请用C++语言写一个DES算法的字符串加密函数

可以使用以下C语言代码来实现DES算法的字符串加密函数： #include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<openssl/des.h>

static void des3_encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *key, unsigned char *iv, unsigned char *ciphertext)
{
DES_cblock * ks1, * ks2, * ks3;
DES_key_schedule ks1_sched, ks2_sched, ks3_sched;

// 初始化密钥
ks1 = (DES_cblock *)key;
ks2 = ks1 + 8;
ks3 = ks2 + 8;

// 生成密钥表
DES_set_key_unchecked(ks1, &ks1_sched);
DES_set_key_unchecked(ks2, &ks2_sched);
DES_set_key_unchecked(ks3, &ks3_sched);

// 加密
DES_ede3_cbc_encrypt((const unsigned char *)plaintext, ciphertext, plaintext_len, &ks1_sched, &ks2_sched, &ks3_sched, (DES_cblock *)iv, DES_ENCRYPT);
}

static void des3_decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *key, unsigned char *iv, unsigned char *plaintext)
{
DES_cblock * ks1, * ks2, * ks3;
DES_key_schedule ks1_sched, ks2_sched, ks3_sched;

// 初始化密钥
ks1 = (DES_cblock *)key;
ks2 = ks1 + 8;
ks3 = ks2 + 8;

// 生成密钥表
DES_set_key_unchecked(ks1, &ks1_sched);
DES_set_key_unchecked(ks2, &ks2_sched);
DES_set_key_unchecked(ks3, &ks3_sched);

// 解密
DES_ede3_cbc_encrypt(ciphertext, plaintext, ciphertext_len, &ks1_sched, &ks2_sched, &ks3_sched, (DES_cblock *)iv, DES_DECRYPT);
}

int main(int argc, char **argv)
{
// 获取明文
unsigned char *plaintext = (unsigned char *)argv[1];
int plaintext_len = strlen(argv[1]);

// 密钥
unsigned char *key = (unsigned char *)"12345678";

// 初始化向量
unsigned char iv[8] = { 0 };

// 加密后的密文
unsigned char ciphertext[1024] = { 0 };

// 加密
des3_encrypt(plaintext, plaintext_len, key, iv, ciphertext);

printf("DES3 Encrypted Text: %s\n", ciphertext);

// 解密
des3_decrypt(ciphertext, plaintext_len, key, iv, plaintext);

printf("DES3 Decrypted Text: %s\n", plaintext);

return 0;
}