/* x_bignum.c */ /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project 2000. */ /* ==================================================================== * Copyright (c) 2000 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include <stdio.h> #include "cryptlib.h" #include <openssl/asn1t.h> #include <openssl/bn.h> /* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a * BIGNUM directly. Currently it ignores the sign which isn't a problem since all * BIGNUMs used are non negative and anything that looks negative is normally due * to an encoding error. */ #define BN_SENSITIVE 1 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it); static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it); static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); static ASN1_PRIMITIVE_FUNCS bignum_pf = { NULL, 0, bn_new, bn_free, 0, bn_c2i, bn_i2c }; ASN1_ITEM_start(BIGNUM) ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM" ASN1_ITEM_end(BIGNUM) ASN1_ITEM_start(CBIGNUM) ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM" ASN1_ITEM_end(CBIGNUM) static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it) { *pval = (ASN1_VALUE *)BN_new(); if(*pval) return 1; else return 0; } static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it) { if(!*pval) return; if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval); else BN_free((BIGNUM *)*pval); *pval = NULL; } static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it) { BIGNUM *bn; int pad; if(!*pval) return -1; bn = (BIGNUM *)*pval; /* If MSB set in an octet we need a padding byte */ if(BN_num_bits(bn) & 0x7) pad = 0; else pad = 1; if(cont) { if(pad) *cont++ = 0; BN_bn2bin(bn, cont); } return pad + BN_num_bytes(bn); } static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it) { BIGNUM *bn; if(!*pval) bn_new(pval, it); bn = (BIGNUM *)*pval; if(!BN_bin2bn(cont, len, bn)) { bn_free(pval, it); return 0; } return 1; }