通过高级处理器硬件指令集AES-NI实现AES-256-CFB算法。

肝爆，以下为AES-256-CFB的基于硬件加速XMM指令集实现：
cpp 复制代码
#include <wmmintrin.h>
#include <emmintrin.h>
#include <string.h>
#include <iostream>
#include <iomanip>
#include <ctime>

// AES-256密钥扩展
void aes256_key_expansion(const uint8_t *key, __m128i *round_key) {
    // 加载初始密钥
    __m128i key1 = _mm_loadu_si128((const __m128i*)key);
    __m128i key2 = _mm_loadu_si128((const __m128i*)(key + 16));
    
    round_key[0] = key1;
    round_key[1] = key2;
    
    // 手动实现所有轮次
    __m128i temp = _mm_aeskeygenassist_si128(key2, 0x01);
    temp = _mm_shuffle_epi32(temp, 0xFF);
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 4));
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 8));
    key1 = _mm_xor_si128(key1, temp);
    round_key[2] = key1;
    
    temp = _mm_aeskeygenassist_si128(key1, 0x00);
    temp = _mm_shuffle_epi32(temp, 0xAA);
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 4));
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 8));
    key2 = _mm_xor_si128(key2, temp);
    round_key[3] = key2;
    
    temp = _mm_aeskeygenassist_si128(key2, 0x02);
    temp = _mm_shuffle_epi32(temp, 0xFF);
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 4));
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 8));
    key1 = _mm_xor_si128(key1, temp);
    round_key[4] = key1;
    
    temp = _mm_aeskeygenassist_si128(key1, 0x00);
    temp = _mm_shuffle_epi32(temp, 0xAA);
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 4));
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 8));
    key2 = _mm_xor_si128(key2, temp);
    round_key[5] = key2;
    
    temp = _mm_aeskeygenassist_si128(key2, 0x04);
    temp = _mm_shuffle_epi32(temp, 0xFF);
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 4));
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 8));
    key1 = _mm_xor_si128(key1, temp);
    round_key[6] = key1;
    
    temp = _mm_aeskeygenassist_si128(key1, 0x00);
    temp = _mm_shuffle_epi32(temp, 0xAA);
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 4));
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 8));
    key2 = _mm_xor_si128(key2, temp);
    round_key[7] = key2;
    
    temp = _mm_aeskeygenassist_si128(key2, 0x08);
    temp = _mm_shuffle_epi32(temp, 0xFF);
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 4));
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 8));
    key1 = _mm_xor_si128(key1, temp);
    round_key[8] = key1;
    
    temp = _mm_aeskeygenassist_si128(key1, 0x00);
    temp = _mm_shuffle_epi32(temp, 0xAA);
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 4));
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 8));
    key2 = _mm_xor_si128(key2, temp);
    round_key[9] = key2;
    
    temp = _mm_aeskeygenassist_si128(key2, 0x10);
    temp = _mm_shuffle_epi32(temp, 0xFF);
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 4));
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 8));
    key1 = _mm_xor_si128(key1, temp);
    round_key[10] = key1;
    
    temp = _mm_aeskeygenassist_si128(key1, 0x00);
    temp = _mm_shuffle_epi32(temp, 0xAA);
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 4));
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 8));
    key2 = _mm_xor_si128(key2, temp);
    round_key[11] = key2;
    
    temp = _mm_aeskeygenassist_si128(key2, 0x20);
    temp = _mm_shuffle_epi32(temp, 0xFF);
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 4));
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 8));
    key1 = _mm_xor_si128(key1, temp);
    round_key[12] = key1;
    
    temp = _mm_aeskeygenassist_si128(key1, 0x00);
    temp = _mm_shuffle_epi32(temp, 0xAA);
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 4));
    key2 = _mm_xor_si128(key2, _mm_slli_si128(key2, 8));
    key2 = _mm_xor_si128(key2, temp);
    round_key[13] = key2;
    
    temp = _mm_aeskeygenassist_si128(key2, 0x40);
    temp = _mm_shuffle_epi32(temp, 0xFF);
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 4));
    key1 = _mm_xor_si128(key1, _mm_slli_si128(key1, 8));
    key1 = _mm_xor_si128(key1, temp);
    round_key[14] = key1;
}

// AES-256加密单个块
__m128i aes256_encrypt_block(__m128i block, const __m128i *round_key) {
    block = _mm_xor_si128(block, round_key[0]);
    for (int i = 1; i < 14; i++) {
        block = _mm_aesenc_si128(block, round_key[i]);
    }

    block = _mm_aesenclast_si128(block, round_key[14]);
    return block;
}

// 明确区分加密和解密路径
void aes256_cfb_encrypt(uint8_t *ciphertext, const uint8_t *plaintext, size_t len,
                       const uint8_t *iv, const __m128i *round_key) {
    __m128i feedback = _mm_loadu_si128((const __m128i*)iv);
    size_t blocks = len / 16;
    size_t remaining = len % 16;
    
    // 处理完整块
    for (size_t i = 0; i < blocks; i++) {
        __m128i keystream = aes256_encrypt_block(feedback, round_key);
        __m128i plain_block = _mm_loadu_si128((const __m128i*)(plaintext + i * 16));
        __m128i cipher_block = _mm_xor_si128(plain_block, keystream);
        
        _mm_storeu_si128((__m128i*)(ciphertext + i * 16), cipher_block);
        
        // 加密时：使用生成的密文作为反馈
        feedback = cipher_block;
    }
    
    // 处理部分块
    if (remaining > 0) {
        __m128i keystream = aes256_encrypt_block(feedback, round_key);
        const uint8_t* src = plaintext + blocks * 16;
        uint8_t* dst = ciphertext + blocks * 16;
        
        for (size_t i = 0; i < remaining; i++) {
            dst[i] = src[i] ^ ((uint8_t*)&keystream)[i];
        }
    }
}

void aes256_cfb_decrypt(uint8_t *plaintext, const uint8_t *ciphertext, size_t len,
                       const uint8_t *iv, const __m128i *round_key) {
    __m128i feedback = _mm_loadu_si128((const __m128i*)iv);
    size_t blocks = len / 16;
    size_t remaining = len % 16;
    
    // 处理完整块
    for (size_t i = 0; i < blocks; i++) {
        __m128i keystream = aes256_encrypt_block(feedback, round_key);
        __m128i cipher_block = _mm_loadu_si128((const __m128i*)(ciphertext + i * 16));
        __m128i plain_block = _mm_xor_si128(cipher_block, keystream);
        
        _mm_storeu_si128((__m128i*)(plaintext + i * 16), plain_block);
        
        // 解密时：使用输入的密文作为反馈
        feedback = cipher_block;
    }
    
    // 处理部分块
    if (remaining > 0) {
        __m128i keystream = aes256_encrypt_block(feedback, round_key);
        const uint8_t* src = ciphertext + blocks * 16;
        uint8_t* dst = plaintext + blocks * 16;
        
        for (size_t i = 0; i < remaining; i++) {
            dst[i] = src[i] ^ ((uint8_t*)&keystream)[i];
        }
    }
}

// 打印十六进制数据
void print_hex(const char* label, const uint8_t* data, size_t len) {
    std::cout << label << ": ";
    for (size_t i = 0; i < len; i++) {
        std::cout << std::hex << std::setw(2) << std::setfill('0') 
                  << static_cast<int>(data[i]) << " ";
    }
    std::cout << std::dec << "\n";
}

// 验证实现正确性
bool test_aes256_cfb() {
    // 测试向量
    uint8_t key[32] = {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
    };
    
    uint8_t iv[16] = {
        0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
        0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff
    };
    
    const char* plaintext = "Hello, AES-256-CFB! This is a test.";
    size_t len = strlen(plaintext);
    
    // 扩展密钥存储
    __m128i round_key[15];
    aes256_key_expansion(key, round_key);
    
    uint8_t* ciphertext = new uint8_t[len];
    uint8_t* decrypted = new uint8_t[len + 1];
    
    // 加密（使用专用加密函数）
    aes256_cfb_encrypt(ciphertext, (const uint8_t*)plaintext, len, iv, round_key);
    
    // 解密（使用专用解密函数）
    aes256_cfb_decrypt(decrypted, ciphertext, len, iv, round_key);
    decrypted[len] = '\0';
    
    // 验证解密结果
    bool success = memcmp(plaintext, decrypted, len) == 0;
    
    if (!success) {
        std::cerr << "测试失败!\n";
        std::cerr << "原始文本: " << plaintext << "\n";
        std::cerr << "解密文本: " << decrypted << "\n";
        print_hex("原始数据", (const uint8_t*)plaintext, len);
        print_hex("解密数据", decrypted, len);
    }
    
    delete[] ciphertext;
    delete[] decrypted;
    
    return success;
}

int main() {
    // 首先运行自测试
    if (!test_aes256_cfb()) {
        std::cerr << "实现验证失败，请检查代码!\n";
        return 1;
    }
    
    // 示例密钥（256位 = 32字节）
    uint8_t key[32] = {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
    };
    
    // 示例IV（128位 = 16字节）
    uint8_t iv[16] = {
        0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
        0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff
    };
    
    // 测试数据
    const char* plaintext = "Hello, AES-256-CFB! This is a test message for encryption and decryption.";
    size_t len = strlen(plaintext);
    
    // 输出缓冲区
    uint8_t* ciphertext = new uint8_t[len];
    uint8_t* decrypted = new uint8_t[len + 1]; // +1 for null terminator
    
    // 扩展密钥存储
    __m128i round_key[15];
    aes256_key_expansion(key, round_key);
    
    std::cout << "\n=== AES-256-CFB 演示 ===\n";
    std::cout << "原始长度: " << len << " 字节\n";
    std::cout << "原始文本: " << plaintext << "\n\n";
    
    // 加密（使用专用加密函数）
    aes256_cfb_encrypt(ciphertext, (const uint8_t*)plaintext, len, iv, round_key);
    print_hex("加密结果", ciphertext, len); // 只显示前64字节
    
    // 解密（使用专用解密函数）
    aes256_cfb_decrypt(decrypted, ciphertext, len, iv, round_key);
    decrypted[len] = '\0'; // 添加字符串结束符
    std::cout << "解密文本: " << decrypted << "\n";
    
    // 验证结果
    if (memcmp(plaintext, decrypted, len) == 0) {
        std::cout << "\n验证成功: 解密文本与原始文本匹配!\n";
    } else {
        std::cout << "\n错误: 解密文本与原始文本不匹配!\n";
        std::cout << "原始长度: " << len << "\n";
        std::cout << "解密长度: " << strlen((const char*)decrypted) << "\n";
        print_hex("原始数据", (const uint8_t*)plaintext, len);
        print_hex("解密数据", decrypted, len);
    }
    
    // 清理
    delete[] ciphertext;
    delete[] decrypted;
    
    return 0;
}