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| 1 /* crypto/des/ofb_enc.c */ | |
| 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * This package is an SSL implementation written | |
| 6 * by Eric Young (eay@cryptsoft.com). | |
| 7 * The implementation was written so as to conform with Netscapes SSL. | |
| 8 * | |
| 9 * This library is free for commercial and non-commercial use as long as | |
| 10 * the following conditions are aheared to. The following conditions | |
| 11 * apply to all code found in this distribution, be it the RC4, RSA, | |
| 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
| 13 * included with this distribution is covered by the same copyright terms | |
| 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
| 15 * | |
| 16 * Copyright remains Eric Young's, and as such any Copyright notices in | |
| 17 * the code are not to be removed. | |
| 18 * If this package is used in a product, Eric Young should be given attribution | |
| 19 * as the author of the parts of the library used. | |
| 20 * This can be in the form of a textual message at program startup or | |
| 21 * in documentation (online or textual) provided with the package. | |
| 22 * | |
| 23 * Redistribution and use in source and binary forms, with or without | |
| 24 * modification, are permitted provided that the following conditions | |
| 25 * are met: | |
| 26 * 1. Redistributions of source code must retain the copyright | |
| 27 * notice, this list of conditions and the following disclaimer. | |
| 28 * 2. Redistributions in binary form must reproduce the above copyright | |
| 29 * notice, this list of conditions and the following disclaimer in the | |
| 30 * documentation and/or other materials provided with the distribution. | |
| 31 * 3. All advertising materials mentioning features or use of this software | |
| 32 * must display the following acknowledgement: | |
| 33 * "This product includes cryptographic software written by | |
| 34 * Eric Young (eay@cryptsoft.com)" | |
| 35 * The word 'cryptographic' can be left out if the rouines from the library | |
| 36 * being used are not cryptographic related :-). | |
| 37 * 4. If you include any Windows specific code (or a derivative thereof) from | |
| 38 * the apps directory (application code) you must include an acknowledgement: | |
| 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
| 40 * | |
| 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
| 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 51 * SUCH DAMAGE. | |
| 52 * | |
| 53 * The licence and distribution terms for any publically available version or | |
| 54 * derivative of this code cannot be changed. i.e. this code cannot simply be | |
| 55 * copied and put under another distribution licence | |
| 56 * [including the GNU Public Licence.] | |
| 57 */ | |
| 58 | |
| 59 #include "des_locl.h" | |
| 60 | |
| 61 /* The input and output are loaded in multiples of 8 bits. | |
| 62 * What this means is that if you hame numbits=12 and length=2 | |
| 63 * the first 12 bits will be retrieved from the first byte and half | |
| 64 * the second. The second 12 bits will come from the 3rd and half the 4th | |
| 65 * byte. | |
| 66 */ | |
| 67 void DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits, | |
| 68 long length, DES_key_schedule *schedule, | |
| 69 DES_cblock *ivec) | |
| 70 { | |
| 71 register DES_LONG d0,d1,vv0,vv1,v0,v1,n=(numbits+7)/8; | |
| 72 register DES_LONG mask0,mask1; | |
| 73 register long l=length; | |
| 74 register int num=numbits; | |
| 75 DES_LONG ti[2]; | |
| 76 unsigned char *iv; | |
| 77 | |
| 78 if (num > 64) return; | |
| 79 if (num > 32) | |
| 80 { | |
| 81 mask0=0xffffffffL; | |
| 82 if (num >= 64) | |
| 83 mask1=mask0; | |
| 84 else | |
| 85 mask1=(1L<<(num-32))-1; | |
| 86 } | |
| 87 else | |
| 88 { | |
| 89 if (num == 32) | |
| 90 mask0=0xffffffffL; | |
| 91 else | |
| 92 mask0=(1L<<num)-1; | |
| 93 mask1=0x00000000L; | |
| 94 } | |
| 95 | |
| 96 iv = &(*ivec)[0]; | |
| 97 c2l(iv,v0); | |
| 98 c2l(iv,v1); | |
| 99 ti[0]=v0; | |
| 100 ti[1]=v1; | |
| 101 while (l-- > 0) | |
| 102 { | |
| 103 ti[0]=v0; | |
| 104 ti[1]=v1; | |
| 105 DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); | |
| 106 vv0=ti[0]; | |
| 107 vv1=ti[1]; | |
| 108 c2ln(in,d0,d1,n); | |
| 109 in+=n; | |
| 110 d0=(d0^vv0)&mask0; | |
| 111 d1=(d1^vv1)&mask1; | |
| 112 l2cn(d0,d1,out,n); | |
| 113 out+=n; | |
| 114 | |
| 115 if (num == 32) | |
| 116 { v0=v1; v1=vv0; } | |
| 117 else if (num == 64) | |
| 118 { v0=vv0; v1=vv1; } | |
| 119 else if (num > 32) /* && num != 64 */ | |
| 120 { | |
| 121 v0=((v1>>(num-32))|(vv0<<(64-num)))&0xffffffffL; | |
| 122 v1=((vv0>>(num-32))|(vv1<<(64-num)))&0xffffffffL; | |
| 123 } | |
| 124 else /* num < 32 */ | |
| 125 { | |
| 126 v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL; | |
| 127 v1=((v1>>num)|(vv0<<(32-num)))&0xffffffffL; | |
| 128 } | |
| 129 } | |
| 130 iv = &(*ivec)[0]; | |
| 131 l2c(v0,iv); | |
| 132 l2c(v1,iv); | |
| 133 v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0; | |
| 134 } | |
| 135 | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master