C++ 使用AES“U 256”CBC return“解密文件；“解密错误”；错误

这是这个问题的后续问题：

我正试图解密一个文件。起初我把它读成ASCII文件而不是二进制文件。修复（我希望如此）并将其作为二进制文件读取时，我总是会遇到一个

错误“bad decrypt”

错误：

15208:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:crypto\evp\evp_enc.c:570:

以下是我如何加密和解密的示例：

加密：

Cipher cipher;
ifstream f("d:/test.YML");
ofstream out("d:/temp.YML");
byte key[KEY_SIZE] = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2};
byte iv[BLOCK_SIZE] = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6};

secure_string line;
secure_string temp;
while (getline(f, line)) {
    cipher.Encrypt(key, iv, line, temp);
    out << temp << endl;
}

密码；
ifstream f（“d:/test.YML”）；
流出量（“d:/temp.YML”）；
字节键[键大小]={1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2}；
字节iv[块大小]={1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6}；
固定线绳；
安全字符串温度；
while（getline（f，line））{
加密（密钥、iv、行、临时）；
out您的代码中有许多问题……举几个例子：


“d:/temp.YML”）的流输出的
；
应以二进制模式打开
out为什么只在4个流中的1个流中指定
binary
？@rustyx:没错，我没有指定，但加密也需要它？在加密中，我将文件读为ascii@rustyx：我将它们全部更改为二进制并再次加密，但在解密时仍然存在相同的问题
Cipher cipher;
    ifstream f("d:/temp.YML", ifstream::binary);
    ofstream out("d:/tempDecrypt.YML");
    byte key[KEY_SIZE] = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2};
    byte iv[BLOCK_SIZE] = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6};

    secure_string temp;
    vector<char> buffer(1024, 0);

    while (!f.eof()) {
        f.read(buffer.data(), buffer.size());
        streamsize dataSize = f.gcount();
        secure_string chunk = { buffer.begin(), buffer.begin() + dataSize };

        cipher.Decrypt(key, iv, chunk, temp);
    }

#include <cstdint>
#include <fstream>
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <string.h>
#include <stdio.h>

static const size_t KEY_SIZE = 256 / 8, BLOCK_SIZE = 128 / 8;

class AESBase {
protected:
    const uint8_t *key, *iv;
    EVP_CIPHER_CTX *ctx;
    AESBase(const uint8_t *key, const uint8_t *iv) : key(key), iv(iv) {
        if (!(ctx = EVP_CIPHER_CTX_new()))
            handleErrors();
    }
    ~AESBase() {
        EVP_CIPHER_CTX_free(ctx);
    }
    static void handleErrors(void) {
        ERR_print_errors_fp(stderr);
        abort();
    }
};

class Encrypt : AESBase {
public:
    Encrypt(const uint8_t *key, const uint8_t *iv) : AESBase(key, iv) {
        if (1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv))
            handleErrors();
    }
    int update(const char *plaintext, int plaintext_len, char *ciphertext) {
        int len;
        if (1 != EVP_EncryptUpdate(ctx, (uint8_t*)ciphertext, &len, (const uint8_t*)plaintext, plaintext_len))
            handleErrors();
        return len;
    }
    int final(char *ciphertext) {
        int len;
        if (1 != EVP_EncryptFinal_ex(ctx, (uint8_t*)ciphertext, &len))
            handleErrors();
        return len;
    }
};

class Decrypt : AESBase {
public:
    Decrypt(const uint8_t *key, const uint8_t *iv) : AESBase(key, iv) {
        if (1 != EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv))
            handleErrors();
    }
    int update(const char *ciphertext, int ciphertext_len, char *plaintext) {
        int len;
        if (1 != EVP_DecryptUpdate(ctx, (uint8_t*)plaintext, &len, (const uint8_t*)ciphertext, ciphertext_len))
            handleErrors();
        return len;
    }
    int final(char *plaintext) {
        int len;
        if (1 != EVP_DecryptFinal_ex(ctx, (uint8_t*)plaintext, &len))
            handleErrors();
        return len;
    }
};

void test_encrypt(const uint8_t *key, const char* in, const char* out) {
    std::ifstream fin(in, std::ios_base::binary);
    std::ofstream fout(out, std::ios_base::binary);
    uint8_t iv[BLOCK_SIZE];
    RAND_bytes(iv, sizeof(iv));

    char buf[1024], temp[sizeof(buf) + BLOCK_SIZE];
    Encrypt aes(key, iv);
    fout.write((char*)iv, sizeof(iv));
    while (fin) {
        fin.read(buf, sizeof(buf));
        int len = (int)fin.gcount();
        if (len <= 0)
            break;
        len = aes.update(buf, len, temp);
        fout.write(temp, len);
    }
    int len = aes.final(temp);
    fout.write(temp, len);
}

void test_decrypt(const uint8_t *key, const char* in, const char* out) {
    std::ifstream fin(in, std::ios_base::binary);
    std::ofstream fout(out, std::ios_base::binary);
    uint8_t iv[BLOCK_SIZE];
    fin.read((char*)iv, sizeof(iv));

    char buf[1024], temp[sizeof(buf) + BLOCK_SIZE];
    Decrypt aes(key, iv);
    while (fin) {
        fin.read(buf, sizeof(buf));
        int len = (int)fin.gcount();
        if (len <= 0)
            break;
        len = aes.update(buf, len, temp);
        fout.write(temp, len);
    }
    int len = aes.final(temp);
    fout.write(temp, len);
}

int main()
{
    ERR_load_crypto_strings();
    OpenSSL_add_all_algorithms();
    OPENSSL_config(NULL);

    uint8_t key[KEY_SIZE] = { 1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2 };
    test_encrypt(key, "main.cpp", "main.cpp.enc");
    test_decrypt(key, "main.cpp.enc", "main.cpp.txt");
}