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@deftypefun {int} {asn1_get_tag_der} (const unsigned char * @var{der}, int @var{der_len}, unsigned char * @var{class}, int * @var{len}, unsigned long * @var{tag})
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@var{der}: DER data to decode.
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@var{der_len}: Length of DER data to decode.
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@var{class}: Output variable containing decoded class.
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@var{len}: Output variable containing the length of the DER TAG data.
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@var{tag}: Output variable containing the decoded tag.
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Decode the class and TAG from DER code.
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@strong{Return value:} Returns ASN1_SUCCESS on success, or an error.