From d02b48c63a58ea4367a0e905979f140b7d090f86 Mon Sep 17 00:00:00 2001 From: "Ralf S. Engelschall" Date: Mon, 21 Dec 1998 10:52:47 +0000 Subject: Import of old SSLeay release: SSLeay 0.8.1b --- crypto/dh/dh_key.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 crypto/dh/dh_key.c (limited to 'crypto/dh/dh_key.c') diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c new file mode 100644 index 0000000000..12f47c4574 --- /dev/null +++ b/crypto/dh/dh_key.c @@ -0,0 +1,142 @@ +/* crypto/dh/dh_key.c */ +/* Copyright (C) 1995-1997 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 +#include "cryptlib.h" +#include "bn.h" +#include "rand.h" +#include "dh.h" + +int DH_generate_key(dh) +DH *dh; + { + int ok=0; + unsigned int i; + BN_CTX *ctx=NULL; + BIGNUM *pub_key=NULL,*priv_key=NULL; + + ctx=BN_CTX_new(); + if (ctx == NULL) goto err; + + if (dh->priv_key == NULL) + { + i=dh->length; + if (i == 0) + { + /* Make the number p-1 bits long */ + i=BN_num_bits(dh->p)-1; + } + priv_key=BN_new(); + if (priv_key == NULL) goto err; + if (!BN_rand(priv_key,i,0,0)) goto err; + } + else + priv_key=dh->priv_key; + + if (dh->pub_key == NULL) + { + pub_key=BN_new(); + if (pub_key == NULL) goto err; + } + else + pub_key=dh->pub_key; + + if (!BN_mod_exp(pub_key,dh->g,priv_key,dh->p,ctx)) goto err; + + dh->pub_key=pub_key; + dh->priv_key=priv_key; + ok=1; +err: + if (ok != 1) + DHerr(DH_F_DH_GENERATE_KEY,ERR_R_BN_LIB); + + if ((pub_key != NULL) && (dh->pub_key == NULL)) BN_free(pub_key); + if ((priv_key != NULL) && (dh->priv_key == NULL)) BN_free(priv_key); + if (ctx != NULL) BN_CTX_free(ctx); + return(ok); + } + +int DH_compute_key(key,pub_key,dh) +unsigned char *key; +BIGNUM *pub_key; +DH *dh; + { + BN_CTX *ctx; + BIGNUM *tmp; + int ret= -1; + + ctx=BN_CTX_new(); + if (ctx == NULL) goto err; + tmp=ctx->bn[ctx->tos++]; + + if (dh->priv_key == NULL) + { + DHerr(DH_F_DH_COMPUTE_KEY,DH_R_NO_PRIVATE_VALUE); + goto err; + } + if (!BN_mod_exp(tmp,pub_key,dh->priv_key,dh->p,ctx)) + { + DHerr(DH_F_DH_COMPUTE_KEY,ERR_R_BN_LIB); + goto err; + } + + ret=BN_bn2bin(tmp,key); +err: + if (ctx != NULL) BN_CTX_free(ctx); + return(ret); + } -- cgit v1.2.3