1/* 2 * Copyright (c) 2000-2001,2011,2014 Apple Inc. All Rights Reserved. 3 * 4 * The contents of this file constitute Original Code as defined in and are 5 * subject to the Apple Public Source License Version 1.2 (the 'License'). 6 * You may not use this file except in compliance with the License. Please obtain 7 * a copy of the License at http://www.apple.com/publicsource and read it before 8 * using this file. 9 * 10 * This Original Code and all software distributed under the License are 11 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS 12 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT 13 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 14 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the 15 * specific language governing rights and limitations under the License. 16 */ 17 18 19/* crypto/bn/bn_mpi.c */ 20/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 21 * All rights reserved. 22 * 23 * This package is an SSL implementation written 24 * by Eric Young (eay@cryptsoft.com). 25 * The implementation was written so as to conform with Netscapes SSL. 26 * 27 * This library is free for commercial and non-commercial use as long as 28 * the following conditions are aheared to. The following conditions 29 * apply to all code found in this distribution, be it the RC4, RSA, 30 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 31 * included with this distribution is covered by the same copyright terms 32 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 33 * 34 * Copyright remains Eric Young's, and as such any Copyright notices in 35 * the code are not to be removed. 36 * If this package is used in a product, Eric Young should be given attribution 37 * as the author of the parts of the library used. 38 * This can be in the form of a textual message at program startup or 39 * in documentation (online or textual) provided with the package. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * "This product includes cryptographic software written by 52 * Eric Young (eay@cryptsoft.com)" 53 * The word 'cryptographic' can be left out if the rouines from the library 54 * being used are not cryptographic related :-). 55 * 4. If you include any Windows specific code (or a derivative thereof) from 56 * the apps directory (application code) you must include an acknowledgement: 57 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 58 * 59 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * The licence and distribution terms for any publically available version or 72 * derivative of this code cannot be changed. i.e. this code cannot simply be 73 * copied and put under another distribution licence 74 * [including the GNU Public Licence.] 75 */ 76 77#include <stdio.h> 78#include "cryptlib.h" 79#include "bn_lcl.h" 80 81int BN_bn2mpi(const BIGNUM *a, unsigned char *d) 82 { 83 int bits; 84 int num=0; 85 int ext=0; 86 long l; 87 88 bits=BN_num_bits(a); 89 num=(bits+7)/8; 90 if (bits > 0) 91 { 92 ext=((bits & 0x07) == 0); 93 } 94 if (d == NULL) 95 return(num+4+ext); 96 97 l=num+ext; 98 d[0]=(unsigned char)(l>>24)&0xff; 99 d[1]=(unsigned char)(l>>16)&0xff; 100 d[2]=(unsigned char)(l>> 8)&0xff; 101 d[3]=(unsigned char)(l )&0xff; 102 if (ext) d[4]=0; 103 num=BN_bn2bin(a,&(d[4+ext])); 104 if (a->neg) 105 d[4]|=0x80; 106 return(num+4+ext); 107 } 108 109BIGNUM *BN_mpi2bn(unsigned char *d, int n, BIGNUM *a) 110 { 111 long len; 112 int neg=0; 113 114 if (n < 4) 115 { 116 BNerr(BN_F_BN_MPI2BN,BN_R_INVALID_LENGTH); 117 return(NULL); 118 } 119 len=((long)d[0]<<24)|((long)d[1]<<16)|((int)d[2]<<8)|(int)d[3]; 120 if ((len+4) != n) 121 { 122 BNerr(BN_F_BN_MPI2BN,BN_R_ENCODING_ERROR); 123 return(NULL); 124 } 125 126 if (a == NULL) a=BN_new(); 127 if (a == NULL) return(NULL); 128 129 if (len == 0) 130 { 131 a->neg=0; 132 a->top=0; 133 return(a); 134 } 135 d+=4; 136 if ((*d) & 0x80) 137 neg=1; 138 if (BN_bin2bn(d,(int)len,a) == NULL) 139 return(NULL); 140 a->neg=neg; 141 if (neg) 142 { 143 BN_clear_bit(a,BN_num_bits(a)-1); 144 } 145 return(a); 146 } 147 148