path: root/drivers/s390/crypto/zcrypt_pcixcc.c

/*
 *  linux/drivers/s390/crypto/zcrypt_pcixcc.c
 *
 *  zcrypt 2.1.0
 *
 *  Copyright (C)  2001, 2006 IBM Corporation
 *  Author(s): Robert Burroughs
 *	       Eric Rossman (edrossma@us.ibm.com)
 *
 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
 *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>

#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_error.h"
#include "zcrypt_pcicc.h"
#include "zcrypt_pcixcc.h"
#include "zcrypt_cca_key.h"

#define PCIXCC_MIN_MOD_SIZE	 16	/*  128 bits	*/
#define PCIXCC_MIN_MOD_SIZE_OLD	 64	/*  512 bits	*/
#define PCIXCC_MAX_MOD_SIZE	256	/* 2048 bits	*/

#define PCIXCC_MCL2_SPEED_RATING	7870	/* FIXME: needs finetuning */
#define PCIXCC_MCL3_SPEED_RATING	7870
#define CEX2C_SPEED_RATING		8540

#define PCIXCC_MAX_ICA_MESSAGE_SIZE 0x77c  /* max size type6 v2 crt message */
#define PCIXCC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply	    */

#define PCIXCC_MAX_XCRB_MESSAGE_SIZE (12*1024)
#define PCIXCC_MAX_XCRB_RESPONSE_SIZE PCIXCC_MAX_XCRB_MESSAGE_SIZE
#define PCIXCC_MAX_XCRB_DATA_SIZE (11*1024)
#define PCIXCC_MAX_XCRB_REPLY_SIZE (5*1024)

#define PCIXCC_MAX_RESPONSE_SIZE PCIXCC_MAX_XCRB_RESPONSE_SIZE

#define PCIXCC_CLEANUP_TIME	(15*HZ)

#define CEIL4(x) ((((x)+3)/4)*4)

struct response_type {
	struct completion work;
	int type;
};
#define PCIXCC_RESPONSE_TYPE_ICA  0
#define PCIXCC_RESPONSE_TYPE_XCRB 1

static struct ap_device_id zcrypt_pcixcc_ids[] = {
	{ AP_DEVICE(AP_DEVICE_TYPE_PCIXCC) },
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2C) },
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2C2) },
	{ /* end of list */ },
};

#ifndef CONFIG_ZCRYPT_MONOLITHIC
MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_ids);
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("PCIXCC Cryptographic Coprocessor device driver, "
		   "Copyright 2001, 2006 IBM Corporation");
MODULE_LICENSE("GPL");
#endif

static int zcrypt_pcixcc_probe(struct ap_device *ap_dev);
static void zcrypt_pcixcc_remove(struct ap_device *ap_dev);
static void zcrypt_pcixcc_receive(struct ap_device *, struct ap_message *,
				 struct ap_message *);

static struct ap_driver zcrypt_pcixcc_driver = {
	.probe = zcrypt_pcixcc_probe,
	.remove = zcrypt_pcixcc_remove,
	.receive = zcrypt_pcixcc_receive,
	.ids = zcrypt_pcixcc_ids,
	.request_timeout = PCIXCC_CLEANUP_TIME,
};

/**
 * The following is used to initialize the CPRBX passed to the PCIXCC/CEX2C
 * card in a type6 message. The 3 fields that must be filled in at execution
 * time are  req_parml, rpl_parml and usage_domain.
 * Everything about this interface is ascii/big-endian, since the
 * device does *not* have 'Intel inside'.
 *
 * The CPRBX is followed immediately by the parm block.
 * The parm block contains:
 * - function code ('PD' 0x5044 or 'PK' 0x504B)
 * - rule block (one of:)
 *   + 0x000A 'PKCS-1.2' (MCL2 'PD')
 *   + 0x000A 'ZERO-PAD' (MCL2 'PK')
 *   + 0x000A 'ZERO-PAD' (MCL3 'PD' or CEX2C 'PD')
 *   + 0x000A 'MRP     ' (MCL3 'PK' or CEX2C 'PK')
 * - VUD block
 */
static struct CPRBX static_cprbx = {
	.cprb_len	=  0x00DC,
	.cprb_ver_id	=  0x02,
	.func_id	= {0x54,0x32},
};

/**
 * Convert a ICAMEX message to a type6 MEX message.
 *
 * @zdev: crypto device pointer
 * @ap_msg: pointer to AP message
 * @mex: pointer to user input data
 *
 * Returns 0 on success or -EFAULT.
 */
static int ICAMEX_msg_to_type6MEX_msgX(struct zcrypt_device *zdev,
				       struct ap_message *ap_msg,
				       struct ica_rsa_modexpo *mex)
{
	static struct type6_hdr static_type6_hdrX = {
		.type		=  0x06,
		.offset1	=  0x00000058,
		.agent_id	= {'C','A',},
		.function_code	= {'P','K'},
	};
	static struct function_and_rules_block static_pke_fnr = {
		.function_code	= {'P','K'},
		.ulen		= 10,
		.only_rule	= {'M','R','P',' ',' ',' ',' ',' '}
	};
	static struct function_and_rules_block static_pke_fnr_MCL2 = {
		.function_code	= {'P','K'},
		.ulen		= 10,
		.only_rule	= {'Z','E','R','O','-','P','A','D'}
	};
	struct {
		struct type6_hdr hdr;
		struct CPRBX cprbx;
		struct function_and_rules_block fr;
		unsigned short length;
		char text[0];
	} __attribute__((packed)) *msg = ap_msg->message;
	int size;

	/* VUD.ciphertext */<