asn1_get_length_der - API function
signed long asn1_get_length_der(const unsigned char * der, int der_len,
int * len);
const unsigned char * der
DER data to decode.
int der_len Length of DER data to decode.
int * len Output variable containing the length of the DER length
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.
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