3 Certificate records

This chapter briefly describes erlang records derived from asn1 specifications used to handle X509 certificates. The intent is to describe the data types and not to specify the meaning of each component for this we refer you to RFC 3280.

Use the following include directive to get access to the records and constant macros (OIDs) described in the following sections.

 -include_lib("public_key/include/public_key.hrl"). 

The used specification is available in OTP-PKIX.asn1, which is an amelioration of the PKIX1Explicit88.asn1, PKIX1Implicit88.asn1 and PKIX1Algorithms88.asn1 modules. You find all these modules in the asn1 subdirectory of the application public_key.

3.1  Common Data Types

Common non standard erlang data types used to described the record fields in the below sections are defined in public key reference manual or follows here.

time() = uct_time() | general_time()

uct_time() = {utcTime, "YYMMDDHHMMSSZ"}

general_time() = {generalTime, "YYYYMMDDHHMMSSZ"}

general_name() = {rfc822Name, string()} | {dNSName, string()} | {x400Address, string()} | {directoryName, {rdnSequence, [#AttributeTypeAndValue'{}]}} | | {eidPartyName, special_string()} | {eidPartyName, special_string(), special_string()} | {uniformResourceIdentifier, string()} | {ipAddress, string()} | {registeredId, oid()} | {otherName, term()}

special_string() = {teletexString, string()} | {printableString, string()} | {universalString, string()} | {utf8String, string()} | {bmpString, string()}

dist_reason() = unused | keyCompromise | cACompromise | affiliationChanged | superseded | cessationOfOperation | certificateHold | privilegeWithdrawn | aACompromise

3.2  PKIX Certificates

#'Certificate'{
		tbsCertificate,        % #'TBSCertificate'{}
		signatureAlgorithm,    % #'AlgorithmIdentifier'{} 
		signature              % {0, binary()} - asn1 compact bitstring
	       }.

#'TBSCertificate'{
	  version,              % v1 | v2 | v3 
	  serialNumber,         % integer() 
	  signature,            % #'AlgorithmIdentifier'{} 
	  issuer,               % {rdnSequence, [#AttributeTypeAndValue'{}]} 
	  validity,             % #'Validity'{}
	  subject,              % {rdnSequence, [#AttributeTypeAndValue'{}]} 
	  subjectPublicKeyInfo, % #'SubjectPublicKeyInfo'{}
	  issuerUniqueID,       % binary() | asn1_novalue
	  subjectUniqueID,      % binary() | asn1_novalue
	  extensions            % [#'Extension'{}] 
	 }.
	  
#'AlgorithmIdentifier'{
	  algorithm,  % oid() 
	  parameters  % asn1_der_encoded()
	 }.
#'SignatureAlgorithm'{
	  algorithm,  % id_signature_algorithm()
	  parameters  % public_key_params()
	 }.

id_signature_algorithm() = ?oid_name_as_erlang_atom for available oid names see table below. Ex: ?'id-dsa-with-sha1'

OID name
id-dsa-with-sha1
md2WithRSAEncryption
md5WithRSAEncryption
sha1WithRSAEncryption
ecdsa-with-SHA1
Table 3.1:   Signature algorithm oids
#'AttributeTypeAndValue'{
	  type,   % id_attributes()
	  value   % term() 
	 }.

id_attributes()

OID name Value type
id-at-name special_string()
id-at-surname special_string()
id-at-givenName special_string()
id-at-initials special_string()
id-at-generationQualifier special_string()
id-at-commonName special_string()
id-at-localityName special_string()
id-at-stateOrProvinceName special_string()
id-at-organizationName special_string()
id-at-title special_string()
id-at-dnQualifier {printableString, string()}
id-at-countryName {printableString, string()}
id-at-serialNumber {printableString, string()}
id-at-pseudonym special_string()
Table 3.2:   Attribute oids
#'Validity'{ 
	  notBefore, % time()
	  notAfter   % time()
	 }.
	 
#'SubjectPublicKeyInfo'{
	  algorithm,       % #AlgorithmIdentifier{} 
	  subjectPublicKey % binary() 
	 }.

#'SubjectPublicKeyInfoAlgorithm'{
	  algorithm,  % id_public_key_algorithm()
	  parameters  % public_key_params()
	 }.

id_public_key_algorithm()

OID name
rsaEncryption
id-dsa
dhpublicnumber
ecdsa-with-SHA1
id-keyExchangeAlgorithm
Table 3.3:   Public key algorithm oids
#'Extension'{
	  extnID,    % id_extensions() | oid() 
	  critical,  % boolean()
	  extnValue  % asn1_der_encoded() 
	 }.

id_extensions() Standard Certificate Extensions, Private Internet Extensions, CRL Extensions and CRL Entry Extensions.

3.3  Standard certificate extensions

OID name Value type
id-ce-authorityKeyIdentifier #'AuthorityKeyIdentifier'{}
id-ce-subjectKeyIdentifier oid()
id-ce-keyUsage [key_usage()]
id-ce-privateKeyUsagePeriod #'PrivateKeyUsagePeriod'{}
id-ce-certificatePolicies #'PolicyInformation'{}
id-ce-policyMappings #'PolicyMappings_SEQOF'{}
id-ce-subjectAltName general_name()
id-ce-issuerAltName general_name()
id-ce-subjectDirectoryAttributes [#'Attribute'{}]
id-ce-basicConstraints #'BasicConstraints'{}
id-ce-nameConstraints #'NameConstraints'{}
id-ce-policyConstraints #'PolicyConstraints'{}
id-ce-extKeyUsage [id_key_purpose()]
id-ce-cRLDistributionPoints #'DistributionPoint'{}
id-ce-inhibitAnyPolicy integer()
id-ce-freshestCRL [#'DistributionPoint'{}]
Table 3.4:   Standard Certificate Extensions

key_usage() = digitalSignature | nonRepudiation | keyEncipherment| dataEncipherment | keyAgreement | keyCertSign | cRLSign | encipherOnly | decipherOnly

id_key_purpose()

OID name
id-kp-serverAuth
id-kp-clientAuth
id-kp-codeSigning
id-kp-emailProtection
id-kp-timeStamping
id-kp-OCSPSigning
Table 3.5:   Key purpose oids
#'AuthorityKeyIdentifier'{
	  keyIdentifier,	    % oid()
	  authorityCertIssuer,      % general_name()
	  authorityCertSerialNumber % integer() 
	 }.

#'PrivateKeyUsagePeriod'{
	  notBefore,   % general_time()
	  notAfter     % general_time()
	 }.

#'PolicyInformation'{
	  policyIdentifier,  % oid()
	  policyQualifiers   % [#PolicyQualifierInfo{}]
	 }.

#'PolicyQualifierInfo'{
	  policyQualifierId,   % oid()
	  qualifier            % string() | #'UserNotice'{}
	 }.

#'UserNotice'{
         noticeRef,   % #'NoticeReference'{}
	 explicitText % string()
	 }.

#'NoticeReference'{
         organization,    % string()
	 noticeNumbers    % [integer()]
	 }.

#'PolicyMappings_SEQOF'{
	  issuerDomainPolicy,  % oid()
	  subjectDomainPolicy  % oid()
	 }.

#'Attribute'{
          type,  % oid()
	  values % [asn1_der_encoded()]
	  }).

#'BasicConstraints'{
	  cA,		    % boolean()
	  pathLenConstraint % integer()
	 }).

#'NameConstraints'{
	  permittedSubtrees, % [#'GeneralSubtree'{}]
	  excludedSubtrees   % [#'GeneralSubtree'{}]
	 }).

#'GeneralSubtree'{
	  base,    % general_name()
	  minimum, % integer()
	  maximum  % integer()
	 }).

#'PolicyConstraints'{
	  requireExplicitPolicy, % integer()
	  inhibitPolicyMapping   % integer()
	 }).

#'DistributionPoint'{
	  distributionPoint, % general_name() | [#AttributeTypeAndValue{}]
	  reasons,           % [dist_reason()]
	  cRLIssuer          % general_name()
	 }).

3.4  Private Internet Extensions

OID name Value type
id-pe-authorityInfoAccess [#'AccessDescription'{}]
id-pe-subjectInfoAccess [#'AccessDescription'{}]
Table 3.6:   Private Internet Extensions
#'AccessDescription'{
           accessMethod,    % oid()
	   accessLocation   % general_name()
	 }).

3.5  CRL and CRL Extensions Profile

#'CertificateList'{
          tbsCertList,        % #'TBSCertList{}
          signatureAlgorithm, % #'AlgorithmIdentifier'{} 
          signature           % {0, binary()} - asn1 compact bitstring
	  }).

#'TBSCertList'{
      version,             % v2 (if defined)
      signature,           % #AlgorithmIdentifier{}
      issuer,              % {rdnSequence, [#AttributeTypeAndValue'{}]} 
      thisUpdate,          % time()
      nextUpdate,          % time() 
      revokedCertificates, % [#'TBSCertList_revokedCertificates_SEQOF'{}]
      crlExtensions        % [#'Extension'{}]
      }).

#'TBSCertList_revokedCertificates_SEQOF'{
         userCertificate,      % integer()
 	 revocationDate,       % timer()
	 crlEntryExtensions    % [#'Extension'{}]
	 }).
 

CRL Extensions

OID name Value type
id-ce-authorityKeyIdentifier #'AuthorityKeyIdentifier{}
id-ce-issuerAltName {rdnSequence, [#AttributeTypeAndValue'{}]}
id-ce-cRLNumber integer()
id-ce-deltaCRLIndicator integer()
id-ce-issuingDistributionPoint #'IssuingDistributionPoint'{}
id-ce-freshestCRL [#'Distributionpoint'{}]
Table 3.7:   CRL Extensions
#'IssuingDistributionPoint'{
          distributionPoint,         % general_name() | [#AttributeTypeAndValue'{}]
	  onlyContainsUserCerts,     % boolean()
	  onlyContainsCACerts,       % boolean()
	  onlySomeReasons,           % [dist_reason()]
	  indirectCRL,               % boolean()
	  onlyContainsAttributeCerts % boolean()
	  }).
      

CRL Entry Extensions

OID name Value type
id-ce-cRLReason crl_reason()
id-ce-holdInstructionCode oid()
id-ce-invalidityDate general_time()
id-ce-certificateIssuer general_name()
Table 3.8:   CRL Entry Extensions

crl_reason() = unspecified | keyCompromise | cACompromise | affiliationChanged | superseded | cessationOfOperation | certificateHold | removeFromCRL | privilegeWithdrawn | aACompromise