/* 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 <openssl_grpc/dh.h> #include <assert.h> #include <limits.h> #include <openssl_grpc/bn.h> #include <openssl_grpc/bytestring.h> #include <openssl_grpc/err.h> #include "../bytestring/internal.h" static int parse_integer(CBS *cbs, BIGNUM **out) { assert(*out == NULL); *out = BN_new(); if (*out == NULL) { return 0; } return BN_parse_asn1_unsigned(cbs, *out); } static int marshal_integer(CBB *cbb, BIGNUM *bn) { if (bn == NULL) { // A DH object may be missing some components. OPENSSL_PUT_ERROR(DH, ERR_R_PASSED_NULL_PARAMETER); return 0; } return BN_marshal_asn1(cbb, bn); } DH *DH_parse_parameters(CBS *cbs) { DH *ret = DH_new(); if (ret == NULL) { return NULL; } CBS child; if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) || !parse_integer(&child, &ret->p) || !parse_integer(&child, &ret->g)) { goto err; } uint64_t priv_length; if (CBS_len(&child) != 0) { if (!CBS_get_asn1_uint64(&child, &priv_length) || priv_length > UINT_MAX) { goto err; } ret->priv_length = (unsigned)priv_length; } if (CBS_len(&child) != 0) { goto err; } return ret; err: OPENSSL_PUT_ERROR(DH, DH_R_DECODE_ERROR); DH_free(ret); return NULL; } int DH_marshal_parameters(CBB *cbb, const DH *dh) { CBB child; if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) || !marshal_integer(&child, dh->p) || !marshal_integer(&child, dh->g) || (dh->priv_length != 0 && !CBB_add_asn1_uint64(&child, dh->priv_length)) || !CBB_flush(cbb)) { OPENSSL_PUT_ERROR(DH, DH_R_ENCODE_ERROR); return 0; } return 1; } DH *d2i_DHparams(DH **out, const uint8_t **inp, long len) { if (len < 0) { return NULL; } CBS cbs; CBS_init(&cbs, *inp, (size_t)len); DH *ret = DH_parse_parameters(&cbs); if (ret == NULL) { return NULL; } if (out != NULL) { DH_free(*out); *out = ret; } *inp = CBS_data(&cbs); return ret; } int i2d_DHparams(const DH *in, uint8_t **outp) { CBB cbb; if (!CBB_init(&cbb, 0) || !DH_marshal_parameters(&cbb, in)) { CBB_cleanup(&cbb); return -1; } return CBB_finish_i2d(&cbb, outp); }