const type: asn1TagType

Tag type used by ASN.1/BER data elements.

const type: asn1DataElement

ASN.1/BER data element. This type is used for reading ASN.1/BER data.

const func asn1DataElement: getAsn1DataElement (in string: stri, inout integer: pos)

Read the header of an ASN.1/BER data element, from stri. It is assumed that the data element header starts at position pos. The function advances pos beyond the header to the actual data. The actual data can be read afterwards, with the function getData.

dataElem := getAsn1DataElement(asn1, pos);
if dataElem.tagType = tagObjectIdentifier then
  contentType := getData(asn1, pos, dataElem);
  ...

Returns:

the header of an ASN.1/BER data element.

const func string: getData (in string: stri, inout integer: pos, in asn1DataElement: dataElement)

Read the data of a given ASN.1/BER dataElement, from stri. It is assumed that the actual data starts at position pos. The function advances pos beyond the dataElement data.

Returns:

the data of the ASN.1/BER dataElement.

const proc: skipData (inout integer: pos, in asn1DataElement: dataElement)

Skip the data of a given ASN.1/BER dataElement, from stri. It is assumed that the actual data starts at position pos. The function advances pos beyond the dataElement data.

const func string: genAsn1Element (in asn1TagType: tagType, in string: data)

Create an ASN.1/BER data element from tagType and data.

Returns:

the ASN.1/BER data element as string.

const func string: genAsn1Integer (in string: data)

Create an integer ASN.1/BER data element from data. The tag type of the generated data element is tagInteger.

genAsn1Integer(bytes(123, SIGNED, BE))  returns  "\2;\1;{"

Returns:

the integer ASN.1/BER data element as string.

const func string: genAsn1String (in string: data)

Create a string ASN.1/BER data element from data. Depending on data the tag type of the generated data element is tagPrintableString, tagVisibleString or tagUTF8String.

genAsn1String("abc")  returns  "\19;\3;abc"
genAsn1String("#%&")  returns  "\26;\3;#%&"
genAsn1String("€")    returns  "\f\3;â\130;¬"

Returns:

the string ASN.1/BER data element as string.

const func string: genAsn1Sequence (in string: data)

Create a sequence ASN.1/BER data element from data. The tag type of the generated data element is tagSequence.

Returns:

the sequence ASN.1/BER data element as string.

const func string: genAsn1Set (in string: data)

Create a set ASN.1/BER data element from data. The tag type of the generated data element is tagSet.

Returns:

the set ASN.1/BER data element as string.

const func string: genExplicitAsn1Tag (in integer: tagNumber, in string: data)

Create an explicit ASN.1/BER tag with tagNumber from data.

Returns:

the explicit ASN.1/BER tag as string.