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Debian Buster updated /etc/ssl/openssl.cnf to default to MinProtocol = TLSv1.2 CipherString = DEFAULT@SECLEVEL=2 gentls_cert currently uses SHA1 as message digest. According to OpenSSL documentation this only offers 80 bit of security. 80 bits is enough for security level 1, but not 2. The OpenSSL default MD nowadays is SHA256. This commit updates gentls_cert to use it. Issue was reported on the FS mailing list. The certificates created by gentls_cert caused "md too weak" errors and clients were unable to connect. Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>