This chapter briefly describes erlang records derived from ASN1 specifications used to handle X509 certificates and CertificationRequest. The intent is to describe the data types and not to specify the meaning of each component for this we refer you to RFC 5280 and PKCS-10.

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 ASN1 specifications are available asn1 subdirectory of the application public_key.

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dist_reason() = unused | keyCompromise | cACompromise | affiliationChanged | superseded | cessationOfOperation | certificateHold | privilegeWithdrawn | aACompromise

## 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 % der_encoded() }.` `#'OTPCertificate'{ tbsCertificate, % #'OTPTBSCertificate'{} signatureAlgorithm, % #'SignatureAlgorithm' signature % {0, binary()} - ASN1 compact bitstring }. #'OTPTBSCertificate'{ version, % v1 | v2 | v3 serialNumber, % integer() signature, % #'SignatureAlgorithm' issuer, % {rdnSequence, [#AttributeTypeAndValue'{}]} validity, % #'Validity'{} subject, % {rdnSequence, [#AttributeTypeAndValue'{}]} subjectPublicKeyInfo, % #'OTPSubjectPublicKeyInfo'{} issuerUniqueID, % binary() | asn1_novalue subjectUniqueID, % binary() | asn1_novalue extensions % [#'Extension'{}] }. #'SignatureAlgorithm'{ algorithm, % id_signature_algorithm() parameters % asn1_novalue | #'Dss-Parms'{} }.`

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
id-dsaWithSHA1 (ISO alt oid to above)
md2WithRSAEncryption
md5WithRSAEncryption
sha1WithRSAEncryption
sha-1WithRSAEncryption (ISO alt oid to above)
sha224WithRSAEncryption
sha256WithRSAEncryption
sha512WithRSAEncryption
ecdsa-with-SHA1
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()
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
id-keyExchangeAlgorithm
id-ecPublicKey
Public key algorithm oids

`#'Extension'{ extnID, % id_extensions() | oid() critical, % boolean() extnValue % der_encoded() }.`

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

## 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'{}]
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
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 % [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, % {fullName, [general_name()]} | {nameRelativeToCRLIssuer, [#AttributeTypeAndValue{}]} reasons, % [dist_reason()] cRLIssuer % [general_name()] }).`

## Private Internet Extensions

OID name Value type
id-pe-authorityInfoAccess [#'AccessDescription'{}]
id-pe-subjectInfoAccess [#'AccessDescription'{}]
Private Internet Extensions

`#'AccessDescription'{ accessMethod, % oid() accessLocation % general_name() }).`

## 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'{}]
CRL Extensions

`#'IssuingDistributionPoint'{ distributionPoint, % {fullName, [general_name()]} | {nameRelativeToCRLIssuer, [#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()
CRL Entry Extensions

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

### PKCS#10 Certification Request

`#'CertificationRequest'{ certificationRequestInfo #'CertificationRequestInfo'{}, signatureAlgorithm #'CertificationRequest_signatureAlgorithm'{}}. signature {0, binary()} - ASN1 compact bitstring } #'CertificationRequestInfo'{ version atom(), subject {rdnSequence, [#AttributeTypeAndValue'{}]} , subjectPKInfo #'CertificationRequestInfo_subjectPKInfo'{}, attributes [#'AttributePKCS-10' {}] } #'CertificationRequestInfo_subjectPKInfo'{ algorithm #'CertificationRequestInfo_subjectPKInfo_algorithm'{} subjectPublicKey {0, binary()} - ASN1 compact bitstring } #'CertificationRequestInfo_subjectPKInfo_algorithm'{ algorithm = oid(), parameters = der_encoded() } #'CertificationRequest_signatureAlgorithm'{ algorithm = oid(), parameters = der_encoded() } #'AttributePKCS-10'{ type = oid(), values = [der_encoded()] }`