Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_keychain / lib / Certificate.cpp

/*
 * Copyright (c) 2002-2007,2011-2014 Apple Inc. All Rights Reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

//
// Certificate.cpp
//
#include <security_keychain/Certificate.h>
#include <security_cdsa_utilities/Schema.h>
#include <Security/oidscert.h>
#include <Security/oidsattr.h>
#include <Security/SecCertificate.h>
#include <Security/SecCertificatePriv.h>
#include <security_cdsa_client/cspclient.h>
#include <security_keychain/KeyItem.h>
#include <security_keychain/KCCursor.h>
#include <vector>
#include <CommonCrypto/CommonDigestSPI.h>
#include <SecBase.h>

using namespace KeychainCore;

CL
Certificate::clForType(CSSM_CERT_TYPE type)
{
        return CL(gGuidAppleX509CL);
}

Certificate::Certificate(const CSSM_DATA &data, CSSM_CERT_TYPE type, CSSM_CERT_ENCODING encoding) :
        ItemImpl(CSSM_DL_DB_RECORD_X509_CERTIFICATE, reinterpret_cast<SecKeychainAttributeList *>(NULL), UInt32(data.Length), reinterpret_cast<const void *>(data.Data)),
        mHaveTypeAndEncoding(true),
        mPopulated(false),
        mType(type),
        mEncoding(encoding),
        mCL(clForType(type)),
        mCertHandle(0),
        mV1SubjectPublicKeyCStructValue(NULL),
        mV1SubjectNameCStructValue(NULL),
        mV1IssuerNameCStructValue(NULL),
        mSha1Hash(NULL)
{
        if (data.Length == 0 || data.Data == NULL)
                MacOSError::throwMe(errSecParam);
}

// db item constructor
Certificate::Certificate(const Keychain &keychain, const PrimaryKey &primaryKey, const CssmClient::DbUniqueRecord &uniqueId) :
        ItemImpl(keychain, primaryKey, uniqueId),
        mHaveTypeAndEncoding(false),
        mPopulated(false),
        mCL(NULL),
        mCertHandle(0),
        mV1SubjectPublicKeyCStructValue(NULL),
        mV1SubjectNameCStructValue(NULL),
        mV1IssuerNameCStructValue(NULL),
        mSha1Hash(NULL)
{
}



Certificate* Certificate::make(const Keychain &keychain, const PrimaryKey &primaryKey, const CssmClient::DbUniqueRecord &uniqueId)
{
        Certificate* c = new Certificate(keychain, primaryKey, uniqueId);
        keychain->addItem(primaryKey, c);
        return c;
}



Certificate* Certificate::make(const Keychain &keychain, const PrimaryKey &primaryKey)
{
        Certificate* c = new Certificate(keychain, primaryKey);
        keychain->addItem(primaryKey, c);
        return c;
}




// PrimaryKey item constructor
Certificate::Certificate(const Keychain &keychain, const PrimaryKey &primaryKey) :
        ItemImpl(keychain, primaryKey),
        mHaveTypeAndEncoding(false),
        mPopulated(false),
        mCL(NULL),
        mCertHandle(0),
        mV1SubjectPublicKeyCStructValue(NULL),
        mV1SubjectNameCStructValue(NULL),
        mV1IssuerNameCStructValue(NULL),
        mSha1Hash(NULL)
{
        // @@@ In this case we don't know the type...
}

Certificate::Certificate(Certificate &certificate) :
        ItemImpl(certificate),
        mHaveTypeAndEncoding(certificate.mHaveTypeAndEncoding),
        mPopulated(false /* certificate.mPopulated */),
        mType(certificate.mType),
        mEncoding(certificate.mEncoding),
        mCL(certificate.mCL),
        mCertHandle(0),
        mV1SubjectPublicKeyCStructValue(NULL),
        mV1SubjectNameCStructValue(NULL),
        mV1IssuerNameCStructValue(NULL),
        mSha1Hash(NULL)
{
}

Certificate::~Certificate()
try
{
        if (mV1SubjectPublicKeyCStructValue)
                releaseFieldValue(CSSMOID_X509V1SubjectPublicKeyCStruct, mV1SubjectPublicKeyCStructValue);

        if (mCertHandle && mCL)
                CSSM_CL_CertAbortCache(mCL->handle(), mCertHandle);

        if (mV1SubjectNameCStructValue)
                releaseFieldValue(CSSMOID_X509V1SubjectNameCStruct, mV1SubjectNameCStructValue);

        if (mV1IssuerNameCStructValue)
                releaseFieldValue(CSSMOID_X509V1IssuerNameCStruct, mV1IssuerNameCStructValue);

        if (mSha1Hash)
                CFRelease(mSha1Hash);
}
catch (...)
{
}

CSSM_HANDLE
Certificate::certHandle()
{
        StLock<Mutex>_(mMutex);
        const CSSM_DATA *cert = &data();
        if (!mCertHandle)
        {
                if (CSSM_RETURN retval = CSSM_CL_CertCache(clHandle(), cert, &mCertHandle))
                        CssmError::throwMe(retval);
        }

        return mCertHandle;
}

/* Return a zero terminated list of CSSM_DATA_PTR's with the values of the field specified by field.  Caller must call releaseFieldValues to free the storage allocated by this call.  */
CSSM_DATA_PTR *
Certificate::copyFieldValues(const CSSM_OID &field)
{
        StLock<Mutex>_(mMutex);
        CSSM_CL_HANDLE clh = clHandle();
        CSSM_DATA_PTR fieldValue, *fieldValues;
        CSSM_HANDLE resultsHandle = 0;
        uint32 numberOfFields = 0;
        CSSM_RETURN result;

        result = CSSM_CL_CertGetFirstCachedFieldValue(clh, certHandle(), &field, &resultsHandle, &numberOfFields, &fieldValue);
        if (result)
        {
                if (result == CSSMERR_CL_NO_FIELD_VALUES)
                        return NULL;

                CssmError::throwMe(result);
        }

        fieldValues = new CSSM_DATA_PTR[numberOfFields + 1];
        fieldValues[0] = fieldValue;
        fieldValues[numberOfFields] = NULL;

        for (uint32 value = 1; value < numberOfFields; ++value)
        {
                CSSM_RETURN cresult = CSSM_CL_CertGetNextCachedFieldValue(clh, resultsHandle, &fieldValues[value]);
                if (cresult)
                {
                        fieldValues[value] = NULL;
                        result = cresult;
                        break; // No point in continuing really.
                }
        }

        CSSM_CL_CertAbortQuery(clh, resultsHandle);

        if (result)
        {
                releaseFieldValues(field, fieldValues);
                CssmError::throwMe(result);
        }

        return fieldValues;
}

void
Certificate::releaseFieldValues(const CSSM_OID &field, CSSM_DATA_PTR *fieldValues)
{
        StLock<Mutex>_(mMutex);
        if (fieldValues)
        {
                CSSM_CL_HANDLE clh = clHandle();

                for (int ix = 0; fieldValues[ix]; ++ix)
                        CSSM_CL_FreeFieldValue(clh, &field, fieldValues[ix]);

                delete[] fieldValues;
        }
}

void
Certificate::addParsedAttribute(const CSSM_DB_ATTRIBUTE_INFO &info, const CSSM_OID &field)
{
        StLock<Mutex>_(mMutex);
        CSSM_DATA_PTR *fieldValues = copyFieldValues(field);
        if (fieldValues)
        {
                CssmDbAttributeData &anAttr = mDbAttributes->add(info);
                for (int ix = 0; fieldValues[ix]; ++ix)
                        anAttr.add(*fieldValues[ix], *mDbAttributes);

                releaseFieldValues(field, fieldValues);
        }
}

void
Certificate::addSubjectKeyIdentifier()
{
        StLock<Mutex>_(mMutex);
        const CSSM_DB_ATTRIBUTE_INFO &info = Schema::attributeInfo(kSecSubjectKeyIdentifierItemAttr);
        const CSSM_OID &field = CSSMOID_SubjectKeyIdentifier;

        CSSM_DATA_PTR *fieldValues = copyFieldValues(field);
        if (fieldValues)
        {
                CssmDbAttributeData &anAttr = mDbAttributes->add(info);
                for (int ix = 0; fieldValues[ix]; ++ix)
                {
                        const CSSM_X509_EXTENSION *extension = reinterpret_cast<const CSSM_X509_EXTENSION *>(fieldValues[ix]->Data);
                        if (extension == NULL || fieldValues[ix]->Length != sizeof(CSSM_X509_EXTENSION))
                        {
                                assert(extension != NULL && fieldValues[ix]->Length == sizeof(CSSM_X509_EXTENSION));
                                continue;
                        }
                        const CE_SubjectKeyID *skid = reinterpret_cast<CE_SubjectKeyID *>(extension->value.parsedValue);
                        if (skid == NULL)
                        {
                                assert(skid != NULL);
                                continue;
                        }
                        anAttr.add(*skid, *mDbAttributes);
                }

                releaseFieldValues(field, fieldValues);
        }
}

/* Return a CSSM_DATA_PTR with the value of the first field specified by field.  Caller must call releaseFieldValue to free the storage allocated by this call.  */
CSSM_DATA_PTR
Certificate::copyFirstFieldValue(const CSSM_OID &field)
{
        StLock<Mutex>_(mMutex);
        CSSM_CL_HANDLE clh = clHandle();
        CSSM_DATA_PTR fieldValue;
        CSSM_HANDLE resultsHandle = 0;
        uint32 numberOfFields = 0;
        CSSM_RETURN result;

        result = CSSM_CL_CertGetFirstCachedFieldValue(clh, certHandle(), &field, &resultsHandle, &numberOfFields, &fieldValue);
        if (result)
        {
                if (result == CSSMERR_CL_NO_FIELD_VALUES)
                        return NULL;

                CssmError::throwMe(result);
        }

        result = CSSM_CL_CertAbortQuery(clh, resultsHandle);

        if (result)
        {
                releaseFieldValue(field, fieldValue);
                CssmError::throwMe(result);
        }

        return fieldValue;
}

void
Certificate::releaseFieldValue(const CSSM_OID &field, CSSM_DATA_PTR fieldValue)
{
        StLock<Mutex>_(mMutex);
        if (fieldValue)
        {
                CSSM_CL_HANDLE clh = clHandle();
                CSSM_CL_FreeFieldValue(clh, &field, fieldValue);
        }
}



/*
        This method computes the keyIdentifier for the public key in the cert as
        described below:

      The keyIdentifier is composed of the 160-bit SHA-1 hash of the
      value of the BIT STRING subjectPublicKey (excluding the tag,
      length, and number of unused bits).
*/
const CssmData &
Certificate::publicKeyHash()
{
        StLock<Mutex>_(mMutex);
        if (mPublicKeyHash.Length)
                return mPublicKeyHash;

        CSSM_DATA_PTR keyPtr = copyFirstFieldValue(CSSMOID_CSSMKeyStruct);
        if (keyPtr && keyPtr->Data)
        {
                CssmClient::CSP csp(gGuidAppleCSP);
                CssmClient::PassThrough passThrough(csp);
                CSSM_KEY *key = reinterpret_cast<CSSM_KEY *>(keyPtr->Data);
                void *outData;
                CssmData *cssmData;

                /* Given a CSSM_KEY_PTR in any format, obtain the SHA-1 hash of the
                 * associated key blob.
                 * Key is specified in CSSM_CSP_CreatePassThroughContext.
                 * Hash is allocated by the CSP, in the App's memory, and returned
                 * in *outData. */
                passThrough.key(key);
                passThrough(CSSM_APPLECSP_KEYDIGEST, NULL, &outData);
                cssmData = reinterpret_cast<CssmData *>(outData);

                assert(cssmData->Length <= sizeof(mPublicKeyHashBytes));
                mPublicKeyHash.Data = mPublicKeyHashBytes;
                mPublicKeyHash.Length = cssmData->Length;
                memcpy(mPublicKeyHash.Data, cssmData->Data, cssmData->Length);
                csp.allocator().free(cssmData->Data);
                csp.allocator().free(cssmData);
        }

        releaseFieldValue(CSSMOID_CSSMKeyStruct, keyPtr);

        return mPublicKeyHash;
}

const CssmData &
Certificate::subjectKeyIdentifier()
{
        StLock<Mutex>_(mMutex);
        if (mSubjectKeyID.Length)
                return mSubjectKeyID;

        CSSM_DATA_PTR fieldValue = copyFirstFieldValue(CSSMOID_SubjectKeyIdentifier);
        if (fieldValue && fieldValue->Data && fieldValue->Length == sizeof(CSSM_X509_EXTENSION))
        {
                const CSSM_X509_EXTENSION *extension = reinterpret_cast<const CSSM_X509_EXTENSION *>(fieldValue->Data);
                const CE_SubjectKeyID *skid = reinterpret_cast<CE_SubjectKeyID *>(extension->value.parsedValue);        // CSSM_DATA

                if (skid->Length <= sizeof(mSubjectKeyIDBytes))
                {
                        mSubjectKeyID.Data = mSubjectKeyIDBytes;
                        mSubjectKeyID.Length = skid->Length;
                        memcpy(mSubjectKeyID.Data, skid->Data, skid->Length);
                }
                else
                        mSubjectKeyID.Length = 0;
        }

        releaseFieldValue(CSSMOID_SubjectKeyIdentifier, fieldValue);

        return mSubjectKeyID;
}


/*
 * Given an CSSM_X509_NAME, Find the first (or last) name/value pair with
 * a printable value which matches the specified OID (e.g., CSSMOID_CommonName).
 * Returns the CFString-style encoding associated with name component's BER tag.
 * Returns NULL if none found.
 */
static const CSSM_DATA *
findPrintableField(
        const CSSM_X509_NAME &x509Name,
        const CSSM_OID *tvpType,                                // NULL means "any printable field"
        bool lastInstance,                                              // false means return first instance
        CFStringBuiltInEncodings *encoding)             // RETURNED
{
        const CSSM_DATA *result = NULL;
        for(uint32 rdnDex=0; rdnDex<x509Name.numberOfRDNs; rdnDex++) {
                const CSSM_X509_RDN *rdnPtr =
                        &x509Name.RelativeDistinguishedName[rdnDex];
                for(uint32 tvpDex=0; tvpDex<rdnPtr->numberOfPairs; tvpDex++) {
                        const CSSM_X509_TYPE_VALUE_PAIR *tvpPtr =
                                &rdnPtr->AttributeTypeAndValue[tvpDex];

                        /* type/value pair: match caller's specified type? */
                        if(tvpType != NULL && tvpType->Data != NULL) {
                                if(tvpPtr->type.Length != tvpType->Length) {
                                        continue;
                                }
                                if(memcmp(tvpPtr->type.Data, tvpType->Data, tvpType->Length)) {
                                        /* If we don't have a match but the requested OID is CSSMOID_UserID,
                                         * look for a matching X.500 UserID OID: (0.9.2342.19200300.100.1.1)  */
                                        const char cssm_userid_oid[] = { 0x09,0x49,0x86,0x49,0x1f,0x12,0x8c,0xe4,0x81,0x81 };
                                        const char x500_userid_oid[] = { 0x09,0x92,0x26,0x89,0x93,0xF2,0x2C,0x64,0x01,0x01 };
                                        if(!(tvpType->Length == sizeof(cssm_userid_oid) &&
                                                !memcmp(tvpPtr->type.Data, x500_userid_oid, sizeof(x500_userid_oid)) &&
                                                !memcmp(tvpType->Data, cssm_userid_oid, sizeof(cssm_userid_oid)))) {
                                                continue;
                                        }
                                }
                        }

                        /* printable? */
                        switch(tvpPtr->valueType) {
                                case BER_TAG_PRINTABLE_STRING:
                                case BER_TAG_IA5_STRING:
                                        *encoding = kCFStringEncodingASCII;
                                        result = &tvpPtr->value;
                                        break;
                                case BER_TAG_PKIX_UTF8_STRING:
                                case BER_TAG_GENERAL_STRING:
                                case BER_TAG_PKIX_UNIVERSAL_STRING:
                                        *encoding = kCFStringEncodingUTF8;
                                        result = &tvpPtr->value;
                                        break;
                                case BER_TAG_T61_STRING:
                                case BER_TAG_VIDEOTEX_STRING:
                                case BER_TAG_ISO646_STRING:
                                        *encoding = kCFStringEncodingISOLatin1;
                                        result = &tvpPtr->value;
                                        break;
                                case BER_TAG_PKIX_BMP_STRING:
                                        *encoding = kCFStringEncodingUnicode;
                                        result = &tvpPtr->value;
                                        break;
                                default:
                                        /* not printable */
                                        break;
                        }
                        /* if we found a result and we want the first instance, return it now. */
                        if(result && !lastInstance) {
                                return result;
                        }

                }       /* for each pair */
        }               /* for each RDN */

        /* result is NULL if no printable component was found */
        return result;
}

/*
 * Infer printable label for a given CSSM_X509_NAME. Returns NULL
 * if no appropriate printable name found. Returns the CFString-style
 * encoding associated with name component's BER tag. Also optionally
 * returns Description component and its encoding if present and the
 * returned name component was one we explicitly requested.
 */
static const CSSM_DATA *inferLabelFromX509Name(
        const CSSM_X509_NAME *x509Name,
        CFStringBuiltInEncodings *encoding,                     // RETURNED
        const CSSM_DATA **description,                          // optionally RETURNED
        CFStringBuiltInEncodings *descrEncoding)        // RETURNED if description != NULL
{
        const CSSM_DATA *printValue;
        if(description != NULL) {
                *description = findPrintableField(*x509Name, &CSSMOID_Description, false, descrEncoding);
        }
        /*
         * Search order (take the first one found with a printable
         * value):
         *  -- common name
         *  -- Organizational Unit
         *  -- Organization
         *  -- email address
         *  -- field of any kind
         */
        printValue = findPrintableField(*x509Name, &CSSMOID_CommonName, true, encoding);
        if(printValue != NULL) {
                return printValue;
        }
        printValue = findPrintableField(*x509Name, &CSSMOID_OrganizationalUnitName, false, encoding);
        if(printValue != NULL) {
                return printValue;
        }
        printValue = findPrintableField(*x509Name, &CSSMOID_OrganizationName, false, encoding);
        if(printValue != NULL) {
                return printValue;
        }
        printValue = findPrintableField(*x509Name, &CSSMOID_EmailAddress, false, encoding);
        if(printValue != NULL) {
                return printValue;
        }
        /* if we didn't get one of the above names, don't append description */
        if(description != NULL) {
                *description = NULL;
        }
        /* take anything */
        return findPrintableField(*x509Name, NULL, false, encoding);
}

/*
 * Infer printable label for a given an CSSM_X509_NAME. Returns NULL
 * if no appropriate printable name found.
 */
const CSSM_DATA *SecInferLabelFromX509Name(
        const CSSM_X509_NAME *x509Name)
{
        /* callees of this routine don't care about the encoding */
        CFStringBuiltInEncodings encoding = kCFStringEncodingASCII;
        return inferLabelFromX509Name(x509Name, &encoding, NULL, &encoding);
}


void
Certificate::inferLabel(bool addLabel, CFStringRef *rtnString)
{
        StLock<Mutex>_(mMutex);
        // Set PrintName and optionally the Alias attribute for this certificate, based on the
        // X509 SubjectAltName and SubjectName.
        const CSSM_DATA *printName = NULL;
        const CSSM_DATA *description = NULL;
        std::vector<CssmData> emailAddresses;
        CSSM_DATA puntData;
        CssmAutoData printPlusDescr(Allocator::standard());
        CssmData printPlusDescData;
        CFStringBuiltInEncodings printEncoding = kCFStringEncodingUTF8;
        CFStringBuiltInEncodings descrEncoding = kCFStringEncodingUTF8;

        // Find the SubjectAltName fields, if any, and extract all the GNT_RFC822Name entries from all of them
        const CSSM_OID &sanOid = CSSMOID_SubjectAltName;
        CSSM_DATA_PTR *sanValues = copyFieldValues(sanOid);
        const CSSM_OID &snOid = CSSMOID_X509V1SubjectNameCStruct;
        CSSM_DATA_PTR snValue = copyFirstFieldValue(snOid);

        getNames(sanValues, snValue, GNT_RFC822Name, emailAddresses);

        if (snValue && snValue->Data)
        {
                const CSSM_X509_NAME &x509Name = *(const CSSM_X509_NAME *)snValue->Data;
                printName = inferLabelFromX509Name(&x509Name, &printEncoding,
                        &description, &descrEncoding);
        if (printName)
        {
            /* Don't ever use "Thawte Freemail Member" as the label for a cert.  Instead force
               a fall back on the email address. */
            const char tfm[] = "Thawte Freemail Member";
            if ( (printName->Length == sizeof(tfm) - 1) &&
                              !memcmp(printName->Data, tfm, sizeof(tfm) - 1)) {
                printName = NULL;
                        }
        }
        }

        /* Do a check to see if a '\0' was at the end of printName and strip it. */
        CssmData cleanedUpPrintName;
        if((printName != NULL) &&
           (printName->Length != 0) &&
           (printEncoding != kCFStringEncodingISOLatin1) &&
           (printEncoding != kCFStringEncodingUnicode) &&
           (printName->Data[printName->Length - 1] == '\0')) {
                cleanedUpPrintName.Data = printName->Data;
                cleanedUpPrintName.Length = printName->Length - 1;
                printName = &cleanedUpPrintName;
        }

        if((printName != NULL) && (description != NULL) && (description->Length != 0))
        {
                /*
                 * Munge Print Name (which in this case is the CommonName) and Description
                 * together with the Description in parentheses. We convert from whatever
                 * format Print Name and Description are in to UTF8 here.
                 */
                CFRef<CFMutableStringRef> combo(CFStringCreateMutable(NULL, 0));
                CFRef<CFStringRef> cfPrint(CFStringCreateWithBytes(NULL, printName->Data,
                        (CFIndex)printName->Length, printEncoding, true));
                CssmData cleanedUpDescr(description->Data, description->Length);
                if ((cleanedUpDescr.Data[cleanedUpDescr.Length - 1] == '\0') &&
                        (descrEncoding != kCFStringEncodingISOLatin1) &&
                        (descrEncoding != kCFStringEncodingUnicode)) {
                        cleanedUpDescr.Length--;
                }
                CFRef<CFStringRef> cfDesc(CFStringCreateWithBytes(NULL, cleanedUpDescr.Data,
                        (CFIndex)cleanedUpDescr.Length, descrEncoding, true));
                CFStringAppend(combo, cfPrint);
                CFStringAppendCString(combo, " (", kCFStringEncodingASCII);
                CFStringAppend(combo, cfDesc);
                CFStringAppendCString(combo, ")", kCFStringEncodingASCII);
                CFRef<CFDataRef> comboData(CFStringCreateExternalRepresentation(NULL, combo,
                        kCFStringEncodingUTF8, 0));
                printPlusDescr.copy(CFDataGetBytePtr(comboData), CFDataGetLength(comboData));
                printPlusDescData = printPlusDescr;
                printName = &printPlusDescData;
                printEncoding = kCFStringEncodingUTF8;
        }

        if (printName == NULL)
        {
                /* If the we couldn't find a label use the emailAddress instead. */
                if (!emailAddresses.empty())
                        printName = &emailAddresses[0];
                else
                {
                        /* punt! */
                        puntData.Data = (uint8 *)"X509 Certificate";
                        puntData.Length = 16;
                        printName = &puntData;
                }
                printEncoding = kCFStringEncodingUTF8;
        }

        /* If we couldn't find an email address just use the printName which might be the url or something else useful. */
        if (emailAddresses.empty())
                emailAddresses.push_back(CssmData::overlay(*printName));

        /* What do we do with the inferred label - return it or add it mDbAttributes? */
        if (addLabel)
        {
                mDbAttributes->add(Schema::kX509CertificatePrintName, *printName);
                CssmDbAttributeData &attrData = mDbAttributes->add(Schema::kX509CertificateAlias);

                /* Add the email addresses to attrData and normalize them. */
                uint32 ix = 0;
                for (std::vector<CssmData>::const_iterator it = emailAddresses.begin(); it != emailAddresses.end(); ++it, ++ix)
                {
                        /* Add the email address using the allocator from mDbAttributes. */
                        attrData.add(*it, *mDbAttributes);
                        /* Normalize the emailAddresses in place since attrData already copied it. */
                        normalizeEmailAddress(attrData.Value[ix]);
                }
        }

        if (rtnString)
        {
                CFStringBuiltInEncodings testEncoding = printEncoding;
                if(testEncoding == kCFStringEncodingISOLatin1) {
                        // try UTF-8 first
                        testEncoding = kCFStringEncodingUTF8;
                }
                *rtnString = CFStringCreateWithBytes(NULL, printName->Data,
                        (CFIndex)printName->Length, testEncoding, true);
                if(*rtnString == NULL && printEncoding == kCFStringEncodingISOLatin1) {
                        // string cannot be represented in UTF-8, fall back to ISO Latin 1
                        *rtnString = CFStringCreateWithBytes(NULL, printName->Data,
                                (CFIndex)printName->Length, printEncoding, true);
                }
        }

        // Clean up
        if (snValue)
                releaseFieldValue(snOid, snValue);
        if (sanValues)
                releaseFieldValues(sanOid, sanValues);
}

void
Certificate::populateAttributes()
{
        StLock<Mutex>_(mMutex);
        if (mPopulated)
                return;

        addParsedAttribute(Schema::attributeInfo(kSecSubjectItemAttr), CSSMOID_X509V1SubjectName);
        addParsedAttribute(Schema::attributeInfo(kSecIssuerItemAttr), CSSMOID_X509V1IssuerName);
        addParsedAttribute(Schema::attributeInfo(kSecSerialNumberItemAttr), CSSMOID_X509V1SerialNumber);

        addSubjectKeyIdentifier();

        if(!mHaveTypeAndEncoding)
                MacOSError::throwMe(errSecDataNotAvailable); // @@@ Or some other error.

        // Adjust mType based on the actual version of the cert.
        CSSM_DATA_PTR versionPtr = copyFirstFieldValue(CSSMOID_X509V1Version);
        if (versionPtr && versionPtr->Data && versionPtr->Length == sizeof(uint32))
        {
                mType = CSSM_CERT_X_509v1 + (*reinterpret_cast<uint32 *>(versionPtr->Data));
        }
        else
                mType = CSSM_CERT_X_509v1;

        releaseFieldValue(CSSMOID_X509V1Version, versionPtr);

        mDbAttributes->add(Schema::attributeInfo(kSecCertTypeItemAttr), mType);
        mDbAttributes->add(Schema::attributeInfo(kSecCertEncodingItemAttr), mEncoding);
        mDbAttributes->add(Schema::attributeInfo(kSecPublicKeyHashItemAttr), publicKeyHash());
        inferLabel(true);

        mPopulated = true;
}

const CssmData &
Certificate::data()
{
        StLock<Mutex>_(mMutex);
        CssmDataContainer *data = mData.get();
        if (!data && mKeychain)
        {
            // Make sure mUniqueId is set.
                dbUniqueRecord();
                CssmDataContainer _data;
                mData = NULL;
                /* new data allocated by CSPDL, implicitly freed by CssmDataContainer */
                mUniqueId->get(NULL, &_data);
                /* this saves a copy to be freed at destruction and to be passed to caller */
                setData((UInt32)_data.length(), _data.data());
                return *mData.get();
        }

        // If the data hasn't been set we can't return it.
        if (!data)
                MacOSError::throwMe(errSecDataNotAvailable);

        return *data;
}

CFHashCode Certificate::hash()
{
        (void)data();  // ensure that mData is set up
        return ItemImpl::hash();
}

CSSM_CERT_TYPE
Certificate::type()
{
        StLock<Mutex>_(mMutex);
        if (!mHaveTypeAndEncoding)
        {
                SecKeychainAttribute attr;
                attr.tag = kSecCertTypeItemAttr;
                attr.data = &mType;
                attr.length = sizeof(mType);
                getAttribute(attr, NULL);
        }

        return mType;
}

CSSM_CERT_ENCODING
Certificate::encoding()
{
        StLock<Mutex>_(mMutex);
        if (!mHaveTypeAndEncoding)
        {
                SecKeychainAttribute attr;
                attr.tag = kSecCertEncodingItemAttr;
                attr.data = &mEncoding;
                attr.length = sizeof(mEncoding);
                getAttribute(attr, NULL);
        }

        return mEncoding;
}

const CSSM_X509_ALGORITHM_IDENTIFIER_PTR
Certificate::algorithmID()
{
        StLock<Mutex>_(mMutex);
        if (!mV1SubjectPublicKeyCStructValue)
                mV1SubjectPublicKeyCStructValue = copyFirstFieldValue(CSSMOID_X509V1SubjectPublicKeyCStruct);

        CSSM_X509_SUBJECT_PUBLIC_KEY_INFO *info = (CSSM_X509_SUBJECT_PUBLIC_KEY_INFO *)mV1SubjectPublicKeyCStructValue->Data;
        CSSM_X509_ALGORITHM_IDENTIFIER *algid = &info->algorithm;
        return algid;
}

CFDataRef
Certificate::sha1Hash()
{
        StLock<Mutex>_(mMutex);
        if (!mSha1Hash) {
                SecCertificateRef certRef = handle(false);
                CFAllocatorRef allocRef = (certRef) ? CFGetAllocator(certRef) : NULL;
                CSSM_DATA certData = data();
                if (certData.Length == 0 || !certData.Data) {
                        MacOSError::throwMe(errSecDataNotAvailable);
                }
                const UInt8 *dataPtr = (const UInt8 *)certData.Data;
                CFIndex dataLen = (CFIndex)certData.Length;
                CFMutableDataRef digest = CFDataCreateMutable(allocRef, CC_SHA1_DIGEST_LENGTH);
                CFDataSetLength(digest, CC_SHA1_DIGEST_LENGTH);
                CCDigest(kCCDigestSHA1, dataPtr, dataLen, CFDataGetMutableBytePtr(digest));
                mSha1Hash = digest;
        }
        return mSha1Hash; /* object is owned by our instance; caller should NOT release it */
}

CFStringRef
Certificate::commonName()
{
        StLock<Mutex>_(mMutex);
        return distinguishedName(&CSSMOID_X509V1SubjectNameCStruct, &CSSMOID_CommonName);
}

CFStringRef
Certificate::distinguishedName(const CSSM_OID *sourceOid, const CSSM_OID *componentOid)
{
        StLock<Mutex>_(mMutex);
        CFStringRef rtnString = NULL;
        CSSM_DATA_PTR fieldValue = copyFirstFieldValue(*sourceOid);
        CSSM_X509_NAME_PTR x509Name = (CSSM_X509_NAME_PTR)fieldValue->Data;
        const CSSM_DATA *printValue = NULL;
        CFStringBuiltInEncodings encoding;

        if (fieldValue && fieldValue->Data)
                printValue = findPrintableField(*x509Name, componentOid, true, &encoding);

        if (printValue)
                rtnString = CFStringCreateWithBytes(NULL, printValue->Data,
                        CFIndex(printValue->Length), encoding, true);

        releaseFieldValue(*sourceOid, fieldValue);

        return rtnString;
}


/*
 * Return a CFString containing the first email addresses for this certificate, based on the
 * X509 SubjectAltName and SubjectName.
 */
CFStringRef
Certificate::copyFirstEmailAddress()
{
        StLock<Mutex>_(mMutex);
        CFStringRef rtnString;

        const CSSM_OID &sanOid = CSSMOID_SubjectAltName;
        CSSM_DATA_PTR *sanValues = copyFieldValues(sanOid);
        const CSSM_OID &snOid = CSSMOID_X509V1SubjectNameCStruct;
        CSSM_DATA_PTR snValue = copyFirstFieldValue(snOid);
        std::vector<CssmData> emailAddresses;

        getNames(sanValues, snValue, GNT_RFC822Name, emailAddresses);
        if (emailAddresses.empty())
                rtnString = NULL;
        else
        {
                /* Encoding is kCFStringEncodingUTF8 since the string is either
                   PRINTABLE_STRING, IA5_STRING, T61_STRING or PKIX_UTF8_STRING. */
                rtnString = CFStringCreateWithBytes(NULL, emailAddresses[0].Data,
                        (CFIndex)emailAddresses[0].Length, kCFStringEncodingUTF8, true);
        }

        // Clean up
        if (snValue)
                releaseFieldValue(snOid, snValue);
        if (sanValues)
                releaseFieldValues(sanOid, sanValues);

        return rtnString;
}

/*
 * Return a CFArray containing the DNS hostnames for this certificate, based on the
 * X509 SubjectAltName and SubjectName.
 */
CFArrayRef
Certificate::copyDNSNames()
{
        StLock<Mutex>_(mMutex);
        CFMutableArrayRef array = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
        std::vector<CssmData> dnsNames;

        // Find the SubjectAltName fields, if any, and extract the GNT_DNSName entries from all of them
        const CSSM_OID &sanOid = CSSMOID_SubjectAltName;
        CSSM_DATA_PTR *sanValues = copyFieldValues(sanOid);

        const CSSM_OID &snOid = CSSMOID_X509V1SubjectNameCStruct;
        CSSM_DATA_PTR snValue = copyFirstFieldValue(snOid);

        getNames(sanValues, snValue, GNT_DNSName, dnsNames);

        for (std::vector<CssmData>::const_iterator it = dnsNames.begin(); it != dnsNames.end(); ++it)
        {
                /* Encoding is kCFStringEncodingUTF8 since the string is either
                   PRINTABLE_STRING, IA5_STRING, T61_STRING or PKIX_UTF8_STRING. */
                CFStringRef string = CFStringCreateWithBytes(NULL, it->Data, static_cast<CFIndex>(it->Length), kCFStringEncodingUTF8, true);
                /* Be prepared for improperly formatted (non-UTF8) strings! */
                if (!string) continue;
                CFArrayAppendValue(array, string);
                CFRelease(string);
        }

        // Clean up
        if (snValue)
                releaseFieldValue(snOid, snValue);
        if (sanValues)
                releaseFieldValues(sanOid, sanValues);

        return array;
}

/*
 * Return a CFArray containing the email addresses for this certificate, based on the
 * X509 SubjectAltName and SubjectName.
 */
CFArrayRef
Certificate::copyEmailAddresses()
{
        StLock<Mutex>_(mMutex);
        CFMutableArrayRef array = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
        std::vector<CssmData> emailAddresses;

        // Find the SubjectAltName fields, if any, and extract all the GNT_RFC822Name entries from all of them
        const CSSM_OID &sanOid = CSSMOID_SubjectAltName;
        CSSM_DATA_PTR *sanValues = copyFieldValues(sanOid);

        const CSSM_OID &snOid = CSSMOID_X509V1SubjectNameCStruct;
        CSSM_DATA_PTR snValue = copyFirstFieldValue(snOid);

        getNames(sanValues, snValue, GNT_RFC822Name, emailAddresses);

        for (std::vector<CssmData>::const_iterator it = emailAddresses.begin(); it != emailAddresses.end(); ++it)
        {
                /* Encoding is kCFStringEncodingUTF8 since the string is either
                   PRINTABLE_STRING, IA5_STRING, T61_STRING or PKIX_UTF8_STRING. */
                CFStringRef string = CFStringCreateWithBytes(NULL, it->Data, static_cast<CFIndex>(it->Length), kCFStringEncodingUTF8, true);
                /* Be prepared for improperly formatted (non-UTF8) strings! */
                if (!string) continue;
                CFArrayAppendValue(array, string);
                CFRelease(string);
        }

        // Clean up
        if (snValue)
                releaseFieldValue(snOid, snValue);
        if (sanValues)
                releaseFieldValues(sanOid, sanValues);

        return array;
}

const CSSM_X509_NAME_PTR
Certificate::subjectName()
{
        StLock<Mutex>_(mMutex);
        if (!mV1SubjectNameCStructValue)
                if ((mV1SubjectNameCStructValue = copyFirstFieldValue(CSSMOID_X509V1SubjectNameCStruct)) == NULL)
            return NULL;

    return (const CSSM_X509_NAME_PTR)mV1SubjectNameCStructValue->Data;
}

const CSSM_X509_NAME_PTR
Certificate::issuerName()
{
        StLock<Mutex>_(mMutex);
        if (!mV1IssuerNameCStructValue)
                if ((mV1IssuerNameCStructValue = copyFirstFieldValue(CSSMOID_X509V1IssuerNameCStruct)) == NULL)
            return NULL;

    return (const CSSM_X509_NAME_PTR)mV1IssuerNameCStructValue->Data;
}

CSSM_CL_HANDLE
Certificate::clHandle()
{
        StLock<Mutex>_(mMutex);
        if (!mCL)
                mCL = clForType(type());

        return mCL->handle();
}

bool
Certificate::operator < (Certificate &other)
{
        // Certificates in different keychains are considered equal if data is equal
        // Note that the Identity '<' operator relies on this assumption.
        return data() < other.data();
}

bool
Certificate::operator == (Certificate &other)
{
        // Certificates in different keychains are considered equal if data is equal
        // Note that the Identity '==' operator relies on this assumption.
        return data() == other.data();
}

void
Certificate::update()
{
        ItemImpl::update();
}

Item
Certificate::copyTo(const Keychain &keychain, Access *newAccess)
{
        StLock<Mutex>_(mMutex);
        /* Certs can't have access controls. */
        if (newAccess)
                MacOSError::throwMe(errSecNoAccessForItem);

        Item item(new Certificate(data(), type(), encoding()));
        keychain->add(item);
        return item;
}

void
Certificate::didModify()
{
}

PrimaryKey
Certificate::add(Keychain &keychain)
{
        StLock<Mutex>_(mMutex);
        // If we already have a Keychain we can't be added.
        if (mKeychain)
                MacOSError::throwMe(errSecDuplicateItem);

        populateAttributes();

        CSSM_DB_RECORDTYPE recordType = mDbAttributes->recordType();

        Db db(keychain->database());
        // add the item to the (regular) db
        try
        {
                mUniqueId = db->insert(recordType, mDbAttributes.get(), mData.get());
        }
        catch (const CssmError &e)
        {
                if (e.osStatus() != CSSMERR_DL_INVALID_RECORDTYPE)
                        throw;

                // Create the cert relation and try again.
                db->createRelation(CSSM_DL_DB_RECORD_X509_CERTIFICATE,
                        "CSSM_DL_DB_RECORD_X509_CERTIFICATE",
                        Schema::X509CertificateSchemaAttributeCount,
                        Schema::X509CertificateSchemaAttributeList,
                        Schema::X509CertificateSchemaIndexCount,
                        Schema::X509CertificateSchemaIndexList);
                keychain->keychainSchema()->didCreateRelation(
                        CSSM_DL_DB_RECORD_X509_CERTIFICATE,
                        "CSSM_DL_DB_RECORD_X509_CERTIFICATE",
                        Schema::X509CertificateSchemaAttributeCount,
                        Schema::X509CertificateSchemaAttributeList,
                        Schema::X509CertificateSchemaIndexCount,
                        Schema::X509CertificateSchemaIndexList);

                mUniqueId = db->insert(recordType, mDbAttributes.get(), mData.get());
        }

        mPrimaryKey = keychain->makePrimaryKey(recordType, mUniqueId);
    mKeychain = keychain;

        return mPrimaryKey;
}

SecPointer<KeyItem>
Certificate::publicKey()
{
        StLock<Mutex>_(mMutex);
        SecPointer<KeyItem> keyItem;
        // Return a CSSM_DATA_PTR with the value of the first field specified by field.
        // Caller must call releaseFieldValue to free the storage allocated by this call.
        // call OSStatus SecKeyGetCSSMKey(SecKeyRef key, const CSSM_KEY **cssmKey); to retrieve

        CSSM_DATA_PTR keyPtr = copyFirstFieldValue(CSSMOID_CSSMKeyStruct);
        if (keyPtr && keyPtr->Data)
        {
                CssmClient::CSP csp(gGuidAppleCSP);
                CssmKey *cssmKey = reinterpret_cast<CssmKey *>(keyPtr->Data);
                CssmClient::Key key(csp, *cssmKey);
                keyItem = new KeyItem(key);
                // Clear out KeyData since KeyItem() takes over ownership of the key, and we don't want it getting released.
                cssmKey->KeyData.Data = NULL;
                cssmKey->KeyData.Length = 0;
        }

        releaseFieldValue(CSSMOID_CSSMKeyStruct, keyPtr);

        return keyItem;
}

// This function "borrowed" from the X509 CL, which is (currently) linked into
// the Security.framework as a built-in plugin.
extern "C" bool getField_normRDN_NSS (
        const CSSM_DATA         &derName,
        uint32                          &numFields,             // RETURNED (if successful, 0 or 1)
        CssmOwnedData           &fieldValue);   // RETURNED

KCCursor
Certificate::cursorForIssuerAndSN(const StorageManager::KeychainList &keychains, const CssmData &issuer, const CssmData &serialNumber)
{
        CssmAutoData fieldValue(Allocator::standard(Allocator::normal));
        uint32 numFields;

        // We need to decode issuer, normalize it, then re-encode it
        if (!getField_normRDN_NSS(issuer, numFields, fieldValue))
                MacOSError::throwMe(errSecDataNotAvailable);

        // Code basically copied from SecKeychainSearchCreateFromAttributes and SecKeychainSearchCopyNext:
        KCCursor cursor(keychains, kSecCertificateItemClass, NULL);
        cursor->conjunctive(CSSM_DB_AND);
        cursor->add(CSSM_DB_EQUAL, Schema::kX509CertificateIssuer, fieldValue.get());
        cursor->add(CSSM_DB_EQUAL, Schema::kX509CertificateSerialNumber, serialNumber);

        return cursor;
}

KCCursor
Certificate::cursorForIssuerAndSN_CF(const StorageManager::KeychainList &keychains, CFDataRef issuer, CFDataRef serialNumber)
{
        // This assumes a normalized issuer
        CSSM_DATA issuerCSSM, serialNumberCSSM;

        issuerCSSM.Length = CFDataGetLength(issuer);
        issuerCSSM.Data = const_cast<uint8 *>(CFDataGetBytePtr(issuer));

        serialNumberCSSM.Length = CFDataGetLength(serialNumber);
        serialNumberCSSM.Data = const_cast<uint8 *>(CFDataGetBytePtr(serialNumber));

        // Code basically copied from SecKeychainSearchCreateFromAttributes and SecKeychainSearchCopyNext:
        KCCursor cursor(keychains, kSecCertificateItemClass, NULL);
        cursor->conjunctive(CSSM_DB_AND);
        cursor->add(CSSM_DB_EQUAL, Schema::kX509CertificateIssuer, issuerCSSM);
        cursor->add(CSSM_DB_EQUAL, Schema::kX509CertificateSerialNumber, serialNumberCSSM);

        return cursor;
}

KCCursor
Certificate::cursorForSubjectKeyID(const StorageManager::KeychainList &keychains, const CssmData &subjectKeyID)
{
        KCCursor cursor(keychains, kSecCertificateItemClass, NULL);
        cursor->conjunctive(CSSM_DB_AND);
        cursor->add(CSSM_DB_EQUAL, Schema::kX509CertificateSubjectKeyIdentifier, subjectKeyID);

        return cursor;
}

KCCursor
Certificate::cursorForEmail(const StorageManager::KeychainList &keychains, const char *emailAddress)
{
        KCCursor cursor(keychains, kSecCertificateItemClass, NULL);
        if (emailAddress)
        {
                cursor->conjunctive(CSSM_DB_AND);
                CssmSelectionPredicate &pred = cursor->add(CSSM_DB_EQUAL, Schema::kX509CertificateAlias, emailAddress);
                /* Normalize the emailAddresses in place since cursor already copied it. */
                normalizeEmailAddress(pred.Attribute.Value[0]);
        }

        return cursor;
}

SecPointer<Certificate>
Certificate::findInKeychain(const StorageManager::KeychainList &keychains)
{
        StLock<Mutex>_(mMutex);
        const CSSM_OID &issuerOid = CSSMOID_X509V1IssuerName;
        CSSM_DATA_PTR issuerPtr = copyFirstFieldValue(issuerOid);
        CssmData issuer(issuerPtr->Data, issuerPtr->Length);

        const CSSM_OID &serialOid = CSSMOID_X509V1SerialNumber;
        CSSM_DATA_PTR serialPtr = copyFirstFieldValue(serialOid);
        CssmData serial(serialPtr->Data, serialPtr->Length);

        SecPointer<Certificate> foundCert = NULL;
        try {
                foundCert = findByIssuerAndSN(keychains, issuer, serial);
        } catch (...) {
                foundCert = NULL;
        }

        releaseFieldValue(issuerOid, issuerPtr);
        releaseFieldValue(serialOid, serialPtr);

        return foundCert;
}

SecPointer<Certificate>
Certificate::findByIssuerAndSN(const StorageManager::KeychainList &keychains, const CssmData &issuer, const CssmData &serialNumber)
{
        Item item;
        if (!cursorForIssuerAndSN(keychains, issuer, serialNumber)->next(item))
                CssmError::throwMe(errSecItemNotFound);

        return static_cast<Certificate *>(&*item);
}

SecPointer<Certificate>
Certificate::findBySubjectKeyID(const StorageManager::KeychainList &keychains, const CssmData &subjectKeyID)
{
        Item item;
        if (!cursorForSubjectKeyID(keychains, subjectKeyID)->next(item))
                CssmError::throwMe(errSecItemNotFound);

        return static_cast<Certificate *>(&*item);
}

SecPointer<Certificate>
Certificate::findByEmail(const StorageManager::KeychainList &keychains, const char *emailAddress)
{
        Item item;
        if (!cursorForEmail(keychains, emailAddress)->next(item))
                CssmError::throwMe(errSecItemNotFound);

        return static_cast<Certificate *>(&*item);
}

/* Normalize emailAddresses in place. */
void
Certificate::normalizeEmailAddress(CSSM_DATA &emailAddress)
{
        /* Do a check to see if a '\0' was at the end of emailAddress and strip it. */
        if (emailAddress.Length && emailAddress.Data[emailAddress.Length - 1] == '\0')
                emailAddress.Length--;
        bool foundAt = false;
        for (uint32 ix = 0; ix < emailAddress.Length; ++ix)
        {
                uint8 ch = emailAddress.Data[ix];
                if (foundAt)
                {
                        if ('A' <= ch && ch <= 'Z')
                                emailAddress.Data[ix] = ch + 'a' - 'A';
                }
                else if (ch == '@')
                        foundAt = true;
        }
}

void
Certificate::getNames(CSSM_DATA_PTR *sanValues, CSSM_DATA_PTR snValue, CE_GeneralNameType generalNameType, std::vector<CssmData> &names)
{
        // Get the DNS host names or RFC822 email addresses for this certificate (depending on generalNameType),
        // within the X509 SubjectAltName and SubjectName.

        // Find the SubjectAltName fields, if any, and extract the nameType entries from all of them
        if (sanValues)
        {
                for (CSSM_DATA_PTR *sanIx = sanValues; *sanIx; ++sanIx)
                {
                        CSSM_DATA_PTR sanValue = *sanIx;
                        if (sanValue && sanValue->Data)
                        {
                                CSSM_X509_EXTENSION *cssmExt = (CSSM_X509_EXTENSION *)sanValue->Data;
                                CE_GeneralNames *parsedValue = (CE_GeneralNames *)cssmExt->value.parsedValue;

                                /* Grab all the values that are of the specified name type. */
                                for (uint32 i = 0; i < parsedValue->numNames; ++i)
                                {
                                        if (parsedValue->generalName[i].nameType == generalNameType)
                                        {
                                                if (parsedValue->generalName[i].berEncoded) // can't handle this
                                                        continue;

                                                names.push_back(CssmData::overlay(parsedValue->generalName[i].name));
                                        }
                                }
                        }
                }
        }

        if (names.empty() && snValue && snValue->Data)
        {
                const CSSM_X509_NAME &x509Name = *(const CSSM_X509_NAME *)snValue->Data;
                for (uint32 rdnDex = 0; rdnDex < x509Name.numberOfRDNs; rdnDex++)
                {
                        const CSSM_X509_RDN *rdnPtr =
                                &x509Name.RelativeDistinguishedName[rdnDex];
                        for (uint32 tvpDex = 0; tvpDex < rdnPtr->numberOfPairs; tvpDex++)
                        {
                                const CSSM_X509_TYPE_VALUE_PAIR *tvpPtr =
                                        &rdnPtr->AttributeTypeAndValue[tvpDex];

                                /* type/value pair: match caller's specified type */
                                if (GNT_RFC822Name == generalNameType) {
                                        if (((tvpPtr->type.Length != CSSMOID_EmailAddress.Length) ||
                                                memcmp(tvpPtr->type.Data, CSSMOID_EmailAddress.Data, CSSMOID_EmailAddress.Length))) {
                                                        continue;
                                        }
                                }
                                if (GNT_DNSName == generalNameType) {
                                        if (((tvpPtr->type.Length != CSSMOID_CommonName.Length) ||
                                                memcmp(tvpPtr->type.Data, CSSMOID_CommonName.Data, CSSMOID_CommonName.Length))) {
                                                        continue;
                                        }
                                }

                                /* printable? */
                                switch (tvpPtr->valueType)
                                {
                                        case BER_TAG_PRINTABLE_STRING:
                                        case BER_TAG_IA5_STRING:
                                        case BER_TAG_T61_STRING:
                                        case BER_TAG_PKIX_UTF8_STRING:
                                                /* success */
                                                names.push_back(CssmData::overlay(tvpPtr->value));
                                                break;
                                        default:
                                                break;
                                }
                        }       /* for each pair */
                }               /* for each RDN */
        }
}

void Certificate::willRead()
{
        populateAttributes();
}

Boolean Certificate::isSelfSigned()
{
        StLock<Mutex>_(mMutex);
        CSSM_DATA_PTR issuer = NULL;
        CSSM_DATA_PTR subject = NULL;
        OSStatus ortn = errSecSuccess;
        Boolean brtn = false;

        issuer  = copyFirstFieldValue(CSSMOID_X509V1IssuerNameStd);
        subject = copyFirstFieldValue(CSSMOID_X509V1SubjectNameStd);
        if((issuer == NULL) || (subject == NULL)) {
                ortn = errSecParam;
        }
        else if((issuer->Length == subject->Length) &&
                !memcmp(issuer->Data, subject->Data, issuer->Length)) {
                brtn = true;
        }
        if(brtn) {
                /* names match: verify signature */
                CSSM_RETURN crtn;
                CSSM_DATA certData = data();
                crtn = CSSM_CL_CertVerify(clHandle(), 0,
                        &certData, &certData, NULL, 0);
                if(crtn) {
                        brtn = false;
                }
        }
        if(issuer) {
                releaseFieldValue(CSSMOID_X509V1IssuerNameStd,  issuer);
        }
        if(subject) {
                releaseFieldValue(CSSMOID_X509V1SubjectNameStd, subject);
        }
        if(ortn) {
                MacOSError::throwMe(ortn);
        }
        return brtn;
}