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| 1 /* crypto/bn/bn_mpi.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 <stdio.h> | |
| 60 #include "cryptlib.h" | |
| 61 #include "bn_lcl.h" | |
| 62 | |
| 63 int BN_bn2mpi(const BIGNUM *a, unsigned char *d) | |
| 64 { | |
| 65 int bits; | |
| 66 int num=0; | |
| 67 int ext=0; | |
| 68 long l; | |
| 69 | |
| 70 bits=BN_num_bits(a); | |
| 71 num=(bits+7)/8; | |
| 72 if (bits > 0) | |
| 73 { | |
| 74 ext=((bits & 0x07) == 0); | |
| 75 } | |
| 76 if (d == NULL) | |
| 77 return(num+4+ext); | |
| 78 | |
| 79 l=num+ext; | |
| 80 d[0]=(unsigned char)(l>>24)&0xff; | |
| 81 d[1]=(unsigned char)(l>>16)&0xff; | |
| 82 d[2]=(unsigned char)(l>> 8)&0xff; | |
| 83 d[3]=(unsigned char)(l )&0xff; | |
| 84 if (ext) d[4]=0; | |
| 85 num=BN_bn2bin(a,&(d[4+ext])); | |
| 86 if (a->neg) | |
| 87 d[4]|=0x80; | |
| 88 return(num+4+ext); | |
| 89 } | |
| 90 | |
| 91 BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *a) | |
| 92 { | |
| 93 long len; | |
| 94 int neg=0; | |
| 95 | |
| 96 if (n < 4) | |
| 97 { | |
| 98 BNerr(BN_F_BN_MPI2BN,BN_R_INVALID_LENGTH); | |
| 99 return(NULL); | |
| 100 } | |
| 101 len=((long)d[0]<<24)|((long)d[1]<<16)|((int)d[2]<<8)|(int)d[3]; | |
| 102 if ((len+4) != n) | |
| 103 { | |
| 104 BNerr(BN_F_BN_MPI2BN,BN_R_ENCODING_ERROR); | |
| 105 return(NULL); | |
| 106 } | |
| 107 | |
| 108 if (a == NULL) a=BN_new(); | |
| 109 if (a == NULL) return(NULL); | |
| 110 | |
| 111 if (len == 0) | |
| 112 { | |
| 113 a->neg=0; | |
| 114 a->top=0; | |
| 115 return(a); | |
| 116 } | |
| 117 d+=4; | |
| 118 if ((*d) & 0x80) | |
| 119 neg=1; | |
| 120 if (BN_bin2bn(d,(int)len,a) == NULL) | |
| 121 return(NULL); | |
| 122 a->neg=neg; | |
| 123 if (neg) | |
| 124 { | |
| 125 BN_clear_bit(a,BN_num_bits(a)-1); | |
| 126 } | |
| 127 bn_check_top(a); | |
| 128 return(a); | |
| 129 } | |
| 130 | |
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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