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 ASN1_ITEM_start(LONG) 89 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG" 90 ASN1_ITEM_end(LONG) 91 92 ASN1_ITEM_start(ZLONG) 93 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG" 94 ASN1_ITEM_end(ZLONG) 95 96 static int 97 long_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 98 { 99 *(long *)pval = it->size; 100 return 1; 101 } 102 103 static void 104 long_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 105 { 106 *(long *)pval = it->size; 107 } 108 109 static int 110 long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, 111 const ASN1_ITEM *it) 112 { 113 long ltmp; 114 unsigned long utmp; 115 int clen, pad, i; 116 /* this exists to bypass broken gcc optimization */ 117 char *cp = (char *)pval; 118 119 /* use memcpy, because we may not be long aligned */ 120 memcpy(<mp, cp, sizeof(long)); 121 122 if (ltmp == it->size) 123 return -1; 124 /* Convert the long to positive: we subtract one if negative so 125 * we can cleanly handle the padding if only the MSB of the leading 126 * octet is 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 156 long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, 157 char *free_cont, const ASN1_ITEM *it) 158 { 159 int neg, i; 160 long ltmp; 161 unsigned long utmp = 0; 162 char *cp = (char *)pval; 163 if (len > (int)sizeof(long)) { 164 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 165 return 0; 166 } 167 /* Is it negative? */ 168 if (len && (cont[0] & 0x80)) 169 neg = 1; 170 else 171 neg = 0; 172 utmp = 0; 173 for (i = 0; i < len; i++) { 174 utmp <<= 8; 175 if (neg) 176 utmp |= cont[i] ^ 0xff; 177 else 178 utmp |= cont[i]; 179 } 180 ltmp = (long)utmp; 181 if (neg) { 182 ltmp++; 183 ltmp = -ltmp; 184 } 185 if (ltmp == it->size) { 186 ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 187 return 0; 188 } 189 memcpy(cp, <mp, sizeof(long)); 190 return 1; 191 } 192 193 static int 194 long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, 195 const ASN1_PCTX *pctx) 196 { 197 return BIO_printf(out, "%ld\n", *(long *)pval); 198 } 199