C++builder XE6如何进行AES加密并支持偏移量(IV)
时间: 2024-01-21 10:04:41 浏览: 56
C++Builder XE6可以使用OpenSSL库进行AES加密,并且支持设置偏移量(IV)。以下是一个示例代码:
```c++
#include <openssl/aes.h>
#include <cstring>
// 加密函数
void aes_encrypt(const unsigned char *plaintext, int plaintext_len,
const unsigned char *key, const unsigned char *iv,
unsigned char *ciphertext) {
AES_KEY aes_key;
AES_set_encrypt_key(key, 128, &aes_key);
AES_cbc_encrypt(plaintext, ciphertext, plaintext_len, &aes_key, iv, AES_ENCRYPT);
}
// 解密函数
void aes_decrypt(const unsigned char *ciphertext, int ciphertext_len,
const unsigned char *key, const unsigned char *iv,
unsigned char *plaintext) {
AES_KEY aes_key;
AES_set_decrypt_key(key, 128, &aes_key);
AES_cbc_encrypt(ciphertext, plaintext, ciphertext_len, &aes_key, iv, AES_DECRYPT);
}
int main() {
const unsigned char *plaintext = (unsigned char *)"Hello World!";
const unsigned char *key = (unsigned char *)"0123456789abcdef";
const unsigned char *iv = (unsigned char *)"1234567890abcdef";
unsigned char ciphertext[16];
unsigned char decryptedtext[16];
// 加密
aes_encrypt(plaintext, strlen((char *)plaintext), key, iv, ciphertext);
// 解密
aes_decrypt(ciphertext, 16, key, iv, decryptedtext);
// 输出结果
printf("Plaintext: %s\n", plaintext);
printf("Ciphertext: ");
for (int i = 0; i < 16; i++) printf("%02x", ciphertext[i]);
printf("\nDecryptedtext: %s\n", decryptedtext);
return 0;
}
```
在这个示例中,我们使用了`AES_set_encrypt_key`和`AES_set_decrypt_key`函数设置加密和解密所需的密钥,使用`AES_cbc_encrypt`函数进行加密和解密,并且传入了偏移量(IV)。注意,偏移量的长度必须与块长度相同,对于AES-128算法,块长度为128位,偏移量长度也为128位。
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