518 lines
15 KiB
C
518 lines
15 KiB
C
/*
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* zcrypt 2.1.0
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*
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* Copyright IBM Corp. 2001, 2012
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* Author(s): Robert Burroughs
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* Eric Rossman (edrossma@us.ibm.com)
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*
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* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
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* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/atomic.h>
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#include <linux/uaccess.h>
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#include "ap_bus.h"
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#include "zcrypt_api.h"
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#include "zcrypt_error.h"
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#include "zcrypt_msgtype50.h"
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#define CEX3A_MAX_MOD_SIZE 512 /* 4096 bits */
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#define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */
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#define CEX3A_MAX_RESPONSE_SIZE 0x210 /* 512 bit modulus
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* (max outputdatalength) +
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* type80_hdr*/
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \
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"Copyright IBM Corp. 2001, 2012");
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MODULE_LICENSE("GPL");
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static void zcrypt_cex2a_receive(struct ap_device *, struct ap_message *,
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struct ap_message *);
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/**
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* The type 50 message family is associated with a CEX2A card.
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*
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* The four members of the family are described below.
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*
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* Note that all unsigned char arrays are right-justified and left-padded
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* with zeroes.
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*
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* Note that all reserved fields must be zeroes.
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*/
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struct type50_hdr {
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unsigned char reserved1;
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unsigned char msg_type_code; /* 0x50 */
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unsigned short msg_len;
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unsigned char reserved2;
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unsigned char ignored;
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unsigned short reserved3;
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} __packed;
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#define TYPE50_TYPE_CODE 0x50
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#define TYPE50_MEB1_FMT 0x0001
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#define TYPE50_MEB2_FMT 0x0002
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#define TYPE50_MEB3_FMT 0x0003
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#define TYPE50_CRB1_FMT 0x0011
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#define TYPE50_CRB2_FMT 0x0012
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#define TYPE50_CRB3_FMT 0x0013
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/* Mod-Exp, with a small modulus */
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struct type50_meb1_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0001 */
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unsigned char reserved[6];
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unsigned char exponent[128];
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unsigned char modulus[128];
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unsigned char message[128];
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} __packed;
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/* Mod-Exp, with a large modulus */
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struct type50_meb2_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0002 */
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unsigned char reserved[6];
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unsigned char exponent[256];
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unsigned char modulus[256];
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unsigned char message[256];
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} __packed;
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/* Mod-Exp, with a larger modulus */
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struct type50_meb3_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0003 */
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unsigned char reserved[6];
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unsigned char exponent[512];
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unsigned char modulus[512];
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unsigned char message[512];
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} __packed;
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/* CRT, with a small modulus */
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struct type50_crb1_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0011 */
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unsigned char reserved[6];
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unsigned char p[64];
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unsigned char q[64];
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unsigned char dp[64];
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unsigned char dq[64];
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unsigned char u[64];
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unsigned char message[128];
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} __packed;
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/* CRT, with a large modulus */
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struct type50_crb2_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0012 */
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unsigned char reserved[6];
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unsigned char p[128];
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unsigned char q[128];
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unsigned char dp[128];
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unsigned char dq[128];
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unsigned char u[128];
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unsigned char message[256];
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} __packed;
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/* CRT, with a larger modulus */
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struct type50_crb3_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0013 */
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unsigned char reserved[6];
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unsigned char p[256];
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unsigned char q[256];
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unsigned char dp[256];
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unsigned char dq[256];
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unsigned char u[256];
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unsigned char message[512];
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} __packed;
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/**
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* The type 80 response family is associated with a CEX2A card.
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*
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* Note that all unsigned char arrays are right-justified and left-padded
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* with zeroes.
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*
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* Note that all reserved fields must be zeroes.
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*/
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#define TYPE80_RSP_CODE 0x80
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struct type80_hdr {
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unsigned char reserved1;
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unsigned char type; /* 0x80 */
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unsigned short len;
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unsigned char code; /* 0x00 */
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unsigned char reserved2[3];
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unsigned char reserved3[8];
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} __packed;
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/**
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* Convert a ICAMEX message to a type50 MEX message.
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*
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* @zdev: crypto device pointer
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* @zreq: crypto request pointer
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* @mex: pointer to user input data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_device *zdev,
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struct ap_message *ap_msg,
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struct ica_rsa_modexpo *mex)
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{
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unsigned char *mod, *exp, *inp;
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int mod_len;
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mod_len = mex->inputdatalength;
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if (mod_len <= 128) {
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struct type50_meb1_msg *meb1 = ap_msg->message;
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memset(meb1, 0, sizeof(*meb1));
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ap_msg->length = sizeof(*meb1);
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meb1->header.msg_type_code = TYPE50_TYPE_CODE;
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meb1->header.msg_len = sizeof(*meb1);
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meb1->keyblock_type = TYPE50_MEB1_FMT;
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mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
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exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
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inp = meb1->message + sizeof(meb1->message) - mod_len;
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} else if (mod_len <= 256) {
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struct type50_meb2_msg *meb2 = ap_msg->message;
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memset(meb2, 0, sizeof(*meb2));
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ap_msg->length = sizeof(*meb2);
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meb2->header.msg_type_code = TYPE50_TYPE_CODE;
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meb2->header.msg_len = sizeof(*meb2);
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meb2->keyblock_type = TYPE50_MEB2_FMT;
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mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
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exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
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inp = meb2->message + sizeof(meb2->message) - mod_len;
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} else {
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/* mod_len > 256 = 4096 bit RSA Key */
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struct type50_meb3_msg *meb3 = ap_msg->message;
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memset(meb3, 0, sizeof(*meb3));
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ap_msg->length = sizeof(*meb3);
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meb3->header.msg_type_code = TYPE50_TYPE_CODE;
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meb3->header.msg_len = sizeof(*meb3);
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meb3->keyblock_type = TYPE50_MEB3_FMT;
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mod = meb3->modulus + sizeof(meb3->modulus) - mod_len;
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exp = meb3->exponent + sizeof(meb3->exponent) - mod_len;
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inp = meb3->message + sizeof(meb3->message) - mod_len;
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}
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if (copy_from_user(mod, mex->n_modulus, mod_len) ||
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copy_from_user(exp, mex->b_key, mod_len) ||
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copy_from_user(inp, mex->inputdata, mod_len))
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return -EFAULT;
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return 0;
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}
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/**
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* Convert a ICACRT message to a type50 CRT message.
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*
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* @zdev: crypto device pointer
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* @zreq: crypto request pointer
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* @crt: pointer to user input data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_device *zdev,
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struct ap_message *ap_msg,
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struct ica_rsa_modexpo_crt *crt)
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{
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int mod_len, short_len;
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unsigned char *p, *q, *dp, *dq, *u, *inp;
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mod_len = crt->inputdatalength;
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short_len = mod_len / 2;
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/*
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* CEX2A and CEX3A w/o FW update can handle requests up to
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* 256 byte modulus (2k keys).
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* CEX3A with FW update and CEX4A cards are able to handle
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* 512 byte modulus (4k keys).
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*/
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if (mod_len <= 128) { /* up to 1024 bit key size */
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struct type50_crb1_msg *crb1 = ap_msg->message;
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memset(crb1, 0, sizeof(*crb1));
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ap_msg->length = sizeof(*crb1);
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crb1->header.msg_type_code = TYPE50_TYPE_CODE;
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crb1->header.msg_len = sizeof(*crb1);
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crb1->keyblock_type = TYPE50_CRB1_FMT;
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p = crb1->p + sizeof(crb1->p) - short_len;
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q = crb1->q + sizeof(crb1->q) - short_len;
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dp = crb1->dp + sizeof(crb1->dp) - short_len;
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dq = crb1->dq + sizeof(crb1->dq) - short_len;
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u = crb1->u + sizeof(crb1->u) - short_len;
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inp = crb1->message + sizeof(crb1->message) - mod_len;
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} else if (mod_len <= 256) { /* up to 2048 bit key size */
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struct type50_crb2_msg *crb2 = ap_msg->message;
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memset(crb2, 0, sizeof(*crb2));
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ap_msg->length = sizeof(*crb2);
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crb2->header.msg_type_code = TYPE50_TYPE_CODE;
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crb2->header.msg_len = sizeof(*crb2);
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crb2->keyblock_type = TYPE50_CRB2_FMT;
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p = crb2->p + sizeof(crb2->p) - short_len;
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q = crb2->q + sizeof(crb2->q) - short_len;
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dp = crb2->dp + sizeof(crb2->dp) - short_len;
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dq = crb2->dq + sizeof(crb2->dq) - short_len;
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u = crb2->u + sizeof(crb2->u) - short_len;
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inp = crb2->message + sizeof(crb2->message) - mod_len;
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} else if ((mod_len <= 512) && /* up to 4096 bit key size */
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(zdev->max_mod_size == CEX3A_MAX_MOD_SIZE)) { /* >= CEX3A */
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struct type50_crb3_msg *crb3 = ap_msg->message;
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memset(crb3, 0, sizeof(*crb3));
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ap_msg->length = sizeof(*crb3);
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crb3->header.msg_type_code = TYPE50_TYPE_CODE;
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crb3->header.msg_len = sizeof(*crb3);
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crb3->keyblock_type = TYPE50_CRB3_FMT;
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p = crb3->p + sizeof(crb3->p) - short_len;
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q = crb3->q + sizeof(crb3->q) - short_len;
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dp = crb3->dp + sizeof(crb3->dp) - short_len;
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dq = crb3->dq + sizeof(crb3->dq) - short_len;
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u = crb3->u + sizeof(crb3->u) - short_len;
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inp = crb3->message + sizeof(crb3->message) - mod_len;
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} else
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return -EINVAL;
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/*
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* correct the offset of p, bp and mult_inv according zcrypt.h
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* block size right aligned (skip the first byte)
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*/
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if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) ||
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copy_from_user(q, crt->nq_prime, short_len) ||
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copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) ||
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copy_from_user(dq, crt->bq_key, short_len) ||
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copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) ||
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copy_from_user(inp, crt->inputdata, mod_len))
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return -EFAULT;
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return 0;
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}
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/**
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* Copy results from a type 80 reply message back to user space.
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*
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* @zdev: crypto device pointer
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* @reply: reply AP message.
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* @data: pointer to user output data
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* @length: size of user output data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int convert_type80(struct zcrypt_device *zdev,
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struct ap_message *reply,
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char __user *outputdata,
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unsigned int outputdatalength)
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{
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struct type80_hdr *t80h = reply->message;
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unsigned char *data;
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if (t80h->len < sizeof(*t80h) + outputdatalength) {
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/* The result is too short, the CEX2A card may not do that.. */
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zdev->online = 0;
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return -EAGAIN; /* repeat the request on a different device. */
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}
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if (zdev->user_space_type == ZCRYPT_CEX2A)
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BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
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else
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BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE);
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data = reply->message + t80h->len - outputdatalength;
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if (copy_to_user(outputdata, data, outputdatalength))
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return -EFAULT;
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return 0;
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}
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static int convert_response(struct zcrypt_device *zdev,
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struct ap_message *reply,
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char __user *outputdata,
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unsigned int outputdatalength)
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{
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/* Response type byte is the second byte in the response. */
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switch (((unsigned char *) reply->message)[1]) {
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case TYPE82_RSP_CODE:
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case TYPE88_RSP_CODE:
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return convert_error(zdev, reply);
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case TYPE80_RSP_CODE:
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return convert_type80(zdev, reply,
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outputdata, outputdatalength);
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default: /* Unknown response type, this should NEVER EVER happen */
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zdev->online = 0;
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return -EAGAIN; /* repeat the request on a different device. */
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}
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}
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/**
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* This function is called from the AP bus code after a crypto request
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* "msg" has finished with the reply message "reply".
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* It is called from tasklet context.
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* @ap_dev: pointer to the AP device
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* @msg: pointer to the AP message
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* @reply: pointer to the AP reply message
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*/
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static void zcrypt_cex2a_receive(struct ap_device *ap_dev,
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struct ap_message *msg,
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struct ap_message *reply)
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{
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static struct error_hdr error_reply = {
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.type = TYPE82_RSP_CODE,
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.reply_code = REP82_ERROR_MACHINE_FAILURE,
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};
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struct type80_hdr *t80h;
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int length;
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/* Copy the reply message to the request message buffer. */
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if (IS_ERR(reply)) {
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memcpy(msg->message, &error_reply, sizeof(error_reply));
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goto out;
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}
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t80h = reply->message;
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if (t80h->type == TYPE80_RSP_CODE) {
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if (ap_dev->device_type == AP_DEVICE_TYPE_CEX2A)
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length = min_t(int,
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CEX2A_MAX_RESPONSE_SIZE, t80h->len);
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else
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length = min_t(int,
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CEX3A_MAX_RESPONSE_SIZE, t80h->len);
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memcpy(msg->message, reply->message, length);
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} else
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memcpy(msg->message, reply->message, sizeof(error_reply));
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out:
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complete((struct completion *) msg->private);
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}
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static atomic_t zcrypt_step = ATOMIC_INIT(0);
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/**
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* The request distributor calls this function if it picked the CEX2A
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* device to handle a modexpo request.
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* @zdev: pointer to zcrypt_device structure that identifies the
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* CEX2A device to the request distributor
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* @mex: pointer to the modexpo request buffer
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*/
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static long zcrypt_cex2a_modexpo(struct zcrypt_device *zdev,
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struct ica_rsa_modexpo *mex)
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{
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struct ap_message ap_msg;
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struct completion work;
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int rc;
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ap_init_message(&ap_msg);
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if (zdev->user_space_type == ZCRYPT_CEX2A)
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ap_msg.message = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE,
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GFP_KERNEL);
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else
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ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE,
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GFP_KERNEL);
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if (!ap_msg.message)
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return -ENOMEM;
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ap_msg.receive = zcrypt_cex2a_receive;
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ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
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atomic_inc_return(&zcrypt_step);
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ap_msg.private = &work;
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rc = ICAMEX_msg_to_type50MEX_msg(zdev, &ap_msg, mex);
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if (rc)
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goto out_free;
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init_completion(&work);
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ap_queue_message(zdev->ap_dev, &ap_msg);
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rc = wait_for_completion_interruptible(&work);
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if (rc == 0)
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rc = convert_response(zdev, &ap_msg, mex->outputdata,
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mex->outputdatalength);
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else
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/* Signal pending. */
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ap_cancel_message(zdev->ap_dev, &ap_msg);
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out_free:
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kfree(ap_msg.message);
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return rc;
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}
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/**
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* The request distributor calls this function if it picked the CEX2A
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* device to handle a modexpo_crt request.
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* @zdev: pointer to zcrypt_device structure that identifies the
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* CEX2A device to the request distributor
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* @crt: pointer to the modexpoc_crt request buffer
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*/
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static long zcrypt_cex2a_modexpo_crt(struct zcrypt_device *zdev,
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struct ica_rsa_modexpo_crt *crt)
|
|
{
|
|
struct ap_message ap_msg;
|
|
struct completion work;
|
|
int rc;
|
|
|
|
ap_init_message(&ap_msg);
|
|
if (zdev->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(zdev, &ap_msg, crt);
|
|
if (rc)
|
|
goto out_free;
|
|
init_completion(&work);
|
|
ap_queue_message(zdev->ap_dev, &ap_msg);
|
|
rc = wait_for_completion_interruptible(&work);
|
|
if (rc == 0)
|
|
rc = convert_response(zdev, &ap_msg, crt->outputdata,
|
|
crt->outputdatalength);
|
|
else
|
|
/* Signal pending. */
|
|
ap_cancel_message(zdev->ap_dev, &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,
|
|
.variant = MSGTYPE50_VARIANT_DEFAULT,
|
|
};
|
|
|
|
int __init zcrypt_msgtype50_init(void)
|
|
{
|
|
zcrypt_msgtype_register(&zcrypt_msgtype50_ops);
|
|
return 0;
|
|
}
|
|
|
|
void __exit zcrypt_msgtype50_exit(void)
|
|
{
|
|
zcrypt_msgtype_unregister(&zcrypt_msgtype50_ops);
|
|
}
|
|
|
|
module_init(zcrypt_msgtype50_init);
|
|
module_exit(zcrypt_msgtype50_exit);
|