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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/bn/bn_print.c
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 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;
123 (BN_ULONG
*)OPENSSL_malloc((num
/ BN_DEC_NUM
+ 1) * sizeof(BN_ULONG
));
124 buf
= (char *)OPENSSL_malloc(num
+ 3);
125 if ((buf
== NULL
) || (bn_data
== NULL
)) {
126 BNerr(BN_F_BN_BN2DEC
, ERR_R_MALLOC_FAILURE
);
129 if ((t
= BN_dup(a
)) == NULL
)
132 #define BUF_REMAIN (num+3 - (size_t)(p - buf))
139 if (BN_is_negative(t
))
143 while (!BN_is_zero(t
)) {
144 *lp
= BN_div_word(t
, BN_DEC_CONV
);
149 * We now have a series of blocks, BN_DEC_NUM chars in length, where
150 * the last one needs truncation. The blocks need to be reversed in
153 BIO_snprintf(p
, BUF_REMAIN
, BN_DEC_FMT1
, *lp
);
156 while (lp
!= bn_data
) {
158 BIO_snprintf(p
, BUF_REMAIN
, BN_DEC_FMT2
, *lp
);
166 OPENSSL_free(bn_data
);
177 int BN_hex2bn(BIGNUM
**bn
, const char *a
)
181 int neg
= 0, h
, m
, i
, j
, k
, c
;
184 if ((a
== NULL
) || (*a
== '\0'))
192 for (i
= 0; isxdigit((unsigned char)a
[i
]); i
++) ;
198 /* a is the start of the hex digits, and it is 'i' long */
200 if ((ret
= BN_new()) == NULL
)
207 /* i is the number of hex digests; */
208 if (bn_expand(ret
, i
* 4) == NULL
)
211 j
= i
; /* least significant 'hex' */
215 m
= ((BN_BYTES
* 2) <= j
) ? (BN_BYTES
* 2) : j
;
219 if ((c
>= '0') && (c
<= '9'))
221 else if ((c
>= 'a') && (c
<= 'f'))
223 else if ((c
>= 'A') && (c
<= 'F'))
226 k
= 0; /* paranoia */
249 int BN_dec2bn(BIGNUM
**bn
, const char *a
)
256 if ((a
== NULL
) || (*a
== '\0'))
263 for (i
= 0; isdigit((unsigned char)a
[i
]); i
++) ;
270 * a is the start of the digits, and it is 'i' long. We chop it into
271 * BN_DEC_NUM digits at a time
274 if ((ret
= BN_new()) == NULL
)
281 /* i is the number of digests, a bit of an over expand; */
282 if (bn_expand(ret
, i
* 4) == NULL
)
285 j
= BN_DEC_NUM
- (i
% BN_DEC_NUM
);
293 if (++j
== BN_DEC_NUM
) {
294 BN_mul_word(ret
, BN_DEC_CONV
);
312 #ifndef OPENSSL_NO_BIO
313 # ifndef OPENSSL_NO_FP_API
314 int BN_print_fp(FILE *fp
, const BIGNUM
*a
)
319 if ((b
= BIO_new(BIO_s_file())) == NULL
)
321 BIO_set_fp(b
, fp
, BIO_NOCLOSE
);
322 ret
= BN_print(b
, a
);
328 int BN_print(BIO
*bp
, const BIGNUM
*a
)
333 if ((a
->neg
) && (BIO_write(bp
, "-", 1) != 1))
335 if (BN_is_zero(a
) && (BIO_write(bp
, "0", 1) != 1))
337 for (i
= a
->top
- 1; i
>= 0; i
--) {
338 for (j
= BN_BITS2
- 4; j
>= 0; j
-= 4) {
339 /* strip leading zeros */
340 v
= ((int)(a
->d
[i
] >> (long)j
)) & 0x0f;
342 if (BIO_write(bp
, &(Hex
[v
]), 1) != 1)