A chip storage body and code protection method based on static encrypted storage and dynamic decryption operation

Abstract

The invention relates to a code protection method based on static encrypted storage and dynamic decrypted operation. The code protection method comprises the following steps: step 1, after a chip is reset and restarted, a program pointer skips into a static memory bank to directly run a plain text code and executes an application operation with a low secrecy requirement of the code; step 2, when a function library relevant with a cipher text code is required to be invoked, the cipher text code can be read and encrypted in a code operation region of a dynamic memory bank by the currently-run code; step 3, the program pointer skips into the code operation region of the dynamic memory bank to run a code function obtained by encryption; step 4, after the running of the code function obtained by the encryption is finished, the program pointer skips back to the static memory bank to remove data in the code operation region in the dynamic memory bank and continuously run the code; and step 5, when the function library relevant with the cipher text code is required to be invoked again, the step 2, the step 3 and the step 4 are repeated. The code protection method based on the static encrypted storage and the dynamic decrypted operation has the beneficial effects that a key code is statically stored in a cipher text manner, real-time dynamic decrypted operation of the code is realized, and the problem that the code of an embedded chip is easily split, read and encrypted is solved.

Description

technical field [0001] The invention relates to the field of embedded programming chips such as MCU, MPU, DSP, ARM, etc., in particular to a code protection method based on static encryption storage and dynamic decryption operation. Background technique [0002] In today's increasingly information-based society, computers and networks have fully penetrated into every corner of daily life. For each of us, what we need is no longer just the kind of computer "machine" that is placed on the table to process documents, work management and production control; various new embedded system devices have far exceeded the number of applications More than a general-purpose computer, any ordinary person may have a variety of electronic products using embedded technology, ranging from small digital products such as mp3 and PDA, to large network appliances, smart home appliances, and vehicle-mounted electronic equipment. In the field of industry and service, digital machine tools, intellig...

AI Technical Summary

Problems solved by technology

The key code is statically stored in ciphertext, realizing the real-time dynamic decryption and operation of the code, and solving the problem that the code of the embedded chip is easy to be read and deciphered

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