/*

 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/objects.h>

#include <openssl/buffer.h>

#include "crypto/bn.h"

/* Number of octets per line */

#define ASN1_BUF_PRINT_WIDTH 15

/* Maximum indent */

#define ASN1_PRINT_MAX_INDENT 128

int ASN1_buf_print(BIO *bp, const unsigned char *buf, size_t buflen, int indent)

{

    size_t i;

    for (i = 0; i < buflen; i++) {

        if ((i % ASN1_BUF_PRINT_WIDTH) == 0) {

            if (i > 0 && BIO_puts(bp, "\n") <= 0)

                return 0;

            if (!BIO_indent(bp, indent, ASN1_PRINT_MAX_INDENT))

                return 0;

        }

        /*

         * Use colon separators for each octet for compatibility as

         * this function is used to print out key components.

         */

        if (BIO_printf(bp, "%02x%s", buf[i],

                (i == buflen - 1) ? "" : ":")

            <= 0)

            return 0;

    }

    if (BIO_write(bp, "\n", 1) <= 0)

        return 0;

    return 1;

}

int ASN1_bn_print(BIO *bp, const char *number, const BIGNUM *num,

    unsigned char *ign, int indent)

{

    int n, rv = 0;

    const char *neg;

    unsigned char *buf = NULL, *tmp = NULL;

    int buflen;

    if (num == NULL)

        return 1;

    neg = BN_is_negative(num) ? "-" : "";

    if (!BIO_indent(bp, indent, ASN1_PRINT_MAX_INDENT))

        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;

        return 1;

    }

    buflen = BN_num_bytes(num) + 1;

    buf = tmp = OPENSSL_malloc(buflen);

    if (buf == NULL)

        goto err;

    buf[0] = 0;

    if (BIO_printf(bp, "%s%s\n", number,

            (neg[0] == '-') ? " (Negative)" : "")

        <= 0)

        goto err;

    n = BN_bn2bin(num, buf + 1);

    if (buf[1] & 0x80)

        n++;

    else

        tmp++;

    if (ASN1_buf_print(bp, tmp, n, indent + 4) == 0)

        goto err;

    rv = 1;

err:

    OPENSSL_clear_free(buf, buflen);

    return rv;

}