crypto/openssl/crypto/asn1/x_long.c

   1 /* x_long.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  62 #include <openssl/asn1t.h>
  63 #include <openssl/bn.h>
  64
  65 /*
  66  * Custom primitive type for long handling. This converts between an
  67  * ASN1_INTEGER and a long directly.
  68  */
  69
  70 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
  71 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
  72
  73 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
  74                     const ASN1_ITEM *it);
  75 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
  76                     int utype, char *free_cont, const ASN1_ITEM *it);
  77 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
  78                       int indent, const ASN1_PCTX *pctx);
  79
  80 static ASN1_PRIMITIVE_FUNCS long_pf = {
  81     NULL, 0,
  82     long_new,
  83     long_free,
  84     long_free,                  /* Clear should set to initial value */
  85     long_c2i,
  86     long_i2c,
  87     long_print
  88 };
  89
  90 ASN1_ITEM_start(LONG)
  91         ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
  92 ASN1_ITEM_end(LONG)
  93
  94 ASN1_ITEM_start(ZLONG)
  95         ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
  96 ASN1_ITEM_end(ZLONG)
  97
  98 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
  99 {
 100     *(long *)pval = it->size;
 101     return 1;
 102 }
 103
 104 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 105 {
 106     *(long *)pval = it->size;
 107 }
 108
 109 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
 110                     const ASN1_ITEM *it)
 111 {
 112     long ltmp;
 113     unsigned long utmp;
 114     int clen, pad, i;
 115     /* this exists to bypass broken gcc optimization */
 116     char *cp = (char *)pval;
 117
 118     /* use memcpy, because we may not be long aligned */
 119     memcpy(&ltmp, cp, sizeof(long));
 120
 121     if (ltmp == it->size)
 122         return -1;
 123     /*
 124      * Convert the long to positive: we subtract one if negative so we can
 125      * cleanly handle the padding if only the MSB of the leading octet is
 126      * set.
 127      */
 128     if (ltmp < 0)
 129         utmp = -ltmp - 1;
 130     else
 131         utmp = ltmp;
 132     clen = BN_num_bits_word(utmp);
 133     /* If MSB of leading octet set we need to pad */
 134     if (!(clen & 0x7))
 135         pad = 1;
 136     else
 137         pad = 0;
 138
 139     /* Convert number of bits to number of octets */
 140     clen = (clen + 7) >> 3;
 141
 142     if (cont) {
 143         if (pad)
 144             *cont++ = (ltmp < 0) ? 0xff : 0;
 145         for (i = clen - 1; i >= 0; i--) {
 146             cont[i] = (unsigned char)(utmp & 0xff);
 147             if (ltmp < 0)
 148                 cont[i] ^= 0xff;
 149             utmp >>= 8;
 150         }
 151     }
 152     return clen + pad;
 153 }
 154
 155 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
 156                     int utype, char *free_cont, const ASN1_ITEM *it)
 157 {
 158     int neg, i;
 159     long ltmp;
 160     unsigned long utmp = 0;
 161     char *cp = (char *)pval;
 162     if (len > (int)sizeof(long)) {
 163         ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
 164         return 0;
 165     }
 166     /* Is it negative? */
 167     if (len && (cont[0] & 0x80))
 168         neg = 1;
 169     else
 170         neg = 0;
 171     utmp = 0;
 172     for (i = 0; i < len; i++) {
 173         utmp <<= 8;
 174         if (neg)
 175             utmp |= cont[i] ^ 0xff;
 176         else
 177             utmp |= cont[i];
 178     }
 179     ltmp = (long)utmp;
 180     if (neg) {
 181         ltmp++;
 182         ltmp = -ltmp;
 183     }
 184     if (ltmp == it->size) {
 185         ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
 186         return 0;
 187     }
 188     memcpy(cp, &ltmp, sizeof(long));
 189     return 1;
 190 }
 191
 192 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
 193                       int indent, const ASN1_PCTX *pctx)
 194 {
 195     return BIO_printf(out, "%ld\n", *(long *)pval);
 196 }