use SHA-256 for OpenSSL certificates

mk-self-signed-ssl-certificate

@@ -8,5 +8,5 @@ fi
 openssl genrsa -des3 -passout pass:x -out ${name}.pass.key 2048
 openssl rsa -passin pass:x -in ${name}.pass.key -out ${name}.key
 rm ${name}.pass.key
-openssl req -new -key ${name}.key -out ${name}.csr
-openssl x509 -req -days 365 -in ${name}.csr -signkey ${name}.key -out ${name}.crt
+openssl req -new -sha256 -key ${name}.key -out ${name}.csr
+openssl x509 -req -sha256 -days 365 -in ${name}.csr -signkey ${name}.key -out ${name}.crt