[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / crypto / zcrypt_msgtype50.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *  zcrypt 2.1.0
 *
 *  Copyright IBM Corp. 2001, 2012
 *  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>
 *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
 */

#define KMSG_COMPONENT "zcrypt"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

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

#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_error.h"
#include "zcrypt_msgtype50.h"

#define CEX3A_MAX_MOD_SIZE	512	/* 4096 bits	*/

#define CEX2A_MAX_RESPONSE_SIZE 0x110	/* max outputdatalength + type80_hdr */

#define CEX3A_MAX_RESPONSE_SIZE	0x210	/* 512 bit modulus
					 * (max outputdatalength) +
					 * type80_hdr*/

MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \
		   "Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL");

/**
 * The type 50 message family is associated with a CEX2A card.
 *
 * The four members of the family are described below.
 *
 * Note that all unsigned char arrays are right-justified and left-padded
 * with zeroes.
 *
 * Note that all reserved fields must be zeroes.
 */
struct type50_hdr {
	unsigned char	reserved1;
	unsigned char	msg_type_code;	/* 0x50 */
	unsigned short	msg_len;
	unsigned char	reserved2;
	unsigned char	ignored;
	unsigned short	reserved3;
} __packed;

#define TYPE50_TYPE_CODE	0x50

#define TYPE50_MEB1_FMT		0x0001
#define TYPE50_MEB2_FMT		0x0002
#define TYPE50_MEB3_FMT		0x0003
#define TYPE50_CRB1_FMT		0x0011
#define TYPE50_CRB2_FMT		0x0012
#define TYPE50_CRB3_FMT		0x0013

/* Mod-Exp, with a small modulus */
struct type50_meb1_msg {
	struct type50_hdr header;
	unsigned short	keyblock_type;	/* 0x0001 */
	unsigned char	reserved[6];
	unsigned char	exponent[128];
	unsigned char	modulus[128];
	unsigned char	message[128];
} __packed;

/* Mod-Exp, with a large modulus */
struct type50_meb2_msg {
	struct type50_hdr header;
	unsigned short	keyblock_type;	/* 0x0002 */
	unsigned char	reserved[6];
	unsigned char	exponent[256];
	unsigned char	modulus[256];
	unsigned char	message[256];
} __packed;

/* Mod-Exp, with a larger modulus */
struct type50_meb3_msg {
	struct type50_hdr header;
	unsigned short	keyblock_type;	/* 0x0003 */
	unsigned char	reserved[6];
	unsigned char	exponent[512];
	unsigned char	modulus[512];
	unsigned char	message[512];
} __packed;

/* CRT, with a small modulus */
struct type50_crb1_msg {
	struct type50_hdr header;
	unsigned short	keyblock_type;	/* 0x0011 */
	unsigned char	reserved[6];
	unsigned char	p[64];
	unsigned char	q[64];
	unsigned char	dp[64];
	unsigned char	dq[64];
	unsigned char	u[64];
	unsigned char	message[128];
} __packed;

/* CRT, with a large modulus */
struct type50_crb2_msg {
	struct type50_hdr header;
	unsigned short	keyblock_type;	/* 0x0012 */
	unsigned char	reserved[6];
	unsigned char	p[128];
	unsigned char	q[128];
	unsigned char	dp[128];
	unsigned char	dq[128];
	unsigned char	u[128];
	unsigned char	message[256];
} __packed;

/* CRT, with a larger modulus */
struct type50_crb3_msg {
	struct type50_hdr header;
	unsigned short	keyblock_type;	/* 0x0013 */
	unsigned char	reserved[6];
	unsigned char	p[256];
	unsigned char	q[256];
	unsigned char	dp[256];
	unsigned char	dq[256];
	unsigned char	u[256];
	unsigned char	message[512];
} __packed;

/**
 * The type 80 response family is associated with a CEX2A card.
 *
 * Note that all unsigned char arrays are right-justified and left-padded
 * with zeroes.
 *
 * Note that all reserved fields must be zeroes.
 */

#define TYPE80_RSP_CODE 0x80

struct type80_hdr {
	unsigned char	reserved1;
	unsigned char	type;		/* 0x80 */
	unsigned short	len;
	unsigned char	code;		/* 0x00 */
	unsigned char	reserved2[3];
	unsigned char	reserved3[8];
} __packed;

unsigned int get_rsa_modex_fc(struct ica_rsa_modexpo *mex, int *fcode)
{

	if (!mex->inputdatalength)
		return -EINVAL;

	if (mex->inputdatalength <= 128)	/* 1024 bit */
		*fcode = MEX_1K;
	else if (mex->inputdatalength <= 256)	/* 2048 bit */
		*fcode = MEX_2K;
	else					/* 4096 bit */
		*fcode = MEX_4K;

	return 0;
}

unsigned int get_rsa_crt_fc(struct ica_rsa_modexpo_crt *crt, int *fcode)
{

	if (!crt->inputdatalength)
		return -EINVAL;

	if (crt->inputdatalength <= 128)	/* 1024 bit */
		*fcode = CRT_1K;
	else if (crt->inputdatalength <= 256)	/* 2048 bit */
		*fcode = CRT_2K;
	else					/* 4096 bit */
		*fcode = CRT_4K;

	return 0;
}

/**
 * Convert a ICAMEX message to a type50 MEX message.
 *
 * @zq: crypto queue pointer
 * @ap_msg: crypto request pointer
 * @mex: pointer to user input data
 *
 * Returns 0 on success or -EFAULT.
 */
static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_queue *zq,
				       struct ap_message *ap_msg,
				       struct ica_rsa_modexpo *mex)
{
	unsigned char *mod, *exp, *inp;
	int mod_len;

	mod_len = mex->inputdatalength;

	if (mod_len <= 128) {
		struct type50_meb1_msg *meb1 = ap_msg->message;
		memset(meb1, 0, sizeof(*meb1));
		ap_msg->length = sizeof(*meb1);
		meb1->header.msg_type_code = TYPE50_TYPE_CODE;
		meb1->header.msg_len = sizeof(*meb1);
		meb1->keyblock_type = TYPE50_MEB1_FMT;
		mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
		exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
		inp = meb1->message + sizeof(meb1->message) - mod_len;
	} else if (mod_len <= 256) {
		struct type50_meb2_msg *meb2 = ap_msg->message;
		memset(meb2, 0, sizeof(*meb2));
		ap_msg->length = sizeof(*meb2);
		meb2->header.msg_type_code = TYPE50_TYPE_CODE;
		meb2->header.msg_len = sizeof(*meb2);
		meb2->keyblock_type = TYPE50_MEB2_FMT;
		mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
		exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
		inp = meb2->message + sizeof(meb2->message) - mod_len;
	} else if (mod_len <= 512) {
		struct type50_meb3_msg *meb3 = ap_msg->message;
		memset(meb3, 0, sizeof(*meb3));
		ap_msg->length = sizeof(*meb3);
		meb3->header.msg_type_code = TYPE50_TYPE_CODE;
		meb3->header.msg_len = sizeof(*meb3);
		meb3->keyblock_type = TYPE50_MEB3_FMT;
		mod = meb3->modulus + sizeof(meb3->modulus) - mod_len;
		exp = meb3->exponent + sizeof(meb3->exponent) - mod_len;
		inp = meb3->message + sizeof(meb3->message) - mod_len;
	} else
		return -EINVAL;

	if (copy_from_user(mod, mex->n_modulus, mod_len) ||
	    copy_from_user(exp, mex->b_key, mod_len) ||
	    copy_from_user(inp, mex->inputdata, mod_len))
		return -EFAULT;
	return 0;
}

/**
 * Convert a ICACRT message to a type50 CRT message.
 *
 * @zq: crypto queue pointer
 * @ap_msg: crypto request pointer
 * @crt: pointer to user input data
 *
 * Returns 0 on success or -EFAULT.
 */
static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_queue *zq,
				       struct ap_message *ap_msg,
				       struct ica_rsa_modexpo_crt *crt)
{
	int mod_len, short_len;
	unsigned char *p, *q, *dp, *dq, *u, *inp;

	mod_len = crt->inputdatalength;
	short_len = (mod_len + 1) / 2;

	/*
	 * CEX2A and CEX3A w/o FW update can handle requests up to
	 * 256 byte modulus (2k keys).
	 * CEX3A with FW update and CEX4A cards are able to handle
	 * 512 byte modulus (4k keys).
	 */
	if (mod_len <= 128) {		/* up to 1024 bit key size */
		struct type50_crb1_msg *crb1 = ap_msg->message;
		memset(crb1, 0, sizeof(*crb1));
		ap_msg->length = sizeof(*crb1);
		crb1->header.msg_type_code = TYPE50_TYPE_CODE;
		crb1->header.msg_len = sizeof(*crb1);
		crb1->keyblock_type = TYPE50_CRB1_FMT;
		p = crb1->p + sizeof(crb1->p) - short_len;
		q = crb1->q + sizeof(crb1->q) - short_len;
		dp = crb1->dp + sizeof(crb1->dp) - short_len;
		dq = crb1->dq + sizeof(crb1->dq) - short_len;
		u = crb1->u + sizeof(crb1->u) - short_len;
		inp = crb1->message + sizeof(crb1->message) - mod_len;
	} else if (mod_len <= 256) {	/* up to 2048 bit key size */
		struct type50_crb2_msg *crb2 = ap_msg->message;
		memset(crb2, 0, sizeof(*crb2));
		ap_msg->length = sizeof(*crb2);
		crb2->header.msg_type_code = TYPE50_TYPE_CODE;
		crb2->header.msg_len = sizeof(*crb2);
		crb2->keyblock_type = TYPE50_CRB2_FMT;
		p = crb2->p + sizeof(crb2->p) - short_len;
		q = crb2->q + sizeof(crb2->q) - short_len;
		dp = crb2->dp + sizeof(crb2->dp) - short_len;
		dq = crb2->dq + sizeof(crb2->dq) - short_len;
		u = crb2->u + sizeof(crb2->u) - short_len;
		inp = crb2->message + sizeof(crb2->message) - mod_len;
	} else if ((mod_len <= 512) &&	/* up to 4096 bit key size */
		   (zq->zcard->max_mod_size == CEX3A_MAX_MOD_SIZE)) {
		struct type50_crb3_msg *crb3 = ap_msg->message;
		memset(crb3, 0, sizeof(*crb3));
		ap_msg->length = sizeof(*crb3);
		crb3->header.msg_type_code = TYPE50_TYPE_CODE;
		crb3->header.msg_len = sizeof(*crb3);
		crb3->keyblock_type = TYPE50_CRB3_FMT;
		p = crb3->p + sizeof(crb3->p) - short_len;
		q = crb3->q + sizeof(crb3->q) - short_len;
		dp = crb3->dp + sizeof(crb3->dp) - short_len;
		dq = crb3->dq + sizeof(crb3->dq) - short_len;
		u = crb3->u + sizeof(crb3->u) - short_len;
		inp = crb3->message + sizeof(crb3->message) - mod_len;
	} else
		return -EINVAL;

	/*
	 * correct the offset of p, bp and mult_inv according zcrypt.h
	 * block size right aligned (skip the first byte)
	 */
	if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) ||
	    copy_from_user(q, crt->nq_prime, short_len) ||
	    copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) ||
	    copy_from_user(dq, crt->bq_key, short_len) ||
	    copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) ||
	    copy_from_user(inp, crt->inputdata, mod_len))
		return -EFAULT;

	return 0;
}

/**
 * Copy results from a type 80 reply message back to user space.
 *
 * @zq: crypto device pointer
 * @reply: reply AP message.
 * @data: pointer to user output data
 * @length: size of user output data
 *
 * Returns 0 on success or -EFAULT.
 */
static int convert_type80(struct zcrypt_queue *zq,
			  struct ap_message *reply,
			  char __user *outputdata,
			  unsigned int outputdatalength)
{
	struct type80_hdr *t80h = reply->message;
	unsigned char *data;

	if (t80h->len < sizeof(*t80h) + outputdatalength) {
		/* The result is too short, the CEX2A card may not do that.. */
		zq->online = 0;
		pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
		       AP_QID_CARD(zq->queue->qid),
		       AP_QID_QUEUE(zq->queue->qid));
		ZCRYPT_DBF(DBF_ERR,
			   "device=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n",
			   AP_QID_CARD(zq->queue->qid),
			   AP_QID_QUEUE(zq->queue->qid),
			   t80h->code);
		return -EAGAIN;	/* repeat the request on a different device. */
	}
	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
		BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
	else
		BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE);
	data = reply->message + t80h->len - outputdatalength;
	if (copy_to_user(outputdata, data, outputdatalength))
		return -EFAULT;
	return 0;
}

static int convert_response(struct zcrypt_queue *zq,
			    struct ap_message *reply,
			    char __user *outputdata,
			    unsigned int outputdatalength)
{
	/* Response type byte is the second byte in the response. */
	unsigned char rtype = ((unsigned char *) reply->message)[1];

	switch (rtype) {
	case TYPE82_RSP_CODE:
	case TYPE88_RSP_CODE:
		return convert_error(zq, reply);
	case TYPE80_RSP_CODE:
		return convert_type80(zq, reply,
				      outputdata, outputdatalength);
	default: /* Unknown response type, this should NEVER EVER happen */
		zq->online = 0;
		pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
		       AP_QID_CARD(zq->queue->qid),
		       AP_QID_QUEUE(zq->queue->qid));
		ZCRYPT_DBF(DBF_ERR,
			   "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n",
			   AP_QID_CARD(zq->queue->qid),
			   AP_QID_QUEUE(zq->queue->qid),
			   (unsigned int) rtype);
		return -EAGAIN;	/* repeat the request on a different device. */
	}
}

/**
 * This function is called from the AP bus code after a crypto request
 * "msg" has finished with the reply message "reply".
 * It is called from tasklet context.
 * @aq: pointer to the AP device
 * @msg: pointer to the AP message
 * @reply: pointer to the AP reply message
 */
static void zcrypt_cex2a_receive(struct ap_queue *aq,
				 struct ap_message *msg,
				 struct ap_message *reply)
{
	static struct error_hdr error_reply = {
		.type = TYPE82_RSP_CODE,
		.reply_code = REP82_ERROR_MACHINE_FAILURE,
	};
	struct type80_hdr *t80h;
	int length;

	/* Copy the reply message to the request message buffer. */
	if (!reply)
		goto out;	/* ap_msg->rc indicates the error */
	t80h = reply->message;
	if (t80h->type == TYPE80_RSP_CODE) {
		if (aq->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A)
			length = min_t(int,
				       CEX2A_MAX_RESPONSE_SIZE, t80h->len);
		else
			length = min_t(int,
				       CEX3A_MAX_RESPONSE_SIZE, t80h->len);
		memcpy(msg->message, reply->message, length);
	} else
		memcpy(msg->message, reply->message, sizeof(error_reply));
out:
	complete((struct completion *) msg->private);
}

static atomic_t zcrypt_step = ATOMIC_INIT(0);

/**
 * The request distributor calls this function if it picked the CEX2A
 * device to handle a modexpo request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *	  CEX2A device to the request distributor
 * @mex: pointer to the modexpo request buffer
 */
static long zcrypt_cex2a_modexpo(struct zcrypt_queue *zq,
				 struct ica_rsa_modexpo *mex)
{
	struct ap_message ap_msg;
	struct completion work;
	int rc;

	ap_init_message(&ap_msg);
	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
		ap_msg.message = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE,
					 GFP_KERNEL);
	else
		ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE,
					 GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.receive = zcrypt_cex2a_receive;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &work;
	rc = ICAMEX_msg_to_type50MEX_msg(zq, &ap_msg, mex);
	if (rc)
		goto out_free;
	init_completion(&work);
	ap_queue_message(zq->queue, &ap_msg);
	rc = wait_for_completion_interruptible(&work);
	if (rc == 0) {
		rc = ap_msg.rc;
		if (rc == 0)
			rc = convert_response(zq, &ap_msg, mex->outputdata,
					      mex->outputdatalength);
	} else
		/* Signal pending. */
		ap_cancel_message(zq->queue, &ap_msg);
out_free:
	kfree(ap_msg.message);
	return rc;
}

/**
 * The request distributor calls this function if it picked the CEX2A
 * device to handle a modexpo_crt request.
 * @zq: pointer to zcrypt_queue structure that identifies the
 *	  CEX2A device to the request distributor
 * @crt: pointer to the modexpoc_crt request buffer
 */
static long zcrypt_cex2a_modexpo_crt(struct zcrypt_queue *zq,
				     struct ica_rsa_modexpo_crt *crt)
{
	struct ap_message ap_msg;
	struct completion work;
	int rc;

	ap_init_message(&ap_msg);
	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
		ap_msg.message = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE,
					 GFP_KERNEL);
	else
		ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE,
					 GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.receive = zcrypt_cex2a_receive;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &work;
	rc = ICACRT_msg_to_type50CRT_msg(zq, &ap_msg, crt);
	if (rc)
		goto out_free;
	init_completion(&work);
	ap_queue_message(zq->queue, &ap_msg);
	rc = wait_for_completion_interruptible(&work);
	if (rc == 0) {
		rc = ap_msg.rc;
		if (rc == 0)
			rc = convert_response(zq, &ap_msg, crt->outputdata,
					      crt->outputdatalength);
	} else
		/* Signal pending. */
		ap_cancel_message(zq->queue, &ap_msg);
out_free:
	kfree(ap_msg.message);
	return rc;
}

/**
 * The crypto operations for message type 50.
 */
static struct zcrypt_ops zcrypt_msgtype50_ops = {
	.rsa_modexpo = zcrypt_cex2a_modexpo,
	.rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt,
	.owner = THIS_MODULE,
	.name = MSGTYPE50_NAME,
	.variant = MSGTYPE50_VARIANT_DEFAULT,
};

void __init zcrypt_msgtype50_init(void)
{
	zcrypt_msgtype_register(&zcrypt_msgtype50_ops);
}

void __exit zcrypt_msgtype50_exit(void)
{
	zcrypt_msgtype_unregister(&zcrypt_msgtype50_ops);
}
Commit	Line	Data
812141a9	1	// SPDX-License-Identifier: GPL-2.0+
5e55a488 HD	2	/*
	3	* zcrypt 2.1.0
	4	*
	5	* Copyright IBM Corp. 2001, 2012
	6	* Author(s): Robert Burroughs
	7	* Eric Rossman (edrossma@us.ibm.com)
	8	*
	9	* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
	10	* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
	11	* Ralph Wuerthner <rwuerthn@de.ibm.com>
	12	* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
5e55a488 HD	13	*/
5e55a488 HD	14
91f3e3ea IT	15	#define KMSG_COMPONENT "zcrypt"
	16	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	17
5e55a488 HD	18	#include <linux/module.h>
	19	#include <linux/slab.h>
	20	#include <linux/init.h>
	21	#include <linux/err.h>
	22	#include <linux/atomic.h>
	23	#include <linux/uaccess.h>
	24
	25	#include "ap_bus.h"
	26	#include "zcrypt_api.h"
	27	#include "zcrypt_error.h"
	28	#include "zcrypt_msgtype50.h"
	29
	30	#define CEX3A_MAX_MOD_SIZE 512 /* 4096 bits */
	31
	32	#define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */
	33
	34	#define CEX3A_MAX_RESPONSE_SIZE 0x210 /* 512 bit modulus
	35	* (max outputdatalength) +
	36	* type80_hdr*/
	37
	38	MODULE_AUTHOR("IBM Corporation");
	39	MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \
	40	"Copyright IBM Corp. 2001, 2012");
	41	MODULE_LICENSE("GPL");
	42
5e55a488 HD	43	/**
	44	* The type 50 message family is associated with a CEX2A card.
	45	*
	46	* The four members of the family are described below.
	47	*
	48	* Note that all unsigned char arrays are right-justified and left-padded
	49	* with zeroes.
	50	*
	51	* Note that all reserved fields must be zeroes.
	52	*/
	53	struct type50_hdr {
	54	unsigned char reserved1;
	55	unsigned char msg_type_code; /* 0x50 */
	56	unsigned short msg_len;
	57	unsigned char reserved2;
	58	unsigned char ignored;
	59	unsigned short reserved3;
	60	} __packed;
	61
	62	#define TYPE50_TYPE_CODE 0x50
	63
	64	#define TYPE50_MEB1_FMT 0x0001
	65	#define TYPE50_MEB2_FMT 0x0002
	66	#define TYPE50_MEB3_FMT 0x0003
	67	#define TYPE50_CRB1_FMT 0x0011
	68	#define TYPE50_CRB2_FMT 0x0012
	69	#define TYPE50_CRB3_FMT 0x0013
	70
	71	/* Mod-Exp, with a small modulus */
	72	struct type50_meb1_msg {
	73	struct type50_hdr header;
	74	unsigned short keyblock_type; /* 0x0001 */
	75	unsigned char reserved[6];
	76	unsigned char exponent[128];
	77	unsigned char modulus[128];
	78	unsigned char message[128];
	79	} __packed;
	80
	81	/* Mod-Exp, with a large modulus */
	82	struct type50_meb2_msg {
	83	struct type50_hdr header;
	84	unsigned short keyblock_type; /* 0x0002 */
	85	unsigned char reserved[6];
	86	unsigned char exponent[256];
	87	unsigned char modulus[256];
	88	unsigned char message[256];
	89	} __packed;
	90
	91	/* Mod-Exp, with a larger modulus */
	92	struct type50_meb3_msg {
	93	struct type50_hdr header;
	94	unsigned short keyblock_type; /* 0x0003 */
	95	unsigned char reserved[6];
	96	unsigned char exponent[512];
	97	unsigned char modulus[512];
	98	unsigned char message[512];
	99	} __packed;
	100
	101	/* CRT, with a small modulus */
	102	struct type50_crb1_msg {
	103	struct type50_hdr header;
	104	unsigned short keyblock_type; /* 0x0011 */
	105	unsigned char reserved[6];
	106	unsigned char p[64];
107	unsigned char q[64];
108	unsigned char dp[64];
109	unsigned char dq[64];
110	unsigned char u[64];
111	unsigned char message[128];
112	} __packed;
113
114	/* CRT, with a large modulus */
115	struct type50_crb2_msg {
116	struct type50_hdr header;
117	unsigned short keyblock_type; /* 0x0012 */
118	unsigned char reserved[6];
119	unsigned char p[128];
120	unsigned char q[128];
121	unsigned char dp[128];
122	unsigned char dq[128];
123	unsigned char u[128];
124	unsigned char message[256];
125	} __packed;
126
127	/* CRT, with a larger modulus */
128	struct type50_crb3_msg {
129	struct type50_hdr header;
130	unsigned short keyblock_type; /* 0x0013 */
131	unsigned char reserved[6];
132	unsigned char p[256];
133	unsigned char q[256];
134	unsigned char dp[256];
135	unsigned char dq[256];
136	unsigned char u[256];
137	unsigned char message[512];
138	} __packed;
139
140	/**
141	* The type 80 response family is associated with a CEX2A card.
142	*
143	* Note that all unsigned char arrays are right-justified and left-padded
144	* with zeroes.
145	*
146	* Note that all reserved fields must be zeroes.
147	*/
148
149	#define TYPE80_RSP_CODE 0x80
150
151	struct type80_hdr {
152	unsigned char reserved1;
153	unsigned char type; /* 0x80 */
154	unsigned short len;
155	unsigned char code; /* 0x00 */
156	unsigned char reserved2[3];
157	unsigned char reserved3[8];
158	} __packed;
159
34a15167 IT	160	unsigned int get_rsa_modex_fc(struct ica_rsa_modexpo mex, int fcode)
	161	{
	162
	163	if (!mex->inputdatalength)
	164	return -EINVAL;
	165
	166	if (mex->inputdatalength <= 128) /* 1024 bit */
	167	*fcode = MEX_1K;
	168	else if (mex->inputdatalength <= 256) /* 2048 bit */
	169	*fcode = MEX_2K;
	170	else /* 4096 bit */
	171	*fcode = MEX_4K;
	172
	173	return 0;
	174	}
	175
	176	unsigned int get_rsa_crt_fc(struct ica_rsa_modexpo_crt crt, int fcode)
	177	{
	178
	179	if (!crt->inputdatalength)
	180	return -EINVAL;
	181
	182	if (crt->inputdatalength <= 128) /* 1024 bit */
	183	*fcode = CRT_1K;
	184	else if (crt->inputdatalength <= 256) /* 2048 bit */
	185	*fcode = CRT_2K;
	186	else /* 4096 bit */
	187	*fcode = CRT_4K;
	188
	189	return 0;
	190	}
	191
5e55a488 HD	192	/**
	193	* Convert a ICAMEX message to a type50 MEX message.
	194	*
e28d2af4 IT	195	* @zq: crypto queue pointer
e28d2af4 IT	196	* @ap_msg: crypto request pointer
5e55a488 HD	197	* @mex: pointer to user input data
	198	*
	199	* Returns 0 on success or -EFAULT.
	200	*/
e28d2af4	201	static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_queue *zq,
5e55a488 HD	202	struct ap_message *ap_msg,
	203	struct ica_rsa_modexpo *mex)
	204	{
	205	unsigned char mod, exp, *inp;
	206	int mod_len;
	207
	208	mod_len = mex->inputdatalength;
	209
	210	if (mod_len <= 128) {
	211	struct type50_meb1_msg *meb1 = ap_msg->message;
	212	memset(meb1, 0, sizeof(*meb1));
	213	ap_msg->length = sizeof(*meb1);
	214	meb1->header.msg_type_code = TYPE50_TYPE_CODE;
	215	meb1->header.msg_len = sizeof(*meb1);
	216	meb1->keyblock_type = TYPE50_MEB1_FMT;
	217	mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
	218	exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
	219	inp = meb1->message + sizeof(meb1->message) - mod_len;
	220	} else if (mod_len <= 256) {
	221	struct type50_meb2_msg *meb2 = ap_msg->message;
	222	memset(meb2, 0, sizeof(*meb2));
	223	ap_msg->length = sizeof(*meb2);
	224	meb2->header.msg_type_code = TYPE50_TYPE_CODE;
	225	meb2->header.msg_len = sizeof(*meb2);
	226	meb2->keyblock_type = TYPE50_MEB2_FMT;
	227	mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
	228	exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
	229	inp = meb2->message + sizeof(meb2->message) - mod_len;
76b31381	230	} else if (mod_len <= 512) {
5e55a488 HD	231	struct type50_meb3_msg *meb3 = ap_msg->message;
	232	memset(meb3, 0, sizeof(*meb3));
	233	ap_msg->length = sizeof(*meb3);
	234	meb3->header.msg_type_code = TYPE50_TYPE_CODE;
	235	meb3->header.msg_len = sizeof(*meb3);
	236	meb3->keyblock_type = TYPE50_MEB3_FMT;
	237	mod = meb3->modulus + sizeof(meb3->modulus) - mod_len;
	238	exp = meb3->exponent + sizeof(meb3->exponent) - mod_len;
	239	inp = meb3->message + sizeof(meb3->message) - mod_len;
76b31381 HF	240	} else
76b31381 HF	241	return -EINVAL;
5e55a488 HD	242
	243	if (copy_from_user(mod, mex->n_modulus, mod_len) \|\|
	244	copy_from_user(exp, mex->b_key, mod_len) \|\|
	245	copy_from_user(inp, mex->inputdata, mod_len))
	246	return -EFAULT;
	247	return 0;
	248	}
	249
	250	/**
	251	* Convert a ICACRT message to a type50 CRT message.
	252	*
e28d2af4 IT	253	* @zq: crypto queue pointer
e28d2af4 IT	254	* @ap_msg: crypto request pointer
5e55a488 HD	255	* @crt: pointer to user input data
	256	*
	257	* Returns 0 on success or -EFAULT.
	258	*/
e28d2af4	259	static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_queue *zq,
5e55a488 HD	260	struct ap_message *ap_msg,
	261	struct ica_rsa_modexpo_crt *crt)
	262	{
1e466fcf	263	int mod_len, short_len;
5e55a488 HD	264	unsigned char p, q, dp, dq, u, inp;
	265
	266	mod_len = crt->inputdatalength;
1330a125	267	short_len = (mod_len + 1) / 2;
5e55a488 HD	268
5e55a488 HD	269	/*
1e466fcf IT	270	* CEX2A and CEX3A w/o FW update can handle requests up to
	271	* 256 byte modulus (2k keys).
	272	* CEX3A with FW update and CEX4A cards are able to handle
	273	* 512 byte modulus (4k keys).
5e55a488	274	*/
1e466fcf	275	if (mod_len <= 128) { /* up to 1024 bit key size */
5e55a488 HD	276	struct type50_crb1_msg *crb1 = ap_msg->message;
	277	memset(crb1, 0, sizeof(*crb1));
	278	ap_msg->length = sizeof(*crb1);
	279	crb1->header.msg_type_code = TYPE50_TYPE_CODE;
	280	crb1->header.msg_len = sizeof(*crb1);
	281	crb1->keyblock_type = TYPE50_CRB1_FMT;
1e466fcf	282	p = crb1->p + sizeof(crb1->p) - short_len;
5e55a488	283	q = crb1->q + sizeof(crb1->q) - short_len;
1e466fcf	284	dp = crb1->dp + sizeof(crb1->dp) - short_len;
5e55a488	285	dq = crb1->dq + sizeof(crb1->dq) - short_len;
1e466fcf	286	u = crb1->u + sizeof(crb1->u) - short_len;
5e55a488	287	inp = crb1->message + sizeof(crb1->message) - mod_len;
1e466fcf	288	} else if (mod_len <= 256) { /* up to 2048 bit key size */
5e55a488 HD	289	struct type50_crb2_msg *crb2 = ap_msg->message;
	290	memset(crb2, 0, sizeof(*crb2));
	291	ap_msg->length = sizeof(*crb2);
	292	crb2->header.msg_type_code = TYPE50_TYPE_CODE;
	293	crb2->header.msg_len = sizeof(*crb2);
	294	crb2->keyblock_type = TYPE50_CRB2_FMT;
1e466fcf	295	p = crb2->p + sizeof(crb2->p) - short_len;
5e55a488	296	q = crb2->q + sizeof(crb2->q) - short_len;
1e466fcf	297	dp = crb2->dp + sizeof(crb2->dp) - short_len;
5e55a488	298	dq = crb2->dq + sizeof(crb2->dq) - short_len;
1e466fcf	299	u = crb2->u + sizeof(crb2->u) - short_len;
5e55a488	300	inp = crb2->message + sizeof(crb2->message) - mod_len;
1e466fcf	301	} else if ((mod_len <= 512) && /* up to 4096 bit key size */
e28d2af4	302	(zq->zcard->max_mod_size == CEX3A_MAX_MOD_SIZE)) {
5e55a488 HD	303	struct type50_crb3_msg *crb3 = ap_msg->message;
	304	memset(crb3, 0, sizeof(*crb3));
	305	ap_msg->length = sizeof(*crb3);
	306	crb3->header.msg_type_code = TYPE50_TYPE_CODE;
	307	crb3->header.msg_len = sizeof(*crb3);
	308	crb3->keyblock_type = TYPE50_CRB3_FMT;
1e466fcf	309	p = crb3->p + sizeof(crb3->p) - short_len;
5e55a488	310	q = crb3->q + sizeof(crb3->q) - short_len;
1e466fcf	311	dp = crb3->dp + sizeof(crb3->dp) - short_len;
5e55a488	312	dq = crb3->dq + sizeof(crb3->dq) - short_len;
1e466fcf	313	u = crb3->u + sizeof(crb3->u) - short_len;
5e55a488	314	inp = crb3->message + sizeof(crb3->message) - mod_len;
1e466fcf IT	315	} else
1e466fcf IT	316	return -EINVAL;
5e55a488	317
1e466fcf IT	318	/*
	319	* correct the offset of p, bp and mult_inv according zcrypt.h
	320	* block size right aligned (skip the first byte)
	321	*/
	322	if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) \|\|
5e55a488	323	copy_from_user(q, crt->nq_prime, short_len) \|\|
1e466fcf	324	copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) \|\|
5e55a488	325	copy_from_user(dq, crt->bq_key, short_len) \|\|
1e466fcf	326	copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) \|\|
5e55a488 HD	327	copy_from_user(inp, crt->inputdata, mod_len))
	328	return -EFAULT;
	329
	330	return 0;
	331	}
	332
	333	/**
	334	* Copy results from a type 80 reply message back to user space.
	335	*
e28d2af4	336	* @zq: crypto device pointer
5e55a488 HD	337	* @reply: reply AP message.
	338	* @data: pointer to user output data
	339	* @length: size of user output data
	340	*
	341	* Returns 0 on success or -EFAULT.
	342	*/
e28d2af4	343	static int convert_type80(struct zcrypt_queue *zq,
5e55a488 HD	344	struct ap_message *reply,
	345	char __user *outputdata,
	346	unsigned int outputdatalength)
	347	{
	348	struct type80_hdr *t80h = reply->message;
	349	unsigned char *data;
	350
	351	if (t80h->len < sizeof(*t80h) + outputdatalength) {
	352	/* The result is too short, the CEX2A card may not do that.. */
e28d2af4 IT	353	zq->online = 0;
	354	pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
	355	AP_QID_CARD(zq->queue->qid),
	356	AP_QID_QUEUE(zq->queue->qid));
cccd85bf HF	357	ZCRYPT_DBF(DBF_ERR,
	358	"device=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n",
	359	AP_QID_CARD(zq->queue->qid),
	360	AP_QID_QUEUE(zq->queue->qid),
	361	t80h->code);
5e55a488 HD	362	return -EAGAIN; /* repeat the request on a different device. */
5e55a488 HD	363	}
e28d2af4	364	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
5e55a488 HD	365	BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
	366	else
	367	BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE);
	368	data = reply->message + t80h->len - outputdatalength;
	369	if (copy_to_user(outputdata, data, outputdatalength))
	370	return -EFAULT;
	371	return 0;
	372	}
	373
e28d2af4	374	static int convert_response(struct zcrypt_queue *zq,
5e55a488 HD	375	struct ap_message *reply,
	376	char __user *outputdata,
	377	unsigned int outputdatalength)
	378	{
	379	/* Response type byte is the second byte in the response. */
cccd85bf HF	380	unsigned char rtype = ((unsigned char *) reply->message)[1];
	381
	382	switch (rtype) {
5e55a488 HD	383	case TYPE82_RSP_CODE:
5e55a488 HD	384	case TYPE88_RSP_CODE:
e28d2af4	385	return convert_error(zq, reply);
5e55a488	386	case TYPE80_RSP_CODE:
e28d2af4	387	return convert_type80(zq, reply,
5e55a488 HD	388	outputdata, outputdatalength);
5e55a488 HD	389	default: /* Unknown response type, this should NEVER EVER happen */
e28d2af4 IT	390	zq->online = 0;
	391	pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
	392	AP_QID_CARD(zq->queue->qid),
	393	AP_QID_QUEUE(zq->queue->qid));
cccd85bf HF	394	ZCRYPT_DBF(DBF_ERR,
	395	"device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n",
	396	AP_QID_CARD(zq->queue->qid),
	397	AP_QID_QUEUE(zq->queue->qid),
	398	(unsigned int) rtype);
5e55a488 HD	399	return -EAGAIN; /* repeat the request on a different device. */
	400	}
	401	}
	402
	403	/**
	404	* This function is called from the AP bus code after a crypto request
	405	* "msg" has finished with the reply message "reply".
	406	* It is called from tasklet context.
e28d2af4	407	* @aq: pointer to the AP device
5e55a488 HD	408	* @msg: pointer to the AP message
	409	* @reply: pointer to the AP reply message
	410	*/
e28d2af4	411	static void zcrypt_cex2a_receive(struct ap_queue *aq,
5e55a488 HD	412	struct ap_message *msg,
	413	struct ap_message *reply)
	414	{
	415	static struct error_hdr error_reply = {
	416	.type = TYPE82_RSP_CODE,
	417	.reply_code = REP82_ERROR_MACHINE_FAILURE,
	418	};
	419	struct type80_hdr *t80h;
	420	int length;
	421
	422	/* Copy the reply message to the request message buffer. */
f58fe336 MS	423	if (!reply)
f58fe336 MS	424	goto out; /* ap_msg->rc indicates the error */
5e55a488 HD	425	t80h = reply->message;
5e55a488 HD	426	if (t80h->type == TYPE80_RSP_CODE) {
e28d2af4	427	if (aq->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A)
5e55a488 HD	428	length = min_t(int,
	429	CEX2A_MAX_RESPONSE_SIZE, t80h->len);
	430	else
	431	length = min_t(int,
	432	CEX3A_MAX_RESPONSE_SIZE, t80h->len);
	433	memcpy(msg->message, reply->message, length);
	434	} else
	435	memcpy(msg->message, reply->message, sizeof(error_reply));
	436	out:
	437	complete((struct completion *) msg->private);
	438	}
	439
	440	static atomic_t zcrypt_step = ATOMIC_INIT(0);
	441
	442	/**
	443	* The request distributor calls this function if it picked the CEX2A
	444	* device to handle a modexpo request.
e28d2af4	445	* @zq: pointer to zcrypt_queue structure that identifies the
5e55a488 HD	446	* CEX2A device to the request distributor
	447	* @mex: pointer to the modexpo request buffer
	448	*/
e28d2af4	449	static long zcrypt_cex2a_modexpo(struct zcrypt_queue *zq,
5e55a488 HD	450	struct ica_rsa_modexpo *mex)
	451	{
	452	struct ap_message ap_msg;
	453	struct completion work;
	454	int rc;
	455
	456	ap_init_message(&ap_msg);
e28d2af4	457	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
5e55a488 HD	458	ap_msg.message = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE,
	459	GFP_KERNEL);
	460	else
	461	ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE,
	462	GFP_KERNEL);
	463	if (!ap_msg.message)
	464	return -ENOMEM;
	465	ap_msg.receive = zcrypt_cex2a_receive;
	466	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
	467	atomic_inc_return(&zcrypt_step);
	468	ap_msg.private = &work;
e28d2af4	469	rc = ICAMEX_msg_to_type50MEX_msg(zq, &ap_msg, mex);
5e55a488 HD	470	if (rc)
	471	goto out_free;
	472	init_completion(&work);
e28d2af4	473	ap_queue_message(zq->queue, &ap_msg);
5e55a488	474	rc = wait_for_completion_interruptible(&work);
f58fe336 MS	475	if (rc == 0) {
	476	rc = ap_msg.rc;
	477	if (rc == 0)
e28d2af4	478	rc = convert_response(zq, &ap_msg, mex->outputdata,
f58fe336 MS	479	mex->outputdatalength);
f58fe336 MS	480	} else
5e55a488	481	/* Signal pending. */
e28d2af4	482	ap_cancel_message(zq->queue, &ap_msg);
5e55a488 HD	483	out_free:
	484	kfree(ap_msg.message);
	485	return rc;
	486	}
	487
	488	/**
	489	* The request distributor calls this function if it picked the CEX2A
	490	* device to handle a modexpo_crt request.
e28d2af4	491	* @zq: pointer to zcrypt_queue structure that identifies the
5e55a488 HD	492	* CEX2A device to the request distributor
	493	* @crt: pointer to the modexpoc_crt request buffer
	494	*/
e28d2af4	495	static long zcrypt_cex2a_modexpo_crt(struct zcrypt_queue *zq,
5e55a488 HD	496	struct ica_rsa_modexpo_crt *crt)
	497	{
	498	struct ap_message ap_msg;
	499	struct completion work;
	500	int rc;
	501
	502	ap_init_message(&ap_msg);
e28d2af4	503	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
5e55a488 HD	504	ap_msg.message = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE,
	505	GFP_KERNEL);
	506	else
	507	ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE,
	508	GFP_KERNEL);
	509	if (!ap_msg.message)
	510	return -ENOMEM;
	511	ap_msg.receive = zcrypt_cex2a_receive;
	512	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
	513	atomic_inc_return(&zcrypt_step);
	514	ap_msg.private = &work;
e28d2af4	515	rc = ICACRT_msg_to_type50CRT_msg(zq, &ap_msg, crt);
5e55a488 HD	516	if (rc)
	517	goto out_free;
	518	init_completion(&work);
e28d2af4	519	ap_queue_message(zq->queue, &ap_msg);
5e55a488	520	rc = wait_for_completion_interruptible(&work);
f58fe336 MS	521	if (rc == 0) {
	522	rc = ap_msg.rc;
	523	if (rc == 0)
e28d2af4	524	rc = convert_response(zq, &ap_msg, crt->outputdata,
f58fe336 MS	525	crt->outputdatalength);
f58fe336 MS	526	} else
5e55a488	527	/* Signal pending. */
e28d2af4	528	ap_cancel_message(zq->queue, &ap_msg);
5e55a488 HD	529	out_free:
	530	kfree(ap_msg.message);
	531	return rc;
	532	}
	533
	534	/**
	535	* The crypto operations for message type 50.
	536	*/
	537	static struct zcrypt_ops zcrypt_msgtype50_ops = {
	538	.rsa_modexpo = zcrypt_cex2a_modexpo,
	539	.rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt,
	540	.owner = THIS_MODULE,
121a868d	541	.name = MSGTYPE50_NAME,
5e55a488 HD	542	.variant = MSGTYPE50_VARIANT_DEFAULT,
	543	};
	544
fc1d3f02	545	void __init zcrypt_msgtype50_init(void)
5e55a488 HD	546	{
5e55a488 HD	547	zcrypt_msgtype_register(&zcrypt_msgtype50_ops);
5e55a488 HD	548	}
	549
	550	void __exit zcrypt_msgtype50_exit(void)
	551	{
	552	zcrypt_msgtype_unregister(&zcrypt_msgtype50_ops);
	553	}