crypto 编译linux

sudo apt-get update
sudo apt-get install build-essential checkinstall zlib1g-dev -y

wget https://www.openssl.org/source/openssl-3.0.0.tar.gz
tar -xvzf openssl-3.0.0.tar.gz
cd openssl-3.0.0

./config --prefix=/usr/local/ssl --openssldir=/usr/local/ssl shared zlib
make
sudo make install

echo "/usr/local/ssl/lib" | sudo tee /etc/ld.so.conf.d/openssl.conf
sudo ldconfig

#include <openssl/evp.h>
#include <string.h>

void handleErrors() {
    // 错误处理函数
}

int encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *key,
            unsigned char *iv, unsigned char *ciphertext) {
    EVP_CIPHER_CTX *ctx;
    int len;
    int ciphertext_len;

    if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();
    if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv)) handleErrors();
    if(1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len)) handleErrors();
    ciphertext_len = len;
    if(1 != EVP_EncryptFinal_ex(ctx, ciphertext + len, &len)) handleErrors();
    ciphertext_len += len;
    EVP_CIPHER_CTX_free(ctx);
    return ciphertext_len;
}

int decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *key,
            unsigned char *iv, unsigned char *plaintext) {
    EVP_CIPHER_CTX *ctx;
    int len;
    int plaintext_len;

    if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();
    if(1 != EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv)) handleErrors();
    if(1 != EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len)) handleErrors();
    plaintext_len = len;
    if(1 != EVP_DecryptFinal_ex(ctx, plaintext + len, &len)) handleErrors();
    plaintext_len += len;
    EVP_CIPHER_CTX_free(ctx);
    return plaintext_len;
}

int main() {
    // 示例使用encrypt和decrypt函数
    return 0;
}

gcc -o my_program my_program.c -lssl -lcrypto