aes五种加密模式c语言代码

AES（Advanced Encryption Standard）是一种对称加密算法，它有五种加密模式：电子密码本模式（Electronic Codebook Mode，ECB）、加密块链接模式（Cipher Block Chaining Mode，CBC）、加密反馈模式（Cipher Feedback Mode，CFB）、输出反馈模式（Output Feedback Mode，OFB）和计数器模式（Counter Mode，CTR）。下面是用C语言实现这五种加密模式的代码：

1. 电子密码本模式（ECB）：

#include <openssl/aes.h>

int main()
{
    AES_KEY key;
    unsigned char plaintext[16] = "This is a test";
    unsigned char ciphertext[16];
    unsigned char keystr[16] = "0123456789abcdef";

    AES_set_encrypt_key(keystr, 128, &key);
    AES_encrypt(plaintext, ciphertext, &key);
    
    return 0;
}

2. 加密块链接模式（CBC）：

#include <openssl/aes.h>

int main()
{
    AES_KEY key;
    unsigned char plaintext[16] = "This is a test";
    unsigned char ciphertext[16];
    unsigned char iv[16] = "0123456789abcdef";
    unsigned char keystr[16] = "0123456789abcdef";

    AES_set_encrypt_key(keystr, 128, &key);
    AES_cbc_encrypt(plaintext, ciphertext, 16, &key, iv, AES_ENCRYPT);
    
    return 0;
}

3. 加密反馈模式（CFB）：

#include <openssl/aes.h>

int main()
{
    AES_KEY key;
    unsigned char plaintext[16] = "This is a test";
    unsigned char ciphertext[16];
    unsigned char iv[16] = "0123456789abcdef";
    unsigned char keystr[16] = "0123456789abcdef";

    AES_set_encrypt_key(keystr, 128, &key);
    AES_cfb_encrypt(plaintext, ciphertext, 16, &key, iv, NULL, AES_ENCRYPT);
    
    return 0;
}

4. 输出反馈模式（OFB）：

#include <openssl/aes.h>

int main()
{
    AES_KEY key;
    unsigned char plaintext[16] = "This is a test";
    unsigned char ciphertext[16];
    unsigned char iv[16] = "0123456789abcdef";
    unsigned char keystr[16] = "0123456789abcdef";

    AES_set_encrypt_key(keystr, 128, &key);
    AES_ofb128_encrypt(plaintext, ciphertext, 16, &key, iv, NULL);
    
    return 0;
}

5. 计数器模式（CTR）：

#include <openssl/aes.h>

int main()
{
    AES_KEY key;
    unsigned char plaintext[16] = "This is a test";
    unsigned char ciphertext[16];
    unsigned char iv[16] = "0123456789abcdef";
    unsigned char ecount_buf[16];
    unsigned int num = 0;
    unsigned char keystr[16] = "0123456789abcdef";

    AES_set_encrypt_key(keystr, 128, &key);
    AES_ctr128_encrypt(plaintext, ciphertext, 16, &key, iv, ecount_buf, &num);
    
    return 0;
}

以上就是用C语言实现AES五种加密模式的代码。请注意，这里使用了OpenSSL库进行AES加密操作，你需要提前安装好OpenSSL库并链接到你的项目中。