CN103164789A - Debug circuit structure provided with safety verification and achieving method of debug circuit structure provided with safety verification - Google Patents
Debug circuit structure provided with safety verification and achieving method of debug circuit structure provided with safety verification Download PDFInfo
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- CN103164789A CN103164789A CN2013100726165A CN201310072616A CN103164789A CN 103164789 A CN103164789 A CN 103164789A CN 2013100726165 A CN2013100726165 A CN 2013100726165A CN 201310072616 A CN201310072616 A CN 201310072616A CN 103164789 A CN103164789 A CN 103164789A
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Abstract
The invention provides a debug circuit structure provided with safety verification. The debug circuit structure provided with safety verification comprises a debug access switching circuit, a safety check verification circuit and an Efuse secret key storage module. The Efuse secret key storage module stores secret key data, the safety check verification circuit performs verification, and the debug access switching circuit controls connection or non-connection of a debug interface and a chip internal circuit according to verification results. The invention further provides an achieving method of the debug circuit structure provided with safety verification, firstly the secret key data are written in the Efuse secret key storage module, an initial value is written into the safety check verification circuit, then the safety check verification circuit is utilized to perform verification, and the debug access switching circuit controls connection or non-connection of the debug interface and the chip internal circuit according to verification results. The invention achieves double secure through secret allocation addresses and the secret data, improves security, and is small in circuit consuming resources and low in increased chip cost.
Description
Technical field
The present invention relates to a kind of debug circuit structure and its implementation with safety check.
Background technology
Along with payment function and other application that relate to privacy of handheld device are more and more extensive, the user also pays close attention to all the more the security of data on handheld device.The debug interface all needs the debugging interface that possesses as any chip, exist by the possibility of unauthorized person for detection of private data on user's handheld device.And in the application chip of present large-scale handheld device, the debug interface is all the data that can directly connect and carry out in debug action visiting application chip usually, prior art also can't stop illegal debug behavior, therefore, extremely need to design a kind of circuit that can stop illegal debug behavior, it all is significant for the security that improves the use of user's payment function and the confidentiality of individual privacy data.
Summary of the invention
One of the technical problem to be solved in the present invention, be to provide a kind of debug circuit structure with safety check, its solved current anyone can carry out to the application chip of handheld device the problem of direct debug, strengthened the security of handheld device, and the circuit consumes resources is few, and the chip cost of increase is little.
The present invention is one of technical solution problem by the following technical programs:
Technical scheme one:
A kind of debug circuit structure with safety check, described debug circuit structure comprises debug access switch circuit, safety inspection checking circuit and Efuse key storage module;
Described Efuse key storage module storage key data;
Described safety inspection checking circuit is write action address and cipher key content by what the debug interface received the user, and verification described write the action address whether be whether cipher key configuration address and described cipher key content consistent with key data, then check results is sent to described debug access switch circuit; Only have the user write the action address be that cipher key configuration address and cipher key content are consistent with key data, the safety inspection checking circuit is sent the consistent check results of verification, otherwise, send the inconsistent check results of verification; Described safety inspection checking circuit reads key data from Efuse key storage module, and key data and cipher key content are compared, and judges whether consistent;
Whether described debug access switch circuit is responsible for receiving the check results of described safety inspection checking circuit, and be connected with the chip internal circuit according to check results control debug interface.
Further, described safety inspection checking circuit specifically comprises interconnective address check module, cipher key storage block to be verified and data comparison module, and described address check module is connected with described debug interface;
Described address check module be responsible for verified users write the action address whether be the cipher key configuration address, if described cipher key content is write described cipher key storage block to be verified;
Described cipher key storage block to be verified is used for storing described cipher key content;
Described data comparison module reads cipher key content and key data and cipher key content and key data is compared from cipher key storage block to be verified and Efuse key storage module respectively, judge whether unanimously then check results to be delivered to described debug access switch circuit.
Two of the technical problem to be solved in the present invention, be to provide a kind of implementation method of the debug circuit structure with safety check, its solved current anyone can carry out to the application chip of handheld device the problem of direct debug, strengthened the security of handheld device, and the circuit consumes resources is few, increases chip cost little.
The present invention by the following technical programs two technical solution problems two:
Technical scheme two:
A kind of implementation method of the debug circuit structure with safety check comprises the steps:
Step 1, key data is write an Efuse key storage module;
Step 2, initial value is write a safety inspection checking circuit, described initial value be one with the different value of described key data;
Step 3, described safety inspection checking circuit are write action address and cipher key content by what the debug interface received the user, and verification described write the action address whether be the cipher key configuration address, if, the safety inspection checking circuit reads key data from described Efuse key storage module, key data and cipher key content are compared, then check results is delivered to a debug access switch circuit;
Whether step 4, described debug access switch circuit are controlled the debug interface according to check results and are connected with the chip internal circuit, if receive the check results that verification is consistent, the debug interface are connected the normal operation of debug interface to the path of chip internal circuit; If receive the inconsistent check results of verification, the path of debug interface to the chip internal circuit disconnected, make the debug interface can't carry out the debug operation, unauthorized person can't be known cipher key configuration address and key data, also just can't with handheld device in the direct debug of application chip, can't visit the data in chip, thereby strengthen the confidentiality of data in the security of handheld device and handheld device.
Further, described safety inspection checking circuit specifically comprises interconnective address check module, cipher key storage block to be verified and data comparison module, and described address check module is connected with described debug interface;
Described step 2 is specially: initial value is write the cipher key storage block to be verified of safety inspection checking circuit, described initial value is one and the different value of described key data;
Described step 3 is specially: described address check module is write action address and cipher key content by what the debug interface received the user, at first verified users write the action address whether be the cipher key configuration address, if described cipher key content is write described cipher key storage block to be verified;
Described data comparison module reads cipher key content and key data and cipher key content and key data is compared from cipher key storage block to be verified and Efuse key storage module respectively, judge whether unanimously then check results to be delivered to described debug access switch circuit.
The present invention has following advantage:
the invention solves current anyone can carry out to the application chip of handheld device the problem of direct debug, by in Efuse key storage mould storage key data, write action address and cipher key content by safety inspection checking circuit inspection user, when verification is consistent, debug access switch circuit is connected the debug interface to the path of chip internal circuit, otherwise, disconnect, because the chip production business directly pays the competent person with cipher key configuration address and key data, therefore unauthorized person can't directly carry out the debug connection, thereby realized the double-security of handheld device, greatly strengthened the security of handheld device, and circuit structure of the present invention is simple, consumes resources is few, the chip cost that increases is little.
Description of drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the schematic diagram of a kind of debug circuit structure with safety check of the present invention.
Fig. 2 is the detailed construction schematic diagram of a kind of debug circuit structure with safety check of the present invention.
Fig. 3 is the implementation method process flow diagram of a kind of debug circuit structure with safety check of the present invention.
Embodiment
Technical scheme one:
See also illustrated in figures 1 and 2ly, a preferred embodiment of the present invention is described in detail.
A kind of debug circuit structure with safety check, described debug circuit structure comprises debug access switch circuit, safety inspection checking circuit and Efuse key storage module; Described debug access switch circuit and safety inspection checking circuit are connected with external unit (as computing machine) by the debug interface, described safety inspection checking circuit also connects described debug access switch circuit, described debug access switch circuit is connected with the chip internal circuit, and described Efuse key storage module connects described safety inspection checking circuit; Described chip is for being located at handheld device inside.
Described Efuse key storage module storage key data; Described key data is generally in the chip production process, and Efuse key storage module is carried out write operation, and key data is write.Because Efuse key storage module is resistance fuse programmed circuit, be different from the SRAM array that most of FPGA use, Efuse once only has a fuse to be programmed, in case programming, data can not change, after therefore key data being write, and not erasable or change.
Described safety inspection checking circuit is write action address and cipher key content by what the debug interface received the user, and verification described write the action address whether be whether cipher key configuration address and described cipher key content consistent with key data, then check results is sent to described debug access switch circuit; Only have the user write the action address be that cipher key configuration address and cipher key content are consistent with key data, the safety inspection checking circuit is sent the consistent check results of verification, otherwise, send the inconsistent check results of verification; Described safety inspection checking circuit reads key data from Efuse key storage module, and key data and cipher key content are compared, and judges whether consistent;
in the present embodiment, described safety inspection checking circuit specifically comprises interconnective address check module, cipher key storage block to be verified and data comparison module, and described address check module is connected with described debug interface, in the chip production process, write an initial value in the cipher key storage block to be verified of safety inspection checking circuit, described initial value is one and the different value of described key data, purpose is: in the chip operation process, use the debug interface that PC is connected with chip, initial value under original state in cipher key storage block to be verified be one with Efuse key storage module in different value, must make so the inconsistent result of safety inspection checking circuit output verification, and control debug access switch circuit is in off-state, make the debug process to carry out,
Described address check module be responsible for verified users write the action address whether be the cipher key configuration address, if described cipher key content is write described cipher key storage block to be verified; Described cipher key storage block to be verified is used for storing described cipher key content; If not, cipher key content is not write described cipher key storage block to be verified, because cipher key storage block to be verified is still initial value, the inconsistent result of safety inspection checking circuit output verification is so the disabled user can't carry out debug; Described cipher key storage block to be verified is made of the register group, and it has a reset values when reset, and this reset values is set to described initial value, so the rear described cipher key storage block to be verified that powers on is all initial value at every turn.The cipher key content that writes cipher key storage block to be verified data after each power down can be lost, and re-power to become initial value after resetting, and therefore, the cipher key content that writes can not be repeated to utilize.
Described data comparison module reads cipher key content and key data and cipher key content and key data is compared from cipher key storage block to be verified and Efuse key storage module respectively, judge whether unanimously then check results to be delivered to described debug access switch circuit.When cipher key content is consistent with key data, the check results that output verification is consistent, otherwise the inconsistent check results of output verification;
Whether described debug access switch circuit is responsible for receiving the check results of described safety inspection checking circuit, and be connected with the chip internal circuit according to check results control debug interface.If debug access switch circuit is received the check results that verification is consistent, the debug interface is connected the normal operation of debug interface to the path of chip internal circuit; If receive the inconsistent check results of verification, the path of debug interface to the chip internal circuit disconnected, make the debug interface can't carry out the debug operation.
In the present embodiment, described debug access switch circuit can adopt MUX, take the comparative result of safety inspection checking circuit as selecting control line, when comparative result when being consistent, the MUX path is chosen external unit (as computing machine) line, if when result is inconsistent, the selector switch path is chosen fixed value 0.Described safety inspection checking circuit can adopt a plurality of comparers, the result of a plurality of comparers exports debug access switch circuit by one afterwards to door again, be specially: in cipher key content, the key value of each bit compares by the key data in a comparer and efuse, output 1 when numerical value is consistent, output 0 when inconsistent, and then the result of each comparer is inputted one and door, all results are carried out AND operation obtain final comparative result, output 1 when all numerical value are consistent, output 0 when inconsistent.
Only enumerate the structure of an example explanation debug access switch circuit and safety inspection checking circuit in the present embodiment, described debug access switch circuit is the circuit by a signal controlling disconnection or path, described safety inspection checking circuit is for realizing the relatively circuit of judgement, these two kinds of functional circuits are that those skilled in the art realize than being easier to, be not limited to the disclosed circuit structure of the present embodiment, just do not do having specifically described at this.
Need to prove, validated user is directly paid with cipher key configuration address and key data by chip production side, therefore, and when validated user carries out the debug connection, with cipher key configuration address and key data input, the check results that safety inspection checking circuit output verification is consistent; If not attempting carrying out debug, method user connects to steal chip internal information, but owing to there is no cipher key configuration address and key data, can't carry out illegal debug, also just can't visit the data in chip, thereby strengthen the confidentiality of data in the security of handheld device and handheld device.
The present invention its solved current anyone can carry out the problem of direct debug to the application chip of handheld device, strengthened the security of handheld device, and circuit structure is simple, consumes resources is few, increases chip cost little.
Technical scheme two:
See also Fig. 3, a kind of implementation method of the debug circuit structure with safety check comprises the steps:
Step 1, key data is write an Efuse key storage module; Be as this step 1 in the chip production process, Efuse key storage module is carried out write operation, key data is write.Because Efuse key storage module is resistance fuse programmed circuit, be different from that most of FPGA use
SRAM array, Efuse once only have a fuse to be programmed, in case programming, data can not change, after therefore key data being write, and not erasable or change;
Step 2, initial value is write a safety inspection checking circuit, described initial value is one and the different value of described key data, purpose is: in the chip operation process, use the debug interface that PC is connected with chip, initial value under original state in cipher key storage block to be verified be one with Efuse key storage module in different value, must make so the inconsistent result of safety inspection checking circuit output verification, and control debug access switch circuit and be in off-state, make the debug process to carry out;
In the present embodiment, described safety inspection checking circuit specifically comprises interconnective address check module, cipher key storage block to be verified and data comparison module, described address check module is connected with described debug interface, and described initial value writes the cipher key storage block to be verified of safety inspection checking circuit;
Step 3, described safety inspection checking circuit are write action address and cipher key content by what the debug interface received the user, and verification described write the action address whether be the cipher key configuration address, if, the safety inspection checking circuit reads key data from described Efuse key storage module, key data and cipher key content are compared, then check results is delivered to a debug access switch circuit;
Particularly, described address check module is write action address and cipher key content by what the debug interface received the user, at first verified users write the action address whether be the cipher key configuration address, if described cipher key content is write described cipher key storage block to be verified; If not, cipher key content is not write described cipher key storage block to be verified.Because cipher key storage block to be verified is still initial value, the inconsistent result of safety inspection checking circuit output verification is so the disabled user can't carry out debug; Described cipher key storage block to be verified is used for storing described cipher key content; Described cipher key storage block to be verified is made of the register group, and it has a reset values when reset, and this reset values is set to described initial value, so the rear described cipher key storage block to be verified that powers on is all initial value at every turn.The cipher key content that writes cipher key storage block to be verified data after each power down can be lost, and re-power to become initial value after resetting, and therefore, the cipher key content that writes can not be repeated to utilize.
Described data comparison module reads cipher key content and key data and cipher key content and key data is compared from cipher key storage block to be verified and Efuse key storage module respectively, judge whether unanimously then check results to be delivered to described debug access switch circuit.
Only have the user write the action address be that cipher key configuration address and cipher key content are consistent with key data, the safety inspection checking circuit is sent the consistent check results of verification, otherwise, send the inconsistent check results of verification;
Whether step 4, described debug access switch circuit are controlled the debug interface according to check results and are connected with the chip internal circuit, if receive the check results that verification is consistent, the debug interface are connected the normal operation of debug interface to the path of chip internal circuit; If receive the inconsistent check results of verification, the path of debug interface to the chip internal circuit disconnected, make the debug interface can't carry out the debug operation, unauthorized person can't know cipher key configuration address and key data also just can't with handheld device in the direct debug of application chip, can't visit the data in chip, thereby strengthen the confidentiality of data in the security of handheld device and handheld device.
In the present embodiment, described debug access switch circuit can adopt MUX, take the comparative result of safety inspection checking circuit as selecting control line, when comparative result when being consistent, the MUX path is chosen external unit (as computing machine) line, if when result is inconsistent, the selector switch path is chosen fixed value 0.Described safety inspection checking circuit can adopt a plurality of comparers, the result of a plurality of comparers exports debug access switch circuit by one afterwards to door again, be specially: in cipher key content, the key value of each bit compares by the key data in a comparer and efuse, output 1 when numerical value is consistent, output 0 when inconsistent, and then the result of each comparer is inputted one and door, all results are carried out AND operation obtain final comparative result, output 1 when all numerical value are consistent, output 0 when inconsistent.
Only enumerate the structure of an example explanation debug access switch circuit and safety inspection checking circuit in the present embodiment, described debug access switch circuit is the circuit by a signal controlling disconnection or path, described safety inspection checking circuit is for realizing the relatively circuit of judgement, these two kinds of functional circuits are that those skilled in the art realize than being easier to, be not limited to the disclosed circuit structure of the present embodiment, just do not do having specifically described at this.
Need to prove, validated user is directly paid with cipher key configuration address and key data by chip production side, therefore, and when validated user carries out the debug connection, with cipher key configuration address and key data input, the check results that safety inspection checking circuit output verification is consistent; If not attempting carrying out debug, method user connects to steal chip internal information, but owing to there is no cipher key configuration address and key data, can't carry out illegal debug, also just can't visit the data in chip, thereby strengthen the confidentiality of data in the security of handheld device and handheld device.
The present invention realizes double-security by cipher key configuration address and key data, has greatly strengthened the security of handheld device, and circuit structure is simple, and consumes resources is few, increases chip cost little.
Although more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present invention; those of ordinary skill in the art are in modification and the variation of the equivalence of doing according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (4)
1. debug circuit structure with safety check, it is characterized in that: described debug circuit structure comprises debug access switch circuit, safety inspection checking circuit and Efuse key storage module;
Described Efuse key storage module storage key data;
Described safety inspection checking circuit is write action address and cipher key content by what the debug interface received the user, and verification described write the action address whether be whether cipher key configuration address and described cipher key content consistent with key data, then check results is sent to described debug access switch circuit; Only have the user write the action address be that cipher key configuration address and cipher key content are consistent with key data, the safety inspection checking circuit is sent the consistent check results of verification, otherwise, send the inconsistent check results of verification; Described safety inspection checking circuit reads key data from Efuse key storage module, and key data and cipher key content are compared, and judges whether consistent;
Whether described debug access switch circuit is responsible for receiving the check results of described safety inspection checking circuit, and be connected with the chip internal circuit according to check results control debug interface.
2. a kind of debug circuit with safety check according to claim 1, it is characterized in that: described safety inspection checking circuit specifically comprises interconnective address check module, cipher key storage block to be verified and data comparison module, and described address check module is connected with described debug interface;
Described address check module be responsible for verified users write the action address whether be the cipher key configuration address, if described cipher key content is write described cipher key storage block to be verified;
Described cipher key storage block to be verified is used for storing described cipher key content;
Described data comparison module reads cipher key content and key data and cipher key content and key data is compared from cipher key storage block to be verified and Efuse key storage module respectively, judge whether unanimously then check results to be delivered to described debug access switch circuit.
3. the implementation method with the debug circuit structure of safety check, is characterized in that: comprise the steps:
Step 1, key data is write an Efuse key storage module;
Step 2, initial value is write a safety inspection checking circuit, described initial value be one with the different value of described key data;
Step 3, described safety inspection checking circuit are write action address and cipher key content by what the debug interface received the user, and verification described write the action address whether be the cipher key configuration address, if, the safety inspection checking circuit reads key data from described Efuse key storage module, key data and cipher key content are compared, then check results is delivered to a debug access switch circuit;
Whether step 4, described debug access switch circuit are controlled the debug interface according to check results and are connected with the chip internal circuit, if receive the check results that verification is consistent, the debug interface are connected the normal operation of debug interface to the path of chip internal circuit; If receive the inconsistent check results of verification, the path of debug interface to the chip internal circuit disconnected, make the debug interface can't carry out the debug operation, unauthorized person can't be known cipher key configuration address and key data, also just can't with handheld device in the direct debug of application chip, can't visit the data in chip, thereby strengthen the confidentiality of data in the security of handheld device and handheld device.
4. the implementation method of a kind of debug circuit structure with safety check according to claim 3, it is characterized in that: described safety inspection checking circuit specifically comprises interconnective address check module, cipher key storage block to be verified and data comparison module, and described address check module is connected with described debug interface;
Described step 2 is specially: initial value is write the cipher key storage block to be verified of safety inspection checking circuit, described initial value is one and the different value of described key data;
Described step 3 is specially: described address check module is write action address and cipher key content by what the debug interface received the user, at first verified users write the action address whether be the cipher key configuration address, if described cipher key content is write described cipher key storage block to be verified; If not? how to operate?
Described data comparison module reads cipher key content and key data and cipher key content and key data is compared from cipher key storage block to be verified and Efuse key storage module respectively, judge whether unanimously then check results to be delivered to described debug access switch circuit.
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| CN103279705A (en) * | 2013-05-14 | 2013-09-04 | 上海华为技术有限公司 | Validation method and validation device of chip with secure booting function |
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| CN106384066A (en) * | 2016-08-26 | 2017-02-08 | 易联(北京)物联网科技有限公司 | NFC tag locking method |
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| CN110096909A (en) * | 2019-04-19 | 2019-08-06 | 深圳忆联信息系统有限公司 | A kind of method and its system guaranteeing EFUSE code key stability |
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| US11942172B2 (en) | 2021-12-09 | 2024-03-26 | Realtek Semiconductor Corporation | Chip having debug function and chip debugging method |
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| CN113992324A (en) * | 2021-09-16 | 2022-01-28 | 深圳市有方科技股份有限公司 | Configuration method for hardware encryption module of IoT (Internet of things) equipment and related equipment |
| US11942172B2 (en) | 2021-12-09 | 2024-03-26 | Realtek Semiconductor Corporation | Chip having debug function and chip debugging method |
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Address after: 350000 Fuzhou Gulou District, Fujian, software Avenue, building 89, No. 18 Applicant after: FUZHOU ROCKCHIP ELECTRONICS CO., LTD. Address before: 350000 Fuzhou Gulou District, Fujian, software Avenue, building 89, No. 18 Applicant before: Fuzhou Rockchip Semiconductor Co., Ltd. |
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Application publication date: 20130619 |