221 lines
6.9 KiB
C
221 lines
6.9 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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* Copyright NXP 2018
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <trusty/hwcrypto.h>
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#include <trusty/rpmb.h>
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#include <trusty/trusty_ipc.h>
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#include <trusty/util.h>
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#include "common.h"
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#define LOCAL_LOG 0
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#define CAAM_KB_HEADER_LEN 48
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static bool initialized;
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static struct trusty_ipc_chan hwcrypto_chan;
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static int hwcrypto_send_request(struct hwcrypto_message *msg, void *req, size_t req_len)
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{
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struct trusty_ipc_iovec req_iovs[2] = {
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{ .base = msg, .len = sizeof(*msg) },
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{ .base = req, .len = req_len },
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};
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return trusty_ipc_send(&hwcrypto_chan, req_iovs, req ? 2 : 1, true);
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}
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static int hwcrypto_read_response(struct hwcrypto_message *msg, uint32_t cmd, void *resp,
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size_t resp_len)
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{
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int rc;
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struct trusty_ipc_iovec resp_iovs[2] = {
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{ .base = msg, .len = sizeof(*msg) },
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{ .base = resp, .len = resp_len },
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};
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rc = trusty_ipc_recv(&hwcrypto_chan, resp_iovs, resp ? 2 : 1, true);
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if (rc < 0) {
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trusty_error("failed (%d) to recv response\n", rc);
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return rc;
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}
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if (msg->cmd != (cmd | HWCRYPTO_RESP_BIT)) {
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trusty_error("malformed response\n");
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return TRUSTY_ERR_GENERIC;
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}
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/* return payload size */
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return rc - sizeof(*msg);
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}
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/*
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* Convenience function to send a request to the hwcrypto service and read the
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* response.
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*
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* @cmd: the command
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* @req: the request buffer
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* @req_size: size of the request buffer
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* @resp: the response buffer
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* @resp_size_p: pointer to the size of the response buffer. changed to the
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actual size of the response read from the secure side
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* @handle_rpmb: true if the request is expected to invoke RPMB callbacks
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*/
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static int hwcrypto_do_tipc(uint32_t cmd, void *req, uint32_t req_size, void *resp,
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uint32_t *resp_size_p, bool handle_rpmb)
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{
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int rc;
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struct hwcrypto_message msg = { .cmd = cmd };
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if (!initialized) {
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trusty_error("%s: HWCRYPTO TIPC client not initialized\n", __func__);
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return TRUSTY_ERR_GENERIC;
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}
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rc = hwcrypto_send_request(&msg, req, req_size);
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if (rc < 0) {
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trusty_error("%s: failed (%d) to send hwcrypto request\n", __func__, rc);
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return rc;
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}
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if (handle_rpmb) {
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/* handle any incoming RPMB requests */
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rc = rpmb_storage_proxy_poll();
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if (rc < 0) {
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trusty_error("%s: failed (%d) to get RPMB requests\n", __func__,
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rc);
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return rc;
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}
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}
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uint32_t resp_size = resp_size_p ? *resp_size_p : 0;
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rc = hwcrypto_read_response(&msg, cmd, resp, resp_size);
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if (rc < 0) {
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trusty_error("%s: failed (%d) to read HWCRYPTO response\n", __func__, rc);
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return rc;
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}
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/* change response size to actual response size */
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if (resp_size_p && rc != *resp_size_p) {
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*resp_size_p = rc;
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}
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if (msg.result != HWCRYPTO_ERROR_NONE) {
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trusty_error("%s: HWCRYPTO service returned error (%d)\n", __func__,
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msg.result);
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return TRUSTY_ERR_GENERIC;
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}
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return TRUSTY_ERR_NONE;
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}
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int hwcrypto_tipc_init(struct trusty_ipc_dev *dev)
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{
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int rc;
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trusty_assert(dev);
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trusty_assert(!initialized);
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trusty_ipc_chan_init(&hwcrypto_chan, dev);
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trusty_debug("Connecting to hwcrypto service\n");
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/* connect to hwcrypto service and wait for connect to complete */
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rc = trusty_ipc_connect(&hwcrypto_chan, HWCRYPTO_PORT, true);
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if (rc < 0) {
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trusty_error("failed (%d) to connect to '%s'\n", rc, HWCRYPTO_PORT);
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return rc;
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}
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/* mark as initialized */
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initialized = true;
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return TRUSTY_ERR_NONE;
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}
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void hwcrypto_tipc_shutdown(struct trusty_ipc_dev *dev)
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{
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if (!initialized)
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return; /* nothing to do */
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/* close channel */
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trusty_ipc_close(&hwcrypto_chan);
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initialized = false;
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}
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int hwcrypto_hash(uint32_t in_addr, uint32_t in_len, uint32_t out_addr,
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uint32_t out_len, enum hwcrypto_hash_algo algo)
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{
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hwcrypto_hash_msg req;
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unsigned long start, end;
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/* check the address */
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if (in_addr == 0 || out_addr == 0)
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return TRUSTY_ERR_INVALID_ARGS;
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/* fill the request buffer */
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req.in_addr = in_addr;
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req.out_addr = out_addr;
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req.in_len = in_len;
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req.out_len = out_len;
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req.algo = algo;
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/* flush dcache for input buffer */
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start = (unsigned long)in_addr & ~(ARCH_DMA_MINALIGN - 1);
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end = ALIGN((unsigned long)in_addr + in_len, ARCH_DMA_MINALIGN);
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flush_dcache_range(start, end);
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/* invalidate dcache for output buffer */
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start = (unsigned long)out_addr & ~(ARCH_DMA_MINALIGN - 1);
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end = ALIGN((unsigned long)out_addr + out_len, ARCH_DMA_MINALIGN);
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invalidate_dcache_range(start, end);
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int rc = hwcrypto_do_tipc(HWCRYPTO_HASH, (void*)&req,
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sizeof(req), NULL, 0, false);
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return rc;
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}
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int hwcrypto_gen_blob(uint32_t plain_pa,
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uint32_t plain_size, uint32_t blob_pa)
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{
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hwcrypto_blob_msg req;
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unsigned long start, end;
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/* check the address */
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if (plain_pa == 0 || blob_pa == 0)
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return TRUSTY_ERR_INVALID_ARGS;
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/* fill the request buffer */
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req.plain_pa = plain_pa;
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req.plain_size = plain_size;
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req.blob_pa = blob_pa;
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/* flush dcache for input buffer */
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start = (unsigned long)plain_pa & ~(ARCH_DMA_MINALIGN - 1);
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end = ALIGN((unsigned long)plain_pa + plain_size, ARCH_DMA_MINALIGN);
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flush_dcache_range(start, end);
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/* invalidate dcache for output buffer */
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start = (unsigned long)blob_pa & ~(ARCH_DMA_MINALIGN - 1);
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end = ALIGN((unsigned long)blob_pa + plain_size +
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CAAM_KB_HEADER_LEN, ARCH_DMA_MINALIGN);
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invalidate_dcache_range(start, end);
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int rc = hwcrypto_do_tipc(HWCRYPTO_ENCAP_BLOB, (void*)&req,
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sizeof(req), NULL, 0, false);
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return rc;
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}
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