Re: OpenSSL 3.4.0 - Key too small error with key size 1024

Hi Tomas,
Thank you for your response.
After setting the security level to '0', 1024 is working fine.
Could you please let us know the security implications for setting security
level to 0.

Thanks & Regards,
Samiya khanum


On Fri, Dec 20, 2024 at 7:43 PM Tomas Mraz <[email protected]> wrote:

> Yes, you have to set the security level to 0 to be able to use 1024 bit
> RSA and DH keys. You can use SSL_CTX_set_security_level() function to
> do this.
>
> Of course you should do it only for legacy purposes as such short keys
> do not provide sufficient security protections.
>
> Tomas Mraz, OpenSSL
>
> On Fri, 2024-12-20 at 19:39 +0530, 'Samiya Khanum' via openssl-users
> wrote:
> > Hi all,
> > With openssl 3.4.0 code we are able to generate certificates with key
> > size 1024 and DH param size 1024. Getting the below error when trying
> > to use  these certificates for launching a secure http server.
> >
> > SSL connect err code:[167772559](error:0A00018F:SSL routines::ee key
> > too small)
> > Error is ee key too small
> >
> > We would like to know is  openSSL 3.4.0 supports certificate key size
> > 1024.
> > Same api(SSL_CTX_use_certificate) is working fine in 3.1.6.
> >
> > Is any configuration required to support key size 1024 for legacy
> > applications interaction
> >
> > /// Code snippet
> >  int err = 0;
> > SSL_CTX  *ctx = NULLPTR;
> > EVP_PKEY *pkey = NULLPTR;
> > X509     *cert = NULLPTR;
> > SSL_load_error_strings();
> >  ERR_load_crypto_strings();
> >
> >  ctx = SSL_CTX_new(SSLv23_method());
> >  if (ctx == NULL){
> >       printf("ssl ctx create error");
> >       return -1
> >   }
> >   fp = opensslFileOpen("mycert.pem");
> >   if (fp == NULL) {
> >       printf("file open error");
> >       return -1
> >   }
> >   cert = PEM_read_X509(fp, NULL, NULL, NULL);
> >   if (cert == NULL) {
> >       printf("file open error");
> >      return -1
> >   }
> >   if (!SSL_CTX_use_certificate(ctx, cert)) {
> >       int err = 0;
> >       if((err = ERR_get_error())) {
> >          printf("SSL connect err code:[%d](%s)\n", err,
> > ERR_error_string(err, NULL));
> >          printf("Error is %s \n",ERR_reason_error_string(err));
> >          return  -1;
> >     }
> > }
> >
> >
> > Thanks & Regards,
> > Samiya khanum
> >
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> --
> Tomáš Mráz, OpenSSL
>
>

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