1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
61 #include "internal/cryptlib.h"
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 if (a->neg && BN_is_zero(a)) {
75 /* "-0" == 3 bytes including NULL terminator */
76 buf = OPENSSL_malloc(3);
78 buf = OPENSSL_malloc(a->top * BN_BYTES * 2 + 2);
81 BNerr(BN_F_BN_BN2HEX, ERR_R_MALLOC_FAILURE);
89 for (i = a->top - 1; i >= 0; i--) {
90 for (j = BN_BITS2 - 8; j >= 0; j -= 8) {
91 /* strip leading zeros */
92 v = ((int)(a->d[i] >> (long)j)) & 0xff;
95 *(p++) = Hex[v & 0x0f];
105 /* Must 'OPENSSL_free' the returned data */
106 char *BN_bn2dec(const BIGNUM *a)
108 int i = 0, num, ok = 0;
112 BN_ULONG *bn_data = NULL, *lp;
115 * get an upper bound for the length of the decimal integer
116 * num <= (BN_num_bits(a) + 1) * log(2)
117 * <= 3 * BN_num_bits(a) * 0.1001 + log(2) + 1 (rounding error)
118 * <= BN_num_bits(a)/10 + BN_num_bits/1000 + 1 + 1
120 i = BN_num_bits(a) * 3;
121 num = (i / 10 + i / 1000 + 1) + 1;
122 bn_data = OPENSSL_malloc((num / BN_DEC_NUM + 1) * 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))
142 while (!BN_is_zero(t)) {
143 *lp = BN_div_word(t, BN_DEC_CONV);
148 * We now have a series of blocks, BN_DEC_NUM chars in length, where
149 * the last one needs truncation. The blocks need to be reversed in
152 BIO_snprintf(p, BUF_REMAIN, BN_DEC_FMT1, *lp);
155 while (lp != bn_data) {
157 BIO_snprintf(p, BUF_REMAIN, BN_DEC_FMT2, *lp);
164 OPENSSL_free(bn_data);
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'))
187 for (i = 0; i <= (INT_MAX/4) && isxdigit((unsigned char)a[i]); i++)
197 /* a is the start of the hex digits, and it is 'i' long */
199 if ((ret = BN_new()) == NULL)
206 /* i is the number of hex digits */
207 if (bn_expand(ret, i * 4) == NULL)
210 j = i; /* least significant 'hex' */
214 m = ((BN_BYTES * 2) <= j) ? (BN_BYTES * 2) : j;
218 k = OPENSSL_hexchar2int(c);
220 k = 0; /* paranoia */
243 int BN_dec2bn(BIGNUM **bn, const char *a)
250 if ((a == NULL) || (*a == '\0'))
257 for (i = 0; i <= (INT_MAX/4) && isdigit((unsigned char)a[i]); i++)
268 * a is the start of the digits, and it is 'i' long. We chop it into
269 * BN_DEC_NUM digits at a time
272 if ((ret = BN_new()) == NULL)
279 /* i is the number of digits, a bit of an over expand */
280 if (bn_expand(ret, i * 4) == NULL)
283 j = BN_DEC_NUM - (i % BN_DEC_NUM);
291 if (++j == BN_DEC_NUM) {
292 BN_mul_word(ret, BN_DEC_CONV);
310 int BN_asc2bn(BIGNUM **bn, const char *a)
316 if (p[0] == '0' && (p[1] == 'X' || p[1] == 'x')) {
317 if (!BN_hex2bn(bn, p + 2))
320 if (!BN_dec2bn(bn, p))
328 # ifndef OPENSSL_NO_STDIO
329 int BN_print_fp(FILE *fp, const BIGNUM *a)
334 if ((b = BIO_new(BIO_s_file())) == NULL)
336 BIO_set_fp(b, fp, BIO_NOCLOSE);
337 ret = BN_print(b, a);
343 int BN_print(BIO *bp, const BIGNUM *a)
348 if ((a->neg) && (BIO_write(bp, "-", 1) != 1))
350 if (BN_is_zero(a) && (BIO_write(bp, "0", 1) != 1))
352 for (i = a->top - 1; i >= 0; i--) {
353 for (j = BN_BITS2 - 4; j >= 0; j -= 4) {
354 /* strip leading zeros */
355 v = ((int)(a->d[i] >> (long)j)) & 0x0f;
357 if (BIO_write(bp, &(Hex[v]), 1) != 1)
368 char *BN_options(void)
371 static char data[16];
376 BIO_snprintf(data, sizeof data, "bn(%d,%d)",
377 (int)sizeof(BN_ULLONG) * 8, (int)sizeof(BN_ULONG) * 8);
379 BIO_snprintf(data, sizeof data, "bn(%d,%d)",
380 (int)sizeof(BN_ULONG) * 8, (int)sizeof(BN_ULONG) * 8);