x_long.c revision 296341
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 70static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it); 71static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it); 72 73static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, 74 const ASN1_ITEM *it); 75static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, 76 int utype, char *free_cont, const ASN1_ITEM *it); 77static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, 78 int indent, const ASN1_PCTX *pctx); 79 80static 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 90ASN1_ITEM_start(LONG) 91 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG" 92ASN1_ITEM_end(LONG) 93 94ASN1_ITEM_start(ZLONG) 95 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG" 96ASN1_ITEM_end(ZLONG) 97 98static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 99{ 100 *(long *)pval = it->size; 101 return 1; 102} 103 104static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 105{ 106 *(long *)pval = it->size; 107} 108 109static 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(<mp, 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 155static 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, <mp, sizeof(long)); 189 return 1; 190} 191 192static 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} 197