| /* 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 <openssl/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| #include <stdio.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| #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 == NULL && !bn_new(pval, it)) |
| return 0; |
| bn = (BIGNUM *)*pval; |
| if (!BN_bin2bn(cont, len, bn)) { |
| bn_free(pval, it); |
| return 0; |
| } |
| return 1; |
| } |