#include <openssl/ssl.h> unsigned int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *prefix);
If the SSL_CONF_FLAG_CMDLINE flag is set then prefix checks are case sensitive and "-" is the default. In the unlikely even an application explicitly wants to set no prefix it must be explicitly set to "".
If the SSL_CONF_FLAG_FILE flag is set then prefix checks are case insensitive and no prefix is the default.
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