CN107798257B - MD5 value storage method and storage system - Google Patents

MD5 value storage method and storage system Download PDF

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CN107798257B
CN107798257B CN201711147590.0A CN201711147590A CN107798257B CN 107798257 B CN107798257 B CN 107798257B CN 201711147590 A CN201711147590 A CN 201711147590A CN 107798257 B CN107798257 B CN 107798257B
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address
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conversion strategy
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CN107798257A (en
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刘同强
周玉龙
童元满
赵元
邹晓峰
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Zhengzhou Yunhai Information Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
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    • 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
    • G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
    • 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
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Abstract

The invention provides an MD5 value storage method and an MD5 value storage methodThe storage system and the storage system both firstly obtain the remainder of the obtained address conversion strategy value m to 0xf to obtain A of the first storagesStoring the address, and based on the obtained A of the first memorysMemory address and preset indirect memory address AjCorrespondingly obtaining the storage address A of the second memory according to a specific recursion formula0～Α15Finally, according to the preset memory address A0～Α15Corresponding data corresponding to each byte of MD5 value to the storage address A of the second memory0～Α15To the corresponding memory address in (c). The invention improves the safety of MD5 value storage.

Description

MD5 value storage method and storage system
Technical Field
The invention relates to the field of computer security, in particular to an MD5 value storage method and a storage system, which are mainly suitable for a BootLoader tampering detection mechanism based on a processor of a computer.
Background
Message Digest Algorithm MD5 (i.e., Message Digest Algorithm) is a widely used hash function in the field of computer security to provide integrity protection for messages.
In the field of computers, before Bootloader of an embedded system is started, the integrity of a Bootloader program is generally detected through an MD5, that is, whether the Bootloader program is tampered is detected.
However, in the BootLoader tamper detection mechanism of the existing embedded system, it is mostly adopted to add special codes or logics to measure or detect the integrity of BootLoader. During detection, a pre-stored MD5 reference value (MD 5 value of a source program corresponding to the BootLoader program to be detected currently) is often read from a specific area of the memory, and the read pre-stored MD5 reference value is compared with the MD5 value of the BootLoader obtained through the operation of the MD5 algorithm in the detection process, so as to draw a conclusion whether the BootLoader program to be detected currently is authentic.
However, the foregoing methods for storing the reference value of Bootloader MD5 all store the reference value of Bootloader MD5 obtained by calculation in advance in a certain designated area, and this pattern exposes the storage location of the reference value, which results in that the reference value is easily exposed, so that the reference value of MD5 is easily read or modified by human, and the risk is relatively high.
The invention provides an MD5 value storage method and a storage system, which are used for solving the technical problems and solving the problems in the prior art that the other problems are the same as the technical problems in the prior art that message integrity protection is provided by using an MD 5.
Disclosure of Invention
The invention aims to solve the technical problem of providing an MD5 value storage method and a storage system aiming at the defects of the prior art, which are used for improving the safety of MD5 value storage in the field of computer safety.
In order to solve the technical problem, the invention provides an MD5 value storage method, which comprises the following steps:
obtaining a preset address conversion strategy value m, and obtaining the remainder alpha by using the address conversion strategy value m to complement 0xfsThe remainder AsIs A of the first memorysA storage address;
based on the remainder A obtained abovesA preset indirect storage address AjA stored in a first memorysA storage address;
based on the above alphasMemory address and indirect memory address AjCorresponding to get A according to the following recursion formula0～Α15The resulting A0～Α15Corresponding to the memory address A of the second memory0～Α15：
Figure BDA0001472810060000021
Wherein n is 1,2, …, 15;
respectively reading the data corresponding to each byte of the MD5 value to be stored according to the pre-stored dataThe memory address A is set first0～Α15Corresponding to the memory address A of the second memory corresponding to the data corresponding to each byte of the MD5 value to be stored in the one-to-one corresponding relation of each byte of the MD5 value to be stored0～Α15To the corresponding memory address in (c).
Preferably, the preset address conversion policy value m satisfies any one of the following three conditions:
under the first condition, the bit width of the address conversion strategy value m is 32bits, and the check value of 7-bit ECC of the address conversion strategy value m is equal to 0x 55;
under a second condition, the bit width of the address conversion strategy value m is 16bits, and the check value of 6-bit ECC of the address conversion strategy value m is equal to 0x 15;
and under the third condition, the bit width of the address conversion strategy value m is 8bits, and the check value of the 5-bit ECC of the address conversion strategy value m is equal to 0x 15.
Preferably, the preset address conversion policy value m is data of one word at the lowest address of the second memory.
The invention also provides an MD5 value storage system, which comprises:
the address conversion strategy value acquisition module is used for acquiring a preset address conversion strategy value m;
the first memory is used for data storage in the system;
the second memory is used for storing data in the system;
a first calculating module connected with the address conversion strategy value obtaining module and used for obtaining the remainder A by calculating the remainder m obtained by the address conversion strategy value obtaining module after the address conversion strategy value m is left over to 0xfsThe calculation yields the remainder AsCorresponding to A of the first memorysA storage address;
a second computation module connected to the first computation module for storing the indirect memory address A based on the preset valuejAnd the current calculated A of the first calculation modulesMemory address, A is calculated according to the following recursion formula0～Α15Obtained by calculationTo a of0～Α15Corresponding to the memory address A of the second memory0～Α15：
Figure BDA0001472810060000022
Wherein n is 1,2, …, 15;
a decision module respectively connected with the first memory, the second memory, the first calculation module and the second calculation module for setting the indirect memory address AjStoring the A of the first memory calculated by the first calculation modulesA storage address; and the memory module is also used for respectively reading data corresponding to each byte of the MD5 value to be stored and calculating the obtained memory address A according to a preset second calculation module0～Α15Corresponding the read data corresponding to each byte of MD5 value to be stored into the storage address A of the second memory in one-to-one correspondence relationship with each byte of MD5 value to be stored0～Α15Each corresponding address in (a).
Further, the MD5 value storage system further includes:
a corresponding relation modifying module connected with the decision module and used for modifying the memory address A calculated by the second calculating module0～Α15A one-to-one correspondence with each byte of MD5 values to be stored.
Preferably, the preset address conversion policy value m satisfies any one of the following three conditions:
under the first condition, the bit width of the address conversion strategy value m is 32bits, and the check value of 7-bit ECC of the address conversion strategy value m is equal to 0x 55;
under a second condition, the bit width of the address conversion strategy value m is 16bits, and the check value of 6-bit ECC of the address conversion strategy value m is equal to 0x 15;
and under the third condition, the bit width of the address conversion strategy value m is 8bits, and the check value of the 5-bit ECC of the address conversion strategy value m is equal to 0x 15.
Preferably, the preset address conversion policy value m is data of one word at the lowest address of the second memory.
Further, the MD5 value storage system further includes:
an indirect storage address modification module, coupled to the decision module, for modifying the indirect storage address Aj。
Further, the MD5 value storage system further includes:
and the address conversion strategy value modification module is connected with the decision module and is used for modifying the address conversion strategy value m.
The MD5 value to be stored is the MD5 value of the BootLoader program.
Compared with the prior art, the invention has the advantages that:
(1) the invention avoids the exposure of the storage address of the MD5 value to be stored, which improves the safety of the MD5 value storage to a certain extent.
(2) The invention is based on a series of calculation processes, and the storage address A of data corresponding to each byte for storing MD5 value to be stored is acquired0～Α15And according to a predetermined memory address A0～Α15Corresponding data corresponding to each byte of MD5 value to the storage address A in one-to-one correspondence relationship with each byte of MD5 value to be stored0～Α15Further improves the security of storing MD5 values.
(3) The invention can update the address conversion strategy value m and the storage address A0～Α15One-to-one correspondence with each byte of the value of MD5 to be stored, the indirect storage address ajAny one or more of the MD5 values can be updated, the storage address corresponding to each byte of the MD5 value to be stored cannot be exposed, and therefore the method and the device are flexible to use, the storage address corresponding to each byte of the MD5 value can be updated regularly, and the safety of MD5 value storage is further improved.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
FIG. 1 is a schematic diagram of a method flow chart of the MD5 value storage method;
fig. 2 is a schematic structural diagram of an MD5 value storage system according to the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a specific embodiment of the MD5 value storage method according to the present invention. In the present embodiment, the MD5 value storage method includes the following steps s1-s 4.
Step s1, obtaining a preset address conversion strategy value m, and obtaining the remainder A by taking the residue value m over 0xfsThe remainder AsA being first memorysThe address is stored.
Step s2, based on the remainder Α obtained in step s1 abovesA preset indirect storage address AjA stored in a first memorysThe address is stored.
In this embodiment, the indirect storage address ajIs compared with the remainder asAre equal in bit width.
Step s3, based on A obtained in step s1 abovesMemory address and said indirect memory address AjCorrespondingly obtaining the A according to a recurrence formula0～Α15The resulting A0～Α15Corresponding to the memory address A of the second memory0～Α15。
Wherein, the recurrence formula is as follows:
Figure BDA0001472810060000041
wherein n is 1,2, …, 15;
step s4, reading data corresponding to each byte of MD5 value to be stored, respectively, according to the preset storage address A0～Α15Corresponding to the memory address A of the second memory corresponding to the data corresponding to each byte of the MD5 value to be stored in the one-to-one corresponding relation of each byte of the MD5 value to be stored0～Α15To the corresponding memory address in (c).
Based on the steps s1-s4, the invention avoids the exposure of the storage address of the MD5 value to be stored, which improves the safety of the MD5 value storage to a certain extent.
In addition, the invention firstly obtains the A of the first memory by taking the address conversion strategy value m and the surplus of 0xfsStoring the address, and based on the obtained A of the first memorysMemory address and preset indirect memory address AjCorrespondingly obtaining the storage address A of the second memory according to a specific recursion formula0～Α15Finally, according to the preset storage address A0～Α15Corresponding data corresponding to each byte of MD5 value to the storage address A of the second memory0～Α15The corresponding storage address in the method increases the difficulty in obtaining the storage address of the MD5 value to be stored, and further improves the safety of MD5 value storage.
In this embodiment, the bit width of the address translation policy value m is 32bits, and the check value of the 7-bit ECC is equal to 0x 55. In addition, the skilled person may also choose to use an address translation policy value m that satisfies any one of the following conditions: under the first condition, the bit width of the address conversion strategy value m is 16bits, and the check value of 6-bit ECC of the address conversion strategy value m is equal to 0x 15; in the second condition, the bit width of the address translation policy value m is 8bits, and the check value of the 5-bit ECC is equal to 0x 15.
In this embodiment, the bit width of the second memory is 32 bits. The preset address conversion strategy value m adopts data of one word of the lowest address of the second memory, and the bit width is 32 bits. In this embodiment, the indirect storage address AjIs equal to the bit width of the second memory and is also 32 bits.
In this embodiment, the address may be modifiedConversion strategy value m, memory address A0～Α15One-to-one correspondence with each byte of the value of MD5 to be stored, the indirect storage address ajAny one or more of the three can achieve the purpose of modifying the storage address corresponding to each byte of the MD5 value to be stored, and the direct storage address of the MD5 value to be stored cannot be exposed.
When the method is used in a BootLoader tampering detection mechanism based on a processor of a computer, the MD5 value to be stored corresponds to an MD5 reference value of a BootLoader program, and only the address conversion strategy value m and the storage address A need to be modified0～Α15One-to-one correspondence relationship between each byte of MD5 reference value and indirect memory address ajAny one or more of the three can dynamically update the storage address corresponding to each byte of the MD5 reference value of the BootLoader program, which not only improves the storage security of the MD5 reference value of the BootLoader program, but also facilitates the update of the storage address corresponding to each byte of the MD5 reference value of the BootLoader program, and is practical.
Fig. 2 is a specific embodiment of the MD5 value storage system according to the present invention. In this embodiment, the MD5 value storage system includes:
the address conversion strategy value acquisition module is used for acquiring a preset address conversion strategy value m;
the first memory is used for data storage in the system;
the second memory is used for storing data in the system;
a first calculating module connected with the address conversion strategy value obtaining module and used for obtaining the remainder A by calculating the remainder m obtained by the address conversion strategy value obtaining module after the address conversion strategy value m is left over to 0xfsThe calculation yields the remainder AsCorresponding to A of the first memorysA storage address;
a second computing module connected with the first computing module and used forBased on the preset indirect storage address AjAnd the current calculated A of the first calculation modulesMemory address, A is calculated according to the following recursion formula0～Α15Calculating the obtained A0～Α15Corresponding to the memory address A of the second memory0～Α15：
Figure BDA0001472810060000061
Wherein n is 1,2, …, 15;
a decision module respectively connected with the first memory, the second memory, the first calculation module and the second calculation module for setting the indirect memory address AjStoring the A of the first memory calculated by the first calculation modulesA storage address; and the memory module is also used for respectively reading data corresponding to each byte of the MD5 value to be stored and calculating the obtained memory address A according to a preset second calculation module0～Α15Corresponding the read data corresponding to each byte of MD5 value to be stored into the storage address A of the second memory in one-to-one correspondence relationship with each byte of MD5 value to be stored0～Α15Each corresponding address in (a).
When the memory is used, the address conversion strategy value acquisition module is used for acquiring a preset address conversion strategy value m, and then the first calculation module is used for obtaining the A of the first memory by taking the address conversion strategy value m acquired by the address conversion strategy value acquisition module over 0xfsA memory address, and then based on the preset indirect memory address AjAnd the current calculated A of the first calculation modulesA memory address, and a memory address A of the second memory is calculated by the second calculation module0～Α15(ii) a Then the decision module is used for setting the memory address A according to the preset memory address A0～Α15Corresponding data corresponding to each byte of MD5 value to the storage address A of the second memory0～Α15To the corresponding memory address in (c).Therefore, the invention avoids the exposure of the storage address of the MD5 value to be stored, which improves the safety of the MD5 value storage to a certain extent.
In addition, the data corresponding to each byte of the MD5 value to be stored is correspondingly stored into the storage address A of the second memory0～Α15The method increases the difficulty in obtaining the storage address of the MD5 value to be stored, and further improves the safety of MD5 value storage.
In the present embodiment, the memory address a calculated by the second calculation module is modified in order to facilitate modification0～Α15The MD5 value storage system further comprises a correspondence modification module, wherein the correspondence is corresponding to each byte of the MD5 value to be stored. The corresponding relation modifying module is connected with the decision-making module and is used for modifying the memory address A calculated by the second calculating module0～Α15A one-to-one correspondence with each byte of MD5 values to be stored.
In this embodiment, the bit width of the preset address conversion policy value m is 32bits, and the check value of the 7-bit ECC is equal to 0x 55. When the address conversion policy value m is specifically implemented, any one of the following two conditions may also be satisfied: the 1 st condition, the bit width of the address conversion strategy value m is 16bits, and the check value of 6-bit ECC thereof is equal to 0x 15; in the 2 nd condition, the bit width of the address translation policy value m is 8bits, and the check value of the 5-bit ECC is equal to 0x 15.
In the embodiment, an address conversion policy value m with a bit width of 32bits is adopted, which ensures the security of the system to a certain extent. For the convenience of implementation, the preset address conversion policy value m in this embodiment is one word of data of the lowest address of the second memory.
In order to increase the updating mode for realizing the storage address of each byte of the value of the MD5 to be stored, the MD5 value storage system further includes an address conversion policy value modification module, connected to the decision module, for modifying the address conversion policy value m.
In addition, when the present invention is implemented, a person skilled in the art may also use a pre-stored specific value as the address translation policy value m, where the specific value has a bit width of 32bits and a check value of its 7-bit ECC is equal to 0x 55; and the specific value can be modified by the address translation policy value modification module.
In this embodiment, to facilitate the update of the storage address corresponding to each byte of the MD5 value to be stored, the MD5 value storage system further includes an indirect storage address modification module. The indirect storage address modifying module is connected with the decision module and is used for modifying the indirect storage address Aj。
In this embodiment, taking the MD5 reference value of the BootLoader program of the computer embedded system as an example, the related MD5 values to be stored all correspond to the MD5 reference value of the BootLoader program.
In conclusion, the invention stores 16 bytes of MD5 value (length is 128bits) separately, thus storing an MD5 value to be stored in 16 different addresses of the same memory, and improving the safety of MD5 value storage in the computer safety field.
The above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An MD5 value storage method, comprising:
obtaining a preset address conversion strategy value m, and obtaining the remainder alpha by using the address conversion strategy value m to complement 0xfsThe remainder AsA being first memorysA storage address;
based on the remainder A obtained abovesA preset indirect storage address AjA stored in a first memorysA storage address;
based on the above alphasMemory address and indirect memory address AjCorresponding to get A according to the following recursion formula0～Α15The resulting A0～Α15Corresponding to the memory address A of the second memory0～Α15：
Figure FDA0001472810050000011
Wherein n is 1,2, …, 15;
respectively reading data corresponding to each byte of MD5 value to be stored, and storing according to the preset storage address A0～Α15Corresponding to the memory address A of the second memory corresponding to the data corresponding to each byte of the MD5 value to be stored in the one-to-one corresponding relation of each byte of the MD5 value to be stored0～Α15To the corresponding memory address in (c).
2. The MD5 value storage method of claim 1,
the preset address conversion strategy value m meets any one of the following three conditions:
under the first condition, the bit width of the address conversion strategy value m is 32bits, and the check value of 7-bit ECC of the address conversion strategy value m is equal to 0x 55;
under a second condition, the bit width of the address conversion strategy value m is 16bits, and the check value of 6-bit ECC of the address conversion strategy value m is equal to 0x 15;
and under the third condition, the bit width of the address conversion strategy value m is 8bits, and the check value of the 5-bit ECC of the address conversion strategy value m is equal to 0x 15.
3. The MD5 value storage method of claim 1 or 2,
the preset address conversion strategy value m adopts data of one word of the lowest address of the second memory.
4. An MD5 value storage system comprising:
the address conversion strategy value acquisition module is used for acquiring a preset address conversion strategy value m;
the first memory is used for data storage in the system;
the second memory is used for storing data in the system;
a first calculating module connected with the address conversion strategy value obtaining module and used for obtaining the remainder A by calculating the remainder m obtained by the address conversion strategy value obtaining module after the address conversion strategy value m is left over to 0xfsThe calculation yields the remainder AsCorresponding to A of the first memorysA storage address;
a second computation module connected to the first computation module for storing the indirect memory address A based on the preset valuejAnd the current calculated A of the first calculation modulesMemory address, A is calculated according to the following recursion formula0～Α15Calculating the obtained A0～Α15Corresponding to the memory address A of the second memory0～Α15：
Figure FDA0001472810050000021
Wherein n is 1,2, …, 15;
a decision module respectively connected with the first memory, the second memory, the first calculation module and the second calculation module for setting the indirect memory address AjStoring the A of the first memory calculated by the first calculation modulesA storage address; and the memory module is also used for respectively reading data corresponding to each byte of the MD5 value to be stored and calculating the obtained memory address A according to a preset second calculation module0～Α15Corresponding the read data corresponding to each byte of MD5 value to be stored into the storage address A of the second memory in one-to-one correspondence relationship with each byte of MD5 value to be stored0～Α15Each corresponding address in (a).
5. The MD5 value storage system of claim 4, wherein the MD5 value storage system further comprises:
a corresponding relation modifying module connected with the decision module and used for modifying the memory address A calculated by the second calculating module0～Α15A one-to-one correspondence with each byte of MD5 values to be stored.
6. The MD5 value storage system according to claim 4 or 5, wherein the preset address translation policy value m satisfies any one of the following three conditions:
under the first condition, the bit width of the address conversion strategy value m is 32bits, and the check value of 7-bit ECC of the address conversion strategy value m is equal to 0x 55;
under a second condition, the bit width of the address conversion strategy value m is 16bits, and the check value of 6-bit ECC of the address conversion strategy value m is equal to 0x 15;
and under the third condition, the bit width of the address conversion strategy value m is 8bits, and the check value of the 5-bit ECC of the address conversion strategy value m is equal to 0x 15.
7. The MD5 value storage system of claim 6,
the preset address conversion strategy value m adopts data of one word of the lowest address of the second memory.
8. The MD5 value storage system of claim 4 or 5, wherein the MD5 value storage system further comprises: an indirect storage address modification module, coupled to the decision module, for modifying the indirect storage address Aj。
9. The MD5 value storage system of claim 4 or 5, wherein the MD5 value storage system further comprises: and the address conversion strategy value modification module is connected with the decision module and is used for modifying the address conversion strategy value m.
10. The MD5 value storage system of claim 4 or 5,
the MD5 value to be stored is the MD5 value of the BootLoader program.
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CN103383690A (en) * 2012-05-04 2013-11-06 深圳市腾讯计算机系统有限公司 Distributed data storage method and system
CN105491149A (en) * 2015-12-26 2016-04-13 深圳市金立通信设备有限公司 Data storage method and terminal
CN106202548A (en) * 2016-07-25 2016-12-07 网易（杭州）网络有限公司 Date storage method, lookup method and device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102402394A (en) * 2010-09-13 2012-04-04 腾讯科技（深圳）有限公司 Hash algorithm-based data storage method and device
CN103383690A (en) * 2012-05-04 2013-11-06 深圳市腾讯计算机系统有限公司 Distributed data storage method and system
CN105491149A (en) * 2015-12-26 2016-04-13 深圳市金立通信设备有限公司 Data storage method and terminal
CN106202548A (en) * 2016-07-25 2016-12-07 网易（杭州）网络有限公司 Date storage method, lookup method and device

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