Index: openssl/crypto/modes/cfb128.c |
=================================================================== |
--- openssl/crypto/modes/cfb128.c (revision 0) |
+++ openssl/crypto/modes/cfb128.c (revision 0) |
@@ -0,0 +1,249 @@ |
+/* ==================================================================== |
+ * Copyright (c) 2008 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 "modes.h" |
+#include <string.h> |
+ |
+#ifndef MODES_DEBUG |
+# ifndef NDEBUG |
+# define NDEBUG |
+# endif |
+#endif |
+#include <assert.h> |
+ |
+#define STRICT_ALIGNMENT |
+#if defined(__i386) || defined(__i386__) || \ |
+ defined(__x86_64) || defined(__x86_64__) || \ |
+ defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \ |
+ defined(__s390__) || defined(__s390x__) |
+# undef STRICT_ALIGNMENT |
+#endif |
+ |
+/* The input and output encrypted as though 128bit cfb mode is being |
+ * used. The extra state information to record how much of the |
+ * 128bit block we have used is contained in *num; |
+ */ |
+void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out, |
+ size_t len, const void *key, |
+ unsigned char ivec[16], int *num, |
+ int enc, block128_f block) |
+{ |
+ unsigned int n; |
+ size_t l = 0; |
+ |
+ assert(in && out && key && ivec && num); |
+ |
+ n = *num; |
+ |
+ if (enc) { |
+#if !defined(OPENSSL_SMALL_FOOTPRINT) |
+ if (16%sizeof(size_t) == 0) do { /* always true actually */ |
+ while (n && len) { |
+ *(out++) = ivec[n] ^= *(in++); |
+ --len; |
+ n = (n+1) % 16; |
+ } |
+#if defined(STRICT_ALIGNMENT) |
+ if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) |
+ break; |
+#endif |
+ while (len>=16) { |
+ (*block)(ivec, ivec, key); |
+ for (; n<16; n+=sizeof(size_t)) { |
+ *(size_t*)(out+n) = |
+ *(size_t*)(ivec+n) ^= *(size_t*)(in+n); |
+ } |
+ len -= 16; |
+ out += 16; |
+ in += 16; |
+ n = 0; |
+ } |
+ if (len) { |
+ (*block)(ivec, ivec, key); |
+ while (len--) { |
+ out[n] = ivec[n] ^= in[n]; |
+ ++n; |
+ } |
+ } |
+ *num = n; |
+ return; |
+ } while (0); |
+ /* the rest would be commonly eliminated by x86* compiler */ |
+#endif |
+ while (l<len) { |
+ if (n == 0) { |
+ (*block)(ivec, ivec, key); |
+ } |
+ out[l] = ivec[n] ^= in[l]; |
+ ++l; |
+ n = (n+1) % 16; |
+ } |
+ *num = n; |
+ } else { |
+#if !defined(OPENSSL_SMALL_FOOTPRINT) |
+ if (16%sizeof(size_t) == 0) do { /* always true actually */ |
+ while (n && len) { |
+ unsigned char c; |
+ *(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c; |
+ --len; |
+ n = (n+1) % 16; |
+ } |
+#if defined(STRICT_ALIGNMENT) |
+ if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) |
+ break; |
+#endif |
+ while (len>=16) { |
+ (*block)(ivec, ivec, key); |
+ for (; n<16; n+=sizeof(size_t)) { |
+ size_t t = *(size_t*)(in+n); |
+ *(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t; |
+ *(size_t*)(ivec+n) = t; |
+ } |
+ len -= 16; |
+ out += 16; |
+ in += 16; |
+ n = 0; |
+ } |
+ if (len) { |
+ (*block)(ivec, ivec, key); |
+ while (len--) { |
+ unsigned char c; |
+ out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c; |
+ ++n; |
+ } |
+ } |
+ *num = n; |
+ return; |
+ } while (0); |
+ /* the rest would be commonly eliminated by x86* compiler */ |
+#endif |
+ while (l<len) { |
+ unsigned char c; |
+ if (n == 0) { |
+ (*block)(ivec, ivec, key); |
+ } |
+ out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c; |
+ ++l; |
+ n = (n+1) % 16; |
+ } |
+ *num=n; |
+ } |
+} |
+ |
+/* This expects a single block of size nbits for both in and out. Note that |
+ it corrupts any extra bits in the last byte of out */ |
+static void cfbr_encrypt_block(const unsigned char *in,unsigned char *out, |
+ int nbits,const void *key, |
+ unsigned char ivec[16],int enc, |
+ block128_f block) |
+{ |
+ int n,rem,num; |
+ unsigned char ovec[16*2 + 1]; /* +1 because we dererefence (but don't use) one byte off the end */ |
+ |
+ if (nbits<=0 || nbits>128) return; |
+ |
+ /* fill in the first half of the new IV with the current IV */ |
+ memcpy(ovec,ivec,16); |
+ /* construct the new IV */ |
+ (*block)(ivec,ivec,key); |
+ num = (nbits+7)/8; |
+ if (enc) /* encrypt the input */ |
+ for(n=0 ; n < num ; ++n) |
+ out[n] = (ovec[16+n] = in[n] ^ ivec[n]); |
+ else /* decrypt the input */ |
+ for(n=0 ; n < num ; ++n) |
+ out[n] = (ovec[16+n] = in[n]) ^ ivec[n]; |
+ /* shift ovec left... */ |
+ rem = nbits%8; |
+ num = nbits/8; |
+ if(rem==0) |
+ memcpy(ivec,ovec+num,16); |
+ else |
+ for(n=0 ; n < 16 ; ++n) |
+ ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem); |
+ |
+ /* it is not necessary to cleanse ovec, since the IV is not secret */ |
+} |
+ |
+/* N.B. This expects the input to be packed, MS bit first */ |
+void CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out, |
+ size_t bits, const void *key, |
+ unsigned char ivec[16], int *num, |
+ int enc, block128_f block) |
+{ |
+ size_t n; |
+ unsigned char c[1],d[1]; |
+ |
+ assert(in && out && key && ivec && num); |
+ assert(*num == 0); |
+ |
+ for(n=0 ; n<bits ; ++n) |
+ { |
+ c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0; |
+ cfbr_encrypt_block(c,d,1,key,ivec,enc,block); |
+ out[n/8]=(out[n/8]&~(1 << (unsigned int)(7-n%8))) | |
+ ((d[0]&0x80) >> (unsigned int)(n%8)); |
+ } |
+} |
+ |
+void CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out, |
+ size_t length, const void *key, |
+ unsigned char ivec[16], int *num, |
+ int enc, block128_f block) |
+{ |
+ size_t n; |
+ |
+ assert(in && out && key && ivec && num); |
+ assert(*num == 0); |
+ |
+ for(n=0 ; n<length ; ++n) |
+ cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc,block); |
+} |
+ |