android / platform / external / openssl / d5c373afc65386fed2556d07821c57f672843921 / . / crypto / camellia / cmll_cfb.c

/* crypto/camellia/camellia_cfb.c -*- mode:C; c-file-style: "eay" -*- */ | |

/* ==================================================================== | |

* Copyright (c) 2006 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 | |

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* ==================================================================== | |

* | |

*/ | |

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |

* All rights reserved. | |

* | |

* This package is an SSL implementation written | |

* by Eric Young (eay@cryptsoft.com). | |

* The implementation was written so as to conform with Netscapes SSL. | |

* | |

* This library is free for commercial and non-commercial use as long as | |

* the following conditions are aheared to. The following conditions | |

* apply to all code found in this distribution, be it the RC4, RSA, | |

* lhash, DES, etc., code; not just the SSL code. The SSL documentation | |

* included with this distribution is covered by the same copyright terms | |

* except that the holder is Tim Hudson (tjh@cryptsoft.com). | |

* | |

* Copyright remains Eric Young's, and as such any Copyright notices in | |

* the code are not to be removed. | |

* If this package is used in a product, Eric Young should be given attribution | |

* as the author of the parts of the library used. | |

* This can be in the form of a textual message at program startup or | |

* in documentation (online or textual) provided with the package. | |

* | |

* 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 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 acknowledgement: | |

* "This product includes cryptographic software written by | |

* Eric Young (eay@cryptsoft.com)" | |

* The word 'cryptographic' can be left out if the rouines from the library | |

* being used are not cryptographic related :-). | |

* 4. If you include any Windows specific code (or a derivative thereof) from | |

* the apps directory (application code) you must include an acknowledgement: | |

* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |

* | |

* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |

* ANY EXPRESS 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 AUTHOR OR 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. | |

* | |

* The licence and distribution terms for any publically available version or | |

* derivative of this code cannot be changed. i.e. this code cannot simply be | |

* copied and put under another distribution licence | |

* [including the GNU Public Licence.] | |

*/ | |

#ifndef CAMELLIA_DEBUG | |

# ifndef NDEBUG | |

# define NDEBUG | |

# endif | |

#endif | |

#include <assert.h> | |

#include <string.h> | |

#include <openssl/camellia.h> | |

#include "cmll_locl.h" | |

#include "e_os.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 Camellia_cfb128_encrypt(const unsigned char *in, unsigned char *out, | |

const unsigned long length, const CAMELLIA_KEY *key, | |

unsigned char *ivec, int *num, const int enc) | |

{ | |

unsigned int n; | |

unsigned long l = length; | |

unsigned char c; | |

assert(in && out && key && ivec && num); | |

n = *num; | |

if (enc) | |

{ | |

while (l--) | |

{ | |

if (n == 0) | |

{ | |

Camellia_encrypt(ivec, ivec, key); | |

} | |

ivec[n] = *(out++) = *(in++) ^ ivec[n]; | |

n = (n+1) % CAMELLIA_BLOCK_SIZE; | |

} | |

} | |

else | |

{ | |

while (l--) | |

{ | |

if (n == 0) | |

{ | |

Camellia_encrypt(ivec, ivec, key); | |

} | |

c = *(in); | |

*(out++) = *(in++) ^ ivec[n]; | |

ivec[n] = c; | |

n = (n+1) % CAMELLIA_BLOCK_SIZE; | |

} | |

} | |

*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 */ | |

void Camellia_cfbr_encrypt_block(const unsigned char *in,unsigned char *out, | |

const int nbits,const CAMELLIA_KEY *key, | |

unsigned char *ivec,const int enc) | |

{ | |

int n,rem,num; | |

unsigned char ovec[CAMELLIA_BLOCK_SIZE*2]; | |

if (nbits<=0 || nbits>128) return; | |

/* fill in the first half of the new IV with the current IV */ | |

memcpy(ovec,ivec,CAMELLIA_BLOCK_SIZE); | |

/* construct the new IV */ | |

Camellia_encrypt(ivec,ivec,key); | |

num = (nbits+7)/8; | |

if (enc) /* encrypt the input */ | |

for(n=0 ; n < num ; ++n) | |

out[n] = (ovec[CAMELLIA_BLOCK_SIZE+n] = in[n] ^ ivec[n]); | |

else /* decrypt the input */ | |

for(n=0 ; n < num ; ++n) | |

out[n] = (ovec[CAMELLIA_BLOCK_SIZE+n] = in[n]) ^ ivec[n]; | |

/* shift ovec left... */ | |

rem = nbits%8; | |

num = nbits/8; | |

if(rem==0) | |

memcpy(ivec,ovec+num,CAMELLIA_BLOCK_SIZE); | |

else | |

for(n=0 ; n < CAMELLIA_BLOCK_SIZE ; ++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 Camellia_cfb1_encrypt(const unsigned char *in, unsigned char *out, | |

const unsigned long length, const CAMELLIA_KEY *key, | |

unsigned char *ivec, int *num, const int enc) | |

{ | |

unsigned int n; | |

unsigned char c[1],d[1]; | |

assert(in && out && key && ivec && num); | |

assert(*num == 0); | |

memset(out,0,(length+7)/8); | |

for(n=0 ; n < length ; ++n) | |

{ | |

c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0; | |

Camellia_cfbr_encrypt_block(c,d,1,key,ivec,enc); | |

out[n/8]=(out[n/8]&~(1 << (7-n%8)))|((d[0]&0x80) >> (n%8)); | |

} | |

} | |

void Camellia_cfb8_encrypt(const unsigned char *in, unsigned char *out, | |

const unsigned long length, const CAMELLIA_KEY *key, | |

unsigned char *ivec, int *num, const int enc) | |

{ | |

unsigned int n; | |

assert(in && out && key && ivec && num); | |

assert(*num == 0); | |

for(n=0 ; n < length ; ++n) | |

Camellia_cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc); | |

} | |