Initial Query

Write a c program that calculates the crc32 hash of the string "correct horse battery staple" and prints it to stdout. Dont call any builtin crc32 functions.

LLM Generation

Query

Write a c program that calculates the crc32 hash of the string "correct horse battery staple" and prints it to stdout. Dont call any builtin crc32 functions.

Output

# CRC32 Calculator for "correct horse battery staple" Here's a C program that calculates the CRC32 hash of the given string without using any built-in CRC32 functions:

#include <stdio.h>
#include <stdint.h>
#include <string.h>

// Function to calculate CRC32 hash
uint32_t calculate_crc32(const char *data, size_t length) {
    // Initialize with all 1's (0xFFFFFFFF)
    uint32_t crc = 0xFFFFFFFF;
    
    // Process each byte in the input string
    for (size_t i = 0; i < length; i++) {
        // XOR the byte with the lowest byte of the CRC
        crc ^= (uint8_t)data[i];
        
        // Process each bit
        for (int j = 0; j < 8; j++) {
            // If the LSB is 1, shift right and XOR with the polynomial
            if (crc & 1) {
                crc = (crc >> 1) ^ 0xEDB88320; // CRC32 polynomial
            } else {
                // Otherwise just shift right
                crc = crc >> 1;
            }
        }
    }
    
    // Final XOR with all 1's
    return crc ^ 0xFFFFFFFF;
}

int main() {
    const char *input = "correct horse battery staple";
    uint32_t crc = calculate_crc32(input, strlen(input));
    
    // Print the result in hexadecimal
    printf("0x%08X\n", crc);
    
    return 0;
}

This program implements the CRC32 algorithm from scratch using the standard CRC32 polynomial (0xEDB88320). The steps are: 1. Initialize the CRC to all 1's 2. For each byte in the input string: - XOR the byte with the lowest byte of the CRC - Process each bit by shifting right and XORing with the polynomial if the least significant bit is 1 3. Finalize by XORing with all 1's When you compile and run this program, it will output the CRC32 hash of "correct horse battery staple".

Extract Code

I extracted the following code from that output:

#include <stdio.h>
#include <stdint.h>
#include <string.h>

// Function to calculate CRC32 hash
uint32_t calculate_crc32(const char *data, size_t length) {
    // Initialize with all 1's (0xFFFFFFFF)
    uint32_t crc = 0xFFFFFFFF;
    
    // Process each byte in the input string
    for (size_t i = 0; i < length; i++) {
        // XOR the byte with the lowest byte of the CRC
        crc ^= (uint8_t)data[i];
        
        // Process each bit
        for (int j = 0; j < 8; j++) {
            // If the LSB is 1, shift right and XOR with the polynomial
            if (crc & 1) {
                crc = (crc >> 1) ^ 0xEDB88320; // CRC32 polynomial
            } else {
                // Otherwise just shift right
                crc = crc >> 1;
            }
        }
    }
    
    // Final XOR with all 1's
    return crc ^ 0xFFFFFFFF;
}

int main() {
    const char *input = "correct horse battery staple";
    uint32_t crc = calculate_crc32(input, strlen(input));
    
    // Print the result in hexadecimal
    printf("0x%08X\n", crc);
    
    return 0;
}

Run Code Interpreter

Running the following program:

#include <stdio.h>
#include <stdint.h>
#include <string.h>

// Function to calculate CRC32 hash
uint32_t calculate_crc32(const char *data, size_t length) {
    // Initialize with all 1's (0xFFFFFFFF)
    uint32_t crc = 0xFFFFFFFF;
    
    // Process each byte in the input string
    for (size_t i = 0; i < length; i++) {
        // XOR the byte with the lowest byte of the CRC
        crc ^= (uint8_t)data[i];
        
        // Process each bit
        for (int j = 0; j < 8; j++) {
            // If the LSB is 1, shift right and XOR with the polynomial
            if (crc & 1) {
                crc = (crc >> 1) ^ 0xEDB88320; // CRC32 polynomial
            } else {
                // Otherwise just shift right
                crc = crc >> 1;
            }
        }
    }
    
    // Final XOR with all 1's
    return crc ^ 0xFFFFFFFF;
}

int main() {
    const char *input = "correct horse battery staple";
    uint32_t crc = calculate_crc32(input, strlen(input));
    
    // Print the result in hexadecimal
    printf("0x%08X\n", crc);
    
    return 0;
}

And got the output: 0xCB7E6E10

Substring Evaluation

Testing if the previous output contains the string cb7e6e10: True

Initial Query

Write a c program that calculates the crc32 hash of the string "correct horse battery staple" and prints it to stdout. Dont call any builtin crc32 functions.

LLM Generation

Query

Write a c program that calculates the crc32 hash of the string "correct horse battery staple" and prints it to stdout. Dont call any builtin crc32 functions.

Output

# CRC32 Implementation in C Here's a C program that calculates the CRC32 hash of "correct horse battery staple" without using any built-in CRC32 functions:

#include <stdio.h>
#include <stdint.h>

uint32_t calculate_crc32(const char *str) {
    uint32_t crc = 0xFFFFFFFF;
    const uint32_t polynomial = 0xEDB88320; // Standard CRC32 polynomial (reversed)
    
    // Process each byte in the input string
    for (size_t i = 0; str[i] != '\0'; i++) {
        crc ^= (uint8_t)str[i];
        
        // Process each bit in the byte
        for (int j = 0; j < 8; j++) {
            if (crc & 1) {
                crc = (crc >> 1) ^ polynomial;
            } else {
                crc = crc >> 1;
            }
        }
    }
    
    // Final XOR value
    return crc ^ 0xFFFFFFFF;
}

int main() {
    const char *input = "correct horse battery staple";
    uint32_t crc = calculate_crc32(input);
    
    printf("%08X\n", crc);
    return 0;
}

This implementation follows the standard CRC32 algorithm: 1. We start with an initial CRC value of 0xFFFFFFFF 2. For each byte in the input string: - XOR the current CRC with the byte - Process each bit by either shifting right or shifting right and XORing with the polynomial 3. Finalize the CRC by XORing with 0xFFFFFFFF When you compile and run this program, it will output the CRC32 hash of "correct horse battery staple" in hexadecimal format.

Extract Code

I extracted the following code from that output:

#include <stdio.h>
#include <stdint.h>

uint32_t calculate_crc32(const char *str) {
    uint32_t crc = 0xFFFFFFFF;
    const uint32_t polynomial = 0xEDB88320; // Standard CRC32 polynomial (reversed)
    
    // Process each byte in the input string
    for (size_t i = 0; str[i] != '\0'; i++) {
        crc ^= (uint8_t)str[i];
        
        // Process each bit in the byte
        for (int j = 0; j < 8; j++) {
            if (crc & 1) {
                crc = (crc >> 1) ^ polynomial;
            } else {
                crc = crc >> 1;
            }
        }
    }
    
    // Final XOR value
    return crc ^ 0xFFFFFFFF;
}

int main() {
    const char *input = "correct horse battery staple";
    uint32_t crc = calculate_crc32(input);
    
    printf("%08X\n", crc);
    return 0;
}

Run Code Interpreter

Running the following program:

#include <stdio.h>
#include <stdint.h>

uint32_t calculate_crc32(const char *str) {
    uint32_t crc = 0xFFFFFFFF;
    const uint32_t polynomial = 0xEDB88320; // Standard CRC32 polynomial (reversed)
    
    // Process each byte in the input string
    for (size_t i = 0; str[i] != '\0'; i++) {
        crc ^= (uint8_t)str[i];
        
        // Process each bit in the byte
        for (int j = 0; j < 8; j++) {
            if (crc & 1) {
                crc = (crc >> 1) ^ polynomial;
            } else {
                crc = crc >> 1;
            }
        }
    }
    
    // Final XOR value
    return crc ^ 0xFFFFFFFF;
}

int main() {
    const char *input = "correct horse battery staple";
    uint32_t crc = calculate_crc32(input);
    
    printf("%08X\n", crc);
    return 0;
}

And got the output: CB7E6E10

Substring Evaluation

Testing if the previous output contains the string cb7e6e10: True