1/*
2 * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <openssl/bio.h>
12#include "bn_local.h"
13
14static const char Hex[] = "0123456789ABCDEF";
15
16#ifndef OPENSSL_NO_STDIO
17int BN_print_fp(FILE *fp, const BIGNUM *a)
18{
19    BIO *b;
20    int ret;
21
22    if ((b = BIO_new(BIO_s_file())) == NULL)
23        return 0;
24    BIO_set_fp(b, fp, BIO_NOCLOSE);
25    ret = BN_print(b, a);
26    BIO_free(b);
27    return ret;
28}
29#endif
30
31int BN_print(BIO *bp, const BIGNUM *a)
32{
33    int i, j, v, z = 0;
34    int ret = 0;
35
36    if ((a->neg) && BIO_write(bp, "-", 1) != 1)
37        goto end;
38    if (BN_is_zero(a) && BIO_write(bp, "0", 1) != 1)
39        goto end;
40    for (i = a->top - 1; i >= 0; i--) {
41        for (j = BN_BITS2 - 4; j >= 0; j -= 4) {
42            /* strip leading zeros */
43            v = (int)((a->d[i] >> j) & 0x0f);
44            if (z || v != 0) {
45                if (BIO_write(bp, &Hex[v], 1) != 1)
46                    goto end;
47                z = 1;
48            }
49        }
50    }
51    ret = 1;
52 end:
53    return ret;
54}
55
56char *BN_options(void)
57{
58    static int init = 0;
59    static char data[16];
60
61    if (!init) {
62        init++;
63#ifdef BN_LLONG
64        BIO_snprintf(data, sizeof(data), "bn(%zu,%zu)",
65                     sizeof(BN_ULLONG) * 8, sizeof(BN_ULONG) * 8);
66#else
67        BIO_snprintf(data, sizeof(data), "bn(%zu,%zu)",
68                     sizeof(BN_ULONG) * 8, sizeof(BN_ULONG) * 8);
69#endif
70    }
71    return data;
72}
73