Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/modes/cfb128.c

-/* ====================================================================
- * 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 <openssl/crypto.h>
-#include "modes_lcl.h"
-#include <string.h>
-
-#ifndef MODES_DEBUG
-# ifndef NDEBUG
-#  define NDEBUG
-# endif
-#endif
-#include <assert.h>
-
-/* 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);
-}
-