issacweb/sample_issacweb_symmetric_encryption.c

#include <stdio.h>
 
#include "issacweb.h"
 
 
static int sample_setup() {
    EErrorCode result = wasdk_init();
    if (result != EEC_Success) {
        printf("[ERROR] %s\n", wasdk_error_message(result));
        return 1;
    }
    return 0;
}
 
static int sample_issacweb_symmetric_encryption() {
    const unsigned char plaintext[] = {
        0x80, 0x70, 0x60, 0x50, 0x40, 0x30, 0x20, 0x10,
        0x00, 0xF0, 0xE0, 0xD0, 0xC0, 0xB0, 0xA0, 0x90
    };
    unsigned char secretKey[] = {
        0x7B, 0xAA, 0x7D, 0x69, 0xAC, 0xE6, 0x52, 0xA0,
        0xD2, 0x1C, 0x16, 0x92, 0xAD, 0x91, 0x04, 0x1E
    };
    unsigned char encrypted[16 * ((sizeof(plaintext) / 16) + 1)] = { 0, };
    int encryptedLen = 0;
    unsigned char decrypted[sizeof(encrypted)] = { 0, }; // 버퍼의 크기는 암호문의 크기. 원문의 크기가 아닌 것에 유의할 것.
    int decryptedLen = 0;
 
    printf("sample_issacweb_symmetric_encryption() => ");
 
    encryptedLen = issacweb_encrypt_ex(encrypted, (unsigned char *) plaintext, sizeof(plaintext), secretKey, ISSACWEB_SEED);
    if (encryptedLen <= 0) {
        printf("[ERROR] %s\n", errorcode_to_string(encryptedLen));
        return 1;
    }
 
    decryptedLen = issacweb_decrypt_ex(decrypted, encrypted, encryptedLen, secretKey, ISSACWEB_SEED);
    if (decryptedLen <= 0) {
        printf("[ERROR] %s\n", errorcode_to_string(decryptedLen));
        return 1;
    }
 
    printf("[OK]\n");
 
    return 0;
}
 
int main() {
    int result;
 
    result = sample_setup();
    if (result != 0) {
        return result;
    }
 
    return sample_issacweb_symmetric_encryption();
}