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@@ -27,7 +27,9 @@ void usage(void)
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static const char* help_message = "%s usage: %s"
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" [-r HOST:port | -f X509 | -R RSA]"
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" [-a ATTACK]"
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- " \n";
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+ " \n"
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+ "If no argument is supplied, by default a public RSA key is expected "
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+ "to be read from the standard input.\n";
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fprintf(stderr, help_message,
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program_invocation_short_name,
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program_invocation_name);
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