| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * 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 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 acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS 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 AUTHOR OR 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. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] */ |
| |
| #include <openssl/asn1.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; |
| } |