openssl/crypto/asn1/t_pkey.c

/* crypto/asn1/t_pkey.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/objects.h>
#include <openssl/buffer.h>
#include "internal/bn_int.h"

int ASN1_bn_print(BIO *bp, const char *number, const BIGNUM *num,
                  unsigned char *buf, int off)
{
    int n, i;
    const char *neg;

    if (num == NULL)
        return (1);
    neg = (BN_is_negative(num)) ? "-" : "";
    if (!BIO_indent(bp, off, 128))
        return 0;
    if (BN_is_zero(num)) {
        if (BIO_printf(bp, "%s 0\n", number) <= 0)
            return 0;
        return 1;
    }

    if (BN_num_bytes(num) <= BN_BYTES) {
        if (BIO_printf(bp, "%s %s%lu (%s0x%lx)\n", number, neg,
                       (unsigned long)bn_get_words(num)[0], neg,
                       (unsigned long)bn_get_words(num)[0]) <= 0)
            return (0);
    } else {
        buf[0] = 0;
        if (BIO_printf(bp, "%s%s", number,
                       (neg[0] == '-') ? " (Negative)" : "") <= 0)
            return (0);
        n = BN_bn2bin(num, &buf[1]);

        if (buf[1] & 0x80)
            n++;
        else
            buf++;

        for (i = 0; i < n; i++) {
            if ((i % 15) == 0) {
                if (BIO_puts(bp, "\n") <= 0 || !BIO_indent(bp, off + 4, 128))
                    return 0;
            }
            if (BIO_printf(bp, "%02x%s", buf[i], ((i + 1) == n) ? "" : ":")
                <= 0)
                return (0);
        }
        if (BIO_write(bp, "\n", 1) <= 0)
            return (0);
    }
    return (1);
}