View source for Unit X.509

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=== Description ===
----

'''Ultibo X.509 interface unit'''

X.509 is a standard that defines the format of public key certificates. An X.509 certificate contains a public key and an identity (a hostname, or an organization, or an individual), and is either signed by a certificate authority or self-signed. When a certificate is signed by a trusted certificate authority, or validated by other means, someone holding that certificate can rely on the public key it contains to establish secure communications with another party, or validate documents digitally signed by the corresponding private key.

This unit currently only provides the basic functionality required to read and parse an X.509 certificate in DER or PEM format and extract basic information such as the issuer, subject, validity, algorithm and public key.
 
It is expected that this unit will be expanded to incorporate additional functions over time.

=== Constants ===
----


<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 specific constants''' <code> X509_* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>X509_MAX_NAME_ATTRIBUTES = 20;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>X509_MAX_SERIAL_NUM_LEN = 20;</code>
| &nbsp;
|-
|}
</div></div>
<br /> 
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 name attribute''' <code> X509_NAME_ATTR_* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>X509_NAME_ATTR_NONE = 0;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>X509_NAME_ATTR_DC = 1;</code>
| &nbsp;
|-
| <code>X509_NAME_ATTR_CN = 2;</code>
| &nbsp;
|-
| <code>X509_NAME_ATTR_C = 3;</code>
| &nbsp;
|-
| <code>X509_NAME_ATTR_L = 4;</code>
| &nbsp;
|-
| <code>X509_NAME_ATTR_ST = 5;</code>
| &nbsp;
|-
| <code>X509_NAME_ATTR_O = 6;</code>
| &nbsp;
|-
| <code>X509_NAME_ATTR_OU = 7;</code>
| &nbsp;
|-
|}
</div></div>
<br /> 
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 validate''' <code> X509_VALIDATE_* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>X509_VALIDATE_OK = 0;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>X509_VALIDATE_BAD_CERTIFICATE = 1;</code>
| &nbsp;
|-
| <code>X509_VALIDATE_UNSUPPORTED_CERTIFICATE = 2;</code>
| &nbsp;
|-
| <code>X509_VALIDATE_CERTIFICATE_REVOKED = 3;</code>
| &nbsp;
|-
| <code>X509_VALIDATE_CERTIFICATE_EXPIRED = 4;</code>
| &nbsp;
|-
| <code>X509_VALIDATE_CERTIFICATE_UNKNOWN = 5;</code>
| &nbsp;
|-
| <code>X509_VALIDATE_UNKNOWN_CA = 6;</code>
| &nbsp;
|-
|}
</div></div>
<br /> 
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 certificate version''' <code> X509_CERT_V* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>X509_CERT_V1 = 0;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>X509_CERT_V2 = 1;</code>
| &nbsp;
|-
| <code>X509_CERT_V3 = 2;</code>
| &nbsp;
|-
|}
</div></div>
<br /> 
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 certificate extension''' <code> X509_EXT_* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>X509_EXT_BASIC_CONSTRAINTS = (1 shl 0);</code>
| style="width: 50%;"|&nbsp;
|-
| <code>X509_EXT_PATH_LEN_CONSTRAINT = (1 shl 1);</code>
| &nbsp;
|-
| <code>X509_EXT_KEY_USAGE = (1 shl 2);</code>
| &nbsp;
|-
| <code>X509_EXT_SUBJECT_ALT_NAME = (1 shl 3);</code>
| &nbsp;
|-
| <code>X509_EXT_ISSUER_ALT_NAME = (1 shl 4);</code>
| &nbsp;
|-
| <code>X509_EXT_EXT_KEY_USAGE = (1 shl 5);</code>
| &nbsp;
|-
|}
</div></div>
<br /> 
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 certificate key usage''' <code> X509_KEY_USAGE_* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
|colspan="2"|Note: RFC5280 Section 4.2.1.3. - Key Usage
|-
| <code>X509_KEY_USAGE_DIGITAL_SIGNATURE = (1 shl 0);</code>
| digitalSignature - The digitalSignature bit is asserted when the subject public key is used for verifying digital signatures, other than signatures on certificates.
|-
| <code>X509_KEY_USAGE_NON_REPUDIATION = (1 shl 1);</code>
| nonRepudiation - The nonRepudiation bit is asserted when the subject public key is used to verify digital signatures, other than signatures on certificates.
|-
| <code>X509_KEY_USAGE_KEY_ENCIPHERMENT = (1 shl 2);</code>
| keyEncipherment - The keyEncipherment bit is asserted when the subject public key is used for enciphering private or secret keys, i.e., for key transport
|-
| <code>X509_KEY_USAGE_DATA_ENCIPHERMENT = (1 shl 3);</code>
| dataEncipherment - The dataEncipherment bit is asserted when the subject public key is used for directly enciphering raw user data without the use of an intermediate symmetric cipher.
|-
| <code>X509_KEY_USAGE_KEY_AGREEMENT = (1 shl 4);</code>
| keyAgreement - The keyAgreement bit is asserted when the subject public key is used for key agreement
|-
| <code>X509_KEY_USAGE_KEY_CERT_SIGN = (1 shl 5);</code>
| keyCertSign - The keyCertSign bit is asserted when the subject public key is used for verifying signatures on public key certificates
|-
| <code>X509_KEY_USAGE_CRL_SIGN = (1 shl 6);</code>
| cRLSign - The cRLSign bit is asserted when the subject public key is used for verifying signatures on certificate revocation lists
|-
| <code>X509_KEY_USAGE_ENCIPHER_ONLY = (1 shl 7);</code>
| encipherOnly -  When the encipherOnly bit is asserted and the keyAgreement bit is also set, the subject public key may be used only for enciphering data while performing key agreement.
|-
| <code>X509_KEY_USAGE_DECIPHER_ONLY = (1 shl 8);</code>
| decipherOnly - When the decipherOnly bit is asserted and the keyAgreement bit is also set, the subject public key may be used only for deciphering data while performing key agreement.
|-
|}
</div></div>
<br />  
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 certificate extended key usage''' <code> X509_EXT_KEY_USAGE_* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>X509_EXT_KEY_USAGE_ANY = (1 shl 0);</code>
| style="width: 50%;"|&nbsp;
|-
| <code>X509_EXT_KEY_USAGE_SERVER_AUTH = (1 shl 1);</code>
| &nbsp;
|-
| <code>X509_EXT_KEY_USAGE_CLIENT_AUTH = (1 shl 2);</code>
| &nbsp;
|-
| <code>X509_EXT_KEY_USAGE_OCSP = (1 shl 3);</code>
| &nbsp;
|-
|}
</div></div>
<br />
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 20px; padding-bottom: 15px;">
<div style="font-size: 14px; padding-left: 12px;">'''X509 certificate file types''' <code> NAME_* </code></div>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>X509_FILETYPE_PEM = 1;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>X509_FILETYPE_ASN1 = 2;</code>
| &nbsp;
|-
|}
</div></div>
<br />

=== Type definitions ===
----


'''X509 serial number'''

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<code>PX509SerialNumber = ^TX509SerialNumber;</code>

<code>TX509SerialNumber = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>Value:array[0..X509_MAX_SERIAL_NUM_LEN - 1] of Byte;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>Length:Integer;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ToString:String;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 name attribute'''  

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<code>PX509NameAttribute = ^TX509NameAttribute;</code>

<code>TX509NameAttribute = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>Value:String;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>_Type:LongWord;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ToString:String;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 name attributes'''  

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
<code>PX509NameAttributes = ^TX509NameAttributes;</code>

<code>TX509NameAttributes = array[0..X509_MAX_NAME_ATTRIBUTES - 1] of TX509NameAttribute;</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| &nbsp;
| style="width: 50%;"|&nbsp;
|-
|}
</div></div>

'''X509 algorithm identifier'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
<code>PX509AlgorithmIdentifier = ^TX509AlgorithmIdentifier;</code>

<code>TX509AlgorithmIdentifier = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>OID:TASN1OID;</code>
| style="width: 50%;"|&nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ToString:String;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 public key'''

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<code>PX509PublicKey = ^TX509PublicKey;</code>

<code>TX509PublicKey = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>Algorithm:TX509AlgorithmIdentifier;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>Key:PByte;</code>
| &nbsp;
|-
| <code>Length:Integer;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>procedure Release;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ToString:String;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 private key'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
<code>PX509PrivateKey = ^TX509PrivateKey;</code>

<code>TX509PrivateKey = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
|colspan="2"|Note: RFC3447 - Appendix A.1.2 - RSA private key syntax
|-
|colspan="2"|&nbsp;
|-
| <code>Algorithm:TX509AlgorithmIdentifier;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>Key:PByte;</code>
| &nbsp;
|-
| <code>Length:Integer;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>procedure Release;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ToString:String;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 signature'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
<code>PX509Signature = ^TX509Signature;</code>

<code>TX509Signature = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>Algorithm:TX509AlgorithmIdentifier;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>Value:PByte;</code>
| &nbsp;
|-
| <code>Length:Integer;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>procedure Release;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 RSA public key'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
<code>PX509RSAPublicKey = ^TX509RSAPublicKey;</code>

<code>TX509RSAPublicKey = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>Modulus:PByte;</code>
| M
|-
| <code>PublicExponent:PByte;</code>
| E
|-
|colspan="2"|&nbsp;
|-
| <code>ModulusLen:Integer;</code>
| &nbsp;
|-
| <code>PublicExponentLen:Integer;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>procedure Release;</code>
| &nbsp;
|-
|}
</div></div>
  
'''X509 RSA private key'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
<code>PX509RSAPrivateKey = ^TX509RSAPrivateKey;</code>

<code>TX509RSAPrivateKey = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>Version:Integer;</code>
| &nbsp;
|-
| <code>Modulus:PByte;</code>
| M
|-
| <code>PublicExponent:PByte;</code>
| E
|-
| <code>PrivateExponent:PByte;</code>
| D
|-
| <code>Prime1:PByte;</code>
| P
|-
| <code>Prime2:PByte;</code>
| Q
|-
| <code>Exponent1:PByte;</code>
| D mod (P - 1)
|-
| <code>Exponent2:PByte;</code>
| D mod (Q - 1)
|-
| <code>Coefficient:PByte;</code>
| (Inverse of Q) mod P
|-
|colspan="2"|&nbsp;
|-
| <code>ModulusLen:Integer;</code>
| &nbsp;
|-
| <code>PublicExponentLen:Integer;</code>
| &nbsp;
|-
| <code>PrivateExponentLen:Integer;</code>
| &nbsp;
|-
| <code>Prime1Len:Integer;</code>
| &nbsp;
|-
| <code>Prime2Len:Integer;</code>
| &nbsp;
|-
| <code>Exponent1Len:Integer;</code>
| &nbsp;
|-
| <code>Exponent2Len:Integer;</code>
| &nbsp;
|-
| <code>CoefficientLen:Integer;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>procedure Release;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 ECDSA public key'''

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<code>PX509ECDSAPublicKey = ^TX509ECDSAPublicKey;</code>

<code>TX509ECDSAPublicKey = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>procedure Release;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 ECDSA private key'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
<code>PX509ECDSAPrivateKey = ^TX509ECDSAPrivateKey;</code>

<code>TX509ECDSAPrivateKey = record</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
| <code>function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>procedure Release;</code>
| &nbsp;
|-
|}
</div></div>
<br />

=== Class definitions ===
----


'''X509 name'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">

<code>TX509Name = class(TObject)</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''private'''</div>
|-
| <code>function StringCompare(const AValue1,AValue2:String):Integer;</code>
| &nbsp;
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''public'''</div>
|-
| <code>NameAttributes:TX509NameAttributes;</code>
| &nbsp;
|-
| <code>NameAttributeCount:LongWord;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>Email:String;</code>
| emailAddress
|-
|colspan="2"|''From subjectAltName extension''
|-
| <code>AltEmail:String;</code>
| rfc822Name
|-
| <code>DNS:String;</code>
| dNSName
|-
| <code>URI:String;</code>
| uniformResourceIdentifier
|-
| <code>IP:PByte;</code>
| iPAddress
|-
| <code>IPLen:Longword;</code>
| IPv4 = 4,IPv6 = 16
|-
| <code>RegisteredID:TASN1OID;</code>
| registeredID
|-
|colspan="2"|&nbsp;
|-
| <code>destructor Destroy; override;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function GetCN:String;</code>
| &nbsp;
|-
| <code>function GetDN:String;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function Compare(AName:TX509Name):Integer;</code>
| &nbsp;
|-
|}
</div></div>
 
'''X509 certificate'''  
 
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">

<code>TX509Certificate = class;</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''private'''</div>
|-
|colspan="2"|&nbsp;
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''public'''</div>
|-
|colspan="2"|&nbsp;
|-
|}
</div></div> 
 
'''X509 certificate list'''  

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">

<code>TX509CertificateList = class(TObject)</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''protected'''</div>
|-
| <code>FList:TList;</code>
| style="width: 50%;"|&nbsp;
|-
| <code>FLock: TCriticalSectionHandle;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>procedure Clear;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function AcquireLock:Boolean;</code>
| &nbsp;
|-
| <code>function ReleaseLock:Boolean;</code>
| &nbsp;
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''public'''</div>
|-
| <code>constructor Create;</code>
| &nbsp;
|-
| <code>destructor Destroy; override;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function First:TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function Last:TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function Prev(ACertificate:TX509Certificate):TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function Next(ACertificate:TX509Certificate):TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function Add(ACertificate:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function Remove(ACertificate:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function FindByIssuer(AName:TX509Name):TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function FindBySubject(AName:TX509Name):TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportDER(ABuffer:Pointer; ASize:Integer):TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function ImportPEM(ABuffer:Pointer; var ASize:Integer):TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ExportDER(ABuffer:Pointer; var ASize:Integer; ACertificate:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function ExportPEM(ABuffer:Pointer; var ASize:Integer; AStart:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
|}
</div></div>

'''X509 certificate chain''' 

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">

<code>TX509CertificateChain = class(TObject)</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''protected'''</div>
|-
| <code>FRoot:TX509Certificate;</code>
|  style="width: 50%;"|&nbsp;
|-
| <code>FLock: TCriticalSectionHandle;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>procedure Clear; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function AcquireLock:Boolean;</code>
| &nbsp;
|-
| <code>function ReleaseLock:Boolean;</code>
| &nbsp;
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''public'''</div>
|-
| <code>property Root:TX509Certificate read FRoot;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>constructor Create(ARoot:TX509Certificate); virtual;</code>
| &nbsp;
|-
| <code>destructor Destroy; override;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function Last:TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function Prev(ACertificate:TX509Certificate):TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function Next(ACertificate:TX509Certificate):TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function InsertAfter(AParent,ACertificate:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function InsertBefore(AChild,ACertificate:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function Remove(ACertificate:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function FindByIssuer(AName:TX509Name):TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function FindBySubject(AName:TX509Name):TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function FindBySubjectCN(const AName:String):TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function FindBySubjectDN(const AName:String):TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportDER(ABuffer:Pointer; ASize:Integer; AParent:TX509Certificate):TX509Certificate; virtual;</code>
| &nbsp;
|-
| <code>function ImportPEM(ABuffer:Pointer; var ASize:Integer; AParent:TX509Certificate):TX509Certificate; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ExportDER(ABuffer:Pointer; var ASize:Integer; ACertificate:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function ExportPEM(ABuffer:Pointer; var ASize:Integer; AStart:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function GetPathLength(ACertificate:TX509Certificate):LongWord; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ValidateChain(ATrust:TX509CertificateList):Integer; virtual;</code>
| &nbsp;
|-
|}
</div></div>
  
'''X509 certificate'''

<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">

<code>TX509Certificate = class(TObject)</code>
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
{| class="wikitable" style="font-size: 14px; background: white;"
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''protected'''</div>
|-
| <code>FList:TX509CertificateList;</code>
| &nbsp;
|-
| <code>FChain:TX509CertificateChain;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>FParent:TX509Certificate;</code>
| &nbsp;
|-
| <code>FChild:TX509Certificate;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>FData:PByte;</code>
| Copy of certificate data from import
|-
| <code>FSize:LongWord;</code>
| Total size of certificate data
|-
|colspan="2"|&nbsp;
|-
| <code>FTBSData:PByte;</code>
| Pointer to start of TBS (To Be Signed) data
|-
| <code>FTBSSize:LongWord;</code>
| Length of TBS (To Be Signed) data
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportTime(ABuffer:PByte; ASize:Integer; ATag:LongWord  ADateTime:TDateTime):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportName(ABuffer:PByte; ASize:Integer; AName:TX509Name; var ANext:PByte):Boolean;</code>
| &nbsp;
|-
| <code>function ImportExtensionAltName(ABuffer:PByte; ASize:Integer; AName:TX509Name):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportAlgorithmIdentifier(ABuffer:PByte; ASize:Integer; var AIdentifier:TX509AlgorithmIdentifier; var ANext:PByte):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportValidity(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportPublicKey(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportExtension(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;</code>
| &nbsp;
|-
| <code>function ImportExtensionData(ABuffer:PByte; ASize:Integer; const AOID:TASN1OID):Boolean;</code>
| &nbsp;
|-
| <code>function ImportExtensionKeyUsage(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function ImportExtensionSubjectAltName(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function ImportExtensionIssuerAltName(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function ImportExtensionBasicContraints(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function ImportExtensionExtKeyUsage(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportExtensions(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportTBSCertificate(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function VerifyRSASignature(AIssuer:TX509Certificate):Boolean;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function VerifyMD5Digest(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function VerifySHA1Digest(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function VerifySHA256Digest(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function VerifySHA384Digest(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
| <code>function VerifySHA512Digest(ABuffer:PByte; ASize:Integer):Boolean;</code>
| &nbsp;
|-
|colspan="2"|<div style="font-family: monospace,courier;">'''public'''</div>
|-
|colspan="2"|''Properties''
|-
| <code>Version:LongWord;</code>
| &nbsp;
|-
| <code>SerialNumber:TX509SerialNumber;</code>
| &nbsp;
|-
| <code>SignatureAlgorithm:TX509AlgorithmIdentifier;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>Issuer:TX509Name;</code>
| &nbsp;
|-
| <code>Subject:TX509Name;</code>
| &nbsp;
|-
| <code>SubjectDN:String;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>NotBefore:TDateTime;</code>
| &nbsp;
|-
| <code>NotAfter:TDateTime;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>PublicKey:TX509PublicKey;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>Signature:TX509Signature;</code>
| &nbsp;
|-
|colspan="2"|''Extensions''
|-
| <code>ExtensionsPresent:LongWord;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>CA:Boolean;</code>
| &nbsp;
|-
| <code>PathLenConstraint:LongWord;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>KeyUsage:LongWord;</code>
| &nbsp;
|-
| <code>ExtendedKeyUsage:LongWord;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>property List:TX509CertificateList read FList;</code>
| &nbsp;
|-
| <code>property Chain:TX509CertificateChain read FChain;</code>
| &nbsp;
|-
| <code>property Parent:TX509Certificate read FParent;</code>
| &nbsp;
|-
| <code>property Child:TX509Certificate read FChild;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>constructor Create(AChain:TX509CertificateChain; AParent:TX509Certificate); virtual;</code>
| &nbsp;
|-
| <code>destructor Destroy; override;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function ImportPEM(ABuffer:Pointer; var ASize:Integer):Boolean; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function ExportDER(ABuffer:Pointer; var ASize:Integer):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function ExportPEM(ABuffer:Pointer; var ASize:Integer):Boolean; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function IsValidIssuer:Boolean; virtual;</code>
| &nbsp;
|-
| <code>function IsSelfSigned:Boolean; virtual;</code>
| &nbsp;
|-
|colspan="2"|&nbsp;
|-
| <code>function VerifySignature(AIssuer:TX509Certificate):Boolean; virtual;</code>
| &nbsp;
|-
| <code>function ValidateCertificate(AIssuer:TX509Certificate):Integer; virtual;</code>
| &nbsp;
|-
|}
</div></div>
<br />

=== Public variables ===
----

''None defined''

=== Function declarations ===
----


'''X509 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 X509NameAttributeTypeToString(AType:LongWord):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 />

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