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 p=buf; 123 lp=bn_data; 124 if (t->neg) *(p++)='-'; 125 if (t->top == 0) 126 { 127 *(p++)='0'; 128 *(p++)='\0'; 129 } 130 else 131 { 132 i=0; 133 while (!BN_is_zero(t)) 134 { 135 *lp=BN_div_word(t,BN_DEC_CONV); 136 lp++; 137 } 138 lp--; 139 /* We now have a series of blocks, BN_DEC_NUM chars 140 * in length, where the last one needs truncation. 141 * The blocks need to be reversed in order. */ 142 sprintf(p,BN_DEC_FMT1,*lp); 143 while (*p) p++; 144 while (lp != bn_data) 145 { 146 lp--; 147 sprintf(p,BN_DEC_FMT2,*lp); 148 while (*p) p++; 149 } 150 } 151 err: 152 if (bn_data != NULL) OPENSSL_free(bn_data); 153 if (t != NULL) BN_free(t); 154 return(buf); 155 } 156 157 int BN_hex2bn(BIGNUM **bn, const char *a) 158 { 159 BIGNUM *ret=NULL; 160 BN_ULONG l=0; 161 int neg=0,h,m,i,j,k,c; 162 int num; 163 164 if ((a == NULL) || (*a == '\0')) return(0); 165 166 if (*a == '-') { neg=1; a++; } 167 168 for (i=0; isxdigit((unsigned char) a[i]); i++) 169 ; 170 171 num=i+neg; 172 if (bn == NULL) return(num); 173 174 /* a is the start of the hex digits, and it is 'i' long */ 175 if (*bn == NULL) 176 { 177 if ((ret=BN_new()) == NULL) return(0); 178 } 179 else 180 { 181 ret= *bn; 182 BN_zero(ret); 183 } 184 185 /* i is the number of hex digests; */ 186 if (bn_expand(ret,i*4) == NULL) goto err; 187 188 j=i; /* least significant 'hex' */ 189 m=0; 190 h=0; 191 while (j > 0) 192 { 193 m=((BN_BYTES*2) <= j)?(BN_BYTES*2):j; 194 l=0; 195 for (;;) 196 { 197 c=a[j-m]; 198 if ((c >= '0') && (c <= '9')) k=c-'0'; 199 else if ((c >= 'a') && (c <= 'f')) k=c-'a'+10; 200 else if ((c >= 'A') && (c <= 'F')) k=c-'A'+10; 201 else k=0; /* paranoia */ 202 l=(l<<4)|k; 203 204 if (--m <= 0) 205 { 206 ret->d[h++]=l; 207 break; 208 } 209 } 210 j-=(BN_BYTES*2); 211 } 212 ret->top=h; 213 bn_fix_top(ret); 214 ret->neg=neg; 215 216 *bn=ret; 217 return(num); 218 err: 219 if (*bn == NULL) BN_free(ret); 220 return(0); 221 } 222 223 int BN_dec2bn(BIGNUM **bn, const char *a) 224 { 225 BIGNUM *ret=NULL; 226 BN_ULONG l=0; 227 int neg=0,i,j; 228 int num; 229 230 if ((a == NULL) || (*a == '\0')) return(0); 231 if (*a == '-') { neg=1; a++; } 232 233 for (i=0; isdigit((unsigned char) a[i]); i++) 234 ; 235 236 num=i+neg; 237 if (bn == NULL) return(num); 238 239 /* a is the start of the digits, and it is 'i' long. 240 * We chop it into BN_DEC_NUM digits at a time */ 241 if (*bn == NULL) 242 { 243 if ((ret=BN_new()) == NULL) return(0); 244 } 245 else 246 { 247 ret= *bn; 248 BN_zero(ret); 249 } 250 251 /* i is the number of digests, a bit of an over expand; */ 252 if (bn_expand(ret,i*4) == NULL) goto err; 253 254 j=BN_DEC_NUM-(i%BN_DEC_NUM); 255 if (j == BN_DEC_NUM) j=0; 256 l=0; 257 while (*a) 258 { 259 l*=10; 260 l+= *a-'0'; 261 a++; 262 if (++j == BN_DEC_NUM) 263 { 264 BN_mul_word(ret,BN_DEC_CONV); 265 BN_add_word(ret,l); 266 l=0; 267 j=0; 268 } 269 } 270 ret->neg=neg; 271 272 bn_fix_top(ret); 273 *bn=ret; 274 return(num); 275 err: 276 if (*bn == NULL) BN_free(ret); 277 return(0); 278 } 279 280 #ifndef NO_BIO 281 #ifndef NO_FP_API 282 int BN_print_fp(FILE *fp, const BIGNUM *a) 283 { 284 BIO *b; 285 int ret; 286 287 if ((b=BIO_new(BIO_s_file())) == NULL) 288 return(0); 289 BIO_set_fp(b,fp,BIO_NOCLOSE); 290 ret=BN_print(b,a); 291 BIO_free(b); 292 return(ret); 293 } 294 #endif 295 296 int BN_print(BIO *bp, const BIGNUM *a) 297 { 298 int i,j,v,z=0; 299 int ret=0; 300 301 if ((a->neg) && (BIO_write(bp,"-",1) != 1)) goto end; 302 if ((a->top == 0) && (BIO_write(bp,"0",1) != 1)) goto end; 303 for (i=a->top-1; i >=0; i--) 304 { 305 for (j=BN_BITS2-4; j >= 0; j-=4) 306 { 307 /* strip leading zeros */ 308 v=((int)(a->d[i]>>(long)j))&0x0f; 309 if (z || (v != 0)) 310 { 311 if (BIO_write(bp,&(Hex[v]),1) != 1) 312 goto end; 313 z=1; 314 } 315 } 316 } 317 ret=1; 318 end: 319 return(ret); 320 } 321 #endif 322 323 #ifdef BN_DEBUG 324 void bn_dump1(FILE *o, const char *a, BN_ULONG *b,int n) 325 { 326 int i; 327 fprintf(o, "%s=", a); 328 for (i=n-1;i>=0;i--) 329 fprintf(o, "%08lX", b[i]); /* assumes 32-bit BN_ULONG */ 330 fprintf(o, "\n"); 331 } 332 #endif 333