X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fbn%2Fbn_mpi.c;h=043e21d26a38c767ac9c4efb01de07f8c50c91bc;hp=53945c105717981d0330e0380400bc315f9bfb95;hb=c9fe362303fc54ff19bde7511475f28663f7d554;hpb=58964a492275ca9a59a0cd9c8155cb2491b4b909 diff --git a/crypto/bn/bn_mpi.c b/crypto/bn/bn_mpi.c index 53945c1057..043e21d26a 100644 --- a/crypto/bn/bn_mpi.c +++ b/crypto/bn/bn_mpi.c @@ -1,134 +1,86 @@ -/* crypto/bn/bn_mpi.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2016 The OpenSSL Project Authors. 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.] + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ #include -#include "cryptlib.h" +#include "internal/cryptlib.h" #include "bn_lcl.h" -int BN_bn2mpi(a,d) -BIGNUM *a; -unsigned char *d; - { - int bits; - int num=0; - int ext=0; - long l; +int BN_bn2mpi(const BIGNUM *a, unsigned char *d) +{ + int bits; + int num = 0; + int ext = 0; + long l; - bits=BN_num_bits(a); - num=(bits+7)/8; - if (bits > 0) - { - ext=((bits & 0x07) == 0); - } - if (d == NULL) - return(num+4+ext); + bits = BN_num_bits(a); + num = (bits + 7) / 8; + if (bits > 0) { + ext = ((bits & 0x07) == 0); + } + if (d == NULL) + return (num + 4 + ext); - l=num+ext; - d[0]=(unsigned char)(l>>24)&0xff; - d[1]=(unsigned char)(l>>16)&0xff; - d[2]=(unsigned char)(l>> 8)&0xff; - d[3]=(unsigned char)(l )&0xff; - if (ext) d[4]=0; - num=BN_bn2bin(a,&(d[4+ext])); - if (a->neg) - d[4]|=0x80; - return(num+4+ext); - } + l = num + ext; + d[0] = (unsigned char)(l >> 24) & 0xff; + d[1] = (unsigned char)(l >> 16) & 0xff; + d[2] = (unsigned char)(l >> 8) & 0xff; + d[3] = (unsigned char)(l) & 0xff; + if (ext) + d[4] = 0; + num = BN_bn2bin(a, &(d[4 + ext])); + if (a->neg) + d[4] |= 0x80; + return (num + 4 + ext); +} -BIGNUM *BN_mpi2bn(d,n,a) -unsigned char *d; -int n; -BIGNUM *a; - { - long len; - int neg=0; +BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *ain) +{ + long len; + int neg = 0; + BIGNUM *a = NULL; - if (n < 4) - { - BNerr(BN_F_BN_MPI2BN,BN_R_INVALID_LENGTH); - return(NULL); - } - len=(d[0]<<24)|(d[1]<<16)|(d[2]<<8)|d[3]; - if ((len+4) != n) - { - BNerr(BN_F_BN_MPI2BN,BN_R_ENCODING_ERROR); - return(NULL); - } + if (n < 4) { + BNerr(BN_F_BN_MPI2BN, BN_R_INVALID_LENGTH); + return NULL; + } + len = ((long)d[0] << 24) | ((long)d[1] << 16) | ((int)d[2] << 8) | (int) + d[3]; + if ((len + 4) != n) { + BNerr(BN_F_BN_MPI2BN, BN_R_ENCODING_ERROR); + return NULL; + } - if (a == NULL) a=BN_new(); - if (a == NULL) return(NULL); + if (ain == NULL) + a = BN_new(); + else + a = ain; - if (len == 0) - { - a->neg=0; - a->top=0; - return(a); - } - d+=4; - if ((*d) & 0x80) - neg=1; - if (BN_bin2bn(d,(int)len,a) == NULL) - return(NULL); - a->neg=neg; - if (neg) - { - BN_clear_bit(a,BN_num_bits(a)-1); - } - return(a); - } + if (a == NULL) + return NULL; + if (len == 0) { + a->neg = 0; + a->top = 0; + return a; + } + d += 4; + if ((*d) & 0x80) + neg = 1; + if (BN_bin2bn(d, (int)len, a) == NULL) { + if (ain == NULL) + BN_free(a); + return NULL; + } + a->neg = neg; + if (neg) { + BN_clear_bit(a, BN_num_bits(a) - 1); + } + bn_check_top(a); + return a; +}