asn1_get_length_der - API function
long asn1_get_length_der(const unsigned char * der, int der_len, int * len);
Extract a length field from DER data.
Return the decoded length value, or -1 on indefinite length, or -2 when the value was too big to fit in a int, or -4 when the decoded length value plus len would exceed der_len .
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