/*
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* Need to define this to get CAPI functions included */
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0400
#endif
#include <windows.h>
#include <wincrypt.h>
#include <jni.h>
#include "sun_security_provider_NativeSeedGenerator.h"
/*
* Get a random seed from the MS CryptoAPI. Return true if successful, false
* otherwise.
*
* Some early versions of Windows 95 do not support the required functions.
* Use runtime linking to avoid problems.
*
*/
JNIEXPORT jboolean JNICALL Java_sun_security_provider_NativeSeedGenerator_nativeGenerateSeed
(JNIEnv *env, jclass clazz, jbyteArray randArray)
{
HCRYPTPROV hCryptProv;
jboolean result = JNI_FALSE;
jsize numBytes;
jbyte* randBytes;
if (CryptAcquireContextA(&hCryptProv, "J2SE", NULL, PROV_RSA_FULL, 0) == FALSE) {
/* If CSP context hasn't been created, create one. */
if (CryptAcquireContextA(&hCryptProv, "J2SE", NULL, PROV_RSA_FULL,
CRYPT_NEWKEYSET) == FALSE) {
return result;
}
}
numBytes = (*env)->GetArrayLength(env, randArray);
randBytes = (*env)->GetByteArrayElements(env, randArray, NULL);
if (CryptGenRandom(hCryptProv, numBytes, randBytes)) {
result = JNI_TRUE;
}
(*env)->ReleaseByteArrayElements(env, randArray, randBytes, 0);
CryptReleaseContext(hCryptProv, 0);
return result;
}