mbedtls_asn1_get_tag() function

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

Syntax

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Declaration

Definition

from asn1.h:223

int mbedtls_asn1_get_tag(unsigned char **p, const unsigned char *end, size_t *len, int tag);

Implemented in asn1parse.c:89

Arguments

Argument

Description

On entry, \c *p points to the start of the ASN.1 element. On successful completion, \c *p points to the first byte after the length, i.e. the first byte of the content. On error, the value of \c *p is undefined.

end

End of data.

len

On successful completion, \c *len contains the length read from the ASN.1 input.

tag

The expected tag.

Return value

0 if successful. #MBEDTLS_ERR_ASN1_UNEXPECTED_TAG if the data does not start with the requested tag. #MBEDTLS_ERR_ASN1_OUT_OF_DATA if the ASN.1 element would end beyond \p end. #MBEDTLS_ERR_ASN1_INVALID_LENGTH if the length is unparsable.

Examples

References

from examples

mbedtls_asn1_get_tag() function

Syntax

Arguments

Return value

Examples

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