如何在没有 p、q 等的情况下加载 RSA 密钥对

2022-01-07 00:00:00 c openssl c++

我试图找到一种仅使用 n、e、d 将 RSA 密钥对加载到 Openssl 的方法.根据 RSA 的 openssl 文档，这些组件(p、q 等)可以为 NULL，但我设法找到的唯一加载密钥的函数是 i2d_RSAPrivateKey/i2d_RSAPublicKey.不幸的是，这些功能仅适用于 DER 格式的密钥.

I'm trying to find a way of loading RSA key pair to Openssl using only n, e, d. According to the openssl documentation for the RSA those components (p, q, etc) can be NULL, but the only function for loading keys I managed to find is i2d_RSAPrivateKey / i2d_RSAPublicKey. Unfortunally these functions work only with keys in DER format.

那么除了将它们直接处理到 RSA 结构中之外，还有什么方法可以加载我的密钥 (n, e, d)?

So is there any way to load my keys (n, e, d) except coping them directly into the RSA structure?

推荐答案

...这些功能仅适用于 DER 格式的密钥.

... these functions work only with keys in DER format.

OpenSSL 的 app.c 具有实用程序用来从文件加载密钥的代码(出于实际目的，文件或内存之间没有区别，因为您可以使用不同的 BIO代码>).其转载如下，并提供多种格式.

OpenSSL's app.c has the code the utility uses to load keys from a file (for practical purposes, there's no difference between file or memory because you can use a different BIO). Its reproduced below, and it offers a number of formats.

那么除了将它们直接处理到 RSA 结构中之外，还有什么方法可以加载我的密钥 (n, e, d)?

So is there any way to load my keys (n, e, d) except coping them directly into the RSA structure?

您的密钥是什么格式的?

What format are your keys in?

EVP_PKEY *load_key(BIO *err, const char *file, int format, int maybe_stdin,
                   const char *pass, ENGINE *e, const char *key_descrip)
{
    BIO *key=NULL;
    EVP_PKEY *pkey=NULL;
    PW_CB_DATA cb_data;

    cb_data.password = pass;
    cb_data.prompt_info = file;

    if (file == NULL && (!maybe_stdin || format == FORMAT_ENGINE))
    {
        BIO_printf(err,"no keyfile specified
");
        goto end;
    }
#ifndef OPENSSL_NO_ENGINE
    if (format == FORMAT_ENGINE)
    {
        if (!e)
            BIO_printf(err,"no engine specified
");
        else
        {
            pkey = ENGINE_load_private_key(e, file,
                                           ui_method, &cb_data);
            if (!pkey)
            {
                BIO_printf(err,"cannot load %s from engine
",key_descrip);
                ERR_print_errors(err);
            }
        }
        goto end;
    }
#endif
    key=BIO_new(BIO_s_file());
    if (key == NULL)
    {
        ERR_print_errors(err);
        goto end;
    }
    if (file == NULL && maybe_stdin)
    {
#ifdef _IONBF
# ifndef OPENSSL_NO_SETVBUF_IONBF
        setvbuf(stdin, NULL, _IONBF, 0);
# endif /* ndef OPENSSL_NO_SETVBUF_IONBF */
#endif
        BIO_set_fp(key,stdin,BIO_NOCLOSE);
    }
    else
        if (BIO_read_filename(key,file) <= 0)
        {
            BIO_printf(err, "Error opening %s %s
",
                       key_descrip, file);
            ERR_print_errors(err);
            goto end;
        }
    if (format == FORMAT_ASN1)
    {
        pkey=d2i_PrivateKey_bio(key, NULL);
    }
    else if (format == FORMAT_PEM)
    {
        pkey=PEM_read_bio_PrivateKey(key,NULL,
                                     (pem_password_cb *)password_callback, &cb_data);
    }
#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_RSA)
    else if (format == FORMAT_NETSCAPE || format == FORMAT_IISSGC)
        pkey = load_netscape_key(err, key, file, key_descrip, format);
#endif
    else if (format == FORMAT_PKCS12)
    {
        if (!load_pkcs12(err, key, key_descrip,
                         (pem_password_cb *)password_callback, &cb_data,
                         &pkey, NULL, NULL))
            goto end;
    }
#if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA) && !defined (OPENSSL_NO_RC4)
    else if (format == FORMAT_MSBLOB)
        pkey = b2i_PrivateKey_bio(key);
    else if (format == FORMAT_PVK)
        pkey = b2i_PVK_bio(key, (pem_password_cb *)password_callback,
                           &cb_data);
#endif
    else
    {
        BIO_printf(err,"bad input format specified for key file
");
        goto end;
    }
end:
    if (key != NULL) BIO_free(key);
    if (pkey == NULL)
    {
        BIO_printf(err,"unable to load %s
", key_descrip);
        ERR_print_errors(err);
    }
    return(pkey);
}

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