diff options
Diffstat (limited to 'openssl/crypto/dh/dh_asn1.c')
| -rw-r--r-- | openssl/crypto/dh/dh_asn1.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/openssl/crypto/dh/dh_asn1.c b/openssl/crypto/dh/dh_asn1.c new file mode 100644 index 0000000..f470214 --- /dev/null +++ b/openssl/crypto/dh/dh_asn1.c @@ -0,0 +1,189 @@ +/* dh_asn1.c */ +/* + * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project + * 2000. + */ +/* ==================================================================== + * Copyright (c) 2000-2005 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/bn.h> +#include <openssl/dh.h> +#include <openssl/objects.h> +#include <openssl/asn1t.h> + +/* Override the default free and new methods */ +static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, + void *exarg) +{ + if (operation == ASN1_OP_NEW_PRE) { + *pval = (ASN1_VALUE *)DH_new(); + if (*pval) + return 2; + return 0; + } else if (operation == ASN1_OP_FREE_PRE) { + DH_free((DH *)*pval); + *pval = NULL; + return 2; + } + return 1; +} + +ASN1_SEQUENCE_cb(DHparams, dh_cb) = { + ASN1_SIMPLE(DH, p, BIGNUM), + ASN1_SIMPLE(DH, g, BIGNUM), + ASN1_OPT(DH, length, ZLONG), +} ASN1_SEQUENCE_END_cb(DH, DHparams) + +IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams) + +/* + * Internal only structures for handling X9.42 DH: this gets translated to or + * from a DH structure straight away. + */ + +typedef struct { + ASN1_BIT_STRING *seed; + BIGNUM *counter; +} int_dhvparams; + +typedef struct { + BIGNUM *p; + BIGNUM *q; + BIGNUM *g; + BIGNUM *j; + int_dhvparams *vparams; +} int_dhx942_dh; + +ASN1_SEQUENCE(DHvparams) = { + ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING), + ASN1_SIMPLE(int_dhvparams, counter, BIGNUM) +} ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams) + +ASN1_SEQUENCE(DHxparams) = { + ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM), + ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM), + ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM), + ASN1_OPT(int_dhx942_dh, j, BIGNUM), + ASN1_OPT(int_dhx942_dh, vparams, DHvparams), +} ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams) + +int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a, + const unsigned char **pp, long length); +int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp); + +IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx) + +/* Application leve function: read in X9.42 DH parameters into DH structure */ + +DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length) +{ + int_dhx942_dh *dhx = NULL; + DH *dh = NULL; + dh = DH_new(); + if (!dh) + return NULL; + dhx = d2i_int_dhx(NULL, pp, length); + if (!dhx) { + DH_free(dh); + return NULL; + } + + if (a) { + if (*a) + DH_free(*a); + *a = dh; + } + + dh->p = dhx->p; + dh->q = dhx->q; + dh->g = dhx->g; + dh->j = dhx->j; + + if (dhx->vparams) { + dh->seed = dhx->vparams->seed->data; + dh->seedlen = dhx->vparams->seed->length; + dh->counter = dhx->vparams->counter; + dhx->vparams->seed->data = NULL; + ASN1_BIT_STRING_free(dhx->vparams->seed); + OPENSSL_free(dhx->vparams); + dhx->vparams = NULL; + } + + OPENSSL_free(dhx); + return dh; +} + +int i2d_DHxparams(const DH *dh, unsigned char **pp) +{ + int_dhx942_dh dhx; + int_dhvparams dhv; + ASN1_BIT_STRING bs; + dhx.p = dh->p; + dhx.g = dh->g; + dhx.q = dh->q; + dhx.j = dh->j; + if (dh->counter && dh->seed && dh->seedlen > 0) { + bs.flags = ASN1_STRING_FLAG_BITS_LEFT; + bs.data = dh->seed; + bs.length = dh->seedlen; + dhv.seed = &bs; + dhv.counter = dh->counter; + dhx.vparams = &dhv; + } else + dhx.vparams = NULL; + + return i2d_int_dhx(&dhx, pp); +} |