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path: root/drivers/s390/crypto/zcrypt_msgtype50.c
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Diffstat (limited to 'drivers/s390/crypto/zcrypt_msgtype50.c')
-rw-r--r--drivers/s390/crypto/zcrypt_msgtype50.c580
1 files changed, 580 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_msgtype50.c b/drivers/s390/crypto/zcrypt_msgtype50.c
new file mode 100644
index 000000000..7d245645f
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_msgtype50.c
@@ -0,0 +1,580 @@
+// 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;
+
+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;
+}
+
+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;
+ 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;
+
+#ifdef CONFIG_ZCRYPT_DEBUG
+ if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL)
+ ap_msg->flags ^= AP_MSG_FLAG_SPECIAL;
+#endif
+
+ 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 newer CEXxA 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->msg;
+
+ memset(crb1, 0, sizeof(*crb1));
+ ap_msg->len = 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->msg;
+
+ memset(crb2, 0, sizeof(*crb2));
+ ap_msg->len = 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->msg;
+
+ memset(crb3, 0, sizeof(*crb3));
+ ap_msg->len = 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;
+
+#ifdef CONFIG_ZCRYPT_DEBUG
+ if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL)
+ ap_msg->flags ^= AP_MSG_FLAG_SPECIAL;
+#endif
+
+ 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->msg;
+ unsigned char *data;
+
+ if (t80h->len < sizeof(*t80h) + outputdatalength) {
+ /* The result is too short, the CEXxA card may not do that.. */
+ zq->online = 0;
+ pr_err("Crypto dev=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n",
+ AP_QID_CARD(zq->queue->qid),
+ AP_QID_QUEUE(zq->queue->qid), t80h->code);
+ ZCRYPT_DBF_ERR("%s dev=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n",
+ __func__, AP_QID_CARD(zq->queue->qid),
+ AP_QID_QUEUE(zq->queue->qid), t80h->code);
+ ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
+ return -EAGAIN;
+ }
+ 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->msg + t80h->len - outputdatalength;
+ if (copy_to_user(outputdata, data, outputdatalength))
+ return -EFAULT;
+ return 0;
+}
+
+static int convert_response_cex2a(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->msg)[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("Crypto dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
+ AP_QID_CARD(zq->queue->qid),
+ AP_QID_QUEUE(zq->queue->qid),
+ (int)rtype);
+ ZCRYPT_DBF_ERR(
+ "%s dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
+ __func__, AP_QID_CARD(zq->queue->qid),
+ AP_QID_QUEUE(zq->queue->qid), (int)rtype);
+ ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
+ return -EAGAIN;
+ }
+}
+
+/*
+ * 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 len;
+
+ /* Copy the reply message to the request message buffer. */
+ if (!reply)
+ goto out; /* ap_msg->rc indicates the error */
+ t80h = reply->msg;
+ if (t80h->type == TYPE80_RSP_CODE) {
+ len = t80h->len;
+ if (len > reply->bufsize || len > msg->bufsize) {
+ msg->rc = -EMSGSIZE;
+ } else {
+ memcpy(msg->msg, reply->msg, len);
+ msg->len = len;
+ }
+ } else {
+ memcpy(msg->msg, reply->msg, 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 CEXxA
+ * device to handle a modexpo request.
+ * @zq: pointer to zcrypt_queue structure that identifies the
+ * CEXxA 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_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ?
+ MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE;
+ ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
+ if (!ap_msg->msg)
+ 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;
+ init_completion(&work);
+ rc = ap_queue_message(zq->queue, ap_msg);
+ if (rc)
+ goto out;
+ rc = wait_for_completion_interruptible(&work);
+ if (rc == 0) {
+ rc = ap_msg->rc;
+ if (rc == 0)
+ rc = convert_response_cex2a(zq, ap_msg,
+ mex->outputdata,
+ mex->outputdatalength);
+ } else {
+ /* Signal pending. */
+ ap_cancel_message(zq->queue, ap_msg);
+ }
+
+out:
+ ap_msg->private = NULL;
+ if (rc)
+ ZCRYPT_DBF_DBG("%s send me cprb at dev=%02x.%04x rc=%d\n",
+ __func__, AP_QID_CARD(zq->queue->qid),
+ AP_QID_QUEUE(zq->queue->qid), rc);
+ return rc;
+}
+
+/*
+ * The request distributor calls this function if it picked the CEXxA
+ * device to handle a modexpo_crt request.
+ * @zq: pointer to zcrypt_queue structure that identifies the
+ * CEXxA 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_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ?
+ MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE;
+ ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
+ if (!ap_msg->msg)
+ 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;
+ init_completion(&work);
+ rc = ap_queue_message(zq->queue, ap_msg);
+ if (rc)
+ goto out;
+ rc = wait_for_completion_interruptible(&work);
+ if (rc == 0) {
+ rc = ap_msg->rc;
+ if (rc == 0)
+ rc = convert_response_cex2a(zq, ap_msg,
+ crt->outputdata,
+ crt->outputdatalength);
+ } else {
+ /* Signal pending. */
+ ap_cancel_message(zq->queue, ap_msg);
+ }
+
+out:
+ ap_msg->private = NULL;
+ if (rc)
+ ZCRYPT_DBF_DBG("%s send crt cprb at dev=%02x.%04x rc=%d\n",
+ __func__, AP_QID_CARD(zq->queue->qid),
+ AP_QID_QUEUE(zq->queue->qid), rc);
+ 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-30 21:14:49 +0000