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Diffstat (limited to 'src/crypto/asn1/x_bignum.c')
| -rw-r--r-- | src/crypto/asn1/x_bignum.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/src/crypto/asn1/x_bignum.c b/src/crypto/asn1/x_bignum.c new file mode 100644 index 0000000..f8c62fd --- /dev/null +++ b/src/crypto/asn1/x_bignum.c @@ -0,0 +1,142 @@ +/* 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; +} |