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<pre class="sourcecodebox">/*
File: DiffieHellman.cpp
Contains: Diffie-Hellman key exchange example.
Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under Apple's
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any patent rights that
may be infringed by your derivative works or by other works in which the Apple
Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Change History (most recent first):
11/4/02 1.0d1
*/
#include <libCdsaCrypt/libCdsaCrypt.h>
#include <libCdsaCrypt/fileIo.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define DH_KEY_SIZE 512 /* size of Diffie-Hellman key in bits */
#define DERIVE_KEY_SIZE 128 /* size of derived key in bits */
#define DERIVE_KEY_ALG CSSM_ALGID_AES
static void usage(char **argv)
{
printf("usage: \n");
printf("usage: %s i=paramBlobFile uses precalculated parameters\n",
argv[0]);
printf("usage: %s o=paramBlobFile calculates and writes parameters\n",
argv[0]);
exit(1);
}
/*
* Encrypt ptext with myDeriveKey ==> ctext
* decrypt ctext with theirDeriveKey ==> rptext
* ensure ptext == rptext
*/
static int doEncryptTest(
CSSM_CSP_HANDLE cspHandle,
const CSSM_DATA *ptext,
CSSM_KEY_PTR myDeriveKey,
CSSM_KEY_PTR theirDeriveKey)
{
CSSM_DATA ctext = {0, NULL};
CSSM_DATA rptext = {0, NULL};
CSSM_RETURN crtn;
/* encrypt with our derived key */
crtn = cdsaEncrypt(cspHandle,
myDeriveKey,
ptext,
&ctext);
if(crtn) {
cssmPerror("cdsaEncrypt", crtn);
return -1;
}
/* decrypt with their derived key */
crtn = cdsaDecrypt(cspHandle,
theirDeriveKey,
&ctext,
&rptext);
if(crtn) {
cssmPerror("cdsaDecrypt", crtn);
return -1;
}
/* verify */
if((ptext->Length != rptext.Length) ||
memcmp(ptext->Data, rptext.Data, ptext->Length)) {
printf("***DATA MISCOMPARE***\n");
return -1;
}
/* free data allocated by CSP */
free(ctext.Data);
free(rptext.Data);
return 0;
}
/*
* Generate two Diffie-Hellman key pairs using the same algorithm parameters.
* Derive two symmetric keys using D-H key exchange.
* Encrypt with one symmetric key, decrypt with the other, ensure match.
*/
static int doTest(
CSSM_CSP_HANDLE cspHandle,
const CSSM_DATA *ptext,
const CSSM_DATA *inParams, // optional
CSSM_DATA_PTR outParams, // optional
uint32 keySizeInBits) // Diffie-HEllman keys
{
CSSM_KEY myPriv;
CSSM_KEY myPub;
CSSM_KEY theirPriv;
CSSM_KEY theirPub;
int rtn = 0;
CSSM_RETURN crtn;
if(outParams) {
printf("Generating Diffie-Hellman parameters and key pairs...\n");
}
else {
printf("Generating Diffie-Hellman key pairs...\n");
}
crtn = cdsaDhGenerateKeyPair(cspHandle,
&myPub,
&myPriv,
keySizeInBits,
inParams,
outParams);
if(crtn) {
cssmPerror("cdsaDhGenerateKeyPair", crtn);
return -1;
}
/*
* Note the params for the second key pair MUST match the
* params either specified or generated in previous call.
*/
if((inParams == NULL) && (outParams == NULL)) {
printf("***Must provide a way to match D-H parameters!\n");
exit(1);
}
const CSSM_DATA *theParams = inParams;
if(theParams == NULL) {
theParams = outParams;
}
crtn = cdsaDhGenerateKeyPair(cspHandle,
&theirPub,
&theirPriv,
keySizeInBits,
theParams, // inParams
NULL); // outParams
if(crtn) {
cssmPerror("cdsaDhGenerateKeyPair", crtn);
return -1;
}
/* derive two symmetric keys */
printf("Performing Diffie-Hellman key exchange...\n");
CSSM_KEY myDerive;
CSSM_KEY theirDerive;
crtn = cdsaDhKeyExchange(cspHandle,
&myPriv,
theirPub.KeyData.Data,
theirPub.KeyData.Length,
&myDerive,
DERIVE_KEY_SIZE,
DERIVE_KEY_ALG);
if(crtn) {
cssmPerror("cdsaDhKeyExchange", crtn);
return -1;
}
crtn = cdsaDhKeyExchange(cspHandle,
&theirPriv,
myPub.KeyData.Data,
myPub.KeyData.Length,
&theirDerive,
DERIVE_KEY_SIZE,
DERIVE_KEY_ALG);
if(crtn) {
cssmPerror("cdsaDhKeyExchange", crtn);
return -1;
}
/*
* Encrypt plaintext with myDerive
* decrypt with theirDerive
* verify result of decryption matches original plaintext
*/
printf("Verifying key exchange...\n");
rtn = doEncryptTest(cspHandle,
ptext,
&myDerive,
&theirDerive);
/* Free resources */
cdsaFreeKey(cspHandle, &myPub);
cdsaFreeKey(cspHandle, &myPriv);
cdsaFreeKey(cspHandle, &theirPub);
cdsaFreeKey(cspHandle, &theirPriv);
cdsaFreeKey(cspHandle, &myDerive);
cdsaFreeKey(cspHandle, &theirDerive);
return rtn;
}
int main(int argc, char **argv)
{
CSSM_CSP_HANDLE cspHandle;
CSSM_DATA inParams = {0, NULL};
CSSM_DATA outParams = {0, NULL};
CSSM_DATA_PTR inParamPtr = NULL;
CSSM_DATA_PTR outParamPtr = NULL;
CSSM_DATA ptext;
char *inFileName = NULL;
char *outFileName = NULL;
CSSM_RETURN crtn;
int irtn;
if(argc != 2) {
usage(argv);
}
switch(argv[1][0]) {
case 'i':
inFileName = &argv[1][2];
break;
case 'o':
outFileName = &argv[1][2];
break;
default:
usage(argv);
}
crtn = cdsaCspAttach(&cspHandle);
if(crtn) {
cssmPerror("Attach to CSP", crtn);
exit(1);
}
/* optionally fetch algorithm parameters from a file */
if(inFileName) {
irtn = readFile(inFileName, &inParams.Data,
(unsigned *)&inParams.Length);
if(irtn) {
printf("***Can't read parameters from %s; aborting.\n",
inFileName);
exit(1);
}
/* constant from now on */
inParamPtr = &inParams;
}
else {
/* no user-supplied parameters; generate and save in outParams */
outParamPtr = &outParams;
}
ptext.Data = (uint8 *)"Some random plaintext to carefully"
"encrypt and recover";
ptext.Length = strlen((char *)ptext.Data);
irtn = doTest(cspHandle,
&ptext,
inParamPtr,
outParamPtr,
DH_KEY_SIZE);
if(irtn == 0) {
/* test was successful */
if(outParamPtr) {
/* write generated params to file */
irtn = writeFile(outFileName, outParams.Data, outParams.Length);
if(irtn) {
printf("***Error writing params to %s.\n", outFileName);
}
else {
printf("...wrote %u bytes to %s\n",
(unsigned)outParams.Length, outFileName);
}
}
}
CSSM_ModuleDetach(cspHandle);
if(irtn == 0) {
printf("Diffie-Hellman test complete.\n");
}
else {
printf("Diffie-Hellman test failed.\n");
}
return 0;
}
</pre>
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