Data integrity checking between circuits

An apparatus comprising:

• a communication bus;
• a first circuit coupled to the communication bus, and operational to:
• generate a package that includes a header, payload data, and a footer;
• logically partition the payload data into protected data and unprotected data;
• generate a message authentication code based on the header, the protected data, and an encrypted check value in the footer, wherein the message authentication code is generated independent of the unprotected data;
• store the message authentication code in the footer;
• transmit the package on the communication bus;
• and
• a second circuit coupled to the communication bus, and operational to:
• receive the package from the communication bus;
• extract the message authentication code from the package;
• perform a package verification of the header, the protected data, and an encrypted check value with the message authentication code;
• and
• signal that the package is valid in response to passage of the package verification.

A method for data integrity checking between circuits comprising:

• generating a package with a first circuit, wherein the package includes a header, payload data, and a footer;
• selecting a particular cyclic redundancy check variant at random from a plurality of cyclic redundancy check variants;
• storing a check identifier of the particular cyclic redundancy check variant in the header of the package;
• calculating a check value of the payload data with the particular cyclic redundancy check variant;
• encrypting the check value to generate an encrypted check value;
• storing the encrypted check value in the footer of the package;
• partitioning logically the payload data into protected data and unprotected data;
• generating a message authentication code based on the header, the protected data, and the encrypted check value in the footer, wherein the message authentication code is generated independent of the unprotected data;
• storing the message authentication code in the footer;
• transmitting the package on a communication bus from the first circuit;
• receiving the package at a second circuit from the communication bus;
• extracting the payload data, the encrypted check value, the check identifier, and the message authentication code from the package;
• determining the particular cyclic redundant check variant used in the first circuit with the check identifier;
• decrypting the encrypted check value to determine the check value calculated by the first circuit;
• performing a payload verification of the payload data in the second circuit with the particular cyclic redundancy check variant and the check value;
• signaling that the payload data is valid in response to passage of the payload verification;
• performing a package verification of the header, the protected data, and an encrypted check value in the second circuit with the message authentication code;
• and
• signaling that the package is valid in response to passage of the package verification.