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// SPDX-License-Identifier: GPL-2.0+
/*
* 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"
/* >= CEX3A: 4096 bits */
#define CEX3A_MAX_MOD_SIZE 512
/* CEX2A: max outputdatalength + type80_hdr */
#define CEX2A_MAX_RESPONSE_SIZE 0x110
/* >= CEX3A: 512 bit modulus, (max outputdatalength) + type80_hdr */
#define CEX3A_MAX_RESPONSE_SIZE 0x210
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 CEXxA cards.
*
* 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 CEXxA cards.
*
* 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->msg;
memset(meb1, 0, sizeof(*meb1));
ap_msg->len = 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->msg;
memset(meb2, 0, sizeof(*meb2));
ap_msg->len = 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->msg;
memset(meb3, 0, sizeof(*meb3));
ap_msg->len = 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;
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