1 /* $OpenBSD: x_long.c,v 1.9 2014/07/11 08:44:47 jsing Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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 <string.h> 61 62 #include <openssl/asn1t.h> 63 #include <openssl/bn.h> 64 #include <openssl/err.h> 65 66 /* Custom primitive type for long handling. This converts between an ASN1_INTEGER 67 * and a long directly. 68 */ 69 70 71 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it); 72 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it); 73 74 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); 75 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); 76 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx); 77 78 static ASN1_PRIMITIVE_FUNCS long_pf = { 79 NULL, 0, 80 long_new, 81 long_free, 82 long_free, /* Clear should set to initial value */ 83 long_c2i, 84 long_i2c, 85 long_print 86 }; 87 88 const ASN1_ITEM LONG_it = { 89 .itype = ASN1_ITYPE_PRIMITIVE, 90 .utype = V_ASN1_INTEGER, 91 .templates = NULL, 92 .tcount = 0, 93 .funcs = &long_pf, 94 .size = ASN1_LONG_UNDEF, 95 .sname = "LONG", 96 }; 97 98 const ASN1_ITEM ZLONG_it = { 99 .itype = ASN1_ITYPE_PRIMITIVE, 100 .utype = V_ASN1_INTEGER, 101 .templates = NULL, 102 .tcount = 0, 103 .funcs = &long_pf, 104 .size = 0, 105 .sname = "ZLONG", 106 }; 107 108 static int 109 long_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 110 { 111 *(long *)pval = it->size; 112 return 1; 113 } 114 115 static void 116 long_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 117 { 118 *(long *)pval = it->size; 119 } 120 121 static int 122 long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, 123 const ASN1_ITEM *it) 124 { 125 long ltmp; 126 unsigned long utmp; 127 int clen, pad, i; 128 /* this exists to bypass broken gcc optimization */ 129 char *cp = (char *)pval; 130 131 /* use memcpy, because we may not be long aligned */ 132 memcpy(<mp, cp, sizeof(long)); 133 134 if (ltmp == it->size) 135 return -1; 136 /* Convert the long to positive: we subtract one if negative so 137 * we can cleanly handle the padding if only the MSB of the leading 138 * octet is set. 139 */ 140 if (ltmp < 0) 141 utmp = -ltmp - 1; 142 else 143 utmp = ltmp; 144 clen = BN_num_bits_word(utmp); 145 /* If MSB of leading octet set we need to pad */ 146 if (!(clen & 0x7)) 147 pad = 1; 148 else 149 pad = 0; 150 151 /* Convert number of bits to number of octets */ 152 clen = (clen + 7) >> 3; 153 154 if (cont) { 155 if (pad) 156 *cont++ = (ltmp < 0) ? 0xff : 0; 157 for (i = clen - 1; i >= 0; i--) { 158 cont[i] = (unsigned char)(utmp & 0xff); 159 if (ltmp < 0) 160 cont[i] ^= 0xff; 161 utmp >>= 8; 162 } 163 } 164 return clen + pad; 165 } 166 167 static int 168 long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, 169 char *free_cont, const ASN1_ITEM *it) 170 { 171 int neg, i; 172 long ltmp; 173 unsigned long utmp = 0; 174 char *cp = (char *)pval; 175 if (len > (int)sizeof(long)) { 176 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 177 return 0; 178 } 179 /* Is it negative? */ 180 if (len && (cont[0] & 0x80)) 181 neg = 1; 182 else 183 neg = 0; 184 utmp = 0; 185 for (i = 0; i < len; i++) { 186 utmp <<= 8; 187 if (neg) 188 utmp |= cont[i] ^ 0xff; 189 else 190 utmp |= cont[i]; 191 } 192 ltmp = (long)utmp; 193 if (neg) { 194 ltmp++; 195 ltmp = -ltmp; 196 } 197 if (ltmp == it->size) { 198 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 199 return 0; 200 } 201 memcpy(cp, <mp, sizeof(long)); 202 return 1; 203 } 204 205 static int 206 long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, 207 const ASN1_PCTX *pctx) 208 { 209 return BIO_printf(out, "%ld\n", *(long *)pval); 210 } 211