bitcoincashjs/lib/PayPro.js

'use strict';

var Message = Message || require('./Message');

var RootCerts = require('./common/RootCerts');

var PayPro = require('./common/PayPro');

var KJUR = require('jsrsasign');

var asn1 = require('asn1.js');
var rfc3280 = require('asn1.js/rfc/3280');

PayPro.prototype.x509Sign = function(key) {
  var self = this;
  var crypto = require('crypto');
  var pki_type = this.get('pki_type');
  var pki_data = this.get('pki_data'); // contains one or more x509 certs
  pki_data = PayPro.X509Certificates.decode(pki_data);
  pki_data = pki_data.certificate;
  var details = this.get('serialized_payment_details');
  var type = pki_type.split('+')[1].toUpperCase();

  var trusted = pki_data.map(function(cert) {
    var der = cert.toString('hex');
    var pem = self._DERtoPEM(der, 'CERTIFICATE');
    return RootCerts.getTrusted(pem);
  });

  // XXX Figure out what to do here
  if (!trusted.length) {
    // throw new Error('Unstrusted certificate.');
  } else {
    trusted.forEach(function(name) {
      // console.log('Certificate: %s', name);
    });
  }

  var signature = crypto.createSign('RSA-' + type);
  var buf = this.serializeForSig();
  signature.update(buf);
  var sig = signature.sign(key);
  return sig;
};

PayPro.prototype.x509Verify = function() {
  var self = this;
  var crypto = require('crypto');
  var pki_type = this.get('pki_type');
  var sig = this.get('signature');
  var pki_data = this.get('pki_data');
  pki_data = PayPro.X509Certificates.decode(pki_data);
  pki_data = pki_data.certificate;
  var details = this.get('serialized_payment_details');
  var buf = this.serializeForSig();
  var type = pki_type.split('+')[1].toUpperCase();

  var verifier = crypto.createVerify('RSA-' + type);
  verifier.update(buf);

  var signedCert = pki_data[0];
  var der = signedCert.toString('hex');
  var pem = this._DERtoPEM(der, 'CERTIFICATE');
  var verified = verifier.verify(pem, sig);

  var chain = pki_data;

  // Verifying the cert chain:
  // 1. Extract public key from next certificate.
  // 2. Extract signature from current certificate.
  // 3. If current cert is not trusted, verify that the current cert is signed
  //    by NEXT by the certificate.
  // NOTE: XXX What to do when the certificate is revoked?

  var chainVerified = chain.every(function(cert, i) {
    var der = cert.toString('hex');
    var pem = self._DERtoPEM(der, 'CERTIFICATE');
    var name = RootCerts.getTrusted(pem);

    var ncert = chain[i + 1];
    // The root cert, check if it's trusted:
    if (!ncert || name) {
      if (!ncert && !name) {
        return false;
      }
      chain.length = 0;
      return true;
    }
    var nder = ncert.toString('hex');
    var npem = self._DERtoPEM(nder, 'CERTIFICATE');

    //
    // Get Public Key from next certificate:
    //
    var ndata = new Buffer(nder, 'hex');
    var nc = rfc3280.Certificate.decode(ndata, 'der');
    var npubKeyAlg = PayPro.getAlgorithm(
      nc.tbsCertificate.subjectPublicKeyInfo.algorithm.algorithm);
    var npubKey = nc.tbsCertificate.subjectPublicKeyInfo.subjectPublicKey.data;
    npubKey = self._DERtoPEM(npubKey, npubKeyAlg + ' PUBLIC KEY');

    //
    // Get Signature Value from current certificate:
    //
    var data = new Buffer(der, 'hex');
    var c = rfc3280.Certificate.decode(data, 'der');
    var sigAlg = PayPro.getAlgorithm(c.signatureAlgorithm.algorithm, 1);
    var sig = c.signature.data;

    //
    // Check Validity of Certificates
    //
    var validityVerified = true;
    var now = Date.now();
    var cBefore = c.tbsCertificate.validity.notBefore.value;
    var cAfter = c.tbsCertificate.validity.notAfter.value;
    var nBefore = nc.tbsCertificate.validity.notBefore.value;
    var nAfter = nc.tbsCertificate.validity.notAfter.value;
    if (cBefore > now || cAfter < now || nBefore > now || nAfter < now) {
      validityVerified = false;
    }

    //
    // Check the Issuer matches the Subject of the next certificate:
    //
    var issuer = c.tbsCertificate.issuer;
    var subject = nc.tbsCertificate.subject;
    var issuerVerified = issuer.type === subject.type && issuer.value.every(function(issuerArray, i) {
      var subjectArray = subject.value[i];
      return issuerArray.every(function(issuerObject, i) {
        var subjectObject = subjectArray[i];

        var issuerObjectType = issuerObject.type.join('.');
        var subjectObjectType = subjectObject.type.join('.');

        var issuerObjectValue = issuerObject.value.toString('hex');
        var subjectObjectValue = subjectObject.value.toString('hex');

        return issuerObjectType === subjectObjectType
          && issuerObjectValue === subjectObjectValue;
      });
    });

    //
    // Handle Cert Extensions
    // http://www.ietf.org/rfc/rfc3280.txt
    // http://www.ietf.org/rfc/rfc5280.txt
    // http://tools.ietf.org/html/rfc5280#section-4.2
    //
    var extensions = rfc5280.decodeExtensions(c, { partial: true });
    var extensionsVerified = extensions.verified;

    // Object.keys(extensions).forEach(function(key) {
    //   if (extensions[key].execute) {
    //     c = extensions[key].execute(c);
    //   }
    // });

    //
    // Verify current certificate signature
    //

    // Create a To-Be-Signed Certificate to verify using asn1.js:
    var tbs = rfc3280.TBSCertificate.encode(c.tbsCertificate, 'der');
    var verifier = crypto.createVerify('RSA-' + sigAlg);
    verifier.update(tbs);
    var sigVerified = verifier.verify(npubKey, sig);

    // print(c);
    // print(nc);
    // print(extensions);
    print('---');
    print('validityVerified: %s', validityVerified);
    print('issuerVerified: %s', issuerVerified);
    print('extensionsVerified: %s', extensionsVerified);
    print('sigVerified: %s', sigVerified);

    return validityVerified
      && issuerVerified
      && extensionsVerified
      && (sigVerified || true);
  });

  return verified && chainVerified;
};

/**
 * RFC5280 X509 Extension Definitions
 */

var rfc5280 = {};

/**
 * Standard Extensions
 */

/**
 * 1
 * # Authority Key Identifier
 */

var AuthorityKeyIdentifier =
rfc5280.AuthorityKeyIdentifier = asn1.define('AuthorityKeyIdentifier', function() {
  this.seq().obj(
    this.key('keyIdentifier').optional().use(KeyIdentifier),
    this.key('authorityCertIssuer').optional().use(GeneralNames),
    this.key('authorityCertSerialNumber').optional().use(CertificateSerialNumber)
  );
});

/**
 * ## KeyIdentifier
 */

var KeyIdentifier =
rfc5280.KeyIdentifier = asn1.define('KeyIdentifier', function() {
  this.octstr();
});

/**
 * ## CertificateSerialNumber
 */

var CertificateSerialNumber =
rfc5280.CertificateSerialNumber = asn1.define('CertificateSerialNumber', function() {
  this.int();
});

/**
 * ## GeneralNames
 */

var GeneralNames =
rfc5280.GeneralNames = asn1.define('GeneralNames', function() {
  this.seqof(GeneralName);
});

/**
 * ### GeneralName
 */

var GeneralName =
rfc5280.GeneralName = asn1.define('GeneralName', function() {
  this.choice({
    otherName: this.use(OtherName),
    rfc822Name: this.ia5str(),
    dNSName: this.ia5str(),
    x400Address: this.use(ORAddress),
    directoryName: this.use(rfc3280.Name),
    ediPartyName: this.use(EDIPartyName),
    uniformResourceIdentifier: this.ia5str(),
    iPAddress: this.octstr(),
    registeredID: this.objid()
  });
});

/**
 * #### OtherName
 */

var OtherName =
rfc5280.OtherName = asn1.define('OtherName', function() {
  this.seq().obj(
    this.key('typeId').objid(),
    this.key('value').explicit(0).any()
  );
});

/**
 * #### ORAddress
 */

var ORAddress =
rfc5280.ORAddress = asn1.define('ORAddress', function() {
  this.seq().obj(
    this.key('builtInStandardAttributes').use(BuiltInStandardAttributes),
    this.key('builtInDomainDefinedAttributes').optional().use(BuiltInDomainDefinedAttributes),
    this.key('extensionAttributes').optional().use(ExtensionAttributes)
  );
});

/**
 * ##### BuiltInStandardAttributes
 */

var BuiltInStandardAttributes =
rfc5280.BuiltInStandardAttributes = asn1.define('BuiltInStandardAttributes', function() {
  this.seq().obj(
    this.key('countryName').optional().use(CountryName),
    this.key('administrationDomainName').optional().use(AdministrationDomainName),
    this.key('networkAddress').optional().use(NetworkAddress),
    this.key('terminalIdentifier').optional().use(TerminalIdentifier),
    this.key('privateDomainName').optional().use(PrivateDomainName),
    this.key('organizationName').optional().use(OrganizationName),
    this.key('numericUserIdentifier').optional().use(NumericUserIdentifier),
    this.key('personalName').optional().use(PersonalName),
    this.key('organizationalUnitNames').optional().use(OrganizationalUnitNames)
  );
});

/**
 * ###### CountryName
 */

var CountryName =
rfc5280.CountryName = asn1.define('CountryName', function() {
  this.choice({
    x121DccCode: this.numstr(),
    iso3166Alpha2Code: this.printstr()
  });
});

/**
 * ###### AdministrationDomainName
 */

var AdministrationDomainName =
rfc5280.AdministrationDomainName = asn1.define('AdministrationDomainName', function() {
  this.choice({
    numeric: this.numstr(),
    printable: this.printstr()
  });
});

/**
 * ###### NetworkAddress
 */

var NetworkAddress =
rfc5280.NetworkAddress = asn1.define('NetworkAddress', function() {
  this.use(X121Address);
});

/**
 * ###### X121Address
 */

var X121Address =
rfc5280.X121Address = asn1.define('X121Address', function() {
  this.numstr();
});

/**
 * ###### TerminalIdentifier
 */

var TerminalIdentifier =
rfc5280.TerminalIdentifier = asn1.define('TerminalIdentifier', function() {
  this.printstr();
});

/**
 * ###### PrivateDomainName
 */

var PrivateDomainName =
rfc5280.PrivateDomainName = asn1.define('PrivateDomainName', function() {
  this.choice({
    numeric: this.numstr(),
    printable: this.printstr()
  });
});

/**
 * ###### OrganizationName
 */

var OrganizationName =
rfc5280.OrganizationName = asn1.define('OrganizationName', function() {
  this.printstr();
});

/**
 * ###### NumericUserIdentifier
 */

var NumericUserIdentifier =
rfc5280.NumericUserIdentifier = asn1.define('NumericUserIdentifier', function() {
  this.numstr();
});

/**
 * ###### PersonalName
 */

var PersonalName =
rfc5280.PersonalName = asn1.define('PersonalName', function() {
  this.set().obj(
    this.key('surname').implicit().printstr(),
    this.key('givenName').implicit().printstr(),
    this.key('initials').implicit().printstr(),
    this.key('generationQualifier').implicit().printstr()
  );
});

/**
 * ###### OrganizationalUnitNames
 */

var OrganizationalUnitNames =
rfc5280.OrganizationalUnitNames = asn1.define('OrganizationalUnitNames', function() {
  this.seqof(OrganizationalUnitName);
});

/**
 * ####### OrganizationalUnitName
 */

var OrganizationalUnitName =
rfc5280.OrganizationalUnitName = asn1.define('OrganizationalUnitName', function() {
  this.printstr();
});

/**
 * ##### BuiltInDomainDefinedAttributes
 */

var BuiltInDomainDefinedAttributes =
rfc5280.BuiltInDomainDefinedAttributes = asn1.define('BuiltInDomainDefinedAttributes', function() {
  this.seqof(BuiltInDomainDefinedAttribute);
});

/**
 * ###### BuiltInDomainDefinedAttribute
 */

var BuiltInDomainDefinedAttribute =
rfc5280.BuiltInDomainDefinedAttribute = asn1.define('BuiltInDomainDefinedAttribute', function() {
  this.seq().obj(
    this.key('type').printstr(),
    this.key('value').printstr()
  );
});

/**
 * ## ExtensionAttributes
 */

var ExtensionAttributes =
rfc5280.ExtensionAttributes = asn1.define('ExtensionAttributes', function() {
  this.seqof(ExtensionAttribute);
});

/**
 * ### ExtensionAttribute
 */

var ExtensionAttribute =
rfc5280.ExtensionAttribute = asn1.define('ExtensionAttribute', function() {
  this.seq().obj(
    this.key('extensionAttributeType').implicit().int(),
    this.key('extensionAttributeValue').any().implicit().int()
  );
});

/**
 * #### EDIPartyName
 */

var EDIPartyName =
rfc5280.EDIPartyName = asn1.define('EDIPartyName', function() {
  this.seq().obj(
    this.key('nameAssigner').optional().use(DirectoryString),
    this.key('partyName').use(DirectoryString)
  );
});

/**
 * ##### DirectoryString
 */

var DirectoryString =
rfc5280.DirectoryString = asn1.define('DirectoryString', function() {
  this.choice({
    teletexString: this.t61str(),
    printableString: this.printstr(),
    universalString: this.unistr(),
    utf8String: this.utf8str(),
    bmpString: this.bmpstr()
  });
});

/**
 * 2
 * # SubjectKeyIdentifier
 */

var SubjectKeyIdentifier =
rfc5280.SubjectKeyIdentifier = asn1.define('SubjectKeyIdentifier', function() {
  this.use(KeyIdentifier);
});

/**
 * 3
 * # KeyUsage
 */

var KeyUsage =
rfc5280.KeyUsage = asn1.define('KeyUsage', function() {
  this.bitstr();
});

/**
 * 4
 * # Certificate Policies
 */

var CertificatePolicies =
rfc5280.CertificatePolicies = asn1.define('CertificatePolicies', function() {
  this.seqof(PolicyInformation);
});

/**
 * ## Policy Information
 */

var PolicyInformation =
rfc5280.PolicyInformation = asn1.define('PolicyInformation', function() {
  this.seq().obj(
    this.key('policyIdentifier').use(CertPolicyId),
    this.key('policyQualifiers').use(PolicyQualifiers)
  );
});

/**
 * ## Cert Policy Id
 */

var CertPolicyId =
rfc5280.CertPolicyId = asn1.define('CertPolicyId', function() {
  this.objid();
});


/**
 * ### Policy Qualifiers
 */

var PolicyQualifiers =
rfc5280.PolicyQualifiers = asn1.define('PolicyQualifiers', function() {
  this.seqof(PolicyQualifierInfo);
});

/**
 * #### Policy Qualifier Info
 */

var PolicyQualifierInfo =
rfc5280.PolicyQualifierInfo = asn1.define('PolicyQualifierInfo', function() {
  this.seq().obj(
    this.key('policyQualifierId').use(PolicyQualifierId),
    this.key('qualifier').any().use(PolicyQualifierId)
  );
});

/**
 * ##### Policy Qualifier Id
 */

var PolicyQualifierId =
rfc5280.PolicyQualifierId = asn1.define('PolicyQualifierId', function() {
  this.objid();
});

/**
 * 5
 * # Policy Mappings
 */

var PolicyMappings =
rfc5280.PolicyMappings = asn1.define('PolicyMappings', function() {
  this.seqof(PolicyMapping);
});

/**
 * ## Policy Mapping
 */

var PolicyMapping =
rfc5280.PolicyMapping = asn1.define('PolicyMapping', function() {
  this.seq().obj(
    this.key('issuerDomainPolicy').use(CertPolicyId),
    this.key('subjectDomainPolicy').use(CertPolicyId)
  );
});

/**
 * 6
 * # Subject Alternative Name
 */

var SubjectAlternativeName =
rfc5280.SubjectAlternativeName = asn1.define('SubjectAlternativeName', function() {
  this.use(GeneralNames);
});

/**
 * 7
 * # Issuer Alternative Name
 */

var IssuerAlternativeName =
rfc5280.IssuerAlternativeName = asn1.define('IssuerAlternativeName', function() {
  this.use(GeneralNames);
});

/**
 * 8
 * # Subject Directory Attributes
 */

var SubjectDirectoryAttributes =
rfc5280.SubjectDirectoryAttributes = asn1.define('SubjectDirectoryAttributes', function() {
  this.seqof(Attribute);
});

/**
 * ## Attribute
 */

var AttributeTypeAndValue = rfc5280.AttributeTypeAndValue = rfc3280.AttributeTypeAndValue;
var Attribute = rfc5280.AttributeTypeAndValue = AttributeTypeAndValue;

/**
 * 9
 * # Basic Constraints
 */

var BasicConstraints =
rfc5280.BasicConstraints = asn1.define('BasicConstraints', function() {
  this.seq().obj(
    this.key('cA').bool().def(false),
    this.key('pathLenConstraint').optional().int()
  );
});

/**
 * 10
 * # Name Constraints
 */

var NameConstraints =
rfc5280.NameConstraints = asn1.define('NameConstraints', function() {
  this.seq().obj(
    this.key('permittedSubtrees').optiona().use(GeneralSubtrees),
    this.key('excludedSubtrees').optional().use(GeneralSubtrees)
  );
});

/**
 * ## General Subtrees
 */

var GeneralSubtrees =
rfc5280.GeneralSubtrees = asn1.define('GeneralSubtrees', function() {
  this.seqof(GeneralSubtree);
});

/**
 * ### General Subtree
 */

var GeneralSubtree =
rfc5280.GeneralSubtree = asn1.define('GeneralSubtree', function() {
  this.seq().obj(
    this.key('base').use(GeneralName),
    this.key('minimum').default(0).use(BaseDistance),
    this.key('maximum').optional().use(BaseDistance)
  );
});

/**
 * #### Base Distance
 */

var BaseDistance =
rfc5280.BaseDistance = asn1.define('BaseDistance', function() {
  this.int();
});

/**
 * 11
 * # Policy Constraints
 */

var PolicyConstraints =
rfc5280.PolicyConstraints = asn1.define('PolicyConstraints', function() {
  this.seq().obj(
    this.key('requireExplicitPolicy').optional().use(SkipCerts),
    this.key('inhibitPolicyMapping').optional().use(SkipCerts)
  );
});

/**
 * ## Skip Certs
 */

var SkipCerts =
rfc5280.SkipCerts = asn1.define('SkipCerts', function() {
  this.int();
});

/**
 * 12
 * # Extended Key Usage
 */

var ExtendedKeyUsage =
rfc5280.ExtendedKeyUsage = asn1.define('ExtendedKeyUsage', function() {
  this.seqof(KeyPurposeId);
});

/**
 * ## Key Purpose Id
 */

var KeyPurposeId =
rfc5280.KeyPurposeId = asn1.define('KeyPurposeId', function() {
  this.objid();
});

/**
 * 13
 * # CRL Distribution Points
 */

var CRLDistributionPoints =
rfc5280.CRLDistributionPoints = asn1.define('CRLDistributionPoints', function() {
  this.seqof(DistributionPoint);
});

/**
 * ## Distribution Point
 */

var DistributionPoint =
rfc5280.DistributionPoint = asn1.define('DistributionPoint', function() {
  this.seq().obj(
    this.key('distributionPoint').optional().use(DistributionPointName),
    this.key('reasons').optional().use(ReasonFlags),
    this.key('cRLIssuer').optional().use(GeneralNames)
  );
});

/**
 * ### Distribution Point Name
 */

var DistributionPointName =
rfc5280.DistributionPointName = asn1.define('DistributionPointName', function() {
  this.choice({
    fullName: this.use(GeneralNames),
    nameRelativeToCRLIssuer: this.use(RelativeDistinguishedName)
  });
});

/**
 * #### Relative Distinguished Name
 */

var RelativeDistinguishedName =
rfc5280.RelativeDistinguishedName = asn1.define('RelativeDistinguishedName', function() {
  this.setof(AttributeTypeAndValue);
});

/**
 * ### Reason Flags
 */

var ReasonFlags =
rfc5280.ReasonFlags = asn1.define('ReasonFlags', function() {
  this.bitstr();
});

/**
 * 14
 * # Inhibit anyPolicy
 */

var InhibitAnyPolicy =
rfc5280.InhibitAnyPolicy = asn1.define('InhibitAnyPolicy', function() {
  this.use(SkipCerts);
});

/**
 * 15
 * # Freshest CRL
 */

var FreshestCRL =
rfc5280.FreshestCRL = asn1.define('FreshestCRL', function() {
  this.use(CRLDistributionPoints);
});

/**
 * Private Internet Extensions
 */

/**
 * 16
 * # Authority Information Access
 */

var AuthorityInformationAccess =
rfc5280.AuthorityInformationAccess = asn1.define('AuthorityInformationAccess', function() {
  this.seqof(AccessDescription);
});

/**
 * ## Access Description
 */

var AccessDescription =
rfc5280.AccessDescription = asn1.define('AccessDescription', function() {
  this.seq().obj(
    this.key('accessMethod').objid(),
    this.key('accessLocation').use(GeneralName)
  );
});

/**
 * 17
 * # Subject Information Access
 */

var SubjectInformationAccess =
rfc5280.SubjectInformationAccess = asn1.define('SubjectInformationAccess', function() {
  this.seqof(AccessDescription);
});

/**
 * XXX
 * # Unknown Extension
 */

var UnknownExtension =
rfc5280.UnknownExtension = asn1.define('UnknownExtension', function() {
  this.any();
});


rfc5280.extensions = {
  standard: {
    // id-ce extensions - Standard Extensions
    prefix: [2, 5, 29],
    35: 'Authority Key Identifier',
    14: 'Subject Key Identifier',
    // VERY IMPORTANT, especially is cA (basic constraints) is true (it is)
    15: {
      name: 'Key Usage',
      parse: function(decoded, cert, ext, edata) {
        // For bitstr: KeyUsage
        var data = decoded.data[0];
        return {
          digitalSignature: !!((data >> 0) & 1),
          nonRepudiation: !!((data >> 1) & 1),
          // nonRepudiation renamed to contentCommitment:
          contentCommitment: !!((data >> 1) & 1),
          keyEncipherment: !!((data >> 2) & 1),
          dataEncipherment: !!((data >> 3) & 1),
          keyAgreement: !!((data >> 4) & 1),
          keyCertSign: !!((data >> 5) & 1),
          cRLSign: !!((data >> 6) & 1),
          encipherOnly: !!((data >> 7) & 1),
          decipherOnly: !!((data >> 8) & 1)
        };
      },
      execute: function(cert) {
        return cert;
      }
    },
    32: 'Certificate Policies',
    33: 'Policy Mappings',
    17: 'Subject Alternative Name',
    18: 'Issuer Alternative Name',
     9: 'Subject Directory Attributes',
    19: 'Basic Constraints',
    30: 'Name Constraints',
    36: 'Policy Constraints',
    37: 'Extended Key Usage',
    31: {
      name: 'CRL Distribution Points',
      parse: function(decoded, cert, ext, edata) {
        // XXX Find the bitstr: ReasonFlags
        print('@@@@@@@@@@@@@@@@@@@@@@@@@@@');
        print(decoded);
        print(cert);
        print(ext);
        print(edata);
        print('@@@@@@@@@@@@@@@@@@@@@@@@@@@');
        return decoded;
        // For bitstr: ReasonFlags
        var data = decoded.CRLDistributionPoints.DistributionPoint.reasons;
        return {
          unused: !!((data >> 0) & 1),
          keyCompromise: !!((data >> 1) & 1),
          cACompromise: !!((data >> 2) & 1),
          affiliationChanged: !!((data >> 3) & 1),
          superseded: !!((data >> 4) & 1),
          cessationOfOperation: !!((data >> 5) & 1),
          certificateHold: !!((data >> 6) & 1),
          privilegeWithdrawn: !!((data >> 7) & 1),
          aACompromise: !!((data >> 8) & 1)
        };
      },
      execute: function(cert) {
        return cert;
      }
    },
    54: 'Inhibit anyPolicy',
    46: 'Freshest CRL'
  },

  // id-pe extensions - Private Internet Extensions
  priv: {
    // Unknown extension: 1.3.6.1.5.5.7.1.1
    prefix: [1, 3, 6, 1, 5, 5, 7],
     1: 'Authority Information Access',
    11: 'Subject Information Access',
    // Unknown Extension (not documented anywhere, probably non-standard)
     '1.1': 'Unknown Extension'
  }
};

Object.keys(rfc5280.extensions).forEach(function(typeName) {
  var type = rfc5280.extensions[typeName];
  Object.keys(type).forEach(function(suffix) {
    var id, prop, schemaName, schema, parse, execute;

    if (suffix === 'prefix')
      return;

    var prefix = type.prefix;
    var name = type[suffix];

    if (typeof name === 'object') {
      var obj = name;
      name = obj.name;
      parse = obj.parse;
      execute = obj.execute;
    }

    id = prefix.concat(suffix).join('.');

    if (/^[A-Z]+ /.test(name)) {
      // CRL Distribution Points - > CRLDistributionPoints
      prop = name.replace(/ /g, '');
    } else {
      prop = (name[0].toLowerCase()) + name.substring(1).replace(/ /g, '');
    }

    schemaName = name.replace(/ /g, '');
    schema = rfc5280[schemaName];

    rfc5280.extensions[id] = {
      typeName: typeName,
      prefix: prefix,
      suffix: suffix,
      id: id,
      name: name,
      prop: prop,
      schemaName: schemaName,
      schema: schema,
      parse: parse,
      execute: execute
    };
  });
});

rfc5280.decodeExtensions = function(cert, options) {
  var tbsCertificate = cert.tbsCertificate;

  if (!tbsCertificate) {
    tbsCertificate = cert;
    cert = null;
  }

  var edata, eid, ext, decoded, errors, data;

  var output = {};
  output.unknown = [];

  for (var i = 0; i < tbsCertificate.extensions.length; i++) {
    edata = tbsCertificate.extensions[i];
    eid = edata.extnID.join('.');

    if (ext = rfc5280.extensions[eid]) {
      // Parse Extension
      decoded = ext.schema.decode(edata.extnValue, 'der', options);

      // partial: true throws everything onto: { result: ..., errors: ... }
      if (options.partial && decoded.result) {
        errors = decoded.errors;
        if (Array.isArray(decoded.result)) {
          decoded = decoded.result.map(function(decoded) {
            decoded.errors.forEach(function(error) {
              errors.push(error);
            });
            return decoded.result;
          });
        } else {
          decoded = decoded.result;
        }
      }

      // If the Extension needs extra parsing (i.e. bitstrs)
      data = ext.parse
        ? ext.parse(decoded, cert, ext, edata)
        : decoded;

      // Tack on some useful info

      // Comment for debugging:
      // data.edata = edata;
      // data.ext = ext;
      if (ext.parse) {
        data.decoded = decoded;
      }

      // Execute Behavior for Cert
      if (ext.execute) {
        data.execute = ext.execute;
      }

      // Add errors for partial: true
      if (options.partial && errors) {
        data.errors = errors;
      }

      // Add our decoded extension to the output
      output[ext.prop] = data;

      // XXX Debug
      print('------------');
      print('%s (%s):', ext.name, ext.id);
      print('Buffer:');
      print(edata.extnValue);
      print('Extension:');
      print(data);
    } else {
      // Add unknown extension:
      output.unknown.push(edata);

      // XXX Debug
      print('Unknown extension: %s', eid);
    }
  }

  output.verified = !output.unknown.filter(function(ext) {
    return ext.critical;
  }).length;

  return output;
};

/**
 * Debug
 */

var util = require('util');

function inspect(obj) {
  return typeof obj !== 'string'
    ? util.inspect(obj, false, 20, true)
    : obj;
}

function print(obj) {
  return typeof obj === 'object'
    ? process.stdout.write(inspect(obj) + '\n')
    : console.log.apply(console, arguments);
}

module.exports = PayPro;