1 /* crypto/bn/bn_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
63 const char *BN_version="Big Number" OPENSSL_VERSION_PTEXT;
65 /* For a 32 bit machine
75 int bn_limit_num=8; /* (1<<bn_limit_bits) */
76 int bn_limit_bits_low=0;
77 int bn_limit_num_low=8; /* (1<<bn_limit_bits_low) */
78 int bn_limit_bits_high=0;
79 int bn_limit_num_high=8; /* (1<<bn_limit_bits_high) */
80 int bn_limit_bits_mont=0;
81 int bn_limit_num_mont=8; /* (1<<bn_limit_bits_mont) */
83 void BN_set_params(mult,high,low,mont)
84 int mult,high,low,mont;
88 if (mult > (sizeof(int)*8)-1)
95 if (high > (sizeof(int)*8)-1)
97 bn_limit_bits_high=high;
98 bn_limit_num_high=1<<high;
102 if (low > (sizeof(int)*8)-1)
104 bn_limit_bits_low=low;
105 bn_limit_num_low=1<<low;
109 if (mont > (sizeof(int)*8)-1)
110 mont=sizeof(int)*8-1;
111 bn_limit_bits_mont=mont;
112 bn_limit_num_mont=1<<mont;
116 int BN_get_params(which)
119 if (which == 0) return(bn_limit_bits);
120 else if (which == 1) return(bn_limit_bits_high);
121 else if (which == 2) return(bn_limit_bits_low);
122 else if (which == 3) return(bn_limit_bits_mont);
126 BIGNUM *BN_value_one()
128 static BN_ULONG data_one=1L;
129 static BIGNUM const_one={&data_one,1,1,0};
137 static char data[16];
143 sprintf(data,"bn(%d,%d)",(int)sizeof(BN_ULLONG)*8,
144 (int)sizeof(BN_ULONG)*8);
146 sprintf(data,"bn(%d,%d)",(int)sizeof(BN_ULONG)*8,
147 (int)sizeof(BN_ULONG)*8);
153 int BN_num_bits_word(l)
156 static char bits[256]={
157 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,
158 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
159 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
160 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
161 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
162 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
163 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
164 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
165 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
166 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
167 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
168 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
169 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
170 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
171 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
172 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
175 #if defined(SIXTY_FOUR_BIT_LONG)
176 if (l & 0xffffffff00000000L)
178 if (l & 0xffff000000000000L)
180 if (l & 0xff00000000000000L)
182 return(bits[(int)(l>>56)]+56);
184 else return(bits[(int)(l>>48)]+48);
188 if (l & 0x0000ff0000000000L)
190 return(bits[(int)(l>>40)]+40);
192 else return(bits[(int)(l>>32)]+32);
197 #ifdef SIXTY_FOUR_BIT
198 if (l & 0xffffffff00000000LL)
200 if (l & 0xffff000000000000LL)
202 if (l & 0xff00000000000000LL)
204 return(bits[(int)(l>>56)]+56);
206 else return(bits[(int)(l>>48)]+48);
210 if (l & 0x0000ff0000000000LL)
212 return(bits[(int)(l>>40)]+40);
214 else return(bits[(int)(l>>32)]+32);
221 #if defined(THIRTY_TWO_BIT) || defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG)
225 return(bits[(int)(l>>24L)]+24);
226 else return(bits[(int)(l>>16L)]+16);
231 #if defined(SIXTEEN_BIT) || defined(THIRTY_TWO_BIT) || defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG)
233 return(bits[(int)(l>>8)]+8);
236 return(bits[(int)(l )] );
249 if (a->top == 0) return(0);
251 i=(a->top-1)*BN_BITS2;
254 #if !defined(NO_STDIO) && !defined(WIN16)
255 fprintf(stderr,"BAD TOP VALUE\n");
259 return(i+BN_num_bits_word(l));
262 void BN_clear_free(a)
267 if (a == NULL) return;
270 memset(a->d,0,a->max*sizeof(a->d[0]));
271 if (!(BN_get_flags(a,BN_FLG_STATIC_DATA)))
274 i=BN_get_flags(a,BN_FLG_MALLOCED);
275 memset(a,0,sizeof(BIGNUM));
283 if (a == NULL) return;
284 if ((a->d != NULL) && !(BN_get_flags(a,BN_FLG_STATIC_DATA)))
286 a->flags|=BN_FLG_FREE; /* REMOVE? */
287 if (a->flags & BN_FLG_MALLOCED)
294 memset(a,0,sizeof(BIGNUM));
301 if ((ret=(BIGNUM *)Malloc(sizeof(BIGNUM))) == NULL)
303 BNerr(BN_F_BN_NEW,ERR_R_MALLOC_FAILURE);
306 ret->flags=BN_FLG_MALLOCED;
319 ret=(BN_CTX *)Malloc(sizeof(BN_CTX));
322 BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);
327 ret->flags=BN_FLG_MALLOCED;
331 void BN_CTX_init(ctx)
334 memset(ctx,0,sizeof(BN_CTX));
347 for (i=0; i<BN_CTX_NUM; i++)
348 BN_clear_free(&(c->bn[i]));
349 if (c->flags & BN_FLG_MALLOCED)
353 BIGNUM *bn_expand2(b, words)
365 if (BN_get_flags(b,BN_FLG_STATIC_DATA))
367 BNerr(BN_F_BN_EXPAND2,BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);
370 a=A=(BN_ULONG *)Malloc(sizeof(BN_ULONG)*(words+1));
373 BNerr(BN_F_BN_EXPAND2,ERR_R_MALLOC_FAILURE);
376 memset(A,0x5c,sizeof(BN_ULONG)*(words+1));
379 /* Check if the previous number needs to be copied */
382 /* This lot is an unrolled loop to copy b->top
383 * BN_ULONGs from B to A
385 for (i=b->top&(~7); i>0; i-=8)
387 A[0]=B[0]; A[1]=B[1]; A[2]=B[2]; A[3]=B[3];
388 A[4]=B[4]; A[5]=B[5]; A[6]=B[6]; A[7]=B[7];
409 /* I need the 'case 0' entry for utrix cc.
410 * If the optimiser is turned on, it does the
411 * switch table by doing
414 * goto jump_table[a];
415 * If top is 0, this makes us jump to 0xffffffc
416 * which is rather bad :-(.
427 /* Now need to zero any data between b->top and b->max */
430 j=(b->max - b->top) & ~7;
433 B[0]=0; B[1]=0; B[2]=0; B[3]=0;
434 B[4]=0; B[5]=0; B[6]=0; B[7]=0;
437 j=(b->max - b->top) & 7;
444 memcpy(a->d,b->d,sizeof(b->d[0])*b->top);
447 /* memset(&(p[b->max]),0,((words+1)-b->max)*sizeof(BN_ULONG)); */
448 /* { int i; for (i=b->max; i<words+1; i++) p[i]=i;} */
462 if (r == NULL) return(NULL);
463 return((BIGNUM *)BN_copy(r,a));
466 BIGNUM *BN_copy(a, b)
475 if (a == b) return(a);
476 if (bn_wexpand(a,b->top) == NULL) return(NULL);
481 for (i=b->top&(~7); i>0; i-=8)
511 /* I need the 'case 0' entry for utrix cc.
512 * If the optimiser is turned on, it does the
513 * switch table by doing
516 * goto jump_table[a];
517 * If top is 0, this makes us jump to 0xffffffc which is
524 memcpy(a->d,b->d,sizeof(b->d[0])*b->top);
527 /* memset(&(a->d[b->top]),0,sizeof(a->d[0])*(a->max-b->top));*/
529 if ((a->top == 0) && (a->d != NULL))
539 memset(a->d,0,a->max*sizeof(a->d[0]));
544 BN_ULONG BN_get_word(a)
551 if (n > sizeof(BN_ULONG))
553 for (i=a->top-1; i>=0; i--)
555 #ifndef SIXTY_FOUR_BIT /* the data item > unsigned long */
556 ret<<=BN_BITS4; /* stops the compiler complaining */
569 if (bn_expand(a,sizeof(BN_ULONG)*8) == NULL) return(0);
571 n=sizeof(BN_ULONG)/BN_BYTES;
574 a->d[0]=(BN_ULONG)w&BN_MASK2;
575 if (a->d[0] != 0) a->top=1;
578 /* the following is done instead of
579 * w>>=BN_BITS2 so compilers don't complain
580 * on builds where sizeof(long) == BN_TYPES */
581 #ifndef SIXTY_FOUR_BIT /* the data item > unsigned long */
585 a->d[i]=(BN_ULONG)w&BN_MASK2;
586 if (a->d[i] != 0) a->top=i+1;
591 /* ignore negative */
592 BIGNUM *BN_bin2bn(s, len, ret)
601 if (ret == NULL) ret=BN_new();
602 if (ret == NULL) return(NULL);
610 if (bn_expand(ret,(int)(n+2)*8) == NULL)
612 i=((n-1)/BN_BYTES)+1;
613 m=((n-1)%(BN_BYTES));
625 /* need to call this due to clear byte at top if avoiding
626 * having the top bit set (-ve number) */
631 /* ignore negative */
643 *(to++)=(unsigned char)(l>>(8*(i%BN_BYTES)))&0xff;
653 BN_ULONG t1,t2,*ap,*bp;
659 if (i != 0) return(i);
662 for (i=a->top-1; i>=0; i--)
667 return(t1 > t2?1:-1);
680 if ((a == NULL) || (b == NULL))
693 if (a->neg != b->neg)
701 else { gt= -1; lt=1; }
703 if (a->top > b->top) return(gt);
704 if (a->top < b->top) return(lt);
705 for (i=a->top-1; i>=0; i--)
709 if (t1 > t2) return(gt);
710 if (t1 < t2) return(lt);
725 if (bn_wexpand(a,i+1) == NULL) return(0);
726 for(k=a->top; k<i+1; k++)
735 int BN_clear_bit(a, n)
743 if (a->top <= i) return(0);
750 int BN_is_bit_set(a, n)
756 if (n < 0) return(0);
759 if (a->top <= i) return(0);
760 return((a->d[i]&(((BN_ULONG)1)<<j))?1:0);
763 int BN_mask_bits(a,n)
771 if (w >= a->top) return(0);
777 a->d[w]&= ~(BN_MASK2<<b);
783 int bn_cmp_words(a,b,n)
792 if (aa != bb) return((aa > bb)?1:-1);
793 for (i=n-2; i>=0; i--)
797 if (aa != bb) return((aa > bb)?1:-1);