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)
76 return OPENSSL_strdup("0");
77 buf = OPENSSL_malloc(a->top * BN_BYTES * 2 + 2);
79 BNerr(BN_F_BN_BN2HEX, ERR_R_MALLOC_FAILURE);
87 for (i = a->top - 1; i >= 0; i--) {
88 for (j = BN_BITS2 - 8; j >= 0; j -= 8) {
89 /* strip leading zeros */
90 v = ((int)(a->d[i] >> (long)j)) & 0xff;
93 *(p++) = Hex[v & 0x0f];
103 /* Must 'OPENSSL_free' the returned data */
104 char *BN_bn2dec(const BIGNUM *a)
106 int i = 0, num, ok = 0;
110 BN_ULONG *bn_data = NULL, *lp;
114 * get an upper bound for the length of the decimal integer
115 * num <= (BN_num_bits(a) + 1) * log(2)
116 * <= 3 * BN_num_bits(a) * 0.1001 + log(2) + 1 (rounding error)
117 * <= BN_num_bits(a)/10 + BN_num_bits/1000 + 1 + 1
119 i = BN_num_bits(a) * 3;
120 num = (i / 10 + i / 1000 + 1) + 1;
121 bn_data_num = num / BN_DEC_NUM + 1;
122 bn_data = OPENSSL_malloc(bn_data_num * sizeof(BN_ULONG));
123 buf = OPENSSL_malloc(num + 3);
124 if ((buf == NULL) || (bn_data == NULL)) {
125 BNerr(BN_F_BN_BN2DEC, ERR_R_MALLOC_FAILURE);
128 if ((t = BN_dup(a)) == NULL)
131 #define BUF_REMAIN (num+3 - (size_t)(p - buf))
138 if (BN_is_negative(t))
141 while (!BN_is_zero(t)) {
142 if (lp - bn_data >= bn_data_num)
144 *lp = BN_div_word(t, BN_DEC_CONV);
145 if (*lp == (BN_ULONG)-1)
151 * We now have a series of blocks, BN_DEC_NUM chars in length, where
152 * the last one needs truncation. The blocks need to be reversed in
155 BIO_snprintf(p, BUF_REMAIN, BN_DEC_FMT1, *lp);
158 while (lp != bn_data) {
160 BIO_snprintf(p, BUF_REMAIN, BN_DEC_FMT2, *lp);
168 OPENSSL_free(bn_data);
179 int BN_hex2bn(BIGNUM **bn, const char *a)
183 int neg = 0, h, m, i, j, k, c;
186 if ((a == NULL) || (*a == '\0'))
194 for (i = 0; i <= (INT_MAX/4) && isxdigit((unsigned char)a[i]); i++)
204 /* a is the start of the hex digits, and it is 'i' long */
206 if ((ret = BN_new()) == NULL)
213 /* i is the number of hex digits */
214 if (bn_expand(ret, i * 4) == NULL)
217 j = i; /* least significant 'hex' */
221 m = ((BN_BYTES * 2) <= j) ? (BN_BYTES * 2) : j;
225 if ((c >= '0') && (c <= '9'))
227 else if ((c >= 'a') && (c <= 'f'))
229 else if ((c >= 'A') && (c <= 'F'))
232 k = 0; /* paranoia */
247 /* Don't set the negative flag if it's zero. */
257 int BN_dec2bn(BIGNUM **bn, const char *a)
264 if ((a == NULL) || (*a == '\0'))
271 for (i = 0; i <= (INT_MAX/4) && isdigit((unsigned char)a[i]); i++)
282 * a is the start of the digits, and it is 'i' long. We chop it into
283 * BN_DEC_NUM digits at a time
286 if ((ret = BN_new()) == NULL)
293 /* i is the number of digits, a bit of an over expand */
294 if (bn_expand(ret, i * 4) == NULL)
297 j = BN_DEC_NUM - (i % BN_DEC_NUM);
305 if (++j == BN_DEC_NUM) {
306 BN_mul_word(ret, BN_DEC_CONV);
316 /* Don't set the negative flag if it's zero. */
326 int BN_asc2bn(BIGNUM **bn, const char *a)
333 if (p[0] == '0' && (p[1] == 'X' || p[1] == 'x')) {
334 if (!BN_hex2bn(bn, p + 2))
337 if (!BN_dec2bn(bn, p))
340 /* Don't set the negative flag if it's zero. */
341 if (*a == '-' && (*bn)->top != 0)
346 #ifndef OPENSSL_NO_BIO
347 # ifndef OPENSSL_NO_FP_API
348 int BN_print_fp(FILE *fp, const BIGNUM *a)
353 if ((b = BIO_new(BIO_s_file())) == NULL)
355 BIO_set_fp(b, fp, BIO_NOCLOSE);
356 ret = BN_print(b, a);
362 int BN_print(BIO *bp, const BIGNUM *a)
367 if ((a->neg) && (BIO_write(bp, "-", 1) != 1))
369 if (BN_is_zero(a) && (BIO_write(bp, "0", 1) != 1))
371 for (i = a->top - 1; i >= 0; i--) {
372 for (j = BN_BITS2 - 4; j >= 0; j -= 4) {
373 /* strip leading zeros */
374 v = ((int)(a->d[i] >> (long)j)) & 0x0f;
376 if (BIO_write(bp, &(Hex[v]), 1) != 1)
388 char *BN_options(void)
391 static char data[16];
396 BIO_snprintf(data, sizeof data, "bn(%d,%d)",
397 (int)sizeof(BN_ULLONG) * 8, (int)sizeof(BN_ULONG) * 8);
399 BIO_snprintf(data, sizeof data, "bn(%d,%d)",
400 (int)sizeof(BN_ULONG) * 8, (int)sizeof(BN_ULONG) * 8);