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-rw-r--r--openssl/crypto/modes/ccm128.c441
1 files changed, 441 insertions, 0 deletions
diff --git a/openssl/crypto/modes/ccm128.c b/openssl/crypto/modes/ccm128.c
new file mode 100644
index 000000000..c9b35e5b3
--- /dev/null
+++ b/openssl/crypto/modes/ccm128.c
@@ -0,0 +1,441 @@
+/* ====================================================================
+ * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#include <openssl/crypto.h>
+#include "modes_lcl.h"
+#include <string.h>
+
+#ifndef MODES_DEBUG
+# ifndef NDEBUG
+# define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
+/* First you setup M and L parameters and pass the key schedule.
+ * This is called once per session setup... */
+void CRYPTO_ccm128_init(CCM128_CONTEXT *ctx,
+ unsigned int M,unsigned int L,void *key,block128_f block)
+{
+ memset(ctx->nonce.c,0,sizeof(ctx->nonce.c));
+ ctx->nonce.c[0] = ((u8)(L-1)&7) | (u8)(((M-2)/2)&7)<<3;
+ ctx->blocks = 0;
+ ctx->block = block;
+ ctx->key = key;
+}
+
+/* !!! Following interfaces are to be called *once* per packet !!! */
+
+/* Then you setup per-message nonce and pass the length of the message */
+int CRYPTO_ccm128_setiv(CCM128_CONTEXT *ctx,
+ const unsigned char *nonce,size_t nlen,size_t mlen)
+{
+ unsigned int L = ctx->nonce.c[0]&7; /* the L parameter */
+
+ if (nlen<(14-L)) return -1; /* nonce is too short */
+
+ if (sizeof(mlen)==8 && L>=3) {
+ ctx->nonce.c[8] = (u8)(mlen>>(56%(sizeof(mlen)*8)));
+ ctx->nonce.c[9] = (u8)(mlen>>(48%(sizeof(mlen)*8)));
+ ctx->nonce.c[10] = (u8)(mlen>>(40%(sizeof(mlen)*8)));
+ ctx->nonce.c[11] = (u8)(mlen>>(32%(sizeof(mlen)*8)));
+ }
+ else
+ *(u32*)(&ctx->nonce.c[8]) = 0;
+
+ ctx->nonce.c[12] = (u8)(mlen>>24);
+ ctx->nonce.c[13] = (u8)(mlen>>16);
+ ctx->nonce.c[14] = (u8)(mlen>>8);
+ ctx->nonce.c[15] = (u8)mlen;
+
+ ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
+ memcpy(&ctx->nonce.c[1],nonce,14-L);
+
+ return 0;
+}
+
+/* Then you pass additional authentication data, this is optional */
+void CRYPTO_ccm128_aad(CCM128_CONTEXT *ctx,
+ const unsigned char *aad,size_t alen)
+{ unsigned int i;
+ block128_f block = ctx->block;
+
+ if (alen==0) return;
+
+ ctx->nonce.c[0] |= 0x40; /* set Adata flag */
+ (*block)(ctx->nonce.c,ctx->cmac.c,ctx->key),
+ ctx->blocks++;
+
+ if (alen<(0x10000-0x100)) {
+ ctx->cmac.c[0] ^= (u8)(alen>>8);
+ ctx->cmac.c[1] ^= (u8)alen;
+ i=2;
+ }
+ else if (sizeof(alen)==8 && alen>=(size_t)1<<(32%(sizeof(alen)*8))) {
+ ctx->cmac.c[0] ^= 0xFF;
+ ctx->cmac.c[1] ^= 0xFF;
+ ctx->cmac.c[2] ^= (u8)(alen>>(56%(sizeof(alen)*8)));
+ ctx->cmac.c[3] ^= (u8)(alen>>(48%(sizeof(alen)*8)));
+ ctx->cmac.c[4] ^= (u8)(alen>>(40%(sizeof(alen)*8)));
+ ctx->cmac.c[5] ^= (u8)(alen>>(32%(sizeof(alen)*8)));
+ ctx->cmac.c[6] ^= (u8)(alen>>24);
+ ctx->cmac.c[7] ^= (u8)(alen>>16);
+ ctx->cmac.c[8] ^= (u8)(alen>>8);
+ ctx->cmac.c[9] ^= (u8)alen;
+ i=10;
+ }
+ else {
+ ctx->cmac.c[0] ^= 0xFF;
+ ctx->cmac.c[1] ^= 0xFE;
+ ctx->cmac.c[2] ^= (u8)(alen>>24);
+ ctx->cmac.c[3] ^= (u8)(alen>>16);
+ ctx->cmac.c[4] ^= (u8)(alen>>8);
+ ctx->cmac.c[5] ^= (u8)alen;
+ i=6;
+ }
+
+ do {
+ for(;i<16 && alen;++i,++aad,--alen)
+ ctx->cmac.c[i] ^= *aad;
+ (*block)(ctx->cmac.c,ctx->cmac.c,ctx->key),
+ ctx->blocks++;
+ i=0;
+ } while (alen);
+}
+
+/* Finally you encrypt or decrypt the message */
+
+/* counter part of nonce may not be larger than L*8 bits,
+ * L is not larger than 8, therefore 64-bit counter... */
+static void ctr64_inc(unsigned char *counter) {
+ unsigned int n=8;
+ u8 c;
+
+ counter += 8;
+ do {
+ --n;
+ c = counter[n];
+ ++c;
+ counter[n] = c;
+ if (c) return;
+ } while (n);
+}
+
+int CRYPTO_ccm128_encrypt(CCM128_CONTEXT *ctx,
+ const unsigned char *inp, unsigned char *out,
+ size_t len)
+{
+ size_t n;
+ unsigned int i,L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void * key = ctx->key;
+ union { u64 u[2]; u8 c[16]; } scratch;
+
+ if (!(flags0&0x40))
+ (*block)(ctx->nonce.c,ctx->cmac.c,key),
+ ctx->blocks++;
+
+ ctx->nonce.c[0] = L = flags0&7;
+ for (n=0,i=15-L;i<15;++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i]=0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15]=1;
+
+ if (n!=len) return -1; /* length mismatch */
+
+ ctx->blocks += ((len+15)>>3)|1;
+ if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
+
+ while (len>=16) {
+#if defined(STRICT_ALIGNMENT)
+ union { u64 u[2]; u8 c[16]; } temp;
+
+ memcpy (temp.c,inp,16);
+ ctx->cmac.u[0] ^= temp.u[0];
+ ctx->cmac.u[1] ^= temp.u[1];
+#else
+ ctx->cmac.u[0] ^= ((u64*)inp)[0];
+ ctx->cmac.u[1] ^= ((u64*)inp)[1];
+#endif
+ (*block)(ctx->cmac.c,ctx->cmac.c,key);
+ (*block)(ctx->nonce.c,scratch.c,key);
+ ctr64_inc(ctx->nonce.c);
+#if defined(STRICT_ALIGNMENT)
+ temp.u[0] ^= scratch.u[0];
+ temp.u[1] ^= scratch.u[1];
+ memcpy(out,temp.c,16);
+#else
+ ((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0];
+ ((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1];
+#endif
+ inp += 16;
+ out += 16;
+ len -= 16;
+ }
+
+ if (len) {
+ for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
+ (*block)(ctx->cmac.c,ctx->cmac.c,key);
+ (*block)(ctx->nonce.c,scratch.c,key);
+ for (i=0; i<len; ++i) out[i] = scratch.c[i]^inp[i];
+ }
+
+ for (i=15-L;i<16;++i)
+ ctx->nonce.c[i]=0;
+
+ (*block)(ctx->nonce.c,scratch.c,key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
+
+ ctx->nonce.c[0] = flags0;
+
+ return 0;
+}
+
+int CRYPTO_ccm128_decrypt(CCM128_CONTEXT *ctx,
+ const unsigned char *inp, unsigned char *out,
+ size_t len)
+{
+ size_t n;
+ unsigned int i,L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void * key = ctx->key;
+ union { u64 u[2]; u8 c[16]; } scratch;
+
+ if (!(flags0&0x40))
+ (*block)(ctx->nonce.c,ctx->cmac.c,key);
+
+ ctx->nonce.c[0] = L = flags0&7;
+ for (n=0,i=15-L;i<15;++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i]=0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15]=1;
+
+ if (n!=len) return -1;
+
+ while (len>=16) {
+#if defined(STRICT_ALIGNMENT)
+ union { u64 u[2]; u8 c[16]; } temp;
+#endif
+ (*block)(ctx->nonce.c,scratch.c,key);
+ ctr64_inc(ctx->nonce.c);
+#if defined(STRICT_ALIGNMENT)
+ memcpy (temp.c,inp,16);
+ ctx->cmac.u[0] ^= (scratch.u[0] ^= temp.u[0]);
+ ctx->cmac.u[1] ^= (scratch.u[1] ^= temp.u[1]);
+ memcpy (out,scratch.c,16);
+#else
+ ctx->cmac.u[0] ^= (((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0]);
+ ctx->cmac.u[1] ^= (((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1]);
+#endif
+ (*block)(ctx->cmac.c,ctx->cmac.c,key);
+
+ inp += 16;
+ out += 16;
+ len -= 16;
+ }
+
+ if (len) {
+ (*block)(ctx->nonce.c,scratch.c,key);
+ for (i=0; i<len; ++i)
+ ctx->cmac.c[i] ^= (out[i] = scratch.c[i]^inp[i]);
+ (*block)(ctx->cmac.c,ctx->cmac.c,key);
+ }
+
+ for (i=15-L;i<16;++i)
+ ctx->nonce.c[i]=0;
+
+ (*block)(ctx->nonce.c,scratch.c,key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
+
+ ctx->nonce.c[0] = flags0;
+
+ return 0;
+}
+
+static void ctr64_add (unsigned char *counter,size_t inc)
+{ size_t n=8, val=0;
+
+ counter += 8;
+ do {
+ --n;
+ val += counter[n] + (inc&0xff);
+ counter[n] = (unsigned char)val;
+ val >>= 8; /* carry bit */
+ inc >>= 8;
+ } while(n && (inc || val));
+}
+
+int CRYPTO_ccm128_encrypt_ccm64(CCM128_CONTEXT *ctx,
+ const unsigned char *inp, unsigned char *out,
+ size_t len,ccm128_f stream)
+{
+ size_t n;
+ unsigned int i,L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void * key = ctx->key;
+ union { u64 u[2]; u8 c[16]; } scratch;
+
+ if (!(flags0&0x40))
+ (*block)(ctx->nonce.c,ctx->cmac.c,key),
+ ctx->blocks++;
+
+ ctx->nonce.c[0] = L = flags0&7;
+ for (n=0,i=15-L;i<15;++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i]=0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15]=1;
+
+ if (n!=len) return -1; /* length mismatch */
+
+ ctx->blocks += ((len+15)>>3)|1;
+ if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
+
+ if ((n=len/16)) {
+ (*stream)(inp,out,n,key,ctx->nonce.c,ctx->cmac.c);
+ n *= 16;
+ inp += n;
+ out += n;
+ len -= n;
+ if (len) ctr64_add(ctx->nonce.c,n/16);
+ }
+
+ if (len) {
+ for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
+ (*block)(ctx->cmac.c,ctx->cmac.c,key);
+ (*block)(ctx->nonce.c,scratch.c,key);
+ for (i=0; i<len; ++i) out[i] = scratch.c[i]^inp[i];
+ }
+
+ for (i=15-L;i<16;++i)
+ ctx->nonce.c[i]=0;
+
+ (*block)(ctx->nonce.c,scratch.c,key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
+
+ ctx->nonce.c[0] = flags0;
+
+ return 0;
+}
+
+int CRYPTO_ccm128_decrypt_ccm64(CCM128_CONTEXT *ctx,
+ const unsigned char *inp, unsigned char *out,
+ size_t len,ccm128_f stream)
+{
+ size_t n;
+ unsigned int i,L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void * key = ctx->key;
+ union { u64 u[2]; u8 c[16]; } scratch;
+
+ if (!(flags0&0x40))
+ (*block)(ctx->nonce.c,ctx->cmac.c,key);
+
+ ctx->nonce.c[0] = L = flags0&7;
+ for (n=0,i=15-L;i<15;++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i]=0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15]=1;
+
+ if (n!=len) return -1;
+
+ if ((n=len/16)) {
+ (*stream)(inp,out,n,key,ctx->nonce.c,ctx->cmac.c);
+ n *= 16;
+ inp += n;
+ out += n;
+ len -= n;
+ if (len) ctr64_add(ctx->nonce.c,n/16);
+ }
+
+ if (len) {
+ (*block)(ctx->nonce.c,scratch.c,key);
+ for (i=0; i<len; ++i)
+ ctx->cmac.c[i] ^= (out[i] = scratch.c[i]^inp[i]);
+ (*block)(ctx->cmac.c,ctx->cmac.c,key);
+ }
+
+ for (i=15-L;i<16;++i)
+ ctx->nonce.c[i]=0;
+
+ (*block)(ctx->nonce.c,scratch.c,key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
+
+ ctx->nonce.c[0] = flags0;
+
+ return 0;
+}
+
+size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx,unsigned char *tag,size_t len)
+{ unsigned int M = (ctx->nonce.c[0]>>3)&7; /* the M parameter */
+
+ M *= 2; M += 2;
+ if (len<M) return 0;
+ memcpy(tag,ctx->cmac.c,M);
+ return M;
+}
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