Difference between revisions of "Unit ASN.1"

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''To be documented''
 
  
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'''ASN1 functions'''
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
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<pre style="border: 0; padding-bottom:0px;">function ASN1GetTag(Buffer:PByte; Len:Integer; var Tag:TASN1Tag):Boolean;</pre>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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! Note
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| None documented
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|-
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|}
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</div></div>
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<br />
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
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<pre style="border: 0; padding-bottom:0px;">function ASN1ParseOID(Buffer:PByte; Len:Integer; var OID:TASN1OID):Boolean;</pre>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Parse an OID value from the buffer</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
 +
! Note
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| None documented
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|-
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|}
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</div></div>
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<br />
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1GetOID(Buffer:PByte; Len:Integer; var OID:TASN1OID; var Next:PByte):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Read the next ASN1 tag from buffer and decode it as an OID value</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1GetNull(Buffer:PByte; Len:Integer; var Next:PByte):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Read the next ASN1 tag from buffer and decode it as a null value</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1ParseInt(Buffer:PByte; Len:Integer; var Value:Integer):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Parse an integer value from the buffer</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1ParseBigInt(Buffer:PByte; Len:Integer; var Value:PByte; var Size:Integer):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Parse a big integer value from the buffer (Does not include the leading negative byte if present)</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
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! Note
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| Memory allocated for Value must be freed by the caller when no longer required
 +
|-
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|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1GetInt(Buffer:PByte; Len:Integer; var Value:Integer; var Next:PByte):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Read the next ASN1 tag from buffer and decode it as an integer value</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1ParseBoolean(Buffer:PByte; Len:Integer; var Value:Boolean):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Parse a boolean value from the buffer</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1GetBoolean(Buffer:PByte; Len:Integer; var Value:Boolean; var Next:PByte):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Read the next ASN1 tag from buffer and decode it as a boolean value</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
 +
'''ASN1 helper functions'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1OIDEqual(const OID1,OID2:TASN1OID):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1OIDEqualPrefix(const OIDPrefix,OID:TASN1OID):Boolean;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1OIDToString(const OID:TASN1OID):String;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ASN1BitStringToLongWord(Buffer:PByte; Len:Integer):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' To be documented</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
  
 
Return to [[Unit_Reference|Unit Reference]]
 
Return to [[Unit_Reference|Unit Reference]]

Revision as of 00:45, 19 April 2018

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Description

Ultibo ASN.1 interface unit

Abstract Syntax Notation One (ASN.1) is an interface description language for defining data structures that can be serialized and deserialized in a standard, cross-platform way. It's broadly used in telecommunications and computer networking, and especially in cryptography.

This unit currently only provides the basic functionality required by X509 to read and parse a certificate in DER format.

It is expected that this unit will be expanded to incorporate additional functions over time.

Constants


[Expand]
ASN1 specific constants ASN1_*


Type definitions


ASN1 tag

[Expand]

PASN1Tag = ^TASN1Tag;

TASN1Tag = record

ASN1 OID

[Expand]

PASN1OID = ^TASN1OID;

TASN1OID = record


Public variables

None defined

Function declarations


ASN1 functions

[Expand] 
function ASN1GetTag(Buffer:PByte; Len:Integer; var Tag:TASN1Tag):Boolean;
Description: To be documented


[Expand] 
function ASN1ParseOID(Buffer:PByte; Len:Integer; var OID:TASN1OID):Boolean;
Description: Parse an OID value from the buffer


[Expand] 
function ASN1GetOID(Buffer:PByte; Len:Integer; var OID:TASN1OID; var Next:PByte):Boolean;
Description: Read the next ASN1 tag from buffer and decode it as an OID value


[Expand] 
function ASN1GetNull(Buffer:PByte; Len:Integer; var Next:PByte):Boolean;
Description: Read the next ASN1 tag from buffer and decode it as a null value


[Expand] 
function ASN1ParseInt(Buffer:PByte; Len:Integer; var Value:Integer):Boolean;
Description: Parse an integer value from the buffer


[Expand] 
function ASN1ParseBigInt(Buffer:PByte; Len:Integer; var Value:PByte; var Size:Integer):Boolean;
Description: Parse a big integer value from the buffer (Does not include the leading negative byte if present)


[Expand] 
function ASN1GetInt(Buffer:PByte; Len:Integer; var Value:Integer; var Next:PByte):Boolean;
Description: Read the next ASN1 tag from buffer and decode it as an integer value


[Expand] 
function ASN1ParseBoolean(Buffer:PByte; Len:Integer; var Value:Boolean):Boolean;
Description: Parse a boolean value from the buffer


[Expand] 
function ASN1GetBoolean(Buffer:PByte; Len:Integer; var Value:Boolean; var Next:PByte):Boolean;
Description: Read the next ASN1 tag from buffer and decode it as a boolean value


ASN1 helper functions

[Expand] 
function ASN1OIDEqual(const OID1,OID2:TASN1OID):Boolean;
Description: To be documented


[Expand] 
function ASN1OIDEqualPrefix(const OIDPrefix,OID:TASN1OID):Boolean;
Description: To be documented


[Expand] 
function ASN1OIDToString(const OID:TASN1OID):String;
Description: To be documented


[Expand] 
function ASN1BitStringToLongWord(Buffer:PByte; Len:Integer):LongWord;
Description: To be documented


Return to Unit Reference

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