;
117 ctx->nonce.c[0] |= 0x40; /* set Adata flag */
118 (*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 (*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 flags0 = ctx->nonce.c[0];
180 block128_f block = ctx->block;
181 union { u64 u[2]; u8 c[16]; } scratch;
184 (*block)(ctx->nonce.c,ctx->cmac.c,ctx->key),
187 ctx->nonce.c[0] = L = flags0&7;
188 for (n=0,i=15-L;i<15;++i) {
189 n |= ctx->nonce.c[i];
193 n |= ctx->nonce.c[15]; /* reconstructed length */
196 if (n!=len) return -1; /* length mismatch */
198 ctx->blocks += ((len+15)>>3)|1;
199 if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
202 #if defined(STRICT_ALIGNMENT)
203 union { u64 u[2]; u8 c[16]; } temp;
205 memcpy (temp.c,inp,16);
206 ctx->cmac.u[0] ^= temp.u[0];
207 ctx->cmac.u[1] ^= temp.u[1];
209 ctx->cmac.u[0] ^= ((u64*)inp)[0];
210 ctx->cmac.u[1] ^= ((u64*)inp)[1];
212 (*block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
213 (*block)(ctx->nonce.c,scratch.c,ctx->key);
214 ctr128_inc(ctx->nonce.c);
215 #if defined(STRICT_ALIGNMENT)
216 temp.u[0] ^= scratch.u[0];
217 temp.u[1] ^= scratch.u[1];
218 memcpy(out,temp.c,16);
220 ((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0];
221 ((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1];
229 for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
230 (*block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
231 (*block)(ctx->nonce.c,scratch.c,ctx->key);
232 for (i=0; i<len; ++i) out[i] = scratch.c[i]^inp[i];
235 for (i=15-L;i<16;++i)
238 (*block)(ctx->nonce.c,scratch.c,ctx->key);
239 ctx->cmac.u[0] ^= scratch.u[0];
240 ctx->cmac.u[1] ^= scratch.u[1];
242 ctx->nonce.c[0] = flags0;
247 int CRYPTO_ccm128_decrypt(CCM128_CONTEXT *ctx,
248 const unsigned char *inp, unsigned char *out,
253 unsigned char flags0 = ctx->nonce.c[0];
255 union { u64 u[2]; u8 c[16]; } scratch;
258 (*block)(ctx->nonce.c,ctx->cmac.c,ctx->key);
260 ctx->nonce.c[0] = L = flags0&7;
261 for (n=0,i=15-L;i<15;++i) {
262 n |= ctx->nonce.c[i];
266 n |= ctx->nonce.c[15]; /* reconstructed length */
269 if (n!=len) return -1;
272 (*block)(ctx->nonce.c,scratch.c,ctx->key);
273 ctr128_inc(ctx->nonce.c);
274 #if defined(STRICT_ALIGNMENT)
275 memcpy (ctx->inp.c,inp,16);
276 for (i=0; i<16/sizeof(size_t); ++i)
277 ctx->cmac.s[i] ^= (scratch.s[i] ^= ctx->inp.s[i]);
278 memcpy (out,scratch,16);
280 ctx->cmac.u[0] ^= (((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0]);
281 ctx->cmac.u[1] ^= (((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1]);
283 (*block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
291 (*block)(ctx->nonce.c,scratch.c,ctx->key);
292 for (i=0; i<len; ++len)
293 ctx->cmac.c[i] ^= (out[i] = scratch.c[i]^inp[i]);
294 (*block)(ctx->cmac.c,ctx->cmac.c,ctx->key);
297 for (i=15-L;i<16;++i)
300 (*block)(ctx->nonce.c,scratch.c,ctx->key);
301 ctx->cmac.u[0] ^= scratch.u[0];
302 ctx->cmac.u[1] ^= scratch.u[1];
304 ctx->nonce.c[0] = flags0;
309 size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx,unsigned char *tag,size_t len)
310 { unsigned int M = (ctx->nonce.c[0]>>3)&7; /* the M parameter */
314 memcpy(tag,ctx->cmac.c,M);