/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape Security Services for Java.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * NSS and NSPR header files
 */

#include <pk11func.h>
#include <nspr.h>

/*
 * JNI header files
 */

#include "_jni/org_mozilla_jss_pkcs11_PK11SecureRandom.h"

/*
 * JSS header files
 */

#include <jssutil.h>

/*
 * JNI FUNCTION:  PK11SecureRandom.setSeed
 *
 * JNI FUNCTION TYPE:  protected
 *
 * JNI INPUTS:
 *
 *    env
 *        The JNI object through which all JNI functions are referenced
 *
 *    this
 *        A JNI reference to the class which defines this native method
 *
 * INPUTS:
 *
 *    N/A
 *
 * OUTPUTS:
 *
 *    jseed
 *        A JNI array for storage of the random byte seed sequence
 *
 * ERRORS:
 *
 *    N/A
 *
 * RETURN:
 *
 *    Upon success, this method returns a byte array
 *    containing a random byte sequence
 *
 * NOTES:
 *
 *    This routine is called to seed the pseudo-random number generator.
 *
 * JNI NOTES:
 *
 *    Class:     org_mozilla_jss_pkcs11_PK11SecureRandom
 *    Method:    setSeed
 *    Signature: ([B)V
 */

JNIEXPORT void JNICALL
Java_org_mozilla_jss_pkcs11_PK11SecureRandom_setSeed
    ( JNIEnv* env, jobject this, jbyteArray jseed )
{
    /*
     * "JNI" data members
     */

    jbyte*    jdata   = NULL;
    jboolean  jIsCopy = JNI_FALSE;
    jsize     jlen    = 0;


    /*
     * "C" data members
     */

    PRThread*     pThread = NULL;
    SECStatus     status  = PR_FALSE;
    PK11SlotInfo* slot    = NULL;


    /*
     * Perform initial assertions
     */

    PR_ASSERT( env != NULL && this != NULL );


    /*
     * Attach to the external java thread
     */

    pThread = PR_AttachThread( PR_SYSTEM_THREAD, 0, NULL );
    PR_ASSERT( pThread != NULL );


    /*
     * Obtain the appropriate "slot"
     */

    slot = PK11_GetBestSlot( CKM_FAKE_RANDOM, NULL );
    if( slot == NULL ) {
        PR_ASSERT( PR_FALSE );
        goto loser;
    }


    /*
     * Convert "JNI jbyteArray" into "JNI jbyte*" so
     * that it can be cast into a "C unsigned char*"
     */

    jdata = ( *env )->GetByteArrayElements( env, jseed, &jIsCopy );


    /*
     * Retrieve the length of the "JNI jbyteArray"
     * so that it can be cast into a "C int"
     */

    jlen = ( *env )->GetArrayLength( env, jseed );


    /*
     * Seed the pseudo-random number generator;
     * currently, failures from this routine are ignored
     */

    status = PK11_SeedRandom( slot, ( unsigned char* ) jdata, ( int ) jlen );
    if( status != SECSuccess ) {
        PR_ASSERT( PR_FALSE );
        goto loser;
    }


loser:

    /*
     * Copy back the contents of the "JNI jbyte*" and
     * free any resources associated with it
     */

    if(  jIsCopy == JNI_TRUE ) {
        ( *env )->ReleaseByteArrayElements( env, jseed, jdata, 0 );
    }


    /*
     * Free any "C" resources
     */

    if( slot != NULL ) {
        PK11_FreeSlot( slot );
    }
    slot = NULL;


    /*
     * Detach from the external java thread and return
     */

    PR_DetachThread();

    return;
}


/*
 * JNI FUNCTION:  PK11SecureRandom.nextBytes
 *
 * JNI FUNCTION TYPE:  protected
 *
 * JNI INPUTS:
 *
 *    env
 *        The JNI object through which all JNI functions are referenced
 *
 *    this
 *        A JNI reference to the class which defines this native method
 *
 * INPUTS:
 *
 *    N/A
 *
 * OUTPUTS:
 *
 *    jbytes
 *        A JNI array for storage of the random byte sequence
 *
 * ERRORS:
 *
 *    N/A
 *
 * RETURN:
 *
 *    Upon success, this method returns a byte array
 *    containing a random byte sequence
 *
 * NOTES:
 *
 *    This routine is called to generate a pseudo-random number.
 *
 * JNI NOTES:
 *
 *    Class:     org_mozilla_jss_pkcs11_PK11SecureRandom
 *    Method:    nextBytes
 *    Signature: ([B)V
 */

JNIEXPORT void JNICALL
Java_org_mozilla_jss_pkcs11_PK11SecureRandom_nextBytes
    ( JNIEnv* env, jobject this, jbyteArray jbytes )
{
    /*
     * "JNI" data members
     */

    jbyte*    jdata   = NULL;
    jboolean  jIsCopy = JNI_FALSE;
    jsize     jlen    = 0;


    /*
     * "C" data members
     */

    PRThread*     pThread = NULL;
    SECStatus     status  = PR_FALSE;


    /*
     * Perform initial assertions
     */

    PR_ASSERT( env != NULL && this != NULL );


    /*
     * Attach to the external java thread
     */

    pThread = PR_AttachThread( PR_SYSTEM_THREAD, 0, NULL );
    PR_ASSERT( pThread != NULL );


    /*
     * Convert "JNI jbyteArray" into "JNI jbyte*" so
     * that it can be cast into a "C unsigned char*"
     */

    jdata = ( *env )->GetByteArrayElements( env, jbytes, &jIsCopy );


    /*
     * Retrieve the length of the "JNI jbyteArray"
     * so that it can be cast into a "C int"
     */

    jlen = ( *env )->GetArrayLength( env, jbytes );


    /*
     * Generate a pseudo-random number; currently,
     * failures from this routine are ignored
     */

    status = PK11_GenerateRandom( ( unsigned char* ) jdata, ( int ) jlen );
    if( status != SECSuccess ) {
        goto loser;
    }


loser:

    /*
     * Copy back the contents of the "JNI jbyte*" and
     * free any resources associated with it
     */

    if( jIsCopy == JNI_TRUE ) {
        ( *env )->ReleaseByteArrayElements( env, jbytes, jdata, 0 );
    }


    /*
     * Detach from the external java thread and return
     */

    PR_DetachThread();

    return;
}

