c++ - 错误 :FFFFFFFFFFFFFFFF:lib(255):func(4095):reason(4095) during RSA decyption

Question

我正在尝试使用 Qt Gui 在 C++ 中创建一个混合加密工具。(数据将使用 AES 256-CBC 加密，然后将 AES key RSA 加密并保存。)但此工具的 RSA 部分不起作用。我多次编写源代码，但在解密时总是出现相同的错误。

错误:FFFFFFFFFFFFFFFF:lib(255):func(4095):reason(4095)

我希望有人能帮助我获得一个有效的 RSA 加密 + 解密实现。

您可以在此处查看源代码或从我的保管箱下载测试 Qt 项目..

Dropbox 下载:https://db.tt/6HKsYRTa

源代码1.实现:

void MainWindow::rsaEncrypt()
{
    EVP_PKEY *pk = NULL;
    EVP_PKEY_CTX *ctx = NULL;

    QByteArray encrypted = QByteArray();

    //------------------------------------------------
    //--- READ PUBLIC KEY ----------------------------
    FILE *pkFile = fopen(ui->publicKeyPath->text().toStdString().c_str(), "r");
    if(pkFile == NULL) throw NULL;

    pk = PEM_read_PUBKEY(pkFile, NULL, NULL, NULL);
    if(pk == NULL) throw NULL;
    fclose(pkFile);
    //------------------------------------------------
    ctx = EVP_PKEY_CTX_new(pk, NULL);


    //------------------------------------------------
    //--- ENCRYPT DATA -------------------------------
    int err;

    err = EVP_PKEY_encrypt_init(ctx);
    if(err <= 0) throw NULL;

    err = EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PADDING);
    if(err <= 0) throw NULL;

    size_t outLen = 0;
    err = EVP_PKEY_encrypt(
                            ctx,
                            NULL,
                            &outLen,
                            (uchar*) ui->plainTextEdit->document()->toPlainText().toStdString().c_str(),
                            ui->plainTextEdit->document()->toPlainText().size()
    );
    if(err <= 0) throw NULL;
    encrypted.resize(outLen);

    err = EVP_PKEY_encrypt(
                            ctx,
                            (uchar*) encrypted.data(),
                            &outLen,
                            (uchar*) ui->plainTextEdit->document()->toPlainText().toStdString().c_str(),
                            ui->plainTextEdit->document()->toPlainText().size()
    );
    //------------------------------------------------
    EVP_PKEY_CTX_free(ctx);
    EVP_PKEY_free(pk);

    if(err > 0) ui->encryptedTextEdit->document()->setPlainText(QString(encrypted));
    else {
            QByteArray errStr = QByteArray();
            errStr.resize(256);
            ERR_load_ERR_strings();
            ERR_error_string(err, errStr.data());
            ui->encryptedTextEdit->document()->setPlainText( QString(errStr) );
    }
}

void MainWindow::rsaDecrypt()
{
    EVP_PKEY *pk = NULL;
    EVP_PKEY_CTX *ctx = NULL;

    QByteArray decrypted = QByteArray();

    //------------------------------------------------
    //--- READ PRIVATE KEY ---------------------------
    FILE *pkFile = fopen(ui->privateKeyPath->text().toStdString().c_str(), "r");
    if(pkFile == NULL) throw NULL;

    pk = PEM_read_PrivateKey(pkFile, NULL, NULL, NULL);
    if(pk == NULL) throw NULL;
    fclose(pkFile);
    //------------------------------------------------
    ctx = EVP_PKEY_CTX_new(pk, NULL);


    //------------------------------------------------
    //--- DECRYPT DATA -------------------------------
    int err;

    err = EVP_PKEY_decrypt_init(ctx);
    if(err <= 0) throw NULL;

    err = EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PADDING);
    if(err <= 0) throw NULL;

    size_t outLen = 0;
    err = EVP_PKEY_decrypt(
                            ctx,
                            NULL,
                            &outLen,
                            (uchar*) ui->encryptedTextEdit->document()->toPlainText().toStdString().c_str(),
                            ui->encryptedTextEdit->document()->toPlainText().size()
    );
    if(err <= 0) throw NULL;
    decrypted.resize(outLen);

    err = EVP_PKEY_decrypt(
                            ctx,
                            (uchar*) decrypted.data(),
                            &outLen,
                            (uchar*) ui->encryptedTextEdit->document()->toPlainText().toStdString().c_str(),
                            ui->encryptedTextEdit->document()->toPlainText().size()
    );
    //------------------------------------------------
    EVP_PKEY_CTX_free(ctx);
    EVP_PKEY_free(pk);

    if(err > 0) ui->decryptedTextEdit->document()->setPlainText(QString(decrypted));
    else {
            QByteArray errStr = QByteArray();
            errStr.resize(256);
            ERR_load_ERR_strings();
            ERR_error_string(err, errStr.data());
            ui->decryptedTextEdit->document()->setPlainText( QString(errStr) );
    }
}

源代码2.实现:

void MainWindow::rsaEncrypt()
{
    RSA *rsa = createRSAFromFile(ui->publicKeyPath->text().toStdString().c_str(), 1);

    QByteArray encrypted = QByteArray();
    encrypted.resize(2048);

    int err = RSA_public_encrypt(
                    ui->plainTextEdit->document()->toPlainText().size(),
                    (uchar*) ui->plainTextEdit->document()->toPlainText().toStdString().c_str(),
                    (uchar*) encrypted.data(),
                    rsa,
                    RSA_PADDING
    );

    RSA_free(rsa);
    if(err > 0) ui->encryptedTextEdit->document()->setPlainText( QString(encrypted) );
    else {
            QByteArray errStr = QByteArray();
            errStr.resize(256);
            ERR_load_ERR_strings();
            ERR_error_string(err, errStr.data());
            ui->encryptedTextEdit->document()->setPlainText( QString(errStr) );
    }
}

void MainWindow::rsaDecrypt()
{
    RSA *rsa = createRSAFromFile(ui->privateKeyPath->text().toStdString().c_str(), 0);

    QByteArray decrypted = QByteArray();
    decrypted.resize(2048);

    int err = RSA_private_decrypt(
                    ui->encryptedTextEdit->document()->toPlainText().size(),
                    (uchar*) ui->encryptedTextEdit->document()->toPlainText().toStdString().c_str(),
                    (uchar*) decrypted.data(),
                    rsa,
                    RSA_PADDING
    );


    RSA_free(rsa);
    if(err > 0) ui->decryptedTextEdit->document()->setPlainText( QString(decrypted) );
    else {
            QByteArray errStr = QByteArray();
            errStr.resize(256);
            ERR_load_ERR_strings();
            ERR_error_string(err, errStr.data());
            ui->decryptedTextEdit->document()->setPlainText( QString(errStr) );
    }
}

RSA *MainWindow::createRSAFromFile(const char *keyPath, int pub)
{
    FILE *keyFile = fopen(keyPath, "rb");
    if(keyFile==NULL)
    {
            return 0;
    }
    RSA *rsa = RSA_new();

    if(pub)
    {
            rsa = PEM_read_RSA_PUBKEY(keyFile, &rsa, NULL, NULL);
    }
    else
    {
            rsa = PEM_read_RSAPrivateKey(keyFile, &rsa, NULL, NULL);
    }
    fclose(keyFile);
    return rsa;
}

包括并定义两种实现方式:

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QDebug>
#include <QByteArray>

#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>

#define RSA_PADDING RSA_PKCS1_OAEP_PADDING

Answer 1

尝试使用此代码创建 RSA 对象。它绝对有效。您应该先阅读 .pem 文件，然后调用此函数:

RSA *CryptClassRSA::createRSA(unsigned char *key, int isPublic){
    RSA *rsa = NULL;
    BIO *keybio;
    keybio = BIO_new_mem_buf(key, -1);
    if (keybio==NULL){
        printf( "Failed to create key BIO");
        return NULL;
    }
    if(isPublic){
        rsa = PEM_read_bio_RSA_PUBKEY(keybio, &rsa,NULL, NULL);
    }
    else{
        rsa = PEM_read_bio_RSAPrivateKey(keybio, &rsa,NULL, NULL);
    }
    if(rsa == NULL){
        printf( "Failed to create RSA");
    }

    return rsa;
}