1 /* crypto/bn/bn_print.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (BN_is_zero(a)) *(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, ok = 0; 106 char *buf=NULL; 107 char *p; 108 BIGNUM *t=NULL; 109 BN_ULONG *bn_data=NULL,*lp; 110 111 /* get an upper bound for the length of the decimal integer 112 * num <= (BN_num_bits(a) + 1) * log(2) 113 * <= 3 * BN_num_bits(a) * 0.1001 + log(2) + 1 (rounding error) 114 * <= BN_num_bits(a)/10 + BN_num_bits/1000 + 1 + 1 115 */ 116 i=BN_num_bits(a)*3; 117 num=(i/10+i/1000+1)+1; 118 bn_data=(BN_ULONG *)OPENSSL_malloc((num/BN_DEC_NUM+1)*sizeof(BN_ULONG)); 119 buf=(char *)OPENSSL_malloc(num+3); 120 if ((buf == NULL) || (bn_data == NULL)) 121 { 122 BNerr(BN_F_BN_BN2DEC,ERR_R_MALLOC_FAILURE); 123 goto err; 124 } 125 if ((t=BN_dup(a)) == NULL) goto err; 126 127 #define BUF_REMAIN (num+3 - (size_t)(p - buf)) 128 p=buf; 129 lp=bn_data; 130 if (BN_is_zero(t)) 131 { 132 *(p++)='0'; 133 *(p++)='\0'; 134 } 135 else 136 { 137 if (BN_is_negative(t)) 138 *p++ = '-'; 139 140 i=0; 141 while (!BN_is_zero(t)) 142 { 143 *lp=BN_div_word(t,BN_DEC_CONV); 144 lp++; 145 } 146 lp--; 147 /* We now have a series of blocks, BN_DEC_NUM chars 148 * in length, where the last one needs truncation. 149 * The blocks need to be reversed in order. */ 150 BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT1,*lp); 151 while (*p) p++; 152 while (lp != bn_data) 153 { 154 lp--; 155 BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT2,*lp); 156 while (*p) p++; 157 } 158 } 159 ok = 1; 160 err: 161 if (bn_data != NULL) OPENSSL_free(bn_data); 162 if (t != NULL) BN_free(t); 163 if (!ok && buf) 164 { 165 OPENSSL_free(buf); 166 buf = NULL; 167 } 168 169 return(buf); 170 } 171 172 int BN_hex2bn(BIGNUM **bn, const char *a) 173 { 174 BIGNUM *ret=NULL; 175 BN_ULONG l=0; 176 int neg=0,h,m,i,j,k,c; 177 int num; 178 179 if ((a == NULL) || (*a == '\0')) return(0); 180 181 if (*a == '-') { neg=1; a++; } 182 183 for (i=0; isxdigit((unsigned char) a[i]); i++) 184 ; 185 186 num=i+neg; 187 if (bn == NULL) return(num); 188 189 /* a is the start of the hex digits, and it is 'i' long */ 190 if (*bn == NULL) 191 { 192 if ((ret=BN_new()) == NULL) return(0); 193 } 194 else 195 { 196 ret= *bn; 197 BN_zero(ret); 198 } 199 200 /* i is the number of hex digests; */ 201 if (bn_expand(ret,i*4) == NULL) goto err; 202 203 j=i; /* least significant 'hex' */ 204 m=0; 205 h=0; 206 while (j > 0) 207 { 208 m=((BN_BYTES*2) <= j)?(BN_BYTES*2):j; 209 l=0; 210 for (;;) 211 { 212 c=a[j-m]; 213 if ((c >= '0') && (c <= '9')) k=c-'0'; 214 else if ((c >= 'a') && (c <= 'f')) k=c-'a'+10; 215 else if ((c >= 'A') && (c <= 'F')) k=c-'A'+10; 216 else k=0; /* paranoia */ 217 l=(l<<4)|k; 218 219 if (--m <= 0) 220 { 221 ret->d[h++]=l; 222 break; 223 } 224 } 225 j-=(BN_BYTES*2); 226 } 227 ret->top=h; 228 bn_correct_top(ret); 229 ret->neg=neg; 230 231 *bn=ret; 232 bn_check_top(ret); 233 return(num); 234 err: 235 if (*bn == NULL) BN_free(ret); 236 return(0); 237 } 238 239 int BN_dec2bn(BIGNUM **bn, const char *a) 240 { 241 BIGNUM *ret=NULL; 242 BN_ULONG l=0; 243 int neg=0,i,j; 244 int num; 245 246 if ((a == NULL) || (*a == '\0')) return(0); 247 if (*a == '-') { neg=1; a++; } 248 249 for (i=0; isdigit((unsigned char) a[i]); i++) 250 ; 251 252 num=i+neg; 253 if (bn == NULL) return(num); 254 255 /* a is the start of the digits, and it is 'i' long. 256 * We chop it into BN_DEC_NUM digits at a time */ 257 if (*bn == NULL) 258 { 259 if ((ret=BN_new()) == NULL) return(0); 260 } 261 else 262 { 263 ret= *bn; 264 BN_zero(ret); 265 } 266 267 /* i is the number of digests, a bit of an over expand; */ 268 if (bn_expand(ret,i*4) == NULL) goto err; 269 270 j=BN_DEC_NUM-(i%BN_DEC_NUM); 271 if (j == BN_DEC_NUM) j=0; 272 l=0; 273 while (*a) 274 { 275 l*=10; 276 l+= *a-'0'; 277 a++; 278 if (++j == BN_DEC_NUM) 279 { 280 BN_mul_word(ret,BN_DEC_CONV); 281 BN_add_word(ret,l); 282 l=0; 283 j=0; 284 } 285 } 286 ret->neg=neg; 287 288 bn_correct_top(ret); 289 *bn=ret; 290 bn_check_top(ret); 291 return(num); 292 err: 293 if (*bn == NULL) BN_free(ret); 294 return(0); 295 } 296 297 #ifndef OPENSSL_NO_BIO 298 #ifndef OPENSSL_NO_FP_API 299 int BN_print_fp(FILE *fp, const BIGNUM *a) 300 { 301 BIO *b; 302 int ret; 303 304 if ((b=BIO_new(BIO_s_file())) == NULL) 305 return(0); 306 BIO_set_fp(b,fp,BIO_NOCLOSE); 307 ret=BN_print(b,a); 308 BIO_free(b); 309 return(ret); 310 } 311 #endif 312 313 int BN_print(BIO *bp, const BIGNUM *a) 314 { 315 int i,j,v,z=0; 316 int ret=0; 317 318 if ((a->neg) && (BIO_write(bp,"-",1) != 1)) goto end; 319 if (BN_is_zero(a) && (BIO_write(bp,"0",1) != 1)) goto end; 320 for (i=a->top-1; i >=0; i--) 321 { 322 for (j=BN_BITS2-4; j >= 0; j-=4) 323 { 324 /* strip leading zeros */ 325 v=((int)(a->d[i]>>(long)j))&0x0f; 326 if (z || (v != 0)) 327 { 328 if (BIO_write(bp,&(Hex[v]),1) != 1) 329 goto end; 330 z=1; 331 } 332 } 333 } 334 ret=1; 335 end: 336 return(ret); 337 } 338 #endif 339
