1656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* x_bignum.c */ 2e45f106cb6b47af1f21efe76e933bdea2f5dd1caNagendra Modadugu/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * project 2000. 4656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 5656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* ==================================================================== 6656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 7656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 8656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Redistribution and use in source and binary forms, with or without 9656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * modification, are permitted provided that the following conditions 10656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * are met: 11656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 12656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 1. Redistributions of source code must retain the above copyright 13656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer. 14656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 15656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 16656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer in 17656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the documentation and/or other materials provided with the 18656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * distribution. 19656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 20656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 3. All advertising materials mentioning features or use of this 21656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * software must display the following acknowledgment: 22656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 23656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 25656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * endorse or promote products derived from this software without 27656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * prior written permission. For written permission, please contact 28656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * licensing@OpenSSL.org. 29656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 30656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 5. Products derived from this software may not be called "OpenSSL" 31656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * nor may "OpenSSL" appear in their names without prior written 32656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * permission of the OpenSSL Project. 33656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 34656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 6. Redistributions of any form whatsoever must retain the following 35656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * acknowledgment: 36656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 37656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 39656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OF THE POSSIBILITY OF SUCH DAMAGE. 51656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ==================================================================== 52656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 53656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This product includes cryptographic software written by Eric Young 54656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * (eay@cryptsoft.com). This product includes software written by Tim 55656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Hudson (tjh@cryptsoft.com). 56656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 57656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 58656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 59656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <stdio.h> 60656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "cryptlib.h" 61656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/asn1t.h> 62656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/bn.h> 63656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 64656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a 65656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * BIGNUM directly. Currently it ignores the sign which isn't a problem since all 66656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * BIGNUMs used are non negative and anything that looks negative is normally due 67656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * to an encoding error. 68656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 69656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 70656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#define BN_SENSITIVE 1 71656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 72656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it); 73656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it); 74656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 75656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); 76656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); 77656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 78656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic ASN1_PRIMITIVE_FUNCS bignum_pf = { 79656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project NULL, 0, 80656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_new, 81656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_free, 82656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 0, 83656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_c2i, 84656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_i2c 85656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project}; 86656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 87656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectASN1_ITEM_start(BIGNUM) 88656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM" 89656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectASN1_ITEM_end(BIGNUM) 90656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 91656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectASN1_ITEM_start(CBIGNUM) 92656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM" 93656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectASN1_ITEM_end(CBIGNUM) 94656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 95656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 96656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project{ 97656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project *pval = (ASN1_VALUE *)BN_new(); 98656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(*pval) return 1; 99656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else return 0; 100656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project} 101656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 102656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 103656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project{ 104656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(!*pval) return; 105656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval); 106656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else BN_free((BIGNUM *)*pval); 107656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project *pval = NULL; 108656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project} 109656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 110656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it) 111656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project{ 112656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BIGNUM *bn; 113656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int pad; 114656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(!*pval) return -1; 115656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn = (BIGNUM *)*pval; 116656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* If MSB set in an octet we need a padding byte */ 117656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(BN_num_bits(bn) & 0x7) pad = 0; 118656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else pad = 1; 119656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(cont) { 120656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(pad) *cont++ = 0; 121656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_bn2bin(bn, cont); 122656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 123656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return pad + BN_num_bytes(bn); 124656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project} 125656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 126656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, 127656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int utype, char *free_cont, const ASN1_ITEM *it) 128656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project{ 129656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BIGNUM *bn; 130656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(!*pval) bn_new(pval, it); 131656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn = (BIGNUM *)*pval; 132656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(!BN_bin2bn(cont, len, bn)) { 133656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_free(pval, it); 134656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return 0; 135656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 136656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return 1; 137656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project} 138656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 139656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 140