Import of old SSLeay release: SSLeay 0.8.1b

1 files changed, 142 insertions, 0 deletions

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 <stdio.h>
+#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);
+	}