Project implementation of C language XOR verification algorithm

1. XOR verification algorithm

XOR verification algorithm (XOR verification) is a simple verification algorithm used to detect whether data has errors during transmission or storage. By differentiating all bits in the data or, a check code is generated, and then comparing the check code to the received data to determine whether the data has been modified or corrupted.

The calculation process of the XOR verification algorithm is as follows:

(1) Exclusive OR operation of the data to be checked in bits.

(2) Use the obtained result as a verification code.

On the receiving end, by executing the same XOR verification algorithm, the received data is calculated again and compared with the verification code generated by the sending end. If the two check codes are consistent, it means that there is no error in the data transmission or storage; if the check codes are inconsistent, it means that the data may have been tampered with or an error occurred during the transmission process.

Exclusive Or verification algorithms are commonly used for simple data integrity verification, such as:

(1) Serial port communication: In serial port communication, XOR verification can be used to detect whether data is correctly transmitted from the sending end to the receiving end.

(2) Storage verification: In the storage medium, XOR verification can be used to verify the integrity of the data to ensure that the data is not damaged during reading and writing.

(3) Verification in network communication: In some communication protocols, XOR verification is also used to verify the correctness of the data.

The XOR verification algorithm can only detect odd-digit errors. If an even-digit error occurs during transmission or storage, the algorithm cannot detect and correct the error. Therefore, in more complex application scenarios, it may be necessary to use more powerful verification algorithms such as cyclic redundancy verification (CRC) to improve the reliability and error correction capabilities of error detection.

2. Code implementation

Scenario: In microcontroller communication, the microcontroller needs to send data to the upper computer. Encapsulate two functions, use the sender and receiver, and use the XOR verification algorithm to verify the data.

2.1 Sender function

#include <>
// Calculate the XOR verification code of the dataunsigned char calculate_xor_checksum(const unsigned char* data, size_t length) {
    unsigned char checksum = 0;
    for (size_t i = 0; i < length; i++) {
        checksum ^= data[i];
    }
    return checksum;
}
// Send data and attach XOR verification codevoid send_data_with_xor_checksum(const unsigned char* data, size_t length) {
    // Calculate XOR verification code    unsigned char checksum = calculate_xor_checksum(data, length);
    // Send data    printf("Send data:");
    for (size_t i = 0; i < length; i++) {
        printf("%02X ", data[i]);
    }
    printf("Exclusive Or verification code: %02X\n", checksum);
}
int main() {
    unsigned char data[] = { 0x12, 0x34, 0x56, 0x78 };
    send_data_with_xor_checksum(data, sizeof(data));
    return 0;
}

2.2 Receiver function

#include <>
// XOR verification code for verification dataint validate_xor_checksum(const unsigned char* data, size_t length, unsigned char checksum) {
    unsigned char calculated_checksum = calculate_xor_checksum(data, length);
    return (checksum == calculated_checksum);
}
// Receive data and verify XOR verification codevoid receive_data_with_xor_checksum(const unsigned char* data, size_t length, unsigned char checksum) {
    printf("Receive data:");
    for (size_t i = 0; i < length; i++) {
        printf("%02X ", data[i]);
    }
    // Verify XOR verification code    if (validate_xor_checksum(data, length, checksum)) {
        printf("Exorbit verification passed\n");
    } else {
        printf("Exorbit verification failed\n");
    }
}
int main() {
    unsigned char received_data[] = { 0x12, 0x34, 0x56, 0x78 };
    unsigned char received_checksum = 0xAB;
    receive_data_with_xor_checksum(received_data, sizeof(received_data), received_checksum);
    return 0;
}

In the sender function,calculate_xor_checksumThe function calculates the XOR check code of the data, and then sends the data and the check code together. In the receiver function,validate_xor_checksumThe function verifies whether the XOR check code of the received data is correct.

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