1 /* $OpenBSD: x_long.c,v 1.16 2019/04/20 11:13:15 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 /* 67 * Custom primitive type for long handling. This converts between an 68 * ASN1_INTEGER and a long directly. 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, 75 const ASN1_ITEM *it); 76 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, 77 int utype, char *free_cont, const ASN1_ITEM *it); 78 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, 79 int indent, const ASN1_PCTX *pctx); 80 81 static ASN1_PRIMITIVE_FUNCS long_pf = { 82 .app_data = NULL, 83 .flags = 0, 84 .prim_new = long_new, 85 .prim_free = long_free, 86 .prim_clear = long_free, /* Clear should set to initial value */ 87 .prim_c2i = long_c2i, 88 .prim_i2c = long_i2c, 89 .prim_print = long_print, 90 }; 91 92 const ASN1_ITEM LONG_it = { 93 .itype = ASN1_ITYPE_PRIMITIVE, 94 .utype = V_ASN1_INTEGER, 95 .templates = NULL, 96 .tcount = 0, 97 .funcs = &long_pf, 98 .size = ASN1_LONG_UNDEF, 99 .sname = "LONG", 100 }; 101 102 const ASN1_ITEM ZLONG_it = { 103 .itype = ASN1_ITYPE_PRIMITIVE, 104 .utype = V_ASN1_INTEGER, 105 .templates = NULL, 106 .tcount = 0, 107 .funcs = &long_pf, 108 .size = 0, 109 .sname = "ZLONG", 110 }; 111 112 static int 113 long_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 114 { 115 *(long *)pval = it->size; 116 return 1; 117 } 118 119 static void 120 long_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 121 { 122 *(long *)pval = it->size; 123 } 124 125 static int 126 long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, 127 const ASN1_ITEM *it) 128 { 129 long ltmp; 130 unsigned long utmp; 131 int clen, pad, i; 132 /* this exists to bypass broken gcc optimization */ 133 char *cp = (char *)pval; 134 135 /* use memcpy, because we may not be long aligned */ 136 memcpy(<mp, cp, sizeof(long)); 137 138 if (ltmp == it->size) 139 return -1; 140 /* Convert the long to positive: we subtract one if negative so 141 * we can cleanly handle the padding if only the MSB of the leading 142 * octet is set. 143 */ 144 if (ltmp < 0) 145 utmp = -(ltmp + 1); 146 else 147 utmp = ltmp; 148 clen = BN_num_bits_word(utmp); 149 /* If MSB of leading octet set we need to pad */ 150 if (!(clen & 0x7)) 151 pad = 1; 152 else 153 pad = 0; 154 155 /* Convert number of bits to number of octets */ 156 clen = (clen + 7) >> 3; 157 158 if (cont) { 159 if (pad) 160 *cont++ = (ltmp < 0) ? 0xff : 0; 161 for (i = clen - 1; i >= 0; i--) { 162 cont[i] = (unsigned char)(utmp & 0xff); 163 if (ltmp < 0) 164 cont[i] ^= 0xff; 165 utmp >>= 8; 166 } 167 } 168 return clen + pad; 169 } 170 171 static int 172 long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, 173 char *free_cont, const ASN1_ITEM *it) 174 { 175 int neg, i; 176 long ltmp; 177 unsigned long utmp = 0; 178 char *cp = (char *)pval; 179 if (len > (int)sizeof(long)) { 180 ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 181 return 0; 182 } 183 /* Is it negative? */ 184 if (len && (cont[0] & 0x80)) 185 neg = 1; 186 else 187 neg = 0; 188 utmp = 0; 189 for (i = 0; i < len; i++) { 190 utmp <<= 8; 191 if (neg) 192 utmp |= cont[i] ^ 0xff; 193 else 194 utmp |= cont[i]; 195 } 196 ltmp = (long)utmp; 197 if (neg) { 198 ltmp = -ltmp; 199 ltmp--; 200 } 201 if (ltmp == it->size) { 202 ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 203 return 0; 204 } 205 memcpy(cp, <mp, sizeof(long)); 206 return 1; 207 } 208 209 static int 210 long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, 211 const ASN1_PCTX *pctx) 212 { 213 if (BIO_printf(out, "%ld\n", *(long *)pval) <= 0) 214 return 0; 215 216 return 1; 217 } 218