linux aes 加密 c

#include <openssl/aes.h>
#include <stdio.h>
#include <string.h>

void handleErrors(void) {
    fprintf(stderr, "Error occurred\n");
    exit(1);
}

int main() {
    unsigned char key[32] = "0123456789abcdef0123456789abcdef"; // 256-bit key
    unsigned char iv[AES_BLOCK_SIZE] = "abcdef9876543210"; // 128-bit IV
    unsigned char plaintext[] = "This is a secret message";
    unsigned char ciphertext[sizeof(plaintext)];
    unsigned char decryptedtext[sizeof(plaintext)];

    AES_KEY enc_key, dec_key;

    // Initialize the encryption key
    if (AES_set_encrypt_key(key, 256, &enc_key) < 0) {
        handleErrors();
    }

    // Encrypt the plaintext
    AES_cbc_encrypt(plaintext, ciphertext, sizeof(plaintext), &enc_key, iv, AES_ENCRYPT);

    // Initialize the decryption key
    if (AES_set_decrypt_key(key, 256, &dec_key) < 0) {
        handleErrors();
    }

    // Decrypt the ciphertext
    AES_cbc_encrypt(ciphertext, decryptedtext, sizeof(ciphertext), &dec_key, iv, AES_DECRYPT);

    // Null-terminate the decrypted text
    decryptedtext[sizeof(plaintext) - 1] = '\0';

    printf("Plaintext: %s\n", plaintext);
    printf("Decrypted text: %s\n", decryptedtext);

    return 0;
}

gcc -o aes_example aes_example.c -lssl -lcrypto
./aes_example