/* crypto/asn1/f_int.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 "cryptlib.h"

#include <openssl/buffer.h>

#include <openssl/asn1.h>

int i2a_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *a)

{

    int i, n = 0;

    static const char *h = "0123456789ABCDEF";

    char buf[2];

    if (a == NULL)

        return (0);

    if (a->type & V_ASN1_NEG) {

        if (BIO_write(bp, "-", 1) != 1)

            goto err;

        n = 1;

    }

    if (a->length == 0) {

        if (BIO_write(bp, "00", 2) != 2)

            goto err;

        n += 2;

    } else {

        for (i = 0; i < a->length; i++) {

            if ((i != 0) && (i % 35 == 0)) {

                if (BIO_write(bp, "\\\n", 2) != 2)

                    goto err;

                n += 2;

            }

            buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];

            buf[1] = h[((unsigned char)a->data[i]) & 0x0f];

            if (BIO_write(bp, buf, 2) != 2)

                goto err;

            n += 2;

        }

    }

    return (n);

 err:

    return (-1);

}

int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)

{

    int ret = 0;

    int i, j, k, m, n, again, bufsize;

    unsigned char *s = NULL, *sp;

    unsigned char *bufp;

    int num = 0, slen = 0, first = 1;

    bs->type = V_ASN1_INTEGER;

    bufsize = BIO_gets(bp, buf, size);

    for (;;) {

        if (bufsize < 1)

            goto err_sl;

        i = bufsize;

        if (buf[i - 1] == '\n')

            buf[--i] = '\0';

        if (i == 0)

            goto err_sl;

        if (buf[i - 1] == '\r')

            buf[--i] = '\0';

        if (i == 0)

            goto err_sl;

        again = (buf[i - 1] == '\\');

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

#ifndef CHARSET_EBCDIC

            if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||

                  ((buf[j] >= 'a') && (buf[j] <= 'f')) ||

                  ((buf[j] >= 'A') && (buf[j] <= 'F'))))

#else

            /*

             * This #ifdef is not strictly necessary, since the characters

             * A...F a...f 0...9 are contiguous (yes, even in EBCDIC - but

             * not the whole alphabet). Nevertheless, isxdigit() is faster.

             */

            if (!isxdigit(buf[j]))

#endif

            {

                i = j;

                break;

            }

        }

        buf[i] = '\0';

        /*

         * We have now cleared all the crap off the end of the line

         */

        if (i < 2)

            goto err_sl;

        bufp = (unsigned char *)buf;

        if (first) {

            first = 0;

            if ((bufp[0] == '0') && (bufp[1] == '0')) {

                bufp += 2;

                i -= 2;

            }

        }

        k = 0;

        i -= again;

        if (i % 2 != 0) {

            ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_ODD_NUMBER_OF_CHARS);

            goto err;

        }

        i /= 2;

        if (num + i > slen) {

            if (s == NULL)

                sp = (unsigned char *)OPENSSL_malloc((unsigned int)num +

                                                     i * 2);

            else

                sp = OPENSSL_realloc_clean(s, slen, num + i * 2);

            if (sp == NULL) {

                ASN1err(ASN1_F_A2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);

                goto err;

            }

            s = sp;

            slen = num + i * 2;

        }

        for (j = 0; j < i; j++, k += 2) {

            for (n = 0; n < 2; n++) {

                m = bufp[k + n];

                if ((m >= '0') && (m <= '9'))

                    m -= '0';

                else if ((m >= 'a') && (m <= 'f'))

                    m = m - 'a' + 10;

                else if ((m >= 'A') && (m <= 'F'))

                    m = m - 'A' + 10;

                else {

                    ASN1err(ASN1_F_A2I_ASN1_INTEGER,

                            ASN1_R_NON_HEX_CHARACTERS);

                    goto err;

                }

                s[num + j] <<= 4;

                s[num + j] |= m;

            }

        }

        num += i;

        if (again)

            bufsize = BIO_gets(bp, buf, size);

        else

            break;

    }

    bs->length = num;

    bs->data = s;

    ret = 1;

 err:

    if (0) {

 err_sl:

        ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_SHORT_LINE);

    }

    if (ret != 1)

        OPENSSL_free(s);

    return (ret);

}