if PACKAGE_libopenssl comment "Build Options" config OPENSSL_OPTIMIZE_SPEED bool default y if x86_64 || i386 prompt "Enable optimization for speed instead of size" select OPENSSL_WITH_ASM help Enabling this option increases code size and performance. The increase in performance and size depends on the target CPU. EC and AES seem to benefit the most. config OPENSSL_SMALL_FOOTPRINT bool depends on !OPENSSL_OPTIMIZE_SPEED default y if SMALL_FLASH || LOW_MEMORY_FOOTPRINT prompt "Build with OPENSSL_SMALL_FOOTPRINT (read help)" help This turns on -DOPENSSL_SMALL_FOOTPRINT. This will save only 1-3% of of the ipk size. The performance drop depends on architecture and algorithm. MIPS drops 13% of performance for a 3% decrease in ipk size. On Aarch64, for a 1% reduction in size, ghash and GCM performance decreases 90%, while Chacha20-Poly1305 is 15% slower. X86_64 drops 1% of its size for 3% of performance. Other arches have not been tested. config OPENSSL_WITH_ASM bool default y prompt "Compile with optimized assembly code" depends on !arc help Disabling this option will reduce code size and performance. The increase in performance and size depends on the target CPU and on the algorithms being optimized. config OPENSSL_WITH_SSE2 bool default y if !TARGET_x86_legacy && !TARGET_x86_geode prompt "Enable use of x86 SSE2 instructions" depends on OPENSSL_WITH_ASM && i386 help Use of SSE2 instructions greatly increase performance with a minimum increase in package size, but it will bring no benefit if your hardware does not support them, such as Geode GX and LX. AMD Geode NX, and Intel Pentium 4 and above support SSE2. config OPENSSL_WITH_DEPRECATED bool default y prompt "Include deprecated APIs" help This drops all deprecated API, including engine support. config OPENSSL_NO_DEPRECATED bool default !OPENSSL_WITH_DEPRECATED config OPENSSL_WITH_ERROR_MESSAGES bool default y if !OPENSSL_SMALL_FOOTPRINT || (!SMALL_FLASH && !LOW_MEMORY_FOOTPRINT) prompt "Include error messages" help This option aids debugging, but increases package size and memory usage. comment "Protocol Support" config OPENSSL_WITH_TLS13 bool default y prompt "Enable support for TLS 1.3" help TLS 1.3 is the newest version of the TLS specification. It aims: * to increase the overall security of the protocol, removing outdated algorithms, and encrypting more of the protocol; * to increase performance by reducing the number of round-trips when performing a full handshake. config OPENSSL_WITH_DTLS bool prompt "Enable DTLS support" help Datagram Transport Layer Security (DTLS) provides TLS-like security for datagram-based (UDP, DCCP, CAPWAP, SCTP & SRTP) applications. config OPENSSL_WITH_NPN bool prompt "Enable NPN support" help NPN is a TLS extension, obsoleted and replaced with ALPN, used to negotiate SPDY, and HTTP/2. config OPENSSL_WITH_SRP bool default y prompt "Enable SRP support" help The Secure Remote Password protocol (SRP) is an augmented password-authenticated key agreement (PAKE) protocol, specifically designed to work around existing patents. config OPENSSL_WITH_CMS bool default y prompt "Enable CMS (RFC 5652) support" help Cryptographic Message Syntax (CMS) is used to digitally sign, digest, authenticate, or encrypt arbitrary message content. comment "Algorithm Selection" config OPENSSL_WITH_EC2M bool prompt "Enable ec2m support" help This option enables the more efficient, yet less common, binary field elliptic curves. config OPENSSL_WITH_CHACHA_POLY1305 bool default y prompt "Enable ChaCha20-Poly1305 ciphersuite support" help ChaCha20-Poly1305 is an AEAD ciphersuite with 256-bit keys, combining ChaCha stream cipher with Poly1305 MAC. It is 3x faster than AES, when not using a CPU with AES-specific instructions, as is the case of most embedded devices. config OPENSSL_PREFER_CHACHA_OVER_GCM bool default y if !x86_64 && !aarch64 prompt "Prefer ChaCha20-Poly1305 over AES-GCM by default" depends on OPENSSL_WITH_CHACHA_POLY1305 help The default openssl preference is for AES-GCM before ChaCha, but that takes into account AES-NI capable chips. It is not the case with most embedded chips, so it may be better to invert that preference. This is just for the default case. The application can always override this. config OPENSSL_WITH_PSK bool default y prompt "Enable PSK support" help Build support for Pre-Shared Key based cipher suites. comment "Less commonly used build options" config OPENSSL_WITH_ARIA bool prompt "Enable ARIA support" help ARIA is a block cipher developed in South Korea, based on AES. config OPENSSL_WITH_CAMELLIA bool prompt "Enable Camellia cipher support" help Camellia is a bock cipher with security levels and processing abilities comparable to AES. config OPENSSL_WITH_IDEA bool default y if !SMALL_FLASH prompt "Enable IDEA cipher support (needs legacy provider)" help IDEA is a block cipher with 128-bit keys. To use the cipher, one must install the libopenssl-legacy package, using a main libopenssl package compiled with this option enabled as well. config OPENSSL_WITH_SEED bool default y if !SMALL_FLASH prompt "Enable SEED cipher support (needs legacy provider)" help SEED is a block cipher with 128-bit keys broadly used in South Korea, but seldom found elsewhere. To use the cipher, one must install the libopenssl-legacy package, using a main libopenssl package compiled with this option enabled as well. config OPENSSL_WITH_SM234 bool prompt "Enable SM2/3/4 algorithms support" help These algorithms are a set of "Commercial Cryptography" algorithms approved for use in China. * SM2 is an EC algorithm equivalent to ECDSA P-256 * SM3 is a hash function equivalent to SHA-256 * SM4 is a 128-block cipher equivalent to AES-128 config OPENSSL_WITH_BLAKE2 bool prompt "Enable BLAKE2 digest support" help BLAKE2 is a cryptographic hash function based on the ChaCha stream cipher. config OPENSSL_WITH_MDC2 bool default y if !SMALL_FLASH prompt "Enable MDC2 digest support (needs legacy provider)" help To use the digest, one must install the libopenssl-legacy package, using a main libopenssl package compiled with this option enabled as well. config OPENSSL_WITH_WHIRLPOOL bool default y if !SMALL_FLASH prompt "Enable Whirlpool digest support (needs legacy provider)" help To use the digest, one must install the libopenssl-legacy package, using a main libopenssl package compiled with this option enabled as well. config OPENSSL_WITH_COMPRESSION bool prompt "Enable compression support" help TLS compression is not recommended, as it is deemed insecure. The CRIME attack exploits this weakness. Even with this option turned on, it is disabled by default, and the application must explicitly turn it on. config OPENSSL_WITH_RFC3779 bool prompt "Enable RFC3779 support (BGP)" help RFC 3779 defines two X.509 v3 certificate extensions. The first binds a list of IP address blocks, or prefixes, to the subject of a certificate. The second binds a list of autonomous system identifiers to the subject of a certificate. These extensions may be used to convey the authorization of the subject to use the IP addresses and autonomous system identifiers contained in the extensions. comment "Engine/Hardware Support" config OPENSSL_ENGINE bool "Enable engine support" select OPENSSL_WITH_DEPRECATED default y help This enables alternative cryptography implementations, most commonly for interfacing with external crypto devices, or supporting new/alternative ciphers and digests. If you compile the library with this option disabled, packages built using an engine-enabled library (i.e. from the official repo) may fail to run. Compile and install the packages with engine support disabled, and you should be fine. Note that you need to enable KERNEL_AIO to be able to build the afalg engine package. config OPENSSL_ENGINE_BUILTIN bool "Build chosen engines into libcrypto" depends on OPENSSL_ENGINE help This builds all chosen engines into libcrypto.so, instead of building them as dynamic engines in separate packages. The benefit of building the engines into libcrypto is that they won't require any configuration to be used by default. config OPENSSL_ENGINE_BUILTIN_AFALG bool prompt "Acceleration support through AF_ALG sockets engine" depends on OPENSSL_ENGINE_BUILTIN && KERNEL_AIO select PACKAGE_libopenssl-conf help This enables use of hardware acceleration through the AF_ALG kernel interface. config OPENSSL_ENGINE_BUILTIN_DEVCRYPTO bool prompt "Acceleration support through /dev/crypto" depends on OPENSSL_ENGINE_BUILTIN select PACKAGE_libopenssl-conf help This enables use of hardware acceleration through OpenBSD Cryptodev API (/dev/crypto) interface. Even though configuration is not strictly needed, it is worth seeing https://openwrt.org/docs/techref/hardware/cryptographic.hardware.accelerators for information on how to configure the engine. config OPENSSL_ENGINE_BUILTIN_PADLOCK bool prompt "VIA Padlock Acceleration support engine" depends on OPENSSL_ENGINE_BUILTIN && TARGET_x86 select PACKAGE_libopenssl-conf help This enables use of hardware acceleration through the VIA Padlock module. config OPENSSL_WITH_ASYNC bool prompt "Enable asynchronous jobs support" depends on OPENSSL_ENGINE && USE_GLIBC help Enables async-aware applications to be able to use OpenSSL to initiate crypto operations asynchronously. In order to work this will require the presence of an async capable engine. endif