| /* |
| * Copyright 2002 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.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" |
| |
| /* Typedefs for runtime linking. */ |
| typedef BOOL (WINAPI *CryptAcquireContextType)(HCRYPTPROV*, LPCTSTR, LPCTSTR, DWORD, DWORD); |
| typedef BOOL (WINAPI *CryptGenRandomType)(HCRYPTPROV, DWORD, BYTE*); |
| typedef BOOL (WINAPI *CryptReleaseContextType)(HCRYPTPROV, DWORD); |
| |
| /* |
| * 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) |
| { |
| HMODULE lib; |
| CryptAcquireContextType acquireContext; |
| CryptGenRandomType genRandom; |
| CryptReleaseContextType releaseContext; |
| |
| HCRYPTPROV hCryptProv; |
| jboolean result = JNI_FALSE; |
| jsize numBytes; |
| jbyte* randBytes; |
| |
| lib = LoadLibrary("ADVAPI32.DLL"); |
| if (lib == NULL) { |
| return result; |
| } |
| |
| acquireContext = (CryptAcquireContextType)GetProcAddress(lib, "CryptAcquireContextA"); |
| genRandom = (CryptGenRandomType)GetProcAddress(lib, "CryptGenRandom"); |
| releaseContext = (CryptReleaseContextType)GetProcAddress(lib, "CryptReleaseContext"); |
| |
| if (acquireContext == NULL || genRandom == NULL || releaseContext == NULL) { |
| FreeLibrary(lib); |
| return result; |
| } |
| |
| if (acquireContext(&hCryptProv, "J2SE", NULL, PROV_RSA_FULL, 0) == FALSE) { |
| /* If CSP context hasn't been created, create one. */ |
| if (acquireContext(&hCryptProv, "J2SE", NULL, PROV_RSA_FULL, |
| CRYPT_NEWKEYSET) == FALSE) { |
| FreeLibrary(lib); |
| return result; |
| } |
| } |
| |
| numBytes = (*env)->GetArrayLength(env, randArray); |
| randBytes = (*env)->GetByteArrayElements(env, randArray, NULL); |
| if (genRandom(hCryptProv, numBytes, randBytes)) { |
| result = JNI_TRUE; |
| } |
| (*env)->ReleaseByteArrayElements(env, randArray, randBytes, 0); |
| |
| releaseContext(hCryptProv, 0); |
| FreeLibrary(lib); |
| |
| return result; |
| } |