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- /* 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 const 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)
- {
- if (!bn_new(pval, it))
- {
- return 0;
- }
- }
- bn = (BIGNUM *)*pval;
- if(!BN_bin2bn(cont, len, bn)) {
- bn_free(pval, it);
- return 0;
- }
- return 1;
- }
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