AES rijndael在c和java之间加密

的代码示例。在下面的代码示例中，我们将演示如何使用 AES-256 加密算法在 C 和 Java 之间进行加密。

C 代码示例：

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

#define AES_BLOCK_SIZE 16

int main(int argc, char *argv[]) {
    unsigned char key[AES_BLOCK_SIZE] = "0123456789abcdef";
    unsigned char iv[AES_BLOCK_SIZE] = "fedcba9876543210";

    AES_KEY aesKey;
    AES_set_encrypt_key(key, AES_BLOCK_SIZE * 8, &aesKey);

    char plaintext[] = "This is a secret message";
    int plaintext_len = strlen(plaintext);

    int ciphertext_len = ((plaintext_len + AES_BLOCK_SIZE - 1) / AES_BLOCK_SIZE) * AES_BLOCK_SIZE;
    unsigned char ciphertext[ciphertext_len];

    AES_cbc_encrypt((unsigned char*)plaintext, ciphertext, plaintext_len, &aesKey, iv, AES_ENCRYPT);

    printf("Ciphertext: ");
    for(int i = 0; i < ciphertext_len; i++) {
        printf("%02x", ciphertext[i]);
    }
    printf("
");

    return 0;
}

Java 代码示例：

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class AesCbcExample {

    private static final String ALGO_NAME = "AES";
    private static final int KEY_SIZE = 256;
    private static final int BLOCK_SIZE = 16;

    public static void main(String[] args) throws Exception {
        byte[] key = "0123456789abcdef".getBytes();
        byte[] iv = "fedcba9876543210".getBytes();

        SecretKeySpec keySpec = new SecretKeySpec(key, ALGO_NAME);
        Cipher cipher = Cipher.getInstance(ALGO_NAME);
        SecureRandom secureRandom = new SecureRandom();
        secureRandom.nextBytes(iv);
        cipher.init(Cipher.ENCRYPT_MODE, keySpec, secureRandom);

        String plainText = "This is a secret message";
        byte[] plainTextBytes = plainText.getBytes();
        int plainTextLen = plainTextBytes.length;

        int cipherTextLen = ((plainTextLen + BLOCK_SIZE) / BLOCK_SIZE) * BLOCK_SIZE;
        byte[] cipherText = new byte[cipherTextLen];

        cipher.doFinal(plainTextBytes, 0, plainTextLen, cipherText, 0);

        System.out.println("Ciphertext: ");
        for (int i = 0; i < cipherText.length; i++) {
            System.out.print(Integer.toHexString(cipherText[i] & 0xFF) + " ");
        }
        System.out.println();
    }
}

这两个示例都使用了 AES-256 算法，并提供了密钥和初始化向量 (IV) 的不同实现。在 C 示例中，我们使用了 OpenSSL 的 AES 函数库，而在 Java 示例中，我们使用了 Java 提供的 javax.crypto.Cipher 类。两者都可以通过设置相应的参数来进行加密和解密操作。