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


X509 specific constants X509_*
X509_MAX_NAME_ATTRIBUTES = 20;  
X509_MAX_SERIAL_NUM_LEN = 20;  


X509 name attribute X509_NAME_ATTR_*
X509_NAME_ATTR_NONE = 0;  
X509_NAME_ATTR_DC = 1;  
X509_NAME_ATTR_CN = 2;  
X509_NAME_ATTR_C = 3;  
X509_NAME_ATTR_L = 4;  
X509_NAME_ATTR_ST = 5;  
X509_NAME_ATTR_O = 6;  
X509_NAME_ATTR_OU = 7;  


X509 validate X509_VALIDATE_*
X509_VALIDATE_OK = 0;  
X509_VALIDATE_BAD_CERTIFICATE = 1;  
X509_VALIDATE_UNSUPPORTED_CERTIFICATE = 2;  
X509_VALIDATE_CERTIFICATE_REVOKED = 3;  
X509_VALIDATE_CERTIFICATE_EXPIRED = 4;  
X509_VALIDATE_CERTIFICATE_UNKNOWN = 5;  
X509_VALIDATE_UNKNOWN_CA = 6;  


X509 certificate version X509_CERT_V*
X509_CERT_V1 = 0;  
X509_CERT_V2 = 1;  
X509_CERT_V3 = 2;  


X509 certificate extension X509_EXT_*
X509_EXT_BASIC_CONSTRAINTS = (1 shl 0);  
X509_EXT_PATH_LEN_CONSTRAINT = (1 shl 1);  
X509_EXT_KEY_USAGE = (1 shl 2);  
X509_EXT_SUBJECT_ALT_NAME = (1 shl 3);  
X509_EXT_ISSUER_ALT_NAME = (1 shl 4);  
X509_EXT_EXT_KEY_USAGE = (1 shl 5);  


X509 certificate key usage X509_KEY_USAGE_*
Note: RFC5280 Section 4.2.1.3. - Key Usage
X509_KEY_USAGE_DIGITAL_SIGNATURE = (1 shl 0); digitalSignature - The digitalSignature bit is asserted when the subject public key is used for verifying digital signatures, other than signatures on certificates.
X509_KEY_USAGE_NON_REPUDIATION = (1 shl 1); nonRepudiation - The nonRepudiation bit is asserted when the subject public key is used to verify digital signatures, other than signatures on certificates.
X509_KEY_USAGE_KEY_ENCIPHERMENT = (1 shl 2); keyEncipherment - The keyEncipherment bit is asserted when the subject public key is used for enciphering private or secret keys, i.e., for key transport
X509_KEY_USAGE_DATA_ENCIPHERMENT = (1 shl 3); 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.
X509_KEY_USAGE_KEY_AGREEMENT = (1 shl 4); keyAgreement - The keyAgreement bit is asserted when the subject public key is used for key agreement
X509_KEY_USAGE_KEY_CERT_SIGN = (1 shl 5); keyCertSign - The keyCertSign bit is asserted when the subject public key is used for verifying signatures on public key certificates
X509_KEY_USAGE_CRL_SIGN = (1 shl 6); cRLSign - The cRLSign bit is asserted when the subject public key is used for verifying signatures on certificate revocation lists
X509_KEY_USAGE_ENCIPHER_ONLY = (1 shl 7); 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.
X509_KEY_USAGE_DECIPHER_ONLY = (1 shl 8); 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.


X509 certificate extended key usage X509_EXT_KEY_USAGE_*
X509_EXT_KEY_USAGE_ANY = (1 shl 0);  
X509_EXT_KEY_USAGE_SERVER_AUTH = (1 shl 1);  
X509_EXT_KEY_USAGE_CLIENT_AUTH = (1 shl 2);  
X509_EXT_KEY_USAGE_OCSP = (1 shl 3);  


X509 certificate file types NAME_*
X509_FILETYPE_PEM = 1;  
X509_FILETYPE_ASN1 = 2;  


Type definitions


X509 serial number

PX509SerialNumber = ^TX509SerialNumber;

TX509SerialNumber = record

Value:array[0..X509_MAX_SERIAL_NUM_LEN - 1] of Byte;  
Length:Integer;  
 
function ToString:String;  

X509 name attribute

PX509NameAttribute = ^TX509NameAttribute;

TX509NameAttribute = record

Value:String;  
_Type:LongWord;  
 
function ToString:String;  

X509 name attributes

PX509NameAttributes = ^TX509NameAttributes;

TX509NameAttributes = array[0..X509_MAX_NAME_ATTRIBUTES - 1] of TX509NameAttribute;

   

X509 algorithm identifier

PX509AlgorithmIdentifier = ^TX509AlgorithmIdentifier;

TX509AlgorithmIdentifier = record

OID:TASN1OID;  
 
function ToString:String;  

X509 public key

PX509PublicKey = ^TX509PublicKey;

TX509PublicKey = record

Algorithm:TX509AlgorithmIdentifier;  
Key:PByte;  
Length:Integer;  
 
procedure Release;  
 
function ToString:String;  

X509 private key

PX509PrivateKey = ^TX509PrivateKey;

TX509PrivateKey = record

Note: RFC3447 - Appendix A.1.2 - RSA private key syntax
 
Algorithm:TX509AlgorithmIdentifier;  
Key:PByte;  
Length:Integer;  
 
procedure Release;  
 
function ToString:String;  

X509 signature

PX509Signature = ^TX509Signature;

TX509Signature = record

Algorithm:TX509AlgorithmIdentifier;  
Value:PByte;  
Length:Integer;  
 
procedure Release;  

X509 RSA public key

PX509RSAPublicKey = ^TX509RSAPublicKey;

TX509RSAPublicKey = record

Modulus:PByte; M
PublicExponent:PByte; E
 
ModulusLen:Integer;  
PublicExponentLen:Integer;  
 
function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;  
procedure Release;  

X509 RSA private key

PX509RSAPrivateKey = ^TX509RSAPrivateKey;

TX509RSAPrivateKey = record

Version:Integer;  
Modulus:PByte; M
PublicExponent:PByte; E
PrivateExponent:PByte; D
Prime1:PByte; P
Prime2:PByte; Q
Exponent1:PByte; D mod (P - 1)
Exponent2:PByte; D mod (Q - 1)
Coefficient:PByte; (Inverse of Q) mod P
 
ModulusLen:Integer;  
PublicExponentLen:Integer;  
PrivateExponentLen:Integer;  
Prime1Len:Integer;  
Prime2Len:Integer;  
Exponent1Len:Integer;  
Exponent2Len:Integer;  
CoefficientLen:Integer;  
 
function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;  
procedure Release;  

X509 ECDSA public key

PX509ECDSAPublicKey = ^TX509ECDSAPublicKey;

TX509ECDSAPublicKey = record

function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;  
procedure Release;  

X509 ECDSA private key

PX509ECDSAPrivateKey = ^TX509ECDSAPrivateKey;

TX509ECDSAPrivateKey = record

function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean;  
procedure Release;  


Class definitions


X509 name

TX509Name = class(TObject)

private
function StringCompare(const AValue1,AValue2:String):Integer;  
public
NameAttributes:TX509NameAttributes;  
NameAttributeCount:LongWord;  
 
Email:String; emailAddress
From subjectAltName extension
AltEmail:String; rfc822Name
DNS:String; dNSName
URI:String; uniformResourceIdentifier
IP:PByte; iPAddress
IPLen:Longword; IPv4 = 4,IPv6 = 16
RegisteredID:TASN1OID; registeredID
 
destructor Destroy; override;  
 
function GetCN:String;  
function GetDN:String;  
 
function Compare(AName:TX509Name):Integer;  

X509 certificate

TX509Certificate = class;

private
 
public
 

X509 certificate list

TX509CertificateList = class(TObject)

protected
FList:TList;  
FLock: TCriticalSectionHandle;  
 
procedure Clear;  
 
function AcquireLock:Boolean;  
function ReleaseLock:Boolean;  
public
constructor Create;  
destructor Destroy; override;  
 
function First:TX509Certificate; virtual;  
function Last:TX509Certificate; virtual;  
 
function Prev(ACertificate:TX509Certificate):TX509Certificate; virtual;  
function Next(ACertificate:TX509Certificate):TX509Certificate; virtual;  
 
function Add(ACertificate:TX509Certificate):Boolean; virtual;  
function Remove(ACertificate:TX509Certificate):Boolean; virtual;  
 
function FindByIssuer(AName:TX509Name):TX509Certificate; virtual;  
function FindBySubject(AName:TX509Name):TX509Certificate; virtual;  
 
function ImportDER(ABuffer:Pointer; ASize:Integer):TX509Certificate; virtual;  
function ImportPEM(ABuffer:Pointer; var ASize:Integer):TX509Certificate; virtual;  
 
function ExportDER(ABuffer:Pointer; var ASize:Integer; ACertificate:TX509Certificate):Boolean; virtual;  
function ExportPEM(ABuffer:Pointer; var ASize:Integer; AStart:TX509Certificate):Boolean; virtual;  

X509 certificate chain

TX509CertificateChain = class(TObject)

protected
FRoot:TX509Certificate;  
FLock: TCriticalSectionHandle;  
 
procedure Clear; virtual;  
 
function AcquireLock:Boolean;  
function ReleaseLock:Boolean;  
public
property Root:TX509Certificate read FRoot;  
 
constructor Create(ARoot:TX509Certificate); virtual;  
destructor Destroy; override;  
 
function Last:TX509Certificate; virtual;  
 
function Prev(ACertificate:TX509Certificate):TX509Certificate; virtual;  
function Next(ACertificate:TX509Certificate):TX509Certificate; virtual;  
 
function InsertAfter(AParent,ACertificate:TX509Certificate):Boolean; virtual;  
function InsertBefore(AChild,ACertificate:TX509Certificate):Boolean; virtual;  
function Remove(ACertificate:TX509Certificate):Boolean; virtual;  
 
function FindByIssuer(AName:TX509Name):TX509Certificate; virtual;  
function FindBySubject(AName:TX509Name):TX509Certificate; virtual;  
 
function FindBySubjectCN(const AName:String):TX509Certificate; virtual;  
function FindBySubjectDN(const AName:String):TX509Certificate; virtual;  
 
function ImportDER(ABuffer:Pointer; ASize:Integer; AParent:TX509Certificate):TX509Certificate; virtual;  
function ImportPEM(ABuffer:Pointer; var ASize:Integer; AParent:TX509Certificate):TX509Certificate; virtual;  
 
function ExportDER(ABuffer:Pointer; var ASize:Integer; ACertificate:TX509Certificate):Boolean; virtual;  
function ExportPEM(ABuffer:Pointer; var ASize:Integer; AStart:TX509Certificate):Boolean; virtual;  
 
function GetPathLength(ACertificate:TX509Certificate):LongWord; virtual;  
 
function ValidateChain(ATrust:TX509CertificateList):Integer; virtual;  

X509 certificate

TX509Certificate = class(TObject)

protected
FList:TX509CertificateList;  
FChain:TX509CertificateChain;  
 
FParent:TX509Certificate;  
FChild:TX509Certificate;  
 
FData:PByte; Copy of certificate data from import
FSize:LongWord; Total size of certificate data
 
FTBSData:PByte; Pointer to start of TBS (To Be Signed) data
FTBSSize:LongWord; Length of TBS (To Be Signed) data
 
function ImportTime(ABuffer:PByte; ASize:Integer; ATag:LongWord ADateTime:TDateTime):Boolean;  
 
function ImportName(ABuffer:PByte; ASize:Integer; AName:TX509Name; var ANext:PByte):Boolean;  
function ImportExtensionAltName(ABuffer:PByte; ASize:Integer; AName:TX509Name):Boolean;  
 
function ImportAlgorithmIdentifier(ABuffer:PByte; ASize:Integer; var AIdentifier:TX509AlgorithmIdentifier; var ANext:PByte):Boolean;  
 
function ImportValidity(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;  
 
function ImportPublicKey(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;  
 
function ImportExtension(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;  
function ImportExtensionData(ABuffer:PByte; ASize:Integer; const AOID:TASN1OID):Boolean;  
function ImportExtensionKeyUsage(ABuffer:PByte; ASize:Integer):Boolean;  
function ImportExtensionSubjectAltName(ABuffer:PByte; ASize:Integer):Boolean;  
function ImportExtensionIssuerAltName(ABuffer:PByte; ASize:Integer):Boolean;  
function ImportExtensionBasicContraints(ABuffer:PByte; ASize:Integer):Boolean;  
function ImportExtensionExtKeyUsage(ABuffer:PByte; ASize:Integer):Boolean;  
 
function ImportExtensions(ABuffer:PByte; ASize:Integer):Boolean;  
 
function ImportTBSCertificate(ABuffer:PByte; ASize:Integer; var ANext:PByte):Boolean;  
 
function VerifyRSASignature(AIssuer:TX509Certificate):Boolean;  
 
function VerifyMD5Digest(ABuffer:PByte; ASize:Integer):Boolean;  
function VerifySHA1Digest(ABuffer:PByte; ASize:Integer):Boolean;  
function VerifySHA256Digest(ABuffer:PByte; ASize:Integer):Boolean;  
function VerifySHA384Digest(ABuffer:PByte; ASize:Integer):Boolean;  
function VerifySHA512Digest(ABuffer:PByte; ASize:Integer):Boolean;  
public
Properties
Version:LongWord;  
SerialNumber:TX509SerialNumber;  
SignatureAlgorithm:TX509AlgorithmIdentifier;  
 
Issuer:TX509Name;  
Subject:TX509Name;  
SubjectDN:String;  
 
NotBefore:TDateTime;  
NotAfter:TDateTime;  
 
PublicKey:TX509PublicKey;  
 
Signature:TX509Signature;  
Extensions
ExtensionsPresent:LongWord;  
 
CA:Boolean;  
PathLenConstraint:LongWord;  
 
KeyUsage:LongWord;  
ExtendedKeyUsage:LongWord;  
 
property List:TX509CertificateList read FList;  
property Chain:TX509CertificateChain read FChain;  
property Parent:TX509Certificate read FParent;  
property Child:TX509Certificate read FChild;  
 
constructor Create(AChain:TX509CertificateChain; AParent:TX509Certificate); virtual;  
destructor Destroy; override;  
 
function ImportDER(ABuffer:Pointer; ASize:Integer):Boolean; virtual;  
function ImportPEM(ABuffer:Pointer; var ASize:Integer):Boolean; virtual;  
 
function ExportDER(ABuffer:Pointer; var ASize:Integer):Boolean; virtual;  
function ExportPEM(ABuffer:Pointer; var ASize:Integer):Boolean; virtual;  
 
function IsValidIssuer:Boolean; virtual;  
function IsSelfSigned:Boolean; virtual;  
 
function VerifySignature(AIssuer:TX509Certificate):Boolean; virtual;  
function ValidateCertificate(AIssuer:TX509Certificate):Integer; virtual;  


Public variables

None defined

Function declarations


X509 helper functions 

function X509NameAttributeTypeToString(AType:LongWord):String;
Description: To be documented
Note None documented


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