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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal">I am evaluating stunnel, to see if it is a viable solution for providing encryption in a system that contains an Atmel processor which includes a HW accelerated encryption block. I am just ramping up on stunnel, and figured I should capture
what I have done so far. My questions will come towards the end of my email. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My research indicates that stunnel incorporates openssl. I have been able to use openssl independently, to access the cryptodev HW encryption engine, in the Linux kernel module located in /lib/modules/4.14.79/extra/cryptodev.ko. When
openssl is run without accessing the cryptodev engine (cryptodev module not loaded), I get the pure SW encryption implementation provided by default in openssl. When I run bench mark speed tests using openssl, using SW encryption, I see the following results:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># time -v openssl speed -evp aes-128-cbc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 16 size blocks: 1689887 aes-128-cbc's in
<span style="color:red">2.95s<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 64 size blocks: 568389 aes-128-cbc's in
<span style="color:red">2.95s</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 256 size blocks: 151550 aes-128-cbc's in
<span style="color:red">2.96s</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 1024 size blocks: 38599 aes-128-cbc's in
<span style="color:red">2.96s</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 8192 size blocks: 4845 aes-128-cbc's in
<span style="color:red">2.95s<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">OpenSSL 1.0.2p-fips 14 Aug 2018<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">built on: reproducible build, date unspecified<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) idea(int) blowfish(ptr)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">compiler: arm-laird-linux-gnueabi-gcc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DZLIB_SHARED -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64 -O3 -DHAVE_CRYPTODEV -DUSE_CRYPTODEV_DIGESTS -Wall -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -I/home/sii/wb50n_space2_legacy_6.0.0.x/wb/buildroot/output/wb50n_space2_legacy/host/arm-buildroot-linux-gnueabi/sysroot/usr/local/ssl/fips-2.0/include
-DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">The 'numbers' are in 1000s of bytes per second processed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">aes-128-cbc 9165.49k 12331.15k 13107.03k 13353.17k 13454.32k<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Command being timed: "openssl speed -evp aes-128-cbc"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> User time (seconds): 14.81<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> System time (seconds): 0.10<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Percent of CPU this job got: 99%<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 15.06s<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average shared text size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average unshared data size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average stack size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average total size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Maximum resident set size (kbytes): 13376<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average resident set size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Major (requiring I/O) page faults: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Minor (reclaiming a frame) page faults: 145<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:red"> Voluntary context switches: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:red"> Involuntary context switches: 721<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Swaps: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> File system inputs: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> File system outputs: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Socket messages sent: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Socket messages received: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Signals delivered: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Page size (bytes): 4096<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Exit status: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">When I load the cryptodev module, and take advantage of the accelerated hardware encryption the benchmark tests are significantly faster. Here is what those results look like.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># modprobe cryptodev<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># time -v openssl speed -evp aes-128-cbc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 16 size blocks: 44163 aes-128-cbc's in
<span style="color:red">0.12s<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 64 size blocks: 31345 aes-128-cbc's in
<span style="color:red">0.15s</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 256 size blocks: 18923 aes-128-cbc's in
<span style="color:red">0.11s</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 1024 size blocks: 13847 aes-128-cbc's in
<span style="color:red">0.13s</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Doing aes-128-cbc for 3s on 8192 size blocks: 8427 aes-128-cbc's in
<span style="color:red">0.06s<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">OpenSSL 1.0.2p-fips 14 Aug 2018<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">built on: reproducible build, date unspecified<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) idea(int) blowfish(ptr)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">compiler: arm-laird-linux-gnueabi-gcc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DZLIB_SHARED -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64 -O3 -DHAVE_CRYPTODEV -DUSE_CRYPTODEV_DIGESTS -Wall -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -I/home/sii/wb50n_space2_legacy_6.0.0.x/wb/buildroot/output/wb50n_space2_legacy/host/arm-buildroot-linux-gnueabi/sysroot/usr/local/ssl/fips-2.0/include
-DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">The 'numbers' are in 1000s of bytes per second processed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">aes-128-cbc 5888.40k 13373.87k 44038.98k 109071.75k 1150566.40k<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Command being timed: "openssl speed -evp aes-128-cbc"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> User time (seconds): 0.59<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> System time (seconds): 8.72<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Percent of CPU this job got: 61%<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 15.11s<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average shared text size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average unshared data size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average stack size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average total size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Maximum resident set size (kbytes): 13792<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Average resident set size (kbytes): 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Major (requiring I/O) page faults: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Minor (reclaiming a frame) page faults: 144<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:red"> Voluntary context switches: 41154<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:red"> Involuntary context switches: 3321<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Swaps: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> File system inputs: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> File system outputs: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Socket messages sent: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Socket messages received: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Signals delivered: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Page size (bytes): 4096<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Exit status: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">As can be seen in the results (hi-lighted in red), the average speed to do aes-128-cbc encryption jumped from around 2.95 s to 0.10 s. Also of interest is the context switches are significantly higher when running hardware encryption,
because of interrupts and overhead to use the hardware engine. I can also look at /proc/interrupts and see significant increases in atmel-aes interrupt counts when using the cryptodev HW acceleration encryption engine. This gives a good indication that the
cryptodev module is in use, and is doing encryption.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to try to figure out how to allow stunnel to take advantage of the cryptodev HW acceleration encryption engine available in openssl. I have made some attempts, but so far, I have not been able to determine if stunnel is successfully
using the cryptodev engine. Here is what I have done with stunnel. I already have a client and server successfully communicating with each other using stunnel. To verify this I used the “nc” utility to send characters back and forth between two different
machines. The stunnel.conf file, on the server, is out of the box. I’m interested in encrypting on the client side. Here is my current client.conf file, in /etc/stunnel:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># cat client.conf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">debug = 7<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">output = /tmp/stunnel-server.log<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">pid = /tmp/stunnel.pid<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">engine = cryptodev<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[test]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">verify = 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">client = yes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">accept = 127.0.0.1:2000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">connect = 192.168.0.220:30000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">CAfile = /etc/stunnel/certificate.crt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">engineNum = 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">#<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am attempting to set up the cryptodev to be the configured engine for the client. I am able to start stunnel, using client.conf, as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># stunnel /etc/stunnel/client.conf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">If I do a “ps” command to display processes, I can see that stunnel is running in the background. At this point, I can use “nc” to send data, as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># nc 127.0.0.1 2000 < /tmp/long_file.txt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">I am able to see the text from long_file.txt on the server, which is also running nc. The problem is that I don’t see interrupts increasing in /proc/interrupts, which leaves me wondering if I have not configured stunnel correctly to use
the cryptodev engine. If I try to remove the cryptodev module as this point, while stunnel is running, I receive a message that it is in use, as follows:<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># modprobe -r cryptodev<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">modprobe: FATAL: Module cryptodev is in use.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">#<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I kill the stunnel process, I am able to successfully remove the cryptodev module, which seems to suggest stunnel is the process using the cryptodev module. Also, once I have removed the cryptodev module, I can’t restart stunnel. Instead,
I get the following errors back:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># stunnel /etc/stunnel/client.conf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[.] stunnel 5.44 on arm-buildroot-linux-gnueabi platform<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[.] Compiled/running with OpenSSL 1.0.2p-fips 14 Aug 2018<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[.] Threading:FORK Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[ ] errno: (*__errno_location ())<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[.] Reading configuration from file /etc/stunnel/client.conf<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[.] UTF-8 byte order mark not detected<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[ ] Enabling support for engine "cryptodev"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[!] error queue: 2606A074: error:2606A074:engine routines:ENGINE_by_id:no such engine<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[!] error queue: 260B6084: error:260B6084:engine routines:DYNAMIC_LOAD:dso not found<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[!] error queue: 25070067: error:25070067:DSO support routines:DSO_load:could not load the shared library<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[!] ENGINE_by_id: 25066067: error:25066067:DSO support routines:DLFCN_LOAD:could not load the shared library<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[!] /etc/stunnel/client.conf:5: "engine = cryptodev": Failed to open the engine<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">Again, this suggests stunnel is trying to use cryptodev. I just don’t know how to prove I am taking advantage of the HW encryption acceleration engine. I never see interrupts updating in /proc/interrupts when using nc, while stunnel is
running. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, here are my questions:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Does it look like I have things set up correctly in client.conf, to use the cryptodev engine?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>If client.conf is correct, how can I prove that stunnel is using the cryptodev engine, since I don’t see the expected interrupts?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">One idea is that the cryptodev module might not support the type of encryption being requested by the certificate, so openssl falls back to the pure SW encryption implementation. I know the Atmel chip in question supports the following:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""># openssl engine –t –c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">(cryptodev) cryptodev engine<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[RSA, DSA, DH, DES-CBC, DES-EDE3-CBC, AES-128-CBC, AES-192-CBC, AES-256-CBC, MD5, SHA1, SHA256, SHA384, SHA512]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> [ available ]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">(dynamic) Dynamic engine loading support<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> [ unavailable ]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">I was able to decode the contents of the certificate, and it says it is sha256WithRSAEncryption. My engine supports SHA256 and RSA, but does it support combining, like SHA256WithRSA? I’m not sure. I’ll keep chasing that one.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for any guidance on how to use the cryptodev in stunnel.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Tamar<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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