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><DIV
CLASS="reference"
><A
NAME="ref.openssl"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
>CXII. OpenSSL Functions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN163262"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.intro"
>简介</A
></H1
><P
> This module uses the functions of <A
HREF="http://www.openssl.org/"
TARGET="_top"
>OpenSSL</A
> for generation and verification
of signatures and for sealing (encrypting) and opening (decrypting)
data. OpenSSL offers many features that this module currently doesn't
support. Some of these may be added in the future.
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.requirements"
>需求</A
></H1
><P
> In order to use the OpenSSL functions you need to install the <A
HREF="http://www.openssl.org/"
TARGET="_top"
>OpenSSL</A
> package.
PHP between versions 4.0.5 and 4.3.1 will work with OpenSSL >= 0.9.5.
Other versions (PHP <=4.0.4 and >= 4.3.2) require OpenSSL >=
0.9.6.
</P
><DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
> You are strongly encouraged to use the most recent OpenSSL version,
otherwise your web server could be vulnerable to attack.
</P
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.installation"
>安装</A
></H1
><P
> To use PHP's OpenSSL support you must also compile PHP <CODE
CLASS="option"
>--with-openssl[=DIR]</CODE
>.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note to Win32 Users: </B
>
In order for this extension to work, there are
<ACRONYM
CLASS="acronym"
>DLL</ACRONYM
> files that must be available to the Windows
system <TT
CLASS="literal"
>PATH</TT
>. See the <ACRONYM
CLASS="acronym"
>FAQ</ACRONYM
> titled "<A
HREF="faq.installation.html#faq.installation.addtopath"
>How do I add my PHP directory to the PATH
on Windows</A
>" for information on how to do this. Although copying DLL
files from the PHP folder into the Windows system directory also works
(because the system directory is by default in the systems
<TT
CLASS="literal"
>PATH</TT
>), it is not recommended.
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>This extension requires the following files to be in the
<TT
CLASS="literal"
>PATH</TT
>:</I
></SPAN
>
<TT
CLASS="filename"
>libeay32.dll</TT
>
</P
><P
><B
>Note to Win32 Users: </B
>
Additionally, if you are planning to use the key generation and certificate
signing functions, you will need to install a valid <TT
CLASS="filename"
>openssl.cnf
</TT
> on your system. As of PHP 4.3.0, we include a sample
configuration file in the <TT
CLASS="filename"
>openssl</TT
>
folder of our win32 binary distribution. If you are using PHP 4.2.0 or
later and are missing the file, you can obtain it from
<A
HREF="http://www.openssl.org/"
TARGET="_top"
>the OpenSSL home page</A
> or by
downloading the PHP 4.3.0 release and using the configuration file from
there.
</P
><P
> PHP will search for the <TT
CLASS="filename"
>openssl.cnf</TT
> using the
following logic:
<P
></P
><UL
><LI
><P
>the <TT
CLASS="literal"
>OPENSSL_CONF</TT
> environmental variable, if
set, will be used as the path (including filename) of the configuration
file.
</P
></LI
><LI
><P
>the <TT
CLASS="literal"
>SSLEAY_CONF</TT
> environmental variable, if
set, will be used as the path (including filename) of the configuration
file.
</P
></LI
><LI
><P
>The file <TT
CLASS="filename"
>openssl.cnf</TT
> will be assumed to be
found in the default certificate area, as configured at the time that
the openssl DLL was compiled. This is usually means that the default
filename is <TT
CLASS="filename"
>c:\usr\local\ssl\openssl.cnf</TT
>.
</P
></LI
></UL
>
</P
><P
> In your installation, you need to decide whether to install the
configuration file at <TT
CLASS="filename"
>c:\usr\local\ssl\openssl.cnf</TT
> or
whether to install it someplace else and use environmental variables
(possibly on a per-virtual-host basis) to locate the configuration file.
Note that it is possible to override the default path from the script using
the <CODE
CLASS="parameter"
>configargs</CODE
> of the functions that require a
configuration file.
</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.configuration"
>运行时配置</A
></H1
><P
>本扩展模块在 <TT
CLASS="filename"
>php.ini</TT
> 中未定义任何配置选项。</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.resources"
>资源类型</A
></H1
><P
> </P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.certparams"
>Key/Certificate parameters</A
></H1
><P
> Quite a few of the openssl functions require a key or a certificate
parameter. PHP 4.0.5 and earlier have to use a key or certificate
<A
HREF="language.types.resource.html"
><B
CLASS="type"
>resource</B
></A
> returned by one of the openssl_get_xxx functions.
Later versions may use one of the following methods:
<P
></P
><UL
><LI
><P
> Certificates
<P
></P
><OL
TYPE="1"
><LI
><P
> An X.509 resource returned from
<A
HREF="function.openssl-x509-read.html"
><B
CLASS="function"
>openssl_x509_read()</B
></A
>
</P
></LI
><LI
><P
>A string having the format
<TT
CLASS="filename"
>file://path/to/cert.pem</TT
>; the named file must
contain a PEM encoded certificate
</P
></LI
><LI
><P
> A string containing the content of a certificate, PEM encoded
</P
></LI
></OL
>
</P
></LI
><LI
><P
> Public/Private Keys
<P
></P
><OL
TYPE="1"
><LI
><P
>A key resource returned from
<A
HREF="function.openssl-get-publickey.html"
><B
CLASS="function"
>openssl_get_publickey()</B
></A
> or
<A
HREF="function.openssl-get-privatekey.html"
><B
CLASS="function"
>openssl_get_privatekey()</B
></A
>
</P
></LI
><LI
><P
>For public keys only: an X.509 resource</P
></LI
><LI
><P
>A string having the format
<TT
CLASS="filename"
>file://path/to/file.pem</TT
> - the named file must
contain a PEM encoded certificate/private key (it may contain both)
</P
></LI
><LI
><P
> A string containing the content of a certificate/key, PEM encoded
</P
></LI
><LI
><P
> For private keys, you may also use the syntax
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>array($key, $passphrase)</I
></SPAN
> where $key represents a
key specified using the file:// or textual content notation above, and
$passphrase represents a string containing the passphrase for that
private key
</P
></LI
></OL
>
</P
></LI
></UL
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.cert.verification"
>Certificate Verification</A
></H1
><P
> When calling a function that will verify a signature/certificate, the
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>cainfo</I
></SPAN
> parameter is an array containing file and
directory names that specify the locations of trusted CA files. If a
directory is specified, then it must be a correctly formed hashed
directory as the <B
CLASS="command"
>openssl</B
> command would use.
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="openssl.constants"
>预定义常量</A
></H1
><P
>以下常量由本扩展模块定义，因此只有在本扩展模块被编译到
PHP 中，或者在运行时被动态加载后才有效。</P
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="openssl.purpose-check"
>Purpose checking flags</A
></H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>X509_PURPOSE_SSL_CLIENT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>X509_PURPOSE_SSL_SERVER</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>X509_PURPOSE_NS_SSL_SERVER</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>X509_PURPOSE_SMIME_SIGN</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>X509_PURPOSE_SMIME_ENCRYPT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>X509_PURPOSE_CRL_SIGN</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>X509_PURPOSE_ANY</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="openssl.padding"
>Padding flags</A
></H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>OPENSSL_PKCS1_PADDING</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_SSLV23_PADDING</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_NO_PADDING</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_PKCS1_OAEP_PADDING</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="openssl.key-types"
>Key types</A
></H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>OPENSSL_KEYTYPE_RSA</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_KEYTYPE_DSA</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_KEYTYPE_DH</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="openssl.pkcs7.flags"
>PKCS7 Flags/Constants</A
></H2
><P
> The S/MIME functions make use of flags which are specified using a
bitfield which can include one or more of the following values:
<DIV
CLASS="table"
><A
NAME="AEN163452"
></A
><P
><B
>表 1. PKCS7 CONSTANTS</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Constant</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
>PKCS7_TEXT</TD
><TD
>Adds text/plain content type headers to encrypted/signed
message. If decrypting or verifying, it strips those headers from
the output - if the decrypted or verified message is not of MIME type
text/plain then an error will occur.</TD
></TR
><TR
><TD
>PKCS7_BINARY</TD
><TD
>Normally the input message is converted to "canonical" format
which is effectively using CR and LF as end of line: as required by
the S/MIME specification. When this options is present, no
translation occurs. This is useful when handling binary data which
may not be in MIME format.</TD
></TR
><TR
><TD
>PKCS7_NOINTERN</TD
><TD
>When verifying a message, certificates (if
any) included in the message are normally searched for the
signing certificate. With this option only the
certificates specified in the <CODE
CLASS="parameter"
>extracerts</CODE
>
parameter of <A
HREF="function.openssl-pkcs7-verify.html"
><B
CLASS="function"
>openssl_pkcs7_verify()</B
></A
> are
used. The supplied certificates can still be used as
untrusted CAs however.
</TD
></TR
><TR
><TD
>PKCS7_NOVERIFY</TD
><TD
>Do not verify the signers certificate of a signed
message.</TD
></TR
><TR
><TD
>PKCS7_NOCHAIN</TD
><TD
>Do not chain verification of signers certificates: that is
don't use the certificates in the signed message as untrusted CAs.
</TD
></TR
><TR
><TD
>PKCS7_NOCERTS</TD
><TD
>When signing a message the signer's certificate is normally
included - with this option it is excluded. This will reduce the
size of the signed message but the verifier must have a copy of the
signers certificate available locally (passed using the
<CODE
CLASS="parameter"
>extracerts</CODE
> to
<A
HREF="function.openssl-pkcs7-verify.html"
><B
CLASS="function"
>openssl_pkcs7_verify()</B
></A
> for example).
</TD
></TR
><TR
><TD
>PKCS7_NOATTR</TD
><TD
>Normally when a message is signed, a set of attributes are
included which include the signing time and the supported symmetric
algorithms. With this option they are not included.
</TD
></TR
><TR
><TD
>PKCS7_DETACHED</TD
><TD
>When signing a message, use cleartext signing with the MIME
type multipart/signed. This is the default
if you do not specify any <CODE
CLASS="parameter"
>flags</CODE
> to
<A
HREF="function.openssl-pkcs7-sign.html"
><B
CLASS="function"
>openssl_pkcs7_sign()</B
></A
>.
If you turn this option off, the message will be signed using
opaque signing, which is more resistant to translation by mail relays
but cannot be read by mail agents that do not support S/MIME.</TD
></TR
><TR
><TD
>PKCS7_NOSIGS</TD
><TD
>Don't try and verify the signatures on a message</TD
></TR
></TBODY
></TABLE
></DIV
>
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>These constants were added in 4.0.6.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="openssl.signature-algos"
>Signature Algorithms</A
></H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>OPENSSL_ALGO_SHA1</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Used as default algorithm by <A
HREF="function.openssl-sign.html"
><B
CLASS="function"
>openssl_sign()</B
></A
> and
<A
HREF="function.openssl-verify.html"
><B
CLASS="function"
>openssl_verify()</B
></A
>.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_ALGO_MD5</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_ALGO_MD4</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_ALGO_MD2</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
></DL
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>These constants were added in 5.0.0.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="openssl.ciphers"
>Ciphers</A
></H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>OPENSSL_CIPHER_RC2_40</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_CIPHER_RC2_128</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_CIPHER_RC2_64</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_CIPHER_DES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_CIPHER_3DES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
></DL
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>These constants were added in 4.3.0.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="openssl.constversion"
>Version constants</A
></H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>OPENSSL_VERSION_TEXT</B
></TT
>
(<A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>OPENSSL_VERSION_NUMBER</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
></DL
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>These constants were added in 5.2.0.</P
></BLOCKQUOTE
></DIV
></DIV
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>目录</B
></DT
><DT
><A
HREF="function.openssl-csr-export-to-file.html"
>openssl_csr_export_to_file</A
> -- Exports a CSR to a file</DT
><DT
><A
HREF="function.openssl-csr-export.html"
>openssl_csr_export</A
> -- Exports a CSR as a string</DT
><DT
><A
HREF="function.openssl-csr-get-public-key.html"
>openssl_csr_get_public_key</A
> -- Returns the public key of a CERT</DT
><DT
><A
HREF="function.openssl-csr-get-subject.html"
>openssl_csr_get_subject</A
> -- Returns the subject of a CERT</DT
><DT
><A
HREF="function.openssl-csr-new.html"
>openssl_csr_new</A
> -- Generates a CSR</DT
><DT
><A
HREF="function.openssl-csr-sign.html"
>openssl_csr_sign</A
> -- Sign a CSR with another certificate (or itself) and generate a certificate</DT
><DT
><A
HREF="function.openssl-error-string.html"
>openssl_error_string</A
> -- Return openSSL error message</DT
><DT
><A
HREF="function.openssl-free-key.html"
>openssl_free_key</A
> -- Free key resource</DT
><DT
><A
HREF="function.openssl-get-privatekey.html"
>openssl_get_privatekey</A
> -- 别名 <A
HREF="function.openssl-pkey-get-private.html"
><B
CLASS="function"
>openssl_pkey_get_private()</B
></A
></DT
><DT
><A
HREF="function.openssl-get-publickey.html"
>openssl_get_publickey</A
> -- 别名 <A
HREF="function.openssl-pkey-get-public.html"
><B
CLASS="function"
>openssl_pkey_get_public()</B
></A
></DT
><DT
><A
HREF="function.openssl-open.html"
>openssl_open</A
> -- Open sealed data</DT
><DT
><A
HREF="function.openssl-pkcs7-decrypt.html"
>openssl_pkcs7_decrypt</A
> -- Decrypts an S/MIME encrypted message</DT
><DT
><A
HREF="function.openssl-pkcs7-encrypt.html"
>openssl_pkcs7_encrypt</A
> -- Encrypt an S/MIME message</DT
><DT
><A
HREF="function.openssl-pkcs7-sign.html"
>openssl_pkcs7_sign</A
> -- Sign an S/MIME message</DT
><DT
><A
HREF="function.openssl-pkcs7-verify.html"
>openssl_pkcs7_verify</A
> -- Verifies the signature of an S/MIME signed message</DT
><DT
><A
HREF="function.openssl-pkey-export-to-file.html"
>openssl_pkey_export_to_file</A
> -- Gets an exportable representation of a key into a file </DT
><DT
><A
HREF="function.openssl-pkey-export.html"
>openssl_pkey_export</A
> -- Gets an exportable representation of a key into a string</DT
><DT
><A
HREF="function.openssl-pkey-free.html"
>openssl_pkey_free</A
> -- Frees a private key</DT
><DT
><A
HREF="function.openssl-pkey-get-details.html"
>openssl_pkey_get_details</A
> -- Returns an array with the key details (bits, pkey, type)</DT
><DT
><A
HREF="function.openssl-pkey-get-private.html"
>openssl_pkey_get_private</A
> -- Get a private key</DT
><DT
><A
HREF="function.openssl-pkey-get-public.html"
>openssl_pkey_get_public</A
> -- Extract public key from certificate and prepare it for use</DT
><DT
><A
HREF="function.openssl-pkey-new.html"
>openssl_pkey_new</A
> -- Generates a new private key </DT
><DT
><A
HREF="function.openssl-private-decrypt.html"
>openssl_private_decrypt</A
> -- Decrypts data with private key </DT
><DT
><A
HREF="function.openssl-private-encrypt.html"
>openssl_private_encrypt</A
> -- Encrypts data with private key </DT
><DT
><A
HREF="function.openssl-public-decrypt.html"
>openssl_public_decrypt</A
> -- Decrypts data with public key </DT
><DT
><A
HREF="function.openssl-public-encrypt.html"
>openssl_public_encrypt</A
> -- Encrypts data with public key </DT
><DT
><A
HREF="function.openssl-seal.html"
>openssl_seal</A
> -- Seal (encrypt) data</DT
><DT
><A
HREF="function.openssl-sign.html"
>openssl_sign</A
> -- Generate signature</DT
><DT
><A
HREF="function.openssl-verify.html"
>openssl_verify</A
> -- Verify signature</DT
><DT
><A
HREF="function.openssl-x509-check-private-key.html"
>openssl_x509_check_private_key</A
> -- Checks if a private key corresponds to a certificate</DT
><DT
><A
HREF="function.openssl-x509-checkpurpose.html"
>openssl_x509_checkpurpose</A
> -- Verifies if a certificate can be used for a particular
purpose</DT
><DT
><A
HREF="function.openssl-x509-export-to-file.html"
>openssl_x509_export_to_file</A
> -- Exports a certificate to file</DT
><DT
><A
HREF="function.openssl-x509-export.html"
>openssl_x509_export</A
> -- Exports a certificate as a string</DT
><DT
><A
HREF="function.openssl-x509-free.html"
>openssl_x509_free</A
> -- Free certificate resource</DT
><DT
><A
HREF="function.openssl-x509-parse.html"
>openssl_x509_parse</A
> -- Parse an X509 certificate and return the information as an
array</DT
><DT
><A
HREF="function.openssl-x509-read.html"
>openssl_x509_read</A
> -- Parse an X.509 certificate and return a resource identifier for
it</DT
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