1 /* crypto/bn/bn_print.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.]
62 #include <openssl/buffer.h>
65 static const char Hex[]="0123456789ABCDEF";
67 /* Must 'OPENSSL_free' the returned data */
68 char *BN_bn2hex(const BIGNUM *a)
74 buf=(char *)OPENSSL_malloc(a->top*BN_BYTES*2+2);
77 BNerr(BN_F_BN_BN2HEX,ERR_R_MALLOC_FAILURE);
81 if (a->neg) *(p++)='-';
82 if (BN_is_zero(a)) *(p++)='0';
83 for (i=a->top-1; i >=0; i--)
85 for (j=BN_BITS2-8; j >= 0; j-=8)
87 /* strip leading zeros */
88 v=((int)(a->d[i]>>(long)j))&0xff;
102 /* Must 'OPENSSL_free' the returned data */
103 char *BN_bn2dec(const BIGNUM *a)
109 BN_ULONG *bn_data=NULL,*lp;
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
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))
122 BNerr(BN_F_BN_BN2DEC,ERR_R_MALLOC_FAILURE);
125 if ((t=BN_dup(a)) == NULL) goto err;
127 #define BUF_REMAIN (num+3 - (size_t)(p - buf))
137 if (BN_is_negative(t))
141 while (!BN_is_zero(t))
143 *lp=BN_div_word(t,BN_DEC_CONV);
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);
152 while (lp != bn_data)
155 BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT2,*lp);
161 if (bn_data != NULL) OPENSSL_free(bn_data);
162 if (t != NULL) BN_free(t);
172 int BN_hex2bn(BIGNUM **bn, const char *a)
176 int neg=0,h,m,i,j,k,c;
179 if ((a == NULL) || (*a == '\0')) return(0);
181 if (*a == '-') { neg=1; a++; }
183 for (i=0; isxdigit((unsigned char) a[i]); i++)
187 if (bn == NULL) return(num);
189 /* a is the start of the hex digits, and it is 'i' long */
192 if ((ret=BN_new()) == NULL) return(0);
200 /* i is the number of hex digests; */
201 if (bn_expand(ret,i*4) == NULL) goto err;
203 j=i; /* least significant 'hex' */
208 m=((BN_BYTES*2) <= j)?(BN_BYTES*2):j;
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 */
235 if (*bn == NULL) BN_free(ret);
239 int BN_dec2bn(BIGNUM **bn, const char *a)
246 if ((a == NULL) || (*a == '\0')) return(0);
247 if (*a == '-') { neg=1; a++; }
249 for (i=0; isdigit((unsigned char) a[i]); i++)
253 if (bn == NULL) return(num);
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 */
259 if ((ret=BN_new()) == NULL) return(0);
267 /* i is the number of digests, a bit of an over expand; */
268 if (bn_expand(ret,i*4) == NULL) goto err;
270 j=BN_DEC_NUM-(i%BN_DEC_NUM);
271 if (j == BN_DEC_NUM) j=0;
278 if (++j == BN_DEC_NUM)
280 BN_mul_word(ret,BN_DEC_CONV);
293 if (*bn == NULL) BN_free(ret);
297 int BN_asc2bn(BIGNUM **bn, const char *a)
303 if (p[0] == '0' && (p[1] == 'X' || p[1] == 'x'))
305 if (!BN_hex2bn(bn, p + 2))
310 if (!BN_dec2bn(bn, p))
318 #ifndef OPENSSL_NO_BIO
319 #ifndef OPENSSL_NO_FP_API
320 int BN_print_fp(FILE *fp, const BIGNUM *a)
325 if ((b=BIO_new(BIO_s_file())) == NULL)
327 BIO_set_fp(b,fp,BIO_NOCLOSE);
334 int BN_print(BIO *bp, const BIGNUM *a)
339 if ((a->neg) && (BIO_write(bp,"-",1) != 1)) goto end;
340 if (BN_is_zero(a) && (BIO_write(bp,"0",1) != 1)) goto end;
341 for (i=a->top-1; i >=0; i--)
343 for (j=BN_BITS2-4; j >= 0; j-=4)
345 /* strip leading zeros */
346 v=((int)(a->d[i]>>(long)j))&0x0f;
349 if (BIO_write(bp,&(Hex[v]),1) != 1)
361 char *BN_options(void)
364 static char data[16];
370 BIO_snprintf(data,sizeof data,"bn(%d,%d)",
371 (int)sizeof(BN_ULLONG)*8,(int)sizeof(BN_ULONG)*8);
373 BIO_snprintf(data,sizeof data,"bn(%d,%d)",
374 (int)sizeof(BN_ULONG)*8,(int)sizeof(BN_ULONG)*8);