這段JAVA代碼轉成C# 怎麽寫？

這段代碼涉及到密鑰生成和加密操作，需要引入相關的加密庫來實現。在C語言中，可以使用 OpenSSL 庫來實現AES加密和解密操作。下面是大致的實現思路：

#include <openssl/evp.h>

#include <openssl/rand.h>

#include <openssl/aes.h>

unsigned char* aes_encrypt(unsigned char* key, unsigned char* iv, unsigned char* plaintext, int plaintext_len, int* ciphertext_len) {

EVP_CIPHER_CTX* ctx;

unsigned char* ciphertext;

int len;

int ciphertext_len_local;

// 創建並初始化加密上下文

ctx = EVP_CIPHER_CTX_new();

EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);

// 分配輸出緩沖區

ciphertext = (unsigned char*)malloc(plaintext_len + AES_BLOCK_SIZE);

// 加密數據

EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len);

ciphertext_len_local = len;

// 結束加密操作

EVP_EncryptFinal_ex(ctx, ciphertext + len, &len);

ciphertext_len_local += len;

// 釋放加密上下文

EVP_CIPHER_CTX_free(ctx);

// 返回密文和密文長度

*ciphertext_len = ciphertext_len_local;

return ciphertext;

}

unsigned char* aes_decrypt(unsigned char* key, unsigned char* iv, unsigned char* ciphertext, int ciphertext_len, int* plaintext_len) {

EVP_CIPHER_CTX* ctx;

unsigned char* plaintext;

int len;

int plaintext_len_local;

// 創建並初始化解密上下文

ctx = EVP_CIPHER_CTX_new();

EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);

// 分配輸出緩沖區

plaintext = (unsigned char*)malloc(ciphertext_len);

// 解密數據

EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len);

plaintext_len_local = len;

// 結束解密操作

EVP_DecryptFinal_ex(ctx, plaintext + len, &len);

plaintext_len_local += len;

// 釋放解密上下文

EVP_CIPHER_CTX_free(ctx);

// 返回明文和明文長度

*plaintext_len = plaintext_len_local;

return plaintext;

}

int main() {

// 密鑰和IV

unsigned char* key = (unsigned char*)"0123456789012345";

unsigned char* iv = (unsigned char*)"0123456789012345";

// 明文

unsigned char* plaintext = (unsigned char*)"hello, world";

int plaintext_len = strlen((char*)plaintext);

// 加密操作

int ciphertext_len;

unsigned char* ciphertext = aes_encrypt(key, iv, plaintext, plaintext_len, &ciphertext_len);

// 輸出密文

printf("ciphertext: ");

for (int i = 0; i < ciphertext_len; i++) {

printf("%02x", ciphertext[i]);

}

printf("\n");

// 解密操作

int plaintext_len2;

unsigned char* plaintext2 = aes_decrypt(key, iv, ciphertext, ciphertext_len, &plaintext_len2);

// 輸出明文

printf("plaintext: %s\n", plaintext2);

// 釋放內存

free(ciphertext);

free(plaintext2);

return 0;

}

需要註意的是，上述代碼只是壹個大致的實現思路，實際應用時還需要根據具體情況進行修改和優化。

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