aes.c

void aes_ecb_encrypt(unsigned char * plain_text, unsigned char* key, int text_length) {

    for (int i = 0; i < text_length; i += 16) {
        AES_encrypt(plain_text + i, key);
    }
}


void aes_ecb_decrypt(unsigned char * plain_text, unsigned char* key, int text_length) {

    for (int i = 0; i < text_length; i += 16) {
        AES_decrypt(plain_text + i, key);
    }
}

void aes_cbc_encrypt(unsigned char * plain_text, unsigned char* key, int text_length, unsigned char * iv) {
    
    unsigned char * xor_vector = iv;

    for (int i = 0; i < text_length; i += 16) {
        AddRoundKey(plain_text+i, xor_vector);
        AES_encrypt(plain_text+i, key);
        xor_vector = plain_text + i;
    }

}

void aes_cbc_decrypt(unsigned char * plain_text, unsigned char* key, int text_length, unsigned char * iv) {

    unsigned char * xor_vector = iv;
    unsigned char place_holder[AES_SIZE];

    for (int i = 0; i < text_length; i += 16) {
        memcpy(place_holder, plain_text+i, AES_SIZE);
        AES_decrypt(plain_text + i, key);
        AddRoundKey(plain_text + i, xor_vector);
        memcpy(xor_vector, place_holder, AES_SIZE);
    }

}