crypto/openssl-0.9.7d/crypto/bn/bn_print.c

   1 /* crypto/bn/bn_print.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 <ctype.h>
  61 #include "cryptlib.h"
  62 #include <openssl/buffer.h>
  63 #include "bn_lcl.h"
  64
  65 static const char *Hex="0123456789ABCDEF";
  66
  67 /* Must 'OPENSSL_free' the returned data */
  68 char *BN_bn2hex(const BIGNUM *a)
  69         {
  70         int i,j,v,z=0;
  71         char *buf;
  72         char *p;
  73
  74         buf=(char *)OPENSSL_malloc(a->top*BN_BYTES*2+2);
  75         if (buf == NULL)
  76                 {
  77                 BNerr(BN_F_BN_BN2HEX,ERR_R_MALLOC_FAILURE);
  78                 goto err;
  79                 }
  80         p=buf;
  81         if (a->neg) *(p++)='-';
  82         if (a->top == 0) *(p++)='0';
  83         for (i=a->top-1; i >=0; i--)
  84                 {
  85                 for (j=BN_BITS2-8; j >= 0; j-=8)
  86                         {
  87                         /* strip leading zeros */
  88                         v=((int)(a->d[i]>>(long)j))&0xff;
  89                         if (z || (v != 0))
  90                                 {
  91                                 *(p++)=Hex[v>>4];
  92                                 *(p++)=Hex[v&0x0f];
  93                                 z=1;
  94                                 }
  95                         }
  96                 }
  97         *p='\0';
  98 err:
  99         return(buf);
 100         }
 101
 102 /* Must 'OPENSSL_free' the returned data */
 103 char *BN_bn2dec(const BIGNUM *a)
 104         {
 105         int i=0,num;
 106         char *buf=NULL;
 107         char *p;
 108         BIGNUM *t=NULL;
 109         BN_ULONG *bn_data=NULL,*lp;
 110
 111         i=BN_num_bits(a)*3;
 112         num=(i/10+i/1000+3)+1;
 113         bn_data=(BN_ULONG *)OPENSSL_malloc((num/BN_DEC_NUM+1)*sizeof(BN_ULONG));
 114         buf=(char *)OPENSSL_malloc(num+3);
 115         if ((buf == NULL) || (bn_data == NULL))
 116                 {
 117                 BNerr(BN_F_BN_BN2DEC,ERR_R_MALLOC_FAILURE);
 118                 goto err;
 119                 }
 120         if ((t=BN_dup(a)) == NULL) goto err;
 121
 122 #define BUF_REMAIN (num+3 - (size_t)(p - buf))
 123         p=buf;
 124         lp=bn_data;
 125         if (t->neg) *(p++)='-';
 126         if (t->top == 0)
 127                 {
 128                 *(p++)='0';
 129                 *(p++)='\0';
 130                 }
 131         else
 132                 {
 133                 i=0;
 134                 while (!BN_is_zero(t))
 135                         {
 136                         *lp=BN_div_word(t,BN_DEC_CONV);
 137                         lp++;
 138                         }
 139                 lp--;
 140                 /* We now have a series of blocks, BN_DEC_NUM chars
 141                  * in length, where the last one needs truncation.
 142                  * The blocks need to be reversed in order. */
 143                 BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT1,*lp);
 144                 while (*p) p++;
 145                 while (lp != bn_data)
 146                         {
 147                         lp--;
 148                         BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT2,*lp);
 149                         while (*p) p++;
 150                         }
 151                 }
 152 err:
 153         if (bn_data != NULL) OPENSSL_free(bn_data);
 154         if (t != NULL) BN_free(t);
 155         return(buf);
 156         }
 157
 158 int BN_hex2bn(BIGNUM **bn, const char *a)
 159         {
 160         BIGNUM *ret=NULL;
 161         BN_ULONG l=0;
 162         int neg=0,h,m,i,j,k,c;
 163         int num;
 164
 165         if ((a == NULL) || (*a == '\0')) return(0);
 166
 167         if (*a == '-') { neg=1; a++; }
 168
 169         for (i=0; isxdigit((unsigned char) a[i]); i++)
 170                 ;
 171
 172         num=i+neg;
 173         if (bn == NULL) return(num);
 174
 175         /* a is the start of the hex digits, and it is 'i' long */
 176         if (*bn == NULL)
 177                 {
 178                 if ((ret=BN_new()) == NULL) return(0);
 179                 }
 180         else
 181                 {
 182                 ret= *bn;
 183                 BN_zero(ret);
 184                 }
 185
 186         /* i is the number of hex digests; */
 187         if (bn_expand(ret,i*4) == NULL) goto err;
 188
 189         j=i; /* least significant 'hex' */
 190         m=0;
 191         h=0;
 192         while (j > 0)
 193                 {
 194                 m=((BN_BYTES*2) <= j)?(BN_BYTES*2):j;
 195                 l=0;
 196                 for (;;)
 197                         {
 198                         c=a[j-m];
 199                         if ((c >= '0') && (c <= '9')) k=c-'0';
 200                         else if ((c >= 'a') && (c <= 'f')) k=c-'a'+10;
 201                         else if ((c >= 'A') && (c <= 'F')) k=c-'A'+10;
 202                         else k=0; /* paranoia */
 203                         l=(l<<4)|k;
 204
 205                         if (--m <= 0)
 206                                 {
 207                                 ret->d[h++]=l;
 208                                 break;
 209                                 }
 210                         }
 211                 j-=(BN_BYTES*2);
 212                 }
 213         ret->top=h;
 214         bn_fix_top(ret);
 215         ret->neg=neg;
 216
 217         *bn=ret;
 218         return(num);
 219 err:
 220         if (*bn == NULL) BN_free(ret);
 221         return(0);
 222         }
 223
 224 int BN_dec2bn(BIGNUM **bn, const char *a)
 225         {
 226         BIGNUM *ret=NULL;
 227         BN_ULONG l=0;
 228         int neg=0,i,j;
 229         int num;
 230
 231         if ((a == NULL) || (*a == '\0')) return(0);
 232         if (*a == '-') { neg=1; a++; }
 233
 234         for (i=0; isdigit((unsigned char) a[i]); i++)
 235                 ;
 236
 237         num=i+neg;
 238         if (bn == NULL) return(num);
 239
 240         /* a is the start of the digits, and it is 'i' long.
 241          * We chop it into BN_DEC_NUM digits at a time */
 242         if (*bn == NULL)
 243                 {
 244                 if ((ret=BN_new()) == NULL) return(0);
 245                 }
 246         else
 247                 {
 248                 ret= *bn;
 249                 BN_zero(ret);
 250                 }
 251
 252         /* i is the number of digests, a bit of an over expand; */
 253         if (bn_expand(ret,i*4) == NULL) goto err;
 254
 255         j=BN_DEC_NUM-(i%BN_DEC_NUM);
 256         if (j == BN_DEC_NUM) j=0;
 257         l=0;
 258         while (*a)
 259                 {
 260                 l*=10;
 261                 l+= *a-'0';
 262                 a++;
 263                 if (++j == BN_DEC_NUM)
 264                         {
 265                         BN_mul_word(ret,BN_DEC_CONV);
 266                         BN_add_word(ret,l);
 267                         l=0;
 268                         j=0;
 269                         }
 270                 }
 271         ret->neg=neg;
 272
 273         bn_fix_top(ret);
 274         *bn=ret;
 275         return(num);
 276 err:
 277         if (*bn == NULL) BN_free(ret);
 278         return(0);
 279         }
 280
 281 #ifndef OPENSSL_NO_BIO
 282 #ifndef OPENSSL_NO_FP_API
 283 int BN_print_fp(FILE *fp, const BIGNUM *a)
 284         {
 285         BIO *b;
 286         int ret;
 287
 288         if ((b=BIO_new(BIO_s_file())) == NULL)
 289                 return(0);
 290         BIO_set_fp(b,fp,BIO_NOCLOSE);
 291         ret=BN_print(b,a);
 292         BIO_free(b);
 293         return(ret);
 294         }
 295 #endif
 296
 297 int BN_print(BIO *bp, const BIGNUM *a)
 298         {
 299         int i,j,v,z=0;
 300         int ret=0;
 301
 302         if ((a->neg) && (BIO_write(bp,"-",1) != 1)) goto end;
 303         if ((a->top == 0) && (BIO_write(bp,"0",1) != 1)) goto end;
 304         for (i=a->top-1; i >=0; i--)
 305                 {
 306                 for (j=BN_BITS2-4; j >= 0; j-=4)
 307                         {
 308                         /* strip leading zeros */
 309                         v=((int)(a->d[i]>>(long)j))&0x0f;
 310                         if (z || (v != 0))
 311                                 {
 312                                 if (BIO_write(bp,&(Hex[v]),1) != 1)
 313                                         goto end;
 314                                 z=1;
 315                                 }
 316                         }
 317                 }
 318         ret=1;
 319 end:
 320         return(ret);
 321         }
 322 #endif
 323
 324 #ifdef BN_DEBUG
 325 void bn_dump1(FILE *o, const char *a, const BN_ULONG *b,int n)
 326         {
 327         int i;
 328         fprintf(o, "%s=", a);
 329         for (i=n-1;i>=0;i--)
 330                 fprintf(o, "%08lX", b[i]); /* assumes 32-bit BN_ULONG */
 331         fprintf(o, "\n");
 332         }
 333 #endif