1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 59 #include <openssl/asn1t.h> 60 #include <openssl/bn.h> 61 #include <openssl/err.h> 62 #include <openssl/mem.h> 63 64 65 /* Custom primitive type for long handling. This converts between an ASN1_INTEGER 66 * and a long directly. 67 */ 68 69 70 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it); 71 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it); 72 73 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); 74 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); 75 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx); 76 77 static ASN1_PRIMITIVE_FUNCS long_pf = { 78 NULL, 0, 79 long_new, 80 long_free, 81 long_free, /* Clear should set to initial value */ 82 long_c2i, 83 long_i2c, 84 long_print 85 }; 86 87 ASN1_ITEM_start(LONG) 88 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG" 89 ASN1_ITEM_end(LONG) 90 91 ASN1_ITEM_start(ZLONG) 92 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG" 93 ASN1_ITEM_end(ZLONG) 94 95 static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 96 { 97 *(long *)pval = it->size; 98 return 1; 99 } 100 101 static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 102 { 103 *(long *)pval = it->size; 104 } 105 106 static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it) 107 { 108 long ltmp; 109 unsigned long utmp; 110 int clen, pad, i; 111 /* this exists to bypass broken gcc optimization */ 112 char *cp = (char *)pval; 113 114 /* use memcpy, because we may not be long aligned */ 115 memcpy(<mp, cp, sizeof(long)); 116 117 if(ltmp == it->size) return -1; 118 /* Convert the long to positive: we subtract one if negative so 119 * we can cleanly handle the padding if only the MSB of the leading 120 * octet is set. 121 */ 122 if(ltmp < 0) utmp = -ltmp - 1; 123 else utmp = ltmp; 124 clen = BN_num_bits_word(utmp); 125 /* If MSB of leading octet set we need to pad */ 126 if(!(clen & 0x7)) pad = 1; 127 else pad = 0; 128 129 /* Convert number of bits to number of octets */ 130 clen = (clen + 7) >> 3; 131 132 if(cont) { 133 if(pad) *cont++ = (ltmp < 0) ? 0xff : 0; 134 for(i = clen - 1; i >= 0; i--) { 135 cont[i] = (unsigned char)(utmp & 0xff); 136 if(ltmp < 0) cont[i] ^= 0xff; 137 utmp >>= 8; 138 } 139 } 140 return clen + pad; 141 } 142 143 static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, 144 int utype, char *free_cont, const ASN1_ITEM *it) 145 { 146 int neg, i; 147 long ltmp; 148 unsigned long utmp = 0; 149 char *cp = (char *)pval; 150 if(len > (int)sizeof(long)) { 151 OPENSSL_PUT_ERROR(ASN1, long_c2i, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 152 return 0; 153 } 154 /* Is it negative? */ 155 if(len && (cont[0] & 0x80)) neg = 1; 156 else neg = 0; 157 utmp = 0; 158 for(i = 0; i < len; i++) { 159 utmp <<= 8; 160 if(neg) utmp |= cont[i] ^ 0xff; 161 else utmp |= cont[i]; 162 } 163 ltmp = (long)utmp; 164 if(neg) { 165 ltmp++; 166 ltmp = -ltmp; 167 } 168 if(ltmp == it->size) { 169 OPENSSL_PUT_ERROR(ASN1, long_c2i, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); 170 return 0; 171 } 172 memcpy(cp, <mp, sizeof(long)); 173 return 1; 174 } 175 176 static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, 177 int indent, const ASN1_PCTX *pctx) 178 { 179 return BIO_printf(out, "%ld\n", *(long *)pval); 180 } 181
