* parse_string - pulls an octet string out of an ASN octet string type. * On entry, datalength is input as the number of valid bytes following * "data". On exit, it is returned as the number of valid bytes * following the beginning of the next object. * * "string" is filled with the octet string. * * Returns a pointer to the first byte past the end * of this object (i.e. the star
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