diff options
Diffstat (limited to 'openssl/crypto/asn1/x_bignum.c')
| -rw-r--r-- | openssl/crypto/asn1/x_bignum.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/openssl/crypto/asn1/x_bignum.c b/openssl/crypto/asn1/x_bignum.c new file mode 100644 index 00000000..9cf3204a --- /dev/null +++ b/openssl/crypto/asn1/x_bignum.c @@ -0,0 +1,139 @@ +/* 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 <stdio.h> +#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) bn_new(pval, it); + bn = (BIGNUM *)*pval; + if(!BN_bin2bn(cont, len, bn)) { + bn_free(pval, it); + return 0; + } + return 1; +} + + |