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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/crypto/bn/bn_add.c | |
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Checked in the following released items:
xkeyboard-config-1.4.tar.gz
ttf-bitstream-vera-1.10.tar.gz
font-alias-1.0.1.tar.gz
font-sun-misc-1.0.0.tar.gz
font-sun-misc-1.0.0.tar.gz
font-sony-misc-1.0.0.tar.gz
font-schumacher-misc-1.0.0.tar.gz
font-mutt-misc-1.0.0.tar.gz
font-misc-misc-1.0.0.tar.gz
font-misc-meltho-1.0.0.tar.gz
font-micro-misc-1.0.0.tar.gz
font-jis-misc-1.0.0.tar.gz
font-isas-misc-1.0.0.tar.gz
font-dec-misc-1.0.0.tar.gz
font-daewoo-misc-1.0.0.tar.gz
font-cursor-misc-1.0.0.tar.gz
font-arabic-misc-1.0.0.tar.gz
font-winitzki-cyrillic-1.0.0.tar.gz
font-misc-cyrillic-1.0.0.tar.gz
font-cronyx-cyrillic-1.0.0.tar.gz
font-screen-cyrillic-1.0.1.tar.gz
font-xfree86-type1-1.0.1.tar.gz
font-adobe-utopia-type1-1.0.1.tar.gz
font-ibm-type1-1.0.0.tar.gz
font-bitstream-type1-1.0.0.tar.gz
font-bitstream-speedo-1.0.0.tar.gz
font-bh-ttf-1.0.0.tar.gz
font-bh-type1-1.0.0.tar.gz
font-bitstream-100dpi-1.0.0.tar.gz
font-bh-lucidatypewriter-100dpi-1.0.0.tar.gz
font-bh-100dpi-1.0.0.tar.gz
font-adobe-utopia-100dpi-1.0.1.tar.gz
font-adobe-100dpi-1.0.0.tar.gz
font-util-1.0.1.tar.gz
font-bitstream-75dpi-1.0.0.tar.gz
font-bh-lucidatypewriter-75dpi-1.0.0.tar.gz
font-adobe-utopia-75dpi-1.0.1.tar.gz
font-bh-75dpi-1.0.0.tar.gz
bdftopcf-1.0.1.tar.gz
font-adobe-75dpi-1.0.0.tar.gz
mkfontscale-1.0.6.tar.gz
openssl-0.9.8k.tar.gz
bigreqsproto-1.0.2.tar.gz
xtrans-1.2.2.tar.gz
resourceproto-1.0.2.tar.gz
inputproto-1.4.4.tar.gz
compositeproto-0.4.tar.gz
damageproto-1.1.0.tar.gz
zlib-1.2.3.tar.gz
xkbcomp-1.0.5.tar.gz
freetype-2.3.9.tar.gz
pthreads-w32-2-8-0-release.tar.gz
pixman-0.12.0.tar.gz
kbproto-1.0.3.tar.gz
evieext-1.0.2.tar.gz
fixesproto-4.0.tar.gz
recordproto-1.13.2.tar.gz
randrproto-1.2.2.tar.gz
scrnsaverproto-1.1.0.tar.gz
renderproto-0.9.3.tar.gz
xcmiscproto-1.1.2.tar.gz
fontsproto-2.0.2.tar.gz
xextproto-7.0.3.tar.gz
xproto-7.0.14.tar.gz
libXdmcp-1.0.2.tar.gz
libxkbfile-1.0.5.tar.gz
libfontenc-1.0.4.tar.gz
libXfont-1.3.4.tar.gz
libX11-1.1.5.tar.gz
libXau-1.0.4.tar.gz
libxcb-1.1.tar.gz
xorg-server-1.5.3.tar.gz
Diffstat (limited to 'openssl/crypto/bn/bn_add.c')
-rw-r--r-- | openssl/crypto/bn/bn_add.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/openssl/crypto/bn/bn_add.c b/openssl/crypto/bn/bn_add.c new file mode 100644 index 000000000..940516370 --- /dev/null +++ b/openssl/crypto/bn/bn_add.c @@ -0,0 +1,313 @@ +/* crypto/bn/bn_add.c */ +/* 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.] + */ + +#include <stdio.h> +#include "cryptlib.h" +#include "bn_lcl.h" + +/* r can == a or b */ +int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b) + { + const BIGNUM *tmp; + int a_neg = a->neg, ret; + + bn_check_top(a); + bn_check_top(b); + + /* a + b a+b + * a + -b a-b + * -a + b b-a + * -a + -b -(a+b) + */ + if (a_neg ^ b->neg) + { + /* only one is negative */ + if (a_neg) + { tmp=a; a=b; b=tmp; } + + /* we are now a - b */ + + if (BN_ucmp(a,b) < 0) + { + if (!BN_usub(r,b,a)) return(0); + r->neg=1; + } + else + { + if (!BN_usub(r,a,b)) return(0); + r->neg=0; + } + return(1); + } + + ret = BN_uadd(r,a,b); + r->neg = a_neg; + bn_check_top(r); + return ret; + } + +/* unsigned add of b to a */ +int BN_uadd(BIGNUM *r, const BIGNUM *a, const BIGNUM *b) + { + int max,min,dif; + BN_ULONG *ap,*bp,*rp,carry,t1,t2; + const BIGNUM *tmp; + + bn_check_top(a); + bn_check_top(b); + + if (a->top < b->top) + { tmp=a; a=b; b=tmp; } + max = a->top; + min = b->top; + dif = max - min; + + if (bn_wexpand(r,max+1) == NULL) + return 0; + + r->top=max; + + + ap=a->d; + bp=b->d; + rp=r->d; + + carry=bn_add_words(rp,ap,bp,min); + rp+=min; + ap+=min; + bp+=min; + + if (carry) + { + while (dif) + { + dif--; + t1 = *(ap++); + t2 = (t1+1) & BN_MASK2; + *(rp++) = t2; + if (t2) + { + carry=0; + break; + } + } + if (carry) + { + /* carry != 0 => dif == 0 */ + *rp = 1; + r->top++; + } + } + if (dif && rp != ap) + while (dif--) + /* copy remaining words if ap != rp */ + *(rp++) = *(ap++); + r->neg = 0; + bn_check_top(r); + return 1; + } + +/* unsigned subtraction of b from a, a must be larger than b. */ +int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b) + { + int max,min,dif; + register BN_ULONG t1,t2,*ap,*bp,*rp; + int i,carry; +#if defined(IRIX_CC_BUG) && !defined(LINT) + int dummy; +#endif + + bn_check_top(a); + bn_check_top(b); + + max = a->top; + min = b->top; + dif = max - min; + + if (dif < 0) /* hmm... should not be happening */ + { + BNerr(BN_F_BN_USUB,BN_R_ARG2_LT_ARG3); + return(0); + } + + if (bn_wexpand(r,max) == NULL) return(0); + + ap=a->d; + bp=b->d; + rp=r->d; + +#if 1 + carry=0; + for (i = min; i != 0; i--) + { + t1= *(ap++); + t2= *(bp++); + if (carry) + { + carry=(t1 <= t2); + t1=(t1-t2-1)&BN_MASK2; + } + else + { + carry=(t1 < t2); + t1=(t1-t2)&BN_MASK2; + } +#if defined(IRIX_CC_BUG) && !defined(LINT) + dummy=t1; +#endif + *(rp++)=t1&BN_MASK2; + } +#else + carry=bn_sub_words(rp,ap,bp,min); + ap+=min; + bp+=min; + rp+=min; +#endif + if (carry) /* subtracted */ + { + if (!dif) + /* error: a < b */ + return 0; + while (dif) + { + dif--; + t1 = *(ap++); + t2 = (t1-1)&BN_MASK2; + *(rp++) = t2; + if (t1) + break; + } + } +#if 0 + memcpy(rp,ap,sizeof(*rp)*(max-i)); +#else + if (rp != ap) + { + for (;;) + { + if (!dif--) break; + rp[0]=ap[0]; + if (!dif--) break; + rp[1]=ap[1]; + if (!dif--) break; + rp[2]=ap[2]; + if (!dif--) break; + rp[3]=ap[3]; + rp+=4; + ap+=4; + } + } +#endif + + r->top=max; + r->neg=0; + bn_correct_top(r); + return(1); + } + +int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b) + { + int max; + int add=0,neg=0; + const BIGNUM *tmp; + + bn_check_top(a); + bn_check_top(b); + + /* a - b a-b + * a - -b a+b + * -a - b -(a+b) + * -a - -b b-a + */ + if (a->neg) + { + if (b->neg) + { tmp=a; a=b; b=tmp; } + else + { add=1; neg=1; } + } + else + { + if (b->neg) { add=1; neg=0; } + } + + if (add) + { + if (!BN_uadd(r,a,b)) return(0); + r->neg=neg; + return(1); + } + + /* We are actually doing a - b :-) */ + + max=(a->top > b->top)?a->top:b->top; + if (bn_wexpand(r,max) == NULL) return(0); + if (BN_ucmp(a,b) < 0) + { + if (!BN_usub(r,b,a)) return(0); + r->neg=1; + } + else + { + if (!BN_usub(r,a,b)) return(0); + r->neg=0; + } + bn_check_top(r); + return(1); + } + |