src: improve SPKAC::ExportChallenge()
Declare buf as an unsigned char* to get rid of the reinterpret_cast and do not ignore the return value of ASN1_STRING_TO_UTF8(). This also removes the need to call strlen() on the result.
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Declare buf as an unsigned char* to get rid of the reinterpret_cast and do not ignore the return value of ASN1_STRING_TO_UTF8(). This also removes the need to call strlen() on the result.