1*0Sstevel@tonic-gate /* x_bignum.c */ 2*0Sstevel@tonic-gate /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3*0Sstevel@tonic-gate * project 2000. 4*0Sstevel@tonic-gate */ 5*0Sstevel@tonic-gate /* ==================================================================== 6*0Sstevel@tonic-gate * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 7*0Sstevel@tonic-gate * 8*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 9*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 10*0Sstevel@tonic-gate * are met: 11*0Sstevel@tonic-gate * 12*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 13*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 14*0Sstevel@tonic-gate * 15*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 16*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in 17*0Sstevel@tonic-gate * the documentation and/or other materials provided with the 18*0Sstevel@tonic-gate * distribution. 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this 21*0Sstevel@tonic-gate * software must display the following acknowledgment: 22*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project 23*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24*0Sstevel@tonic-gate * 25*0Sstevel@tonic-gate * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26*0Sstevel@tonic-gate * endorse or promote products derived from this software without 27*0Sstevel@tonic-gate * prior written permission. For written permission, please contact 28*0Sstevel@tonic-gate * licensing@OpenSSL.org. 29*0Sstevel@tonic-gate * 30*0Sstevel@tonic-gate * 5. Products derived from this software may not be called "OpenSSL" 31*0Sstevel@tonic-gate * nor may "OpenSSL" appear in their names without prior written 32*0Sstevel@tonic-gate * permission of the OpenSSL Project. 33*0Sstevel@tonic-gate * 34*0Sstevel@tonic-gate * 6. Redistributions of any form whatsoever must retain the following 35*0Sstevel@tonic-gate * acknowledgment: 36*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project 37*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38*0Sstevel@tonic-gate * 39*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40*0Sstevel@tonic-gate * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42*0Sstevel@tonic-gate * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43*0Sstevel@tonic-gate * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44*0Sstevel@tonic-gate * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45*0Sstevel@tonic-gate * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46*0Sstevel@tonic-gate * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48*0Sstevel@tonic-gate * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49*0Sstevel@tonic-gate * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50*0Sstevel@tonic-gate * OF THE POSSIBILITY OF SUCH DAMAGE. 51*0Sstevel@tonic-gate * ==================================================================== 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * This product includes cryptographic software written by Eric Young 54*0Sstevel@tonic-gate * (eay@cryptsoft.com). This product includes software written by Tim 55*0Sstevel@tonic-gate * Hudson (tjh@cryptsoft.com). 56*0Sstevel@tonic-gate * 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate #include <stdio.h> 60*0Sstevel@tonic-gate #include "cryptlib.h" 61*0Sstevel@tonic-gate #include <openssl/asn1t.h> 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate /* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a 64*0Sstevel@tonic-gate * BIGNUM directly. Currently it ignores the sign which isn't a problem since all 65*0Sstevel@tonic-gate * BIGNUMs used are non negative and anything that looks negative is normally due 66*0Sstevel@tonic-gate * to an encoding error. 67*0Sstevel@tonic-gate */ 68*0Sstevel@tonic-gate 69*0Sstevel@tonic-gate #define BN_SENSITIVE 1 70*0Sstevel@tonic-gate 71*0Sstevel@tonic-gate static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it); 72*0Sstevel@tonic-gate static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it); 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); 75*0Sstevel@tonic-gate static int bn_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); 76*0Sstevel@tonic-gate 77*0Sstevel@tonic-gate static ASN1_PRIMITIVE_FUNCS bignum_pf = { 78*0Sstevel@tonic-gate NULL, 0, 79*0Sstevel@tonic-gate bn_new, 80*0Sstevel@tonic-gate bn_free, 81*0Sstevel@tonic-gate 0, 82*0Sstevel@tonic-gate bn_c2i, 83*0Sstevel@tonic-gate bn_i2c 84*0Sstevel@tonic-gate }; 85*0Sstevel@tonic-gate 86*0Sstevel@tonic-gate ASN1_ITEM_start(BIGNUM) 87*0Sstevel@tonic-gate ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM" 88*0Sstevel@tonic-gate ASN1_ITEM_end(BIGNUM) 89*0Sstevel@tonic-gate 90*0Sstevel@tonic-gate ASN1_ITEM_start(CBIGNUM) 91*0Sstevel@tonic-gate ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM" 92*0Sstevel@tonic-gate ASN1_ITEM_end(CBIGNUM) 93*0Sstevel@tonic-gate 94*0Sstevel@tonic-gate static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 95*0Sstevel@tonic-gate { 96*0Sstevel@tonic-gate *pval = (ASN1_VALUE *)BN_new(); 97*0Sstevel@tonic-gate if(*pval) return 1; 98*0Sstevel@tonic-gate else return 0; 99*0Sstevel@tonic-gate } 100*0Sstevel@tonic-gate 101*0Sstevel@tonic-gate static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 102*0Sstevel@tonic-gate { 103*0Sstevel@tonic-gate if(!*pval) return; 104*0Sstevel@tonic-gate if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval); 105*0Sstevel@tonic-gate else BN_free((BIGNUM *)*pval); 106*0Sstevel@tonic-gate *pval = NULL; 107*0Sstevel@tonic-gate } 108*0Sstevel@tonic-gate 109*0Sstevel@tonic-gate static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it) 110*0Sstevel@tonic-gate { 111*0Sstevel@tonic-gate BIGNUM *bn; 112*0Sstevel@tonic-gate int pad; 113*0Sstevel@tonic-gate if(!*pval) return -1; 114*0Sstevel@tonic-gate bn = (BIGNUM *)*pval; 115*0Sstevel@tonic-gate /* If MSB set in an octet we need a padding byte */ 116*0Sstevel@tonic-gate if(BN_num_bits(bn) & 0x7) pad = 0; 117*0Sstevel@tonic-gate else pad = 1; 118*0Sstevel@tonic-gate if(cont) { 119*0Sstevel@tonic-gate if(pad) *cont++ = 0; 120*0Sstevel@tonic-gate BN_bn2bin(bn, cont); 121*0Sstevel@tonic-gate } 122*0Sstevel@tonic-gate return pad + BN_num_bytes(bn); 123*0Sstevel@tonic-gate } 124*0Sstevel@tonic-gate 125*0Sstevel@tonic-gate static int bn_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it) 126*0Sstevel@tonic-gate { 127*0Sstevel@tonic-gate BIGNUM *bn; 128*0Sstevel@tonic-gate if(!*pval) bn_new(pval, it); 129*0Sstevel@tonic-gate bn = (BIGNUM *)*pval; 130*0Sstevel@tonic-gate if(!BN_bin2bn(cont, len, bn)) { 131*0Sstevel@tonic-gate bn_free(pval, it); 132*0Sstevel@tonic-gate return 0; 133*0Sstevel@tonic-gate } 134*0Sstevel@tonic-gate return 1; 135*0Sstevel@tonic-gate } 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate 138