OpenWrt – Rev 4
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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 (around 20%) and
performance. The increase in performance and size depends on the
target CPU. EC and AES seem to benefit the most, with EC speed
increased by 20%-50% (mipsel & x86).
AES-GCM is supposed to be 3x faster on x86. YMMV.
config OPENSSL_WITH_ASM
bool
default y if !SMALL_FLASH || !arm
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. As of 1.1.0i*:
Platform Pkg Inc. Algorithms where assembly is used - ~% Speed Increase
aarch64 174K BN, aes, sha1, sha256, sha512, nist256, poly1305
arm 152K BN, aes, sha1, sha256, sha512, nist256, poly1305
i386 183K BN+147%, aes+300%, rc4+55%, sha1+160%, sha256+114%, sha512+270%, nist256+282%, poly1305+292%
mipsel 1.5K BN+97%, aes+4%, sha1+94%, sha256+60%
mips64 3.7K BN, aes, sha1, sha256, sha512, poly1305
powerpc 20K BN, aes, sha1, sha256, sha512, poly1305
x86_64 228K BN+220%, aes+173%, rc4+38%, sha1+40%, sha256+64%, sha512+31%, nist256+354%, poly1305+228%
* Only most common algorithms shown. Your mileage may vary.
BN (bignum) performance was measured using RSA sign/verify.
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 (up to
3x faster) with a minimum (~0.2%, or 23KB) increase in package
size, but it will bring no benefit if your hardware does not
support them, such as Geode GX and LX. In this case you may
save 23KB by saying yes here. AMD Geode NX, and Intel
Pentium 4 and above support SSE2.
config OPENSSL_WITH_DEPRECATED
bool
default y
prompt "Include deprecated APIs (See help for a list of packages that need this)"
help
Since openssl 1.1.x is still new to openwrt, some packages
requiring this option do not list it as a requirement yet:
* freeswitch-stable, freeswitch, python, python3, squid.
config OPENSSL_NO_DEPRECATED
bool
default !OPENSSL_WITH_DEPRECATED
config OPENSSL_WITH_ERROR_MESSAGES
bool
default y if !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"
select OPENSSL_WITH_EC
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.
It increases package size by ~4KB.
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
default y
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_EC
bool
default y
prompt "Enable elliptic curve support"
help
Elliptic-curve cryptography (ECC) is an approach to public-key
cryptography based on the algebraic structure of elliptic curves
over finite fields. ECC requires smaller keys compared to non-ECC
cryptography to provide equivalent security.
config OPENSSL_WITH_EC2M
bool
depends on OPENSSL_WITH_EC
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
prompt "Enable IDEA cipher support"
help
IDEA is a block cipher with 128-bit keys.
config OPENSSL_WITH_SEED
bool
prompt "Enable SEED cipher support"
help
SEED is a block cipher with 128-bit keys broadly used in
South Korea, but seldom found elsewhere.
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
prompt "Enable MDC2 digest support"
config OPENSSL_WITH_WHIRLPOOL
bool
prompt "Enable Whirlpool digest support"
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"
help
This enables alternative cryptography implementations,
most commonly for interfacing with external crypto devices,
or supporting new/alternative ciphers and digests.
Note that you need to enable KERNEL_AIO to be able to build the
afalg engine package.
config OPENSSL_ENGINE_CRYPTO
bool
select OPENSSL_ENGINE
select PACKAGE_kmod-cryptodev
select PACKAGE_libopenssl-conf
prompt "Acceleration support through /dev/crypto"
help
This enables use of hardware acceleration through OpenBSD
Cryptodev API (/dev/crypto) interface.
You must install kmod-cryptodev (under Kernel modules, Cryptographic
API modules) for /dev/crypto to show up and use hardware
acceleration; otherwise it falls back to software.
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.
config OPENSSL_WITH_GOST
bool
prompt "Prepare library for GOST engine"
depends on OPENSSL_ENGINE
help
This option prepares the library to accept engine support
for Russian GOST crypto algorithms.
The gost engine is not included in standard openwrt feeds.
To build such engine yourself, see:
https://github.com/gost-engine/engine
endif