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<concept id="GUID-AE96F25E-45A2-5C00-9F27-BB3E17C8E6E5" xml:lang="en"><title>Certificate

and Key Management Overview</title><abstract><p>The Certificate and Key Management component provides authentication

services for <xref href="GUID-FB2CAA46-8EBB-5F76-847C-F3B953C9D31C.dita">Public

Key Cryptography</xref>.</p></abstract><prolog><metadata><keywords/></metadata></prolog><conbody>

<section><title>Purpose</title> <p>The main purpose of the Certificate and

Key Management component is to provide validation services according to the

Public Key Infrastructure (PKI) for <xref href="GUID-C676C4E6-93AF-59E9-886D-74D59F154490.dita">X.509</xref> Certificates. </p> <p>The

Certificate and Key Management component provides interfaces for the following: </p> <ul>

<li id="GUID-A3109F52-09A5-5ACD-9844-883EB9E6E37B"><p>Storage and retrieval

of certificates </p> </li>

<li id="GUID-27F48C66-606E-594D-A1E0-8E1B7C048C6B"><p>Assignment of trust

status to a certificate on an application-by-application basis </p> </li>

<li id="GUID-CF4BAB94-8FC1-5375-BDA6-1DA46DF3F68B"><p>Certificate chain construction

and validation </p> </li>

<li id="GUID-C44175FE-15D6-5145-8F73-CAC7F10A506A"><p>Verification of trust

of a certificate </p> </li>

<li id="GUID-EFDD6039-5F57-5F41-B90C-2776B247F659"><p>Generation of asymmetric

key pairs </p> </li>

<li id="GUID-AB119A48-43E3-5C5F-80B6-F1A92E9B6531"><p>Protected storage of

keys </p> </li>

<li id="GUID-14E232E1-73F1-58EE-A435-53B3D46680D4"><p>Key import and export </p> </li>

<li id="GUID-21FCB8AB-8399-50E3-847A-53DF092BBA25"><p>Authenticated execution

of private key operations </p> </li>

</ul> </section>

<section><title>Required background</title> <p>To understand Certificate and

Key Management in detail, you need to have a basic understanding of the following: </p> <ul>

<li id="GUID-1A307F21-3BBF-525D-98B1-3AC2035786EC"><p><xref href="GUID-FB2CAA46-8EBB-5F76-847C-F3B953C9D31C.dita">Public

Key Cryptography</xref>  </p> </li>

<li id="GUID-0EA3DF92-DFE8-5265-97F6-862D5198E9FF"><p><xref href="GUID-911E9F7E-D0AD-55EC-A3F4-1D427F803780.dita">Certificates</xref>  </p> </li>

<li id="GUID-0D2E1131-4C60-56CB-BCDD-432AC5F660F1"><p><xref href="GUID-5C58F7D1-D672-5B6D-AD48-863EC68F7446.dita">Digital

Signatures</xref>  </p> </li>

</ul> </section>

<section><title>Key concepts and terms</title> <dl>

<dlentry>

<dt>Certificate</dt>

<dd><p>A certificate is an electronic document that binds an identity to a

particular public or private key pair. It is commonly used to authenticate

cryptographic public keys. </p> <p>Certificates are issued by a Certification

Authority (CA). They usually include information such as a label, serial number,

validity period, certificate format (for example, X.509) and algorithm type

(for example, MD2RSA). </p> </dd>

</dlentry>

<dlentry>

<dt>Key</dt>

<dd><p>A cryptography key is a constant value applied using a cryptographic

algorithm to encrypt text or to decrypt encrypted text. </p> <p>Keys are classified

as symmetric and asymmetric based on the type of algorithm applied. If the

same key is used for both encryption and decryption, it is symmetric. If different

keys are used for encryption and decryption, they are asymmetric. Asymmetric

keys exist in the form of a public and private key pair, where the public

key is used for encryption and the private key is used for decryption. </p> </dd>

</dlentry>

<dlentry>

<dt>Certificate Store</dt>

<dd><p>A certificate store is a database or a file that stores and manipulates

certificates. </p> <p>The certificate store provides the following functionality: </p> <ul>

<li id="GUID-4FABC2C2-8133-5398-9747-0A247344A52C"><p>Generation, storage

and retrieval certificates </p> </li>

<li id="GUID-F527AAE6-DCDE-5ECC-AB89-1299DC0800A4"><p>Assignment of trust

status to certificates </p> </li>

<li id="GUID-BA60380A-BAC7-59D4-BD7E-5C28ED24921A"><p>Retrieval of list of

applications trusting a certificate </p> </li>

</ul> </dd>

</dlentry>

<dlentry>

<dt>Key Store</dt>

<dd><p>A key store is a repository of keys that can be retrieved and used

to accomplish a variety of tasks. </p> <p>The key store provides the following

functionality: </p> <ul>

<li id="GUID-F5BC1B3C-B400-5392-A68C-ACDB84ABACFC"><p>Generation, import and

export of RSA, DSA, and DH key pairs </p> </li>

<li id="GUID-4A5C1491-C922-5C00-94D6-0E9E05310102"><p>Listing of stored keys </p> </li>

<li id="GUID-1F7B3427-3EB7-5411-A30C-0BB749C1EE73"><p>Authentication of users </p> </li>

<li id="GUID-2DB4F4DF-BB77-5B7F-A724-BBAE21D5B4F4"><p>Private key operations

for authenticated users </p> </li>

</ul> </dd>

</dlentry>

<dlentry>

<dt>Token</dt>

<dd><p>A token is a physical instantiation of an object, such as a certificate

or a key, stored in a phone. Each token belongs to a group of tokens called

a token type. For example, an X.509 certificate is a token which belongs to

the X.509 token type. </p> </dd>

</dlentry>

</dl> </section>

<section><title>Architecture</title> <p>The following diagram shows the basic

architecture of the Certificate and Key Management component. The blocks in

blue are internal to the component. </p> <fig id="GUID-4532D14E-A9FE-595C-8B75-4FA2AE57B8EA">

<image href="GUID-5BB017AA-46AE-5461-9184-98CE7FA898B9_d0e389217_href.jpg" placement="inline"/>

</fig> <p>The various blocks in the basic architecture diagram of the Certificate

and Key Management component are explained as follows: </p> <ul>

<li id="GUID-0FCBBCA0-CD31-51AB-84D1-93994EAC54E2"><p> <b>Client Application</b>:

This is a typical application that accesses the certificates or the keys of

the device through Certificate and Key Management component. </p> <p>For example,

a web browser that wishes to load a bank's web page to perform a money-transfer

operation (in a secured mode using an <codeph>https</codeph> connection) first

checks the device's certificate store for a certificate that trusts the bank's

server and then loads the particular page. </p> </li>

<li id="GUID-B649A55C-7446-56D8-85FB-98AB4879B8CE"><p> <b>Unified Stores</b>:

The <xref href="GUID-39B459CD-8210-59B5-95F4-85CE36676735.dita">Unified Stores</xref> APIs

form the primary access point for client applications to use certificates

or keys stored in the device. The <xref href="GUID-0010EB39-8C23-5453-BE96-4EFC520B6F81.dita">Unified

Certificate Store</xref> provides a unified view of all the certificates in

the device while the <xref href="GUID-695FCEB8-EA04-5C1C-A197-648275BA0281.dita">Unified

Key Store</xref> provides a similar view of all the keys in the device. </p> </li>

<li id="GUID-0A28DE19-3E16-5094-9964-32BE1BF50107"><p> <b>Generic Certificate

and Key Stores</b>: These are the various certificate and key stores in the

device. </p> </li>

<li id="GUID-197709E0-7811-55F1-9EA9-7D80389B3D0A"><p> <b>File-Based Store

Implementation</b>: The certificate and key stores use Symbian's <xref href="GUID-C7150120-74C2-5FF1-99F0-0A267393E342.dita">file-based

store implementation</xref>. Based on the operations to be performed on the

keys and certificates, the file-based implementation updates the physical

certificate and key store files. </p> </li>

</ul> </section>

<section><title>APIs</title> <p>The following table lists the key APIs of

the Certificate and Key Management component. The table lists APIs that perform

the following tasks: </p> <ul>

<li id="GUID-F6DF549D-F1B7-5662-AC36-50453FB56E02"><p>Provide implementation

for certificate and key stores, and for manipulating various types of certificates. </p> </li>

<li id="GUID-47864D9B-97A7-596F-9638-978E236212DE"><p>Perform different types

of ASN.1 (Abstract Syntax Notation One) encoding. </p> </li>

</ul> <table id="GUID-C78DF93D-7684-52FB-BA00-3A060789E26B">

<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>

<thead>

<row>

<entry>API</entry>

<entry>Description</entry>

</row>

</thead>

<tbody>

<row>

<entry><p> <b>Unified Store APIs</b>  </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-AD63C29A-17C3-375C-840F-42A92422300D.dita"><apiname>CUnifiedCertStore</apiname></xref>  </p> </entry>

<entry><p>Provides a common implementation for all certificate stores in the

device. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-818689D6-EB99-382E-A435-D9C6C5D464DE.dita"><apiname>CUnifiedKeyStore</apiname></xref>  </p> </entry>

<entry><p>Provides a common implementation for all key stores in the device. </p> </entry>

</row>

<row>

<entry><p> <b>Certificate APIs</b>  </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-4C645733-8F0C-3AC8-A19E-0AB005F4CE7F.dita"><apiname>CX500DistinguishedName</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for parsing and matching the <xref href="GUID-C93D021E-D99A-5839-AB54-3D8D7620214A.dita">X.500</xref> distinguished

names. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-21954042-44FA-3376-A4C1-D7DE560144C8.dita"><apiname>CX520AttributeTypeAndValue</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for parsing and matching attribute types

and values, as defined by the X.520 standard. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-1309FCDC-229B-36C7-85A9-4540ABC869F9.dita"><apiname>CX509GeneralName</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for manipulation of X.509 certificates. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-A919BE84-8257-3911-9AD1-B1DB736346CE.dita"><apiname>CX509CertChain</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for X.509 certificate chain validation. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-A9B59AEF-C278-3E20-A57B-15293F833A71.dita"><apiname>CX509RSAPublicKey</apiname></xref>  </p> </entry>

<entry><p>Provides APIs for encoding and decoding of RSA public keys. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-9AD19EB1-44D4-339A-A30A-2B43817DB2CB.dita"><apiname>CX509ExtensionBase</apiname></xref>  </p> </entry>

<entry><p>Provides APIs for manipulating various X.509 certificate extensions. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-3E94241B-3B37-3C64-8CFF-7795063160AF.dita"><apiname>CWTLSCertificate</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for construction and manipulation of <xref href="GUID-A636C1B3-8AB2-52D7-BB19-4CC93F4BDD97.dita">WTLS</xref> (Wireless Transport

Layer Security) certificates. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-04C4024C-2987-37F9-8D85-ACCB3D4C1293.dita"><apiname>CWTLSName</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for manipulation of WTLS names. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-A8600958-D424-366C-A56D-68A77949EA28.dita"><apiname>CWTLSRSAPublicKey</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for manipulation of RSA public keys associated

with WTLS certificates. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-56E949D5-EA4F-361C-8523-2965A336B009.dita"><apiname>CWTLSCertChain</apiname></xref>  </p> </entry>

<entry><p>Provides implementation for validation of WTLS certificate chains. </p> </entry>

</row>

<row>

<entry><p> <b>ASN.1 Encoding APIs</b>  </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-1EBCC3C4-3E57-3424-BB41-E74E8120197E.dita"><apiname>CASN1EncBigInt</apiname></xref>  </p> </entry>

<entry><p>Encodes Big Integer objects. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-6B9883C8-9382-3941-A949-3D8E2B7C7EA5.dita"><apiname>CASN1EncBitString</apiname></xref>  </p> </entry>

<entry><p>Encodes bit strings (for example, keys). </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-DE64C76D-D70B-36DC-826C-1662CFBD26D4.dita"><apiname>CASN1EncBoolean</apiname></xref>  </p> </entry>

<entry><p>Encodes Boolean values. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-1E9BA30C-729E-3C49-8DB4-5D693EF2C84E.dita"><apiname>CASN1EncEncoding</apiname></xref>  </p> </entry>

<entry><p>Encapsulates already encoded information. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-964E6C04-4AE0-3085-AF0A-6580264AEF36.dita"><apiname>CASN1EncExplicitTag</apiname></xref>  </p> </entry>

<entry><p>Wraps other encoding objects and provides them with an explicit

tag. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-523EA13D-42F1-31DE-95F2-91AC56C58B62.dita"><apiname>CASN1EncGeneralizedTime</apiname></xref>  </p> </entry>

<entry><p>Encodes time-related objects. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-B4839A2D-E3C1-3405-8776-38A3F5D47FD3.dita"><apiname>CASN1EncInt</apiname></xref>  </p> </entry>

<entry><p>Encodes <codeph>TInt</codeph> objects. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-1ED494A4-503F-3651-946E-E99771348EF6.dita"><apiname>CASN1EncNull</apiname></xref>  </p> </entry>

<entry><p>Encodes NULL values. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-45B0317A-CBB5-369E-877B-C166F9BAE3DF.dita"><apiname>CASN1EncObjectIdentifier</apiname></xref>  </p> </entry>

<entry><p>Encodes object identifiers. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-4170E6D8-A1A5-3E84-B12D-D737CEC0A698.dita"><apiname>CASN1EncOctetString</apiname></xref>  </p> </entry>

<entry><p>Encodes octet strings. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-1B53FA4B-3D36-38AF-97CE-6BA64E9520F3.dita"><apiname>CASN1EncPrimitive</apiname></xref>  </p> </entry>

<entry><p>All ASN.1 primitive type encoding classes derive from this class. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-22AC4FE1-1EB4-341C-9CF8-F153F0346858.dita"><apiname>CASN1EncPrintableString</apiname></xref>  </p> </entry>

<entry><p>Encodes printable strings. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-A0846E03-BC80-3549-B59D-A0F2230E9AC9.dita"><apiname>CASN1EncSequence</apiname></xref>  </p> </entry>

<entry><p>Encodes the <xref href="http://www.asn1.org/books/Explain.html" scope="external">SEQUENCE</xref> and <xref href="http://www.asn1.org/books/Explain.html" scope="external">SEQUENCE-OF</xref> data types. </p> </entry>

</row>

<row>

<entry><p> <xref href="GUID-98D3BDD5-8136-3C66-8381-73E0A8EE910E.dita"><apiname>CASN1EncSet</apiname></xref>  </p> </entry>

<entry><p>Encodes the <xref href="http://www.asn1.org/books/Explain.html" scope="external">SET</xref> and <xref href="http://www.asn1.org/books/Explain.html" scope="external">SET-OF</xref> data types. </p> </entry>

</row>

</tbody>

</tgroup>

</table> </section>

<section><title>Typical uses</title> <p>The Certificate and Key Management

component performs the following tasks: </p> <ul>

<li id="GUID-1C7ED95B-442D-5D05-8E20-95B0F3E17438"><p>Validating certificates

in PKIX </p> </li>

<li id="GUID-8D85F504-F3AB-545E-8FF1-3F6FCEC0D5E8"><p>Adding certificates </p> </li>

<li id="GUID-AC9BF0B0-1A1B-5995-A443-F4E21123CE56"><p>Finding certificates </p> </li>

<li id="GUID-24C041AA-A7BF-5887-B993-E1EA5BA35B66"><p>Managing applicability

and trust settings </p> </li>

<li id="GUID-1FC9F3D9-69C5-56E1-99F6-31B36644B42D"><p>Removing certificates </p> </li>

<li id="GUID-2923D772-0455-5B9A-BD9E-0CC20678A729"><p>Retrieving certificates </p> </li>

<li id="GUID-B1BEDD53-5309-529F-B29A-C42D62ABCC3E"><p>Creating keys </p> </li>

<li id="GUID-46E25298-08E8-560B-9084-5BD38154FA32"><p>Importing keys </p> </li>

<li id="GUID-6FFE5197-8FA0-5760-A068-544CBAB21798"><p>Exporting keys </p> </li>

<li id="GUID-6B1E12DA-6B0C-58F5-8A31-3BF5D2A9D464"><p>Retrieving keys </p> </li>

<li id="GUID-F13A93BD-B5F5-5FD8-A035-817EFD6A2CF6"><p>Deleting keys </p> </li>

<li id="GUID-3BC3D476-6DE9-5DF2-AC9E-7952C87C38DE"><p>Signing keys </p> </li>

<li id="GUID-B9D742CE-C2DE-5930-B3E6-4837B7AC1579"><p>Retrieving key stores </p> </li>

<li id="GUID-0B2B267D-F907-5E0D-BE31-DDB4D06F51D8"><p>Setting and retrieving

authentication policies </p> </li>

<li id="GUID-ED651B05-554A-5B02-BDAF-B61282F7DB4D"><p>Setting use and management

policies </p> </li>

</ul> <p>See <xref href="GUID-B946BDF0-C5D8-57E2-9D05-7BE134AD032E.dita">Unified

Certificate Store Tutorial</xref> and <xref href="GUID-6C6AED40-D5B3-5613-8F92-FD2CB711AE54.dita">Unified

Keystore Tutorials</xref> for details of these tasks. </p> </section>

</conbody><related-links>

<link href="GUID-6F73ED8C-E259-5717-AB84-0C2933A866DA.dita"><linktext>OS Security

Concepts</linktext></link>