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