/* $OpenBSD: x_bignum.c,v 1.8 2015/07/25 17:07:17 jsing Exp $ */ /* 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 #include #include /* * 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. */ 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 }; const ASN1_ITEM BIGNUM_it = { .itype = ASN1_ITYPE_PRIMITIVE, .utype = V_ASN1_INTEGER, .templates = NULL, .tcount = 0, .funcs = &bignum_pf, .size = 0, .sname = "BIGNUM", }; const ASN1_ITEM CBIGNUM_it = { .itype = ASN1_ITYPE_PRIMITIVE, .utype = V_ASN1_INTEGER, .templates = NULL, .tcount = 0, .funcs = &bignum_pf, .size = 0, .sname = "BIGNUM", }; 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 == NULL) return; BN_clear_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, len; if (*pval == NULL) 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; len = BN_bn2bin(bn, cont); } else len = BN_num_bytes(bn); return pad + len; } 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 == NULL) { if (bn_new(pval, it) == 0) return 0; } bn = (BIGNUM *)*pval; if (!BN_bin2bn(cont, len, bn)) { bn_free(pval, it); return 0; } return 1; }