/* ====================================================================
 * Copyright (c) 1998-2008 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

/* Copyright (C) 1995-1998 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 <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>
#include <sys/time.h>
#include <string.h>

#ifdef USE_HSM
#include "cr_hsm_code.h"
#endif // USE_HSM

#include "cr_generate_id.h"
#include "cr_generate_id_private.h"

typedef struct
{
	u8 stop;
	u8 position;
	u8 emptySize;
	u8 stack[ CALL_STACK_SIZE ];
}
errorInfoStruct;

static errorInfoStruct errorInfo;

// タイムスタンプを取得してセット
int GetTimestamp( u8 *pYear, u8 *pMonth, u8 *pMday, u8 *pHour, u8 *pMin, u8 *pSec, time_t *pTime)
{
	int ret_code = CR_GENID_SUCCESS;
	struct tm *tm_time;
	struct timeval tv;

#ifdef USE_HSM
	ret_code = hsm_get_rtc( &tv.tv_sec );
	if( ret_code != CR_GENID_SUCCESS ) {
		SetErrorInfo( __FUNCTION__, __LINE__ );
		return ret_code;
	}
#else // !USE_HSM
	gettimeofday( &tv, NULL );
#endif // USE_HSM

	tm_time = gmtime( &tv.tv_sec );

	*pYear  = (u8)tm_time->tm_year;
	*pMonth = (u8)tm_time->tm_mon + 1;
	*pMday  = (u8)tm_time->tm_mday;
	*pHour  = (u8)tm_time->tm_hour;
	*pMin   = (u8)tm_time->tm_min;
	*pSec   = (u8)tm_time->tm_sec;
	*pTime  = tv.tv_sec;

#if 0
	{
		struct tm tm2;
		time_t t2;
		memset( &tm2, 0, sizeof(tm2) );
		tm2.tm_year  = *pYear;
		tm2.tm_mon   = *pMonth - 1;
		tm2.tm_mday  = *pMday;
		tm2.tm_hour  = *pHour;
		tm2.tm_min   = *pMin;
		tm2.tm_sec   = *pSec;
		tm2.tm_isdst = 0;		// 夏時間　ここでは0（無効）にする。
		t2 = gmt_mktime( &tm2 );
		printf( "time_t = %08x\n", (int)t  );
		printf( "mktime = %08x\n", (int)t2 );
	}
#endif

#ifdef DEBUG_PRINT
	if( cr_print_flag ) {
		printf("GMT:%d-%02d-%02d %02d:%02d:%02d\n",
				*pYear+1900,
				*pMonth,
				*pMday,
				*pHour,
				*pMin,
				*pSec
				);
	}
#endif /* DEBUG_PRINT */

	return ret_code;
}

#if 0
static time_t gmt_mktime( struct tm *tm_time )
{
    time_t ret;
    char *tz;

    tz = getenv("TZ");
    setenv("TZ", "", 1);	// setenv, unsetenv はcygwinでは見つからない
    tzset();
    ret = mktime(tm_time);	// mktime は、localtimeでの変換になるため、timezoneの処理が必要
    if (tz)
        setenv("TZ", tz, 1);
    else
        unsetenv("TZ");
    tzset();
    return ret;
}
#endif


// 乱数を生成してセット
int GenerateRandom( u8 *pDst, int length )
{
	int ret_code = CR_GENID_SUCCESS;
	
#ifdef USE_HSM
	ret_code = hsm_generate_random( pDst, CR_RANDOM_LENGTH );
	if ( ret_code != CR_GENID_SUCCESS )
	{
		SetErrorInfo( __FUNCTION__, __LINE__ );
	}
#else // !USE_HSM
	int i;
	for( i = 0 ; i < length; i++ ) {
		*pDst++ = (u8)rand();
	}
#endif // USE_HSM

	return ret_code;
}

void InitErrorInfo( void )
{
	memset( &errorInfo, 0, sizeof( errorInfo ) );
	errorInfo.emptySize = CALL_STACK_SIZE;
}	// InitErrorInfo

// エラー情報の記録
void SetErrorInfo( const char *funcName, u32 line )
{
	if ( !errorInfo.stop )
	{
		int len;
		char str[64];
		
		sprintf( str, "%s:%d ", funcName, (int)line );
		len = strlen( str );
		
		if ( len > errorInfo.emptySize )
		{
			errorInfo.stop = 1;
			return;
		}
		
		memcpy( &errorInfo.stack[ errorInfo.position ], str, len );
		errorInfo.position += len;
		errorInfo.emptySize -= len;
	}
#if 0
	else
	{
		printf( "Stack is full!\n" );
	}
#endif	
}	// StoreErrorInfo

// エラー情報の取得
void GetErrorInfo( char *stack, u8 *size )
{
	memcpy( stack, errorInfo.stack, CALL_STACK_SIZE );
	*size = CALL_STACK_SIZE - errorInfo.emptySize;
}	// GetErrorInfo