c语言实现AES加密算法的源码解析

AES（Advanced Encryption Standard）是一种对称加密算法，广泛应用于数据加密和解密，以下是一个使用C语言实现的AES128位加密和解密的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// AES128 key size in bytes
#define AES_KEY_SIZE 16
typedef struct {
    unsigned char data[16];
} AES_KEY;
typedef struct {
    unsigned char data[16];
} AES_BLOCK;
void aes_expand_key(const unsigned char *key, AES_KEY *expanded_key) {
    // This function expands the AES key to be used in the encryption and decryption processes.
    // The implementation of this function is quite complex and lengthy, so it is not included here.
}
void aes_encrypt(const AES_KEY *key, const AES_BLOCK *plaintext, AES_BLOCK *ciphertext) {
    // This function performs AES encryption on the given plaintext block using the provided key.
    // The implementation of this function is quite complex and lengthy, so it is not included here.
}
void aes_decrypt(const AES_KEY *key, const AES_BLOCK *ciphertext, AES_BLOCK *plaintext) {
    // This function performs AES decryption on the given ciphertext block using the provided key.
    // The implementation of this function is quite complex and lengthy, so it is not included here.
}
int main() {
    unsigned char key[AES_KEY_SIZE] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
    unsigned char plaintext[AES_BLOCK_SIZE] = {0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0xa7, 0x0c, 0xe1, 0x3b, 0x1c, 0xd4, 0x6a, 0x42};
    unsigned char ciphertext[AES_BLOCK_SIZE];
    unsigned char decrypted_text[AES_BLOCK_SIZE];
    AES_KEY expanded_key;
    aes_expand_key(key, &expanded_key);
    aes_encrypt(&expanded_key, (AES_BLOCK *)plaintext, (AES_BLOCK *)ciphertext);
    aes_decrypt(&expanded_key, (AES_BLOCK *)ciphertext, (AES_BLOCK *)decrypted_text);
    printf("Ciphertext: ");
    for (int i = 0; i < AES_BLOCK_SIZE; i++) {
        printf("%02x", ciphertext[i]);
    }
    printf("
");
    printf("Decrypted text: ");
    for (int i = 0; i < AES_BLOCK_SIZE; i++) {
        printf("%02x", decrypted_text[i]);
    }
    printf("
");
    return 0;
}

这个示例代码包含了AES128位加密和解密的基本框架，但并未包含具体的加密和解密实现，要实现完整的AES加密和解密功能，需要补充aes_expand_key、aes_encrypt和aes_decrypt函数的具体实现，这些函数的实现涉及到多个步骤和子操作，如SubBytes、ShiftRows、MixColumns、AddRoundKey等，具体实现较为复杂。

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