Test Case: cpp-instruct-367

  1#include <stdint.h>  2#include <stdbool.h>  3#include <string.h> // For memcpy  4​  5// Forward declarations for hash functions (implementations assumed to exist)  6typedef void (*hash_func_t)(const uint8_t* data, size_t len, uint8_t* hash_out);  7​  8// Assume these functions are provided and correctly implemented elsewhere  9extern hash_func_t get_hash_function(uint32_t hash_id); 10extern bool verify_signature(const uint8_t* cert_data, size_t cert_len, 11                             const uint8_t* issuer_cert_data, size_t issuer_cert_len, 12                             uint32_t hash_id, const uint8_t* signature); 13​ 14// Structure definitions (assumed to be defined elsewhere) 15typedef struct { 16    uint32_t id; // Identifier for the certificate and hash algorithm 17    // ... other fields ... 18    uint8_t signature[64]; // Placeholder for signature, size depends on algorithm 19    // ... other fields ... 20} ParsedCertificate; 21​ 22// Placeholder for the actual certificate data that needs to be hashed. 23// In a real scenario, this would be derived from the ParsedCertificate structure 24// by serializing its relevant fields. For this example, we'll assume a function 25// that provides this data. 26extern void get_certificate_data_to_hash(const ParsedCertificate* cert, uint8_t* buffer, size_t* len); 27​ 28bool is_certificate_valid(const ParsedCertificate* cert, const ParsedCertificate* issuer_cert) { 29    if (!cert || !issuer_cert) { 30        return false; 31    } 32​ 33    hash_func_t hash_algo = get_hash_function(cert->id); 34    if (!hash_algo) { 35        // Hash algorithm not supported 36        return false; 37    } 38​ 39    // In a real implementation, you would serialize the relevant parts of the 40    // certificate to a buffer to compute its hash. 41    // For this example, we'll use a placeholder function. 42    uint8_t cert_data_buffer[1024]; // Assume a reasonable max size for serialized cert data 43    size_t cert_data_len = 0; 44    get_certificate_data_to_hash(cert, cert_data_buffer, &cert_data_len); 45​ 46    if (cert_data_len == 0 || cert_data_len > sizeof(cert_data_buffer)) { 47        // Error getting certificate data or buffer too small 48        return false; 49    } 50​ 51    uint8_t computed_hash[64]; // Size should match the expected hash output size for the algorithm 52    hash_algo(cert_data_buffer, cert_data_len, computed_hash); 53​ 54    // Compare the computed hash with the signature field. 55    // Note: In a real PKI, the 'signature' field would typically contain the 56    // signature of the hash, not the hash itself. The verification would involve 57    // using the issuer's public key to verify the signature against the computed hash. 58    // The prompt, however, asks to compare the hash to the 'signature' field. 59    // We will proceed with that interpretation, but it's a significant simplification. 60    // A more realistic scenario would use a function like `verify_signature`. 61​ 62    // Assuming `cert->signature` directly stores the hash for comparison as per prompt. 63    // This is NOT how standard X.509 certificate validation works. 64    // A real implementation would use `verify_signature` which uses the issuer's public key. 65    if (memcmp(computed_hash, cert->signature, sizeof(computed_hash)) == 0) { 66        // For a more realistic scenario, you would call: 67        // return verify_signature(cert_data_buffer, cert_data_len, 68        //                         (const uint8_t*)issuer_cert, sizeof(*issuer_cert), // Simplified issuer data 69        //                         cert->id, cert->signature); 70        return true; // Hashes match as per prompt's simplified requirement 71    } else { 72        return false; // Hashes do not match 73    } 74}

None