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.]
63 #include <openssl/buffer.h>
66 static const char Hex[] = "0123456789ABCDEF";
68 /* Must 'OPENSSL_free' the returned data */
69 char *BN_bn2hex(const BIGNUM *a)
75 if (a->neg && BN_is_zero(a)) {
76 /* "-0" == 3 bytes including NULL terminator */
77 buf = OPENSSL_malloc(3);
79 buf = OPENSSL_malloc(a->top * BN_BYTES * 2 + 2);
82 BNerr(BN_F_BN_BN2HEX, ERR_R_MALLOC_FAILURE);
90 for (i = a->top - 1; i >= 0; i--) {
91 for (j = BN_BITS2 - 8; j >= 0; j -= 8) {
92 /* strip leading zeros */
93 v = ((int)(a->d[i] >> (long)j)) & 0xff;
96 *(p++) = Hex[v & 0x0f];
106 /* Must 'OPENSSL_free' the returned data */
107 char *BN_bn2dec(const BIGNUM *a)
109 int i = 0, num, ok = 0;
113 BN_ULONG *bn_data = NULL, *lp;
116 * get an upper bound for the length of the decimal integer
117 * num <= (BN_num_bits(a) + 1) * log(2)
118 * <= 3 * BN_num_bits(a) * 0.1001 + log(2) + 1 (rounding error)
119 * <= BN_num_bits(a)/10 + BN_num_bits/1000 + 1 + 1
121 i = BN_num_bits(a) * 3;
122 num = (i / 10 + i / 1000 + 1) + 1;
124 (BN_ULONG *)OPENSSL_malloc((num / BN_DEC_NUM + 1) * sizeof(BN_ULONG));
125 buf = (char *)OPENSSL_malloc(num + 3);
126 if ((buf == NULL) || (bn_data == NULL)) {
127 BNerr(BN_F_BN_BN2DEC, ERR_R_MALLOC_FAILURE);
130 if ((t = BN_dup(a)) == NULL)
133 #define BUF_REMAIN (num+3 - (size_t)(p - buf))
140 if (BN_is_negative(t))
144 while (!BN_is_zero(t)) {
145 *lp = BN_div_word(t, BN_DEC_CONV);
150 * We now have a series of blocks, BN_DEC_NUM chars in length, where
151 * the last one needs truncation. The blocks need to be reversed in
154 BIO_snprintf(p, BUF_REMAIN, BN_DEC_FMT1, *lp);
157 while (lp != bn_data) {
159 BIO_snprintf(p, BUF_REMAIN, BN_DEC_FMT2, *lp);
167 OPENSSL_free(bn_data);
178 int BN_hex2bn(BIGNUM **bn, const char *a)
182 int neg = 0, h, m, i, j, k, c;
185 if ((a == NULL) || (*a == '\0'))
193 for (i = 0; i <= (INT_MAX/4) && isxdigit((unsigned char)a[i]); i++)
203 /* a is the start of the hex digits, and it is 'i' long */
205 if ((ret = BN_new()) == NULL)
212 /* i is the number of hex digits */
213 if (bn_expand(ret, i * 4) == NULL)
216 j = i; /* least significant 'hex' */
220 m = ((BN_BYTES * 2) <= j) ? (BN_BYTES * 2) : j;
224 if ((c >= '0') && (c <= '9'))
226 else if ((c >= 'a') && (c <= 'f'))
228 else if ((c >= 'A') && (c <= 'F'))
231 k = 0; /* paranoia */
254 int BN_dec2bn(BIGNUM **bn, const char *a)
261 if ((a == NULL) || (*a == '\0'))
268 for (i = 0; i <= (INT_MAX/4) && isdigit((unsigned char)a[i]); i++)
279 * a is the start of the digits, and it is 'i' long. We chop it into
280 * BN_DEC_NUM digits at a time
283 if ((ret = BN_new()) == NULL)
290 /* i is the number of digits, a bit of an over expand */
291 if (bn_expand(ret, i * 4) == NULL)
294 j = BN_DEC_NUM - (i % BN_DEC_NUM);
302 if (++j == BN_DEC_NUM) {
303 BN_mul_word(ret, BN_DEC_CONV);
321 int BN_asc2bn(BIGNUM **bn, const char *a)
327 if (p[0] == '0' && (p[1] == 'X' || p[1] == 'x')) {
328 if (!BN_hex2bn(bn, p + 2))
331 if (!BN_dec2bn(bn, p))
339 #ifndef OPENSSL_NO_BIO
340 # ifndef OPENSSL_NO_FP_API
341 int BN_print_fp(FILE *fp, const BIGNUM *a)
346 if ((b = BIO_new(BIO_s_file())) == NULL)
348 BIO_set_fp(b, fp, BIO_NOCLOSE);
349 ret = BN_print(b, a);
355 int BN_print(BIO *bp, const BIGNUM *a)
360 if ((a->neg) && (BIO_write(bp, "-", 1) != 1))
362 if (BN_is_zero(a) && (BIO_write(bp, "0", 1) != 1))
364 for (i = a->top - 1; i >= 0; i--) {
365 for (j = BN_BITS2 - 4; j >= 0; j -= 4) {
366 /* strip leading zeros */
367 v = ((int)(a->d[i] >> (long)j)) & 0x0f;
369 if (BIO_write(bp, &(Hex[v]), 1) != 1)
381 char *BN_options(void)
384 static char data[16];
389 BIO_snprintf(data, sizeof data, "bn(%d,%d)",
390 (int)sizeof(BN_ULLONG) * 8, (int)sizeof(BN_ULONG) * 8);
392 BIO_snprintf(data, sizeof data, "bn(%d,%d)",
393 (int)sizeof(BN_ULONG) * 8, (int)sizeof(BN_ULONG) * 8);