mt7628支持mtk_aes硬件加密引擎，在Padavan的3.4内核中使用/dev/crypto用户接口实现。Openssl的cryptodev可以使用该接口。
测试机型：HC5861B
首先测试纯软件计算：
HC5861B:/home/root # openssl version -a
OpenSSL 1.0.2q 20 Nov 2018
built on: reproducible build, date unspecified
platform: linux-mipsel
options: bn(64,32) rc4(ptr,char) des(idx,cisc,2,long) blowfish(ptr)
compiler: /opt/rt-n56u/toolchain-mipsel/toolchain-3.4.x/bin/mipsel-linux-uclibc-gcc -mips32r2 -march=mips32r2 -I. -I.. -I../include -fPIC -DOPENSSL_PIC -Os -fomit-frame-pointer -pipe -DEMBED -I/opt/rt-n56u/trunk/stage/include -Dlinux -D__linux__ -Dunix -Wall -Wno-trigraphs -Wno-strict-aliasing -Wno-format-security -Wno-unused-but-set-variable -fno-tree-slsr -Wno-pointer-sign -ffunction-sections -fdata-sections -ffunction-sections -fdata-sections -I/opt/rt-n56u/trunk/stage/include -DOPENSSL_USE_IPV6=1 -DOPENSSL_SMALL_FOOTPRINT -DHAVE_CRYPTODEV -DOPENSSL_NO_ERR -O2 -fomit-frame-pointer -Wall -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DAES_ASM
OPENSSLDIR: "/etc/ssl"
HC5861B:/home/root # openssl speed -evp aes-256-ecb -elapsed
You have chosen to measure elapsed time instead of user CPU time.
Doing aes-256-ecb for 3s on 16 size blocks: 1160640 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 64 size blocks: 309012 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 256 size blocks: 79025 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 1024 size blocks: 19839 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 8192 size blocks: 2481 aes-256-ecb's in 3.00s
OpenSSL 1.0.2q 20 Nov 2018
built on: reproducible build, date unspecified
options:bn(64,32) rc4(ptr,char) des(idx,cisc,2,long) aes(partial) blowfish(ptr)
compiler: /opt/rt-n56u/toolchain-mipsel/toolchain-3.4.x/bin/mipsel-linux-uclibc-gcc -mips32r2 -march=mips32r2 -I. -I.. -I../include -fPIC -DOPENSSL_PIC -Os -fomit-frame-pointer -pipe -DEMBED -I/opt/rt-n56u/trunk/stage/include -Dlinux -D__linux__ -Dunix -Wall -Wno-trigraphs -Wno-strict-aliasing -Wno-format-security -Wno-unused-but-set-variable -fno-tree-slsr -Wno-pointer-sign -ffunction-sections -fdata-sections -ffunction-sections -fdata-sections -I/opt/rt-n56u/trunk/stage/include -DOPENSSL_USE_IPV6=1 -DOPENSSL_SMALL_FOOTPRINT -DHAVE_CRYPTODEV -DOPENSSL_NO_ERR -O2 -fomit-frame-pointer -Wall -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DAES_ASM
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-256-ecb 6190.08k 6592.26k 6743.47k 6771.71k 6774.78k
HC5861B:/home/root # openssl speed -evp aes-256-cbc -elapsed
You have chosen to measure elapsed time instead of user CPU time.
Doing aes-256-cbc for 3s on 16 size blocks: 996344 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 64 size blocks: 271735 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 256 size blocks: 69520 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 1024 size blocks: 17379 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 8192 size blocks: 2188 aes-256-cbc's in 3.00s
OpenSSL 1.0.2q 20 Nov 2018
built on: reproducible build, date unspecified
options:bn(64,32) rc4(ptr,char) des(idx,cisc,2,long) aes(partial) blowfish(ptr)
compiler: /opt/rt-n56u/toolchain-mipsel/toolchain-3.4.x/bin/mipsel-linux-uclibc-gcc -mips32r2 -march=mips32r2 -I. -I.. -I../include -fPIC -DOPENSSL_PIC -Os -fomit-frame-pointer -pipe -DEMBED -I/opt/rt-n56u/trunk/stage/include -Dlinux -D__linux__ -Dunix -Wall -Wno-trigraphs -Wno-strict-aliasing -Wno-format-security -Wno-unused-but-set-variable -fno-tree-slsr -Wno-pointer-sign -ffunction-sections -fdata-sections -ffunction-sections -fdata-sections -I/opt/rt-n56u/trunk/stage/include -DOPENSSL_USE_IPV6=1 -DOPENSSL_SMALL_FOOTPRINT -DHAVE_CRYPTODEV -DOPENSSL_NO_ERR -O2 -fomit-frame-pointer -Wall -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DAES_ASM
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-256-cbc 5313.83k 5797.01k 5932.37k 5932.03k 5974.70k
加载cryptodev模块并查看引擎信息：
HC5861B:/home/root # modprobe cryptodev
HC5861B:/home/root # openssl engine -c -t
(cryptodev) BSD cryptodev engine
[RSA, DSA, DH, AES-128-CBC, AES-192-CBC, AES-256-CBC, AES-128-ECB, AES-192-ECB, AES-256-ECB]
[ available ]
(dynamic) Dynamic engine loading support
[ unavailable ]
加载模块后再次测试：
HC5861B:/home/root # openssl speed -evp aes-256-ecb -engine cryptodev -elapsed
engine "cryptodev" set.
You have chosen to measure elapsed time instead of user CPU time.
Doing aes-256-ecb for 3s on 16 size blocks: 386312 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 64 size blocks: 355617 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 256 size blocks: 309646 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 1024 size blocks: 197916 aes-256-ecb's in 3.00s
Doing aes-256-ecb for 3s on 8192 size blocks: 40173 aes-256-ecb's in 3.00s
OpenSSL 1.0.2q 20 Nov 2018
built on: reproducible build, date unspecified
options:bn(64,32) rc4(ptr,char) des(idx,cisc,2,long) aes(partial) blowfish(ptr)
compiler: /opt/rt-n56u/toolchain-mipsel/toolchain-3.4.x/bin/mipsel-linux-uclibc-gcc -mips32r2 -march=mips32r2 -I. -I.. -I../include -fPIC -DOPENSSL_PIC -Os -fomit-frame-pointer -pipe -DEMBED -I/opt/rt-n56u/trunk/stage/include -Dlinux -D__linux__ -Dunix -Wall -Wno-trigraphs -Wno-strict-aliasing -Wno-format-security -Wno-unused-but-set-variable -fno-tree-slsr -Wno-pointer-sign -ffunction-sections -fdata-sections -ffunction-sections -fdata-sections -I/opt/rt-n56u/trunk/stage/include -DOPENSSL_USE_IPV6=1 -DOPENSSL_SMALL_FOOTPRINT -DHAVE_CRYPTODEV -DOPENSSL_NO_ERR -O2 -fomit-frame-pointer -Wall -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DAES_ASM
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-256-ecb 2060.33k 7586.50k 26423.13k 67555.33k 109699.07k
HC5861B:/home/root # openssl speed -evp aes-256-cbc -engine cryptodev -elapsed
engine "cryptodev" set.
You have chosen to measure elapsed time instead of user CPU time.
Doing aes-256-cbc for 3s on 16 size blocks: 376354 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 64 size blocks: 348704 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 256 size blocks: 305777 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 1024 size blocks: 194917 aes-256-cbc's in 3.00s
Doing aes-256-cbc for 3s on 8192 size blocks: 39748 aes-256-cbc's in 3.00s
OpenSSL 1.0.2q 20 Nov 2018
built on: reproducible build, date unspecified
options:bn(64,32) rc4(ptr,char) des(idx,cisc,2,long) aes(partial) blowfish(ptr)
compiler: /opt/rt-n56u/toolchain-mipsel/toolchain-3.4.x/bin/mipsel-linux-uclibc-gcc -mips32r2 -march=mips32r2 -I. -I.. -I../include -fPIC -DOPENSSL_PIC -Os -fomit-frame-pointer -pipe -DEMBED -I/opt/rt-n56u/trunk/stage/include -Dlinux -D__linux__ -Dunix -Wall -Wno-trigraphs -Wno-strict-aliasing -Wno-format-security -Wno-unused-but-set-variable -fno-tree-slsr -Wno-pointer-sign -ffunction-sections -fdata-sections -ffunction-sections -fdata-sections -I/opt/rt-n56u/trunk/stage/include -DOPENSSL_USE_IPV6=1 -DOPENSSL_SMALL_FOOTPRINT -DHAVE_CRYPTODEV -DOPENSSL_NO_ERR -O2 -fomit-frame-pointer -Wall -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DAES_ASM
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-256-cbc 2007.22k 7439.02k 26092.97k 66531.67k 108538.54k
可以看到在小block下，硬件计算的速度还不如软件计算，所以在Padavan中默认不会加载cryptodev模块。
