cc3xx_asn1_get_tag()

psa_status_t cc3xx_asn1_get_tag	(	unsigned char **	p,
		const unsigned char *	end,
		size_t *	len,
		int	tag )

Get the tag and length of the element. Check for the requested tag. Updates the pointer to immediately behind the tag and length.

Parameters

p	On entry, *p points to the start of the ASN.1 element. On successful completion, *p points to the first byte after the length, i.e. the first byte of the content. On error, the value of *p is undefined.
end	End of data.
len	On successful completion, *len contains the length read from the ASN.1 input.
tag	The expected tag.

Returns

PSA_SUCCESS if successful.

PSA_ERROR_BUFFER_TOO_SMALL if the buffer is too small.

PSA_ERROR_GENERIC_ERROR if any other error occured.