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Reply to topic   Topic: supported ecdsa curves?
Author
mrdj1024



Joined: 03 Apr 2023
Posts: 64
Location: Bridgeton,NJ,USA
PostPosted: Thu 10 Jul '25 2:10    Post subject: supported ecdsa curves? Reply with quote
hi!
so i found a free self signed ssl cert generator and it gives options to generate edwards curves or brainpool curves but when i put my cert on my ssl conf file it says no supported curves
are we forced to use the p-256 curve?
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7415
Location: EU, Germany, Next to Hamburg
PostPosted: Thu 10 Jul '25 11:45    Post subject: Reply with quote
The used curves are not the cipher.

You can define the used curves via SSLOpenSSLConfCmd

e.g.
Code:

SSLCipherSuite SSL ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES256-GCM-SHA384
SSLCipherSuite TLSv1.3 TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384

SSLOpenSSLConfCmd ECDHParameters secp521r1
SSLOpenSSLConfCmd Curves secp521r1:secp384r1


or

for like SSL TR-03116-4 Apache config from Bundesamts für Sicherheit in der Informationstechnik (BSI)

Code:

SSLOpenSSLConfCmd ECDHParameters secp521r1
SSLOpenSSLConfCmd Curves X25519:secp521r1:secp384r1:brainpoolP256r1
SSLOpenSSLConfCmd SignatureAlgorithms "ECDSA+SHA512:ECDSA+SHA384:ECDSA+SHA256:RSA+SHA512:RSA+SHA384:RSA+SHA256:rsa_pss_rsae_sha512:rsa_pss_rsae_sha384:rsa_pss_rsae_sha256"
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mrdj1024



Joined: 03 Apr 2023
Posts: 64
Location: Bridgeton,NJ,USA
PostPosted: Thu 10 Jul '25 12:45    Post subject: Reply with quote
thanks for the reply i get this message
ERR_SSL_VERSION_OR_CIPHER_MISMATCH
using latest apache 2.4.63 from apachelounge on windows
heres whats in my file
------------------------------------------------------------
SSLProtocol -all +TLSv1.2 +TLSv1.3
SSLCompression Off
SSLProxyProtocol -all +TLSv1.2 +TLSv1.3
SSLOpenSSLConfCmd ECDHParameters secp521r1
SSLOpenSSLConfCmd Curves X25519:secp521r1:secp384r1:brainpoolP256r1
SSLOpenSSLConfCmd SignatureAlgorithms "ECDSA+SHA512:ECDSA+SHA384:ECDSA+SHA256:RSA+SHA512:RSA+SHA384:RSA+SHA256:rsa_pss_rsae_sha512:rsa_pss_rsae_sha384:rsa_pss_rsae_sha256"
----------------------------------------------------------
SSLCipherSuite SSL ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES256-GCM-SHA384
SSLCipherSuite TLSv1.3 TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384
----------------------------------------------------------
im wanting to use all brainpool for my server so what do i need to do to make it secure?
EDIT: am using a brainpool256r1 key
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7415
Location: EU, Germany, Next to Hamburg
PostPosted: Tue 15 Jul '25 9:16    Post subject: Reply with quote
A fully working SSL config is available at https://github.com/JBlond/debian_build_apache24/blob/master/ssl-bsi-tr-03116-4.conf

If that doesn't work, you have to go into debugging using the LogLevel for the SSL module.


Code:
 <IfModule mod_ssl.c>
    ErrorLog /var/log/apache2/ssl_engine.log
    LogLevel debug
  </IfModule>


For more info, see http://wiki.apache.org/httpd/DebuggingSSLProblems

if you still have a question, please ask again.
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