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.highlight .na { color: #336699 } /* Name.Attribute */
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.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
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.highlight .nd { color: #555555 } /* Name.Decorator */
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.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
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.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
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.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span><span class="k">if</span> PACKAGE_libopenssl

<span class="k">comment</span> <span class="s2">&quot;Build Options&quot;</span>

<span class="k">config</span> OPENSSL_OPTIMIZE_SPEED
	<span class="nb">bool</span>
	<span class="k">default</span> y <span class="k">if</span> x86_64 <span class="o">||</span> i386
	<span class="k">prompt</span> <span class="s2">&quot;Enable optimization for speed instead of size&quot;</span>
	<span class="k">select</span> OPENSSL_WITH_ASM
	<span class="k">help</span>
<span class="sd">		Enabling this option increases code size (around 20%) and</span>
<span class="sd">		performance.  The increase in performance and size depends on the</span>
<span class="sd">		target CPU. EC and AES seem to benefit the most, with EC speed</span>
<span class="sd">		increased by 20%-50% (mipsel &amp; x86).</span>
<span class="sd">		AES-GCM is supposed to be 3x faster on x86. YMMV.</span>

<span class="k">config</span> OPENSSL_WITH_ASM
	<span class="nb">bool</span>
	<span class="k">default</span> y <span class="k">if</span> <span class="o">!</span>SMALL_FLASH <span class="o">||</span> <span class="o">!</span>arm
	<span class="k">prompt</span> <span class="s2">&quot;Compile with optimized assembly code&quot;</span>
	<span class="k">depends on</span> <span class="o">!</span>arc
	<span class="k">help</span>
<span class="sd">		Disabling this option will reduce code size and performance.</span>
<span class="sd">		The increase in performance and size depends on the target</span>
<span class="sd">		CPU and on the algorithms being optimized.  As of 1.1.0i*:</span>

<span class="sd">		Platform  Pkg Inc. Algorithms where assembly is used - ~% Speed Increase</span>
<span class="sd">		aarch64   174K     BN, aes, sha1, sha256, sha512, nist256, poly1305</span>
<span class="sd">		arm       152K     BN, aes, sha1, sha256, sha512, nist256, poly1305</span>
<span class="sd">		i386      183K     BN+147%, aes+300%, rc4+55%, sha1+160%, sha256+114%, sha512+270%, nist256+282%, poly1305+292%</span>
<span class="sd">		mipsel      1.5K   BN+97%, aes+4%, sha1+94%, sha256+60%</span>
<span class="sd">		mips64	    3.7K   BN, aes, sha1, sha256, sha512, poly1305</span>
<span class="sd">		powerpc    20K     BN, aes, sha1, sha256, sha512, poly1305</span>
<span class="sd">		x86_64    228K     BN+220%, aes+173%, rc4+38%, sha1+40%, sha256+64%, sha512+31%, nist256+354%, poly1305+228%</span>

<span class="sd">		* Only most common algorithms shown. Your mileage may vary.</span>
<span class="sd">		  BN (bignum) performance was measured using RSA sign/verify.</span>

<span class="k">config</span> OPENSSL_WITH_SSE2
	<span class="nb">bool</span>
	<span class="k">default</span> y <span class="k">if</span> <span class="o">!</span>TARGET_x86_legacy <span class="o">&amp;&amp;</span> <span class="o">!</span>TARGET_x86_geode
	<span class="k">prompt</span> <span class="s2">&quot;Enable use of x86 SSE2 instructions&quot;</span>
	<span class="k">depends on</span> OPENSSL_WITH_ASM <span class="o">&amp;&amp;</span> i386
	<span class="k">help</span>
<span class="sd">		Use of SSE2 instructions greatly increase performance (up to</span>
<span class="sd">		3x faster) with a minimum (~0.2%, or 23KB) increase in package</span>
<span class="sd">		size, but it will bring no benefit if your hardware does not</span>
<span class="sd">		support them, such as Geode GX and LX.  In this case you may</span>
<span class="sd">		save 23KB by saying yes here.  AMD Geode NX, and Intel</span>
<span class="sd">		Pentium 4 and above support SSE2.</span>

<span class="k">config</span> OPENSSL_WITH_DEPRECATED
	<span class="nb">bool</span>
	<span class="k">default</span> y
	<span class="k">prompt</span> <span class="s2">&quot;Include deprecated APIs (See help for a list of packages that need this)&quot;</span>
	<span class="k">help</span>
<span class="sd">		Since openssl 1.1.x is still new to openwrt, some packages</span>
<span class="sd">		requiring this option do not list it as a requirement yet:</span>
<span class="sd">		 * freeswitch-stable, freeswitch, python, python3, squid.</span>

<span class="k">config</span> OPENSSL_NO_DEPRECATED
	<span class="nb">bool</span>
	<span class="k">default</span> <span class="o">!</span>OPENSSL_WITH_DEPRECATED

<span class="k">config</span> OPENSSL_WITH_ERROR_MESSAGES
	<span class="nb">bool</span>
	<span class="k">default</span> y <span class="k">if</span> <span class="o">!</span>SMALL_FLASH <span class="o">&amp;&amp;</span> <span class="o">!</span>LOW_MEMORY_FOOTPRINT
	<span class="k">prompt</span> <span class="s2">&quot;Include error messages&quot;</span>
	<span class="k">help</span>
<span class="sd">		This option aids debugging, but increases package size and</span>
<span class="sd">		memory usage.</span>

<span class="k">comment</span> <span class="s2">&quot;Protocol Support&quot;</span>

<span class="k">config</span> OPENSSL_WITH_TLS13
	<span class="nb">bool</span>
	<span class="k">default</span> y
	<span class="k">prompt</span> <span class="s2">&quot;Enable support for TLS 1.3&quot;</span>
	<span class="k">help</span>
<span class="sd">		TLS 1.3 is the newest version of the TLS specification.</span>
<span class="sd">		It aims:</span>
<span class="sd">		 * to increase the overall security of the protocol,</span>
<span class="sd">		   removing outdated algorithms, and encrypting more of the</span>
<span class="sd">		   protocol;</span>
<span class="sd">		 * to increase performance by reducing the number of round-trips</span>
<span class="sd">		   when performing a full handshake.</span>
<span class="sd">		It increases package size by ~4KB.</span>

<span class="k">config</span> OPENSSL_WITH_DTLS
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable DTLS support&quot;</span>
	<span class="k">help</span>
<span class="sd">		Datagram Transport Layer Security (DTLS) provides TLS-like security</span>
<span class="sd">		for datagram-based (UDP, DCCP, CAPWAP, SCTP &amp; SRTP) applications.</span>

<span class="k">config</span> OPENSSL_WITH_NPN
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable NPN support&quot;</span>
	<span class="k">help</span>
<span class="sd">		NPN is a TLS extension, obsoleted and replaced with ALPN,</span>
<span class="sd">		used to negotiate SPDY, and HTTP/2.</span>

<span class="k">config</span> OPENSSL_WITH_SRP
	<span class="nb">bool</span>
	<span class="k">default</span> y
	<span class="k">prompt</span> <span class="s2">&quot;Enable SRP support&quot;</span>
	<span class="k">help</span>
<span class="sd">		The Secure Remote Password protocol (SRP) is an augmented</span>
<span class="sd">		password-authenticated key agreement (PAKE) protocol, specifically</span>
<span class="sd">		designed to work around existing patents.</span>

<span class="k">config</span> OPENSSL_WITH_CMS
	<span class="nb">bool</span>
	<span class="k">default</span> y
	<span class="k">prompt</span> <span class="s2">&quot;Enable CMS (RFC 5652) support&quot;</span>
	<span class="k">help</span>
<span class="sd">		Cryptographic Message Syntax (CMS) is used to digitally sign,</span>
<span class="sd">		digest, authenticate, or encrypt arbitrary message content.</span>

<span class="k">comment</span> <span class="s2">&quot;Algorithm Selection&quot;</span>

<span class="k">config</span> OPENSSL_WITH_EC2M
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable ec2m support&quot;</span>
	<span class="k">help</span>
<span class="sd">		This option enables the more efficient, yet less common, binary</span>
<span class="sd">		field elliptic curves.</span>

<span class="k">config</span> OPENSSL_WITH_CHACHA_POLY1305
	<span class="nb">bool</span>
	<span class="k">default</span> y
	<span class="k">prompt</span> <span class="s2">&quot;Enable ChaCha20-Poly1305 ciphersuite support&quot;</span>
	<span class="k">help</span>
<span class="sd">		ChaCha20-Poly1305 is an AEAD ciphersuite with 256-bit keys,</span>
<span class="sd">		combining ChaCha stream cipher with Poly1305 MAC.</span>
<span class="sd">		It is 3x faster than AES, when not using a CPU with AES-specific</span>
<span class="sd">		instructions, as is the case of most embedded devices.</span>

<span class="k">config</span> OPENSSL_PREFER_CHACHA_OVER_GCM
	<span class="nb">bool</span>
	<span class="k">default</span> y <span class="k">if</span> <span class="o">!</span>x86_64 <span class="o">&amp;&amp;</span> <span class="o">!</span>aarch64
	<span class="k">prompt</span> <span class="s2">&quot;Prefer ChaCha20-Poly1305 over AES-GCM by default&quot;</span>
	<span class="k">depends on</span> OPENSSL_WITH_CHACHA_POLY1305
	<span class="k">help</span>
<span class="sd">		The default openssl preference is for AES-GCM before ChaCha, but</span>
<span class="sd">		that takes into account AES-NI capable chips.  It is not the</span>
<span class="sd">		case with most embedded chips, so it may be better to invert</span>
<span class="sd">		that preference.  This is just for the default case. The</span>
<span class="sd">		application can always override this.</span>

<span class="k">config</span> OPENSSL_WITH_PSK
	<span class="nb">bool</span>
	<span class="k">default</span> y
	<span class="k">prompt</span> <span class="s2">&quot;Enable PSK support&quot;</span>
	<span class="k">help</span>
<span class="sd">		Build support for Pre-Shared Key based cipher suites.</span>

<span class="k">comment</span> <span class="s2">&quot;Less commonly used build options&quot;</span>

<span class="k">config</span> OPENSSL_WITH_ARIA
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable ARIA support&quot;</span>
	<span class="k">help</span>
<span class="sd">		ARIA is a block cipher developed in South Korea, based on AES.</span>

<span class="k">config</span> OPENSSL_WITH_CAMELLIA
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable Camellia cipher support&quot;</span>
	<span class="k">help</span>
<span class="sd">		Camellia is a bock cipher with security levels and processing</span>
<span class="sd">		abilities comparable to AES.</span>

<span class="k">config</span> OPENSSL_WITH_IDEA
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable IDEA cipher support&quot;</span>
	<span class="k">help</span>
<span class="sd">		IDEA is a block cipher with 128-bit keys.</span>

<span class="k">config</span> OPENSSL_WITH_SEED
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable SEED cipher support&quot;</span>
	<span class="k">help</span>
<span class="sd">		SEED is a block cipher with 128-bit keys broadly used in</span>
<span class="sd">		South Korea, but seldom found elsewhere.</span>

<span class="k">config</span> OPENSSL_WITH_SM234
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable SM2/3/4 algorithms support&quot;</span>
	<span class="k">help</span>
<span class="sd">		These algorithms are a set of &quot;Commercial Cryptography&quot;</span>
<span class="sd">		algorithms approved for use in China.</span>
<span class="sd">		  * SM2 is an EC algorithm equivalent to ECDSA P-256</span>
<span class="sd">		  * SM3 is a hash function equivalent to SHA-256</span>
<span class="sd">		  * SM4 is a 128-block cipher equivalent to AES-128</span>

<span class="k">config</span> OPENSSL_WITH_BLAKE2
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable BLAKE2 digest support&quot;</span>
	<span class="k">help</span>
<span class="sd">		BLAKE2 is a cryptographic hash function based on the ChaCha</span>
<span class="sd">		stream cipher.</span>

<span class="k">config</span> OPENSSL_WITH_MDC2
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable MDC2 digest support&quot;</span>

<span class="k">config</span> OPENSSL_WITH_WHIRLPOOL
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable Whirlpool digest support&quot;</span>

<span class="k">config</span> OPENSSL_WITH_COMPRESSION
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable compression support&quot;</span>
	<span class="k">help</span>
<span class="sd">		TLS compression is not recommended, as it is deemed insecure.</span>
<span class="sd">		The CRIME attack exploits this weakness.</span>
<span class="sd">		Even with this option turned on, it is disabled by default, and the</span>
<span class="sd">		application must explicitly turn it on.</span>

<span class="k">config</span> OPENSSL_WITH_RFC3779
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable RFC3779 support (BGP)&quot;</span>
	<span class="k">help</span>
<span class="sd">		RFC 3779 defines two X.509 v3 certificate extensions.  The first</span>
<span class="sd">		binds a list of IP address blocks, or prefixes, to the subject of a</span>
<span class="sd">		certificate.  The second binds a list of autonomous system</span>
<span class="sd">		identifiers to the subject of a certificate.  These extensions may be</span>
<span class="sd">		used to convey the authorization of the subject to use the IP</span>
<span class="sd">		addresses and autonomous system identifiers contained in the</span>
<span class="sd">		extensions.</span>

<span class="k">comment</span> <span class="s2">&quot;Engine/Hardware Support&quot;</span>

<span class="k">config</span> OPENSSL_ENGINE
	<span class="nb">bool</span> <span class="s2">&quot;Enable engine support&quot;</span>
	<span class="k">default</span> y
	<span class="k">help</span>
<span class="sd">		This enables alternative cryptography implementations,</span>
<span class="sd">		most commonly for interfacing with external crypto devices,</span>
<span class="sd">		or supporting new/alternative ciphers and digests.</span>
<span class="sd">		If you compile the library with this option disabled, packages built</span>
<span class="sd">		using an engine-enabled library (i.e. from the official repo) may</span>
<span class="sd">		fail to run.  Compile and install the packages with engine support</span>
<span class="sd">		disabled, and you should be fine.</span>
<span class="sd">		Note that you need to enable KERNEL_AIO to be able to build the</span>
<span class="sd">		afalg engine package.</span>

<span class="k">config</span> OPENSSL_ENGINE_BUILTIN
	<span class="nb">bool</span> <span class="s2">&quot;Build chosen engines into libcrypto&quot;</span>
	<span class="k">depends on</span> OPENSSL_ENGINE
	<span class="k">help</span>
<span class="sd">		This builds all chosen engines into libcrypto.so, instead of building</span>
<span class="sd">		them as dynamic engines in separate packages.</span>
<span class="sd">		The benefit of building the engines into libcrypto is that they won&#39;t</span>
<span class="sd">		require any configuration to be used by default.</span>

<span class="k">config</span> OPENSSL_ENGINE_BUILTIN_AFALG
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Acceleration support through AF_ALG sockets engine&quot;</span>
	<span class="k">depends on</span> OPENSSL_ENGINE_BUILTIN <span class="o">&amp;&amp;</span> KERNEL_AIO
	<span class="k">select</span> PACKAGE_libopenssl-conf
	<span class="k">help</span>
<span class="sd">		This enables use of hardware acceleration through the</span>
<span class="sd">		AF_ALG kernel interface.</span>

<span class="k">config</span> OPENSSL_ENGINE_BUILTIN_DEVCRYPTO
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Acceleration support through /dev/crypto&quot;</span>
	<span class="k">depends on</span> OPENSSL_ENGINE_BUILTIN
	<span class="k">select</span> PACKAGE_libopenssl-conf
	<span class="k">help</span>
<span class="sd">		This enables use of hardware acceleration through OpenBSD</span>
<span class="sd">		Cryptodev API (/dev/crypto) interface.</span>
<span class="sd">		Even though configuration is not strictly needed, it is worth seeing</span>
<span class="sd">		https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators</span>
<span class="sd">		for information on how to configure the engine.</span>

<span class="k">config</span> OPENSSL_ENGINE_BUILTIN_PADLOCK
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;VIA Padlock Acceleration support engine&quot;</span>
	<span class="k">depends on</span> OPENSSL_ENGINE_BUILTIN <span class="o">&amp;&amp;</span> TARGET_x86
	<span class="k">select</span> PACKAGE_libopenssl-conf
	<span class="k">help</span>
<span class="sd">		This enables use of hardware acceleration through the</span>
<span class="sd">		VIA Padlock module.</span>

<span class="k">config</span> OPENSSL_WITH_ASYNC
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Enable asynchronous jobs support&quot;</span>
	<span class="k">depends on</span> OPENSSL_ENGINE <span class="o">&amp;&amp;</span> USE_GLIBC
	<span class="k">help</span>
<span class="sd">		Enables async-aware applications to be able to use OpenSSL to</span>
<span class="sd">		initiate crypto operations asynchronously. In order to work</span>
<span class="sd">		this will require the presence of an async capable engine.</span>

<span class="k">config</span> OPENSSL_WITH_GOST
	<span class="nb">bool</span>
	<span class="k">prompt</span> <span class="s2">&quot;Prepare library for GOST engine&quot;</span>
	<span class="k">depends on</span> OPENSSL_ENGINE
	<span class="k">help</span>
<span class="sd">		This option prepares the library to accept engine support</span>
<span class="sd">		for Russian GOST crypto algorithms.</span>
<span class="sd">		The gost engine is not included in standard openwrt feeds.</span>
<span class="sd">		To build such engine yourself, see:</span>
<span class="sd">		https://github.com/gost-engine/engine</span>

<span class="k">endif</span>
</pre></div>
</code></pre></td></tr></table>
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