CN107437039B - Trusted platform control module based on ATX power supply and operation method thereof - Google Patents
Trusted platform control module based on ATX power supply and operation method thereof Download PDFInfo
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- CN107437039B CN107437039B CN201610361551.XA CN201610361551A CN107437039B CN 107437039 B CN107437039 B CN 107437039B CN 201610361551 A CN201610361551 A CN 201610361551A CN 107437039 B CN107437039 B CN 107437039B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/81—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer by operating on the power supply, e.g. enabling or disabling power-on, sleep or resume operations
Abstract
The application relates to a trusted platform control module based on an ATX power supply, which comprises: a timing control unit connected to the ATX power supply, wherein a standby voltage (5 VSB) is provided to the timing control unit by the ATX power supply as an operating voltage of the trusted platform control module, and the timing control unit is configured to instruct the ATX power supply to power up the ATX power supply module of the computer main board upon receiving a power-up signal from the SPI main controller; and an SPI main controller connected with and supplying power to the BIOS flash memory of the computer motherboard through an SPI bus, wherein the SPI main controller is configured to read the BIOS code from the BIOS flash memory after the trusted platform control module is powered on, generate a hash value of the BIOS code, compare the hash value with a reference hash value and send a power-on signal to the time sequence control unit if the hash value is consistent with the reference hash value. The application also relates to a method for operating the module.
Description
Technical Field
The present application relates generally to the field of information security, and more particularly, to an ATX power supply-based trusted platform control module and a method of operating the same.
Background
A trusted platform module (Trusted Platform Module, TPM) is a hardware device that interfaces with a computer motherboard for verifying identity and handling variables used by a computer in a trusted computing environment. The TPM and the data stored therein are typically separate from all other components of the computer.
The trusted platform module in the prior art is a separate module at the control of the motherboard, so that it cannot guarantee the integrity of the BIOS code of the motherboard itself. However, today, the BIOS code of the motherboard is more and more vulnerable to attack and tampering, and the conventional TPM cannot guarantee the credibility of the computer platform.
In recent years trusted platform control modules (Trusted Platform Control Module, TPCM) have been disclosed in the prior art, checking the trustworthiness of BIOS code, one such TPCM being disclosed in chinese patent application CN 200810115280.5. However, in the TPCM, the TPCM and the whole BIOS circuit need to be powered on at the same time, which brings about a potential safety hazard, because when the whole BIOS circuit is powered on, electric energy may flow backward to other hardware devices on the motherboard, so that the credibility of the platform may be damaged by tampering with codes in the BIOS circuit; in view of this, in this TPCM, after the TPCM and the entire BIOS circuit are powered on, it is necessary to check the current use state of other hardware resources on the motherboard, i.e., the power-on condition, which in turn increases the complexity and cost of the trusted control process. In addition, when the entire BIOS circuit is powered on, the computer south bridge device will likely be in an operational state, thereby potentially interfering with the access of the TPCM SPI master to the flash memory. In addition, the existing TPCM is generally integrated on the motherboard and the circuitry of the motherboard must be modified, resulting in increased installation costs or hardware costs.
Disclosure of Invention
The application aims to provide a trusted platform control module based on an ATX power supply and an operation method thereof, and by using the trusted platform control module or the method, the reliability of establishing a trusted platform can be improved, and the installation cost and the hardware cost can be reduced at the same time.
In a first aspect of the application, the object is achieved by a trusted platform control module based on an ATX power supply, comprising:
a timing control unit connected to the ATX power supply, wherein a standby voltage (5 VSB) is provided to the timing control unit by the ATX power supply as an operating voltage of the trusted platform control module, and the timing control unit is configured to instruct the ATX power supply to power up the ATX power supply module of the computer main board upon receiving a power-up signal from the SPI main controller; and
and the SPI main controller is connected with the BIOS flash memory of the computer main board through an SPI bus and supplies power to the BIOS flash memory, and is configured to read BIOS codes from the BIOS flash memory after the trusted platform control module is powered on, generate hash values of the BIOS codes, compare the hash values with reference hash values and send power-on signals to the time sequence control unit when the hash values are consistent with the reference hash values.
By means of the ATX power supply based trusted platform control module TPCM according to the application at least the following advantages are achieved: (1) The SPI main controller of the TPCM independently supplies power to the BIOS flash memory through the SPI (SeriaI Peripheral Interface, serial peripheral interface) bus, so that the TPCM can be electrified before the BIOS flash memory, and because only the BIOS flash memory is independently powered but not the whole BIOS circuit is powered, the false electrification of other untrusted hardware devices caused by the reverse flow of electric energy from the BIOS circuit to other hardware devices can be effectively prevented, thereby improving the reliability of the realization trusted platform; (2) The TPCM according to the present application mainly expands the functions of the ATX power supply to control the power-on process of the power supply to the motherboard, that is, the TPCM according to the present application mainly interacts with the ATX power supply, so that no modification of the motherboard is required, and no integration on the motherboard is required, but instead, the TPCM according to the present application can be easily implemented as an external device or integrated with the power supply, thereby reducing the installation cost and the hardware cost.
It should be noted herein that the term "computer" in the present application should be construed broadly to cover electronic devices such as servers, desktop computers, laptop computers, personal digital assistants, tablet computers, smart terminals, etc., as long as such electronic devices support an ATX power supply.
In one embodiment of the application, the timing control unit is connected to a timing control circuit of the ATX power supply and, when a power-on signal is received from the SPI master controller, instructs the timing control circuit to power up the ATX power supply module of the computer motherboard. By the aid of the expansion scheme, the power-on process of the ATX power supply to the computer main board can be easily controlled by the TPCM.
In a preferred embodiment of the present application, the BIOS code is a key code among BIOS codes stored in the BIOS flash memory. With this preferred scheme, the calculation amount or calculation time of the hash value calculation can be reduced without significantly reducing the security. The critical BIOS code may be, for example, core code that involves powering up of the hardware devices.
In another preferred embodiment of the present application, the timing control unit is further configured to:
instructing an ATX power supply to supply a standby voltage (5 VSB) to an ATX power supply module of a computer main board upon receiving a power-on signal from an SPI main controller and releasing a lock on a PW-OK signal, and
and after receiving the PS-ON signal from the ATX power supply module, sending the PS-ON signal to the ATX power supply so as to enable the computer main board to enter an operation state.
By the preferred scheme, the power-on control of the main board can be easily realized by controlling the time sequence signal of the ATX power supply, and the main board is not required to be changed.
In a further preferred embodiment of the application, a diode is provided in the connection in the BIOS circuit for supplying the BIOS flash memory with power for unidirectional supply of the BIOS flash memory. By the scheme, the one-way power supply for the BIOS flash memory can be realized at low cost, so that electric energy is better prevented from flowing backwards from the BIOS flash memory to other hardware equipment.
In a second aspect of the application, the aforementioned task is solved by an ATX power extension having an ATX power based trusted platform control module according to the application. By means of the extension line, the trusted platform can be easily constructed without changing the main board. It should be noted, however, that while the ATX power-based trusted platform control module is implemented herein as a power extension, it may be implemented in other ways as a separate component and connected to the computer in other ways.
In a third aspect of the present application, the foregoing task is solved by a method for operating an ATX power supply based trusted platform control module, comprising the steps of:
providing a standby voltage (5 VSB) by an ATX power supply to a timing control unit of the trusted platform control module to power up the trusted platform control module;
the SPI main controller of the trusted platform control module supplies power to the BIOS flash memory of the computer main board through an SPI bus and reads BIOS codes from the BIOS flash memory;
generating, by the SPI master controller, a hash value of the BIOS code;
comparing, by the SPI master controller, the hash value with a reference hash value and transmitting a power-on signal to the timing control unit if the hash value coincides with the reference hash value; and
the time sequence control unit sends a control signal to the ATX power supply to instruct the ATX power supply to power up the ATX power supply module of the computer main board.
With the method according to the application the above-mentioned advantages, namely improved reliability of implementing a trusted platform and reduced installation costs and hardware costs, can also be achieved as with the trusted platform control module according to the application.
In a preferred embodiment of the present application, the BIOS code is a key code among BIOS codes stored in the BIOS flash memory. With this preferred scheme, the calculation amount or calculation time of the hash value calculation can be reduced without significantly reducing the security. The critical BIOS code may be, for example, core code that involves powering up of the hardware devices.
In another preferred embodiment of the present application, it is provided that the transmission of the control signal by the timing control unit to the ATX power module comprises the following steps:
transmitting a control signal to the ATX power by the timing control unit to supply a standby voltage (5 VSB) to an ATX power module of the computer main board 106 by the ATX power and to unlock the PW-OK signal; and
after the timing control unit receives the PS-ON signal from the ATX power supply module, the timing control unit sends the PS-ON signal to the ATX power supply so as to enable the computer main board to enter an operation state.
By the preferred scheme, the power-on control of the main board can be easily realized by controlling the time sequence signal of the ATX power supply, and the main board is not required to be changed.
Drawings
The application will be further elucidated with reference to a specific embodiment in conjunction with the drawings.
FIG. 1 illustrates a block diagram of a system environment for an ATX power supply based trusted platform control module in accordance with the present application; and
fig. 2 shows a flow of a method for operating an ATX power supply based trusted platform control module according to the present application.
Detailed Description
Fig. 1 shows a block diagram of the system environment of an ATX power supply based trusted platform control module 100 according to the present application.
The system environment in fig. 1 includes a power grid 104, an ATX power supply 103, a computer motherboard 106, and a trusted platform control module 100. It should be noted that in this block diagram, other components not related to the inventive concept are omitted for simplicity.
The grid 104 is used to supply the ATX power 103, and the grid 104 is, for example, a 220V ac grid. It should be noted that although the system environment here comprises an electrical grid, in other embodiments the system environment may also comprise other power supply devices, such as a battery.
The ATX power supply 103 is configured to obtain electrical energy from the power grid 104 and supply it to the trusted platform control module 100 and the computer motherboard 106, and convert the electrical energy, such as ac-dc conversion, or current or voltage conversion, as necessary. The ATX power supply 103 may include a timing control circuit 105 configured to transmit and receive timing signals for power up.
The computer motherboard 106 includes an ATX power module 107 and BIOS flash memory. The ATX power module 107 is configured to receive a timing signal from the timing control circuit 105 to power up the computer motherboard 106. The BIOS flash 108 stores BIOS code, which is used for, for example, the bottommost hardware control.
The trusted platform module 100 according to the present application comprises a timing control unit 101 and an SPI master controller 102.
The timing control unit 101 is connected to an ATX power supply 103, wherein a standby voltage (5 VSB) 110 is provided by the ATX power supply 103 to the timing control unit 101 as an operating voltage of the trusted platform control module 100. The standby voltage 110 is, for example, a 5V dc voltage. The timing control unit 101 is configured to instruct the ATX power supply 103 to power up the ATX power supply module 107 of the computer motherboard 106 upon receiving a power-up signal from the SPI main controller 102. For example, the timing control unit 101 may be connected to the timing control circuit 105 of the ATX power supply 103 and obtain the standby voltage 110 from the timing control circuit 105, and the ATX power supply module 107 receives the power-on signal from the timing control circuit 105.
SPI master controller 102 is coupled to BIOS flash memory 108 via SPI bus 109 and provides power only to BIOS flash memory 108, for example, at a 3.3V DC voltage. In one embodiment, a diode may be provided in the connection in the BIOS circuit that provides power to the BIOS flash memory for unidirectional power to the BIOS flash memory, wherein by the unidirectional power, power may be better prevented from flowing backward from the BIOS flash memory to other hardware devices. The SPI master controller 102 is configured to read a BIOS code from the BIOS flash memory 108 after the trusted platform control module 100 is powered up and generate a hash value of the BIOS code and compare the hash value with a reference hash value and send a power-on signal to the timing control unit 101 if the hash value is consistent with the reference hash value. Here, the BIOS code may be a key code among BIOS codes stored in the BIOS flash memory, for example, a BIOS code for controlling power-up of each hardware. Of course other BIOS critical code, such as BIOS code relating to system security, are also contemplated.
It should be noted that timing control unit 101 and SPI master controller may be implemented by programming a processor or microcontroller, or may be implemented as a Field Programmable Gate Array (FPGA) or Application Specific Integrated Circuit (ASIC).
With the ATX power supply based trusted platform control module TPCM 100 according to the present application, at least the following advantages can be achieved: (1) By independently powering the BIOS flash memory 108 via the SPI bus 109 by the SPI master controller 102 of the TPCM 100, the TPCM 100 can be powered on before the BIOS flash memory 108, and since only the BIOS flash memory 108 is independently powered, but not the entire BIOS circuit is powered, the false powering on of other untrusted hardware devices caused by preventing the reverse flow of electrical energy from the BIOS circuit to other hardware devices can be effectively prevented, thereby improving the reliability of implementing a trusted platform; (2) The TPCM 100 according to the present application mainly expands the functions of the ATX power supply 103 to control the power-up process of the ATX power supply to the motherboard 106, that is, the TPCM 100 according to the present application mainly interacts with the ATX power supply 103, so that no modification of the motherboard is required, and no integration on the motherboard is required, but instead, the TPCM 100 according to the present application can be easily implemented as an external device or integrated with the power supply, thereby reducing installation costs and hardware costs.
Fig. 2 illustrates a flow of a method 200 for operating an ATX power supply based trusted platform control module in accordance with the present application.
At step 202, a standby voltage (5 VSB) 110 is provided by the ATX power supply 103 to the timing control unit 101 of the trusted platform control module 100 to power up the trusted platform control module 100. The ATX power supply 103 is connected to, for example, a power grid 104 to obtain electric power.
In step 204, the BIOS flash memory 108 of the computer motherboard 106 is powered by the SPI master controller 102 of the trusted platform control module 100 via the SPI bus 109 and BIOS code is read from the BIOS flash memory 108. The power supply voltage is, for example, 3.3V dc voltage, and the BIOS code is, for example, a key code.
At step 206, a hash value of the BIOS code is generated by SPI master controller 102. The BIOS code may be critical BIOS code. The generation of the hash value may be performed according to prior art methods.
In step 208, the hash value is compared with a reference hash value by the SPI master controller 102 and a power-on signal is sent to the timing control unit 101 if the hash value coincides with the reference hash value.
In step 210, the timing control unit 101 sends a control signal to the ATX power supply 103 to instruct the ATX power supply 103 to power up the ATX power supply module 107 of the computer motherboard. Step 210 may alternatively be implemented by:
transmitting a control signal to the ATX power supply 103 by the timing control unit 101 to supply a standby voltage (5 VSB) to the ATX power supply module 107 of the computer main board 106 by the ATX power supply 103, and unlocking the PW-OK signal; and
after the timing control unit 101 receives the PS-ON signal from the ATX power module 107, the PS-ON signal is sent by the timing control unit 101 to the ATX power 103 to bring the computer motherboard 106 into an operating state.
After the ATX power module 107 is powered up, the various hardware on the motherboard is powered as in the prior art and the computer is booted and started.
While certain embodiments of the present application have been described in this document, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous variations, alternatives, and modifications will occur to those skilled in the art without departing from the scope of the application. The appended claims are intended to define the scope of the application and to cover such methods and structures within the scope of these claims themselves and their equivalents.
Claims (9)
1. A trusted platform control module based on an ATX power supply, comprising:
a timing control unit connected to the ATX power supply, wherein the timing control unit is supplied with a standby voltage 5VSB by the ATX power supply as an operating voltage of the trusted platform control module, and the timing control unit is configured to instruct the ATX power supply to power up the ATX power supply module of the computer motherboard upon receiving a power-up signal from the SPI main controller; and
and the SPI main controller is connected with the BIOS flash memory of the computer main board through an SPI bus and supplies power to the BIOS flash memory, and is configured to read BIOS codes from the BIOS flash memory after the trusted platform control module is powered on, generate hash values of the BIOS codes, compare the hash values with reference hash values and send power-on signals to the time sequence control unit when the hash values are consistent with the reference hash values.
2. The ATX power-based trusted platform control module of claim 1, wherein said timing control unit is connected to a timing control circuit of the ATX power source and instructs said timing control circuit to power up the ATX power module of the computer motherboard upon receiving a power-up signal from the SPI master controller.
3. The ATX power supply based trusted platform control module of claim 1, wherein said BIOS code is a key code in BIOS code stored in BIOS flash.
4. The ATX power supply based trusted platform control module of claim 1, wherein said timing control unit is further configured to:
instructing the ATX power supply to supply the standby voltage 5VSB to the ATX power supply module of the computer main board upon receiving the power-on signal from the SPI main controller and releasing the lock on the PW-OK signal, and
and after receiving the PS-ON signal from the ATX power supply module, sending the PS-ON signal to the ATX power supply so as to enable the computer main board to enter an operation state.
5. The ATX power supply based trusted platform control module of claim 1 wherein a diode is provided in a connection in the BIOS circuit to power the BIOS flash for unidirectional power supply to the BIOS flash.
6. An ATX power extension cord having an ATX power based trusted platform control module according to one of claims 1 to 5.
7. A method for operating an ATX power supply based trusted platform control module, comprising the steps of:
providing standby voltage 5VSB by ATX power supply to time sequence control unit of the trusted platform control module to power up the trusted platform control module;
the SPI main controller of the trusted platform control module supplies power to the BIOS flash memory of the computer main board through an SPI bus and reads BIOS codes from the BIOS flash memory;
generating, by the SPI master controller, a hash value of the BIOS code;
comparing, by the SPI master controller, the hash value with a reference hash value and transmitting a power-on signal to the timing control unit if the hash value coincides with the reference hash value; and
the time sequence control unit sends a control signal to the ATX power supply to instruct the ATX power supply to power up the ATX power supply module of the computer main board.
8. The method of claim 7, wherein the BIOS code is a key code in a BIOS code stored in a BIOS flash memory.
9. The method of claim 7, wherein transmitting, by the timing control unit, the control signal to the ATX power module comprises:
transmitting a control signal to an ATX power supply by a timing control unit to supply a standby voltage 5VSB to an ATX power supply module of a computer main board (106) by the ATX power supply and to unlock a PW-OK signal; and
after the timing control unit receives the PS-ON signal from the ATX power supply module, the timing control unit sends the PS-ON signal to the ATX power supply so as to enable the computer main board to enter an operation state.
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| CN201610361551.XA CN107437039B (en) | 2016-05-27 | 2016-05-27 | Trusted platform control module based on ATX power supply and operation method thereof |
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