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Experimental USB TPM support using libusb and the LetsTrust TPM2Go US…
…B-Stick.
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| Original file line number | Diff line number | Diff line change |
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| /* tpm2_usb.c | ||
| * | ||
| * Copyright (C) 2006-2023 wolfSSL Inc. | ||
| * | ||
| * This file is part of wolfTPM. | ||
| * | ||
| * wolfTPM is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 2 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * wolfTPM is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA | ||
| */ | ||
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| #ifdef WOLFTPM_USB | ||
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| #include <wolftpm/tpm2_packet.h> | ||
| #include <wolftpm/tpm2_usb.h> | ||
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| #define VID_CYPRESS 0x04B4u | ||
| #define PID_CYUSBSPI 0x0004u | ||
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| #define CTRL_SET 0xC0u | ||
| #define CTRL_GET 0x40u | ||
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| #define CY_CMD_SPI 0xCAu | ||
| #define CY_CMD_GPIO_SET 0xDBu | ||
| #define CY_SPI_WRITEREAD 0x03u | ||
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| #define EP_OUT 0x01u | ||
| #define EP_IN 0x82u | ||
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| #define SPI_TIMEOUT 1000 | ||
| #define SPI_MAX_TRANSFER (4 + 64) | ||
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| static int TPM2_USB_Init(TPM2_CTX* ctx) | ||
| { | ||
| int ret; | ||
| int nb_ifaces = 0; | ||
| libusb_device *dev = NULL; | ||
| struct libusb_config_descriptor *conf_desc = NULL; | ||
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| if (ctx->usbCtx.dev_ctx != NULL) { | ||
| return 0; /* already initialized */ | ||
| } | ||
|
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| ret = libusb_init(&ctx->usbCtx.dev_ctx); | ||
| if (ret == 0) { | ||
| ctx->usbCtx.dev_handle = libusb_open_device_with_vid_pid(ctx->usbCtx.dev_ctx, | ||
| VID_CYPRESS, PID_CYUSBSPI); | ||
| if (ctx->usbCtx.dev_handle == NULL) { | ||
| ret = -1; | ||
| } | ||
| } | ||
| if (ret == 0) { | ||
| dev = libusb_get_device(ctx->usbCtx.dev_handle); | ||
| if (dev == NULL) { | ||
| ret = -1; | ||
| } | ||
| } | ||
| if (ret == 0) { | ||
| ret = libusb_get_config_descriptor(dev, 0, &conf_desc); | ||
| if (ret == 0) { | ||
| nb_ifaces = conf_desc->bNumInterfaces; | ||
| if (nb_ifaces <= 0) { | ||
| ret = -1; | ||
| } | ||
| libusb_free_config_descriptor(conf_desc); | ||
| } | ||
| } | ||
| if (ret == 0) { | ||
| ret = libusb_set_auto_detach_kernel_driver(ctx->usbCtx.dev_handle, 1); | ||
| } | ||
| if (ret == 0) { | ||
| ret = libusb_claim_interface(ctx->usbCtx.dev_handle, 0); | ||
| } | ||
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| ctx->usbCtx.spi_dma_buffer = libusb_dev_mem_alloc(ctx->usbCtx.dev_handle, SPI_MAX_TRANSFER); | ||
| /* failure to allocate DMA, means we will use the buffer directly */ | ||
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| if (ret != 0) { | ||
| TPM2_USB_Cleanup(ctx); | ||
| } | ||
| return ret; | ||
| } | ||
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| int TPM2_USB_SendCommand(TPM2_CTX* ctx, TPM2_Packet* packet) | ||
| { | ||
| int ret; | ||
| int act_len = 0; | ||
| int retry = 0; | ||
| int transferred = 0; | ||
| int length; | ||
| uint8_t* buffer; | ||
|
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| ret = TPM2_USB_Init(ctx); | ||
|
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| /* start transfer */ | ||
| if (ret == 0) { | ||
| length = packet->pos; | ||
| if (ctx->usbCtx.spi_dma_buffer != NULL && length < SPI_MAX_TRANSFER) { | ||
| buffer = ctx->usbCtx.spi_dma_buffer; | ||
| XMEMCPY(buffer, packet->buf, length); | ||
| } | ||
| else { | ||
| buffer = packet->buf; | ||
| } | ||
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| ret = libusb_control_transfer(ctx->usbCtx.dev_handle, CTRL_SET, CY_CMD_SPI, | ||
| CY_SPI_WRITEREAD, length, NULL, 0, SPI_TIMEOUT); | ||
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| /* do send */ | ||
| while (ret == 0 && transferred < length) { | ||
| ret = libusb_bulk_transfer(ctx->usbCtx.dev_handle, EP_OUT, | ||
| ctx->usbCtx.spi_dma_buffer + transferred, length, &act_len, SPI_TIMEOUT); | ||
| if (ret == 0) { | ||
| transferred += act_len; | ||
| length -= act_len; | ||
| } | ||
| } | ||
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| /* do receive */ | ||
| transferred = 0; | ||
| length = packet->pos; | ||
| while (ret == 0 && transferred < length) { | ||
| ret = libusb_bulk_transfer(ctx->usbCtx.dev_handle, EP_IN, | ||
| ctx->usbCtx.spi_dma_buffer + transferred, length, &act_len, SPI_TIMEOUT); | ||
| if (ret != 0) { | ||
| /* allow retry up to 5 times */ | ||
| if (retry++ > 5) { | ||
| ret = -1; | ||
| break; | ||
| } | ||
| continue; | ||
| } | ||
| transferred += act_len; | ||
| length -= act_len; | ||
| } | ||
| } | ||
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| return ret; | ||
| } | ||
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| int TPM2_USB_Cleanup(TPM2_CTX* ctx) | ||
| { | ||
| if (ctx->usbCtx.dev_handle != NULL) { | ||
| if (ctx->usbCtx.spi_dma_buffer != NULL) { | ||
| libusb_dev_mem_free(ctx->usbCtx.dev_handle, | ||
| ctx->usbCtx.spi_dma_buffer, SPI_MAX_TRANSFER); | ||
| } | ||
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| libusb_release_interface(ctx->usbCtx.dev_handle, 0); | ||
| libusb_close(ctx->usbCtx.dev_handle); | ||
| ctx->usbCtx.dev_handle = NULL; | ||
| } | ||
| if (ctx->usbCtx.dev_ctx != NULL) { | ||
| libusb_exit(ctx->usbCtx.dev_ctx); | ||
| ctx->usbCtx.dev_ctx = NULL; | ||
| } | ||
| return 0; | ||
| } | ||
|
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| #endif /* WOLFTPM_USB */ |
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