YubiHSM and OpenSSL on Windows

This page covers setup, configuration, and usage of the Yubico YubiHSM2with OpenSSL on Windows 10.


The Windows OS does not come with many utilities and support found on Linux.This covers installation and usage on a bare Windows 10 system.

Aside from the bare OS, Visual Studio 2019 (v16.2) was installed. For this example, all of the binaries are 64 bit.

  1. Download the YubiHSM2 development kit.
  2. Download the libp11 source.
  3. Download the OpenSC installer.
  4. Download the Shining Light Productions OpenSSL installer.


YubiHSM2 Development Kit

Step 1:

Unzip the downloaded file to install the development kit. The development kit has utilities and a couple of MSI files.

Step 2:

Install the files (connector and CSG provider) to connect to the YubiHSM2. You should now be able to use the yubi-shell.exe to connect to the YubiHSM2.

Step 3:

Create the YubiHSM2 connector configuration file, and set the YUBIHSM_PKCS11_CONF environmental variable with its path and name. See below for example.

Yubihsm_pkcs11.cnf connector =

OpenSC and OpenSSL Distributions

The Shining Light Productions OpenSSL distribution is not an official distribution, but is provided by volunteers. Throw them a donation!

The OpenSC and OpenSSL distributions will be installed under C:\Program Files.

After OpenSC is installed, you should be able to access the YubiHSM2 usingpkcs11-tool.

C:\PROGRA~1\OpenSC Project\OpenSC\tools>set YUBIHSM_PKCS11_CONF=C:\Users\your_name

C:\PROGRA~1\OpenSC Project\OpenSC\tools>pkcs11-tool --module

    \yubihsm_pkcs11.dll --login --pin 0001password -I

Cryptoki version 2.40 Manufacturer Yubico (www.yubico.com)
Library YubiHSM PKCS#11 Library (ver 2.1)
Using slot 0 with a present token (0x0)

C:\PROGRA~1\OpenSC Project\OpenSC\tools>

libp11 Source

Download the libp11 source from GitHub. This will need to be compiled.

Step 1:Open a Visual Studio x64 Native Tools command prompt.
Step 2:Go to the source directory.
Step 3:Type: nmake -f Makefile.mak OPENSSL_DIR=\progra~1\OPENSS~1 BUILD_FOR=WIN64

The .dll files will be in the source directory.


Step 1:

Two environmental variables must be set: YUBIHSM_PKCS11_CONF and OPENSSL_CONF. These must be set to the location and file name of the respective configuration files. The OpenSSL configuration file is configured with the engine configuration at the top. The HSM PIN, which is its password, may be set in this file. The password here is the YubiHSM2 default password for the default administratoruser.

yubi_openssl.cnf openssl_conf = openssl_init [ openssl_init ]
engines = engines_section [ engines_section ]
pkcs11 = pkcs11_section [ pkcs11_section ]
engine_id = pkcs11
dynamic_path = C:\\Users\\your_name\\Documents\\sourceproj\\
pkcs11.dll MODULE_PATH = C:\\Users\\your_name\\yubihsm2-sdk-
yubihsm_pkcs11.dll PIN = 0001password init = 0
Step 2:

To run the OpenSSL tool commands, the rest of the file contains the normal configuration sections. OpenSSL v1.1.1c requires more configuration than v1.0.2, which is on Ubuntu. The following sections are for creating a self-signed certificate authority certificate. This is just for demonstration, and not to be placed on the FCT stations.

More yubi_openssl.cnf [ req ]
prompt = no
distinguished_name = req_distinguished_name
default_bits = 4096
string_mask = utf8only
default_md = sha256
x509_extensions = v3_ca_ext [ req_distinguished_name ]
countryName = US stateOrProvinceName = Washington
localityName = Seattle
organizationName = Banana Inc.
organizationalUnitName = Fruit Bunch
commonName = Root Test Cert [ v3_ca_ext ]
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always,issuer
basicConstraints = critical, CA:true
keyUsage = critical, digitalSignature, cRLSign, keyCertSign
certificatePolicies =, @policysection [ policysection ]
policyIdentifier =
userNotice.1 = @notice [ notice ]
explicitText = "Yubi Demo Banana Inc. Development Certificate"
Step 3:

At this point, you should be able to create a self-signed certificate. In this example, key ID 0:0064 is the identifier for a 4096-bit RSA key.

C:\Users\your_name>openssl req -new -x509 -days 365 -sha256
   -engine pkcs11 -keyform engine -key 0:0064 -out cert.pem
   engine "pkcs11" set.
C:\Users\your_name>dir cert.pem
   Volume in drive C is OSDisk
   Volume Serial Number is AC07-5227
   Directory of C:\Users\your_name 08/22/2019 02:20 PM 2,322 cert.pem
   1 File(s) 2,322 bytes
   0 Dir(s) 179,197,755,392 bytes
   free C:\Users\your_name>openssl x509 -noout -text -in cert.pem
   Certificate: Data: Version: 3 (0x2)
   Serial Number:
   Signature Algorithm: sha256WithRSAEncryption Issuer: C = US,
      ST = Washington, L = Seattle, O = Banana Inc.,
      OU = Fruit Bunch,
      CN = Root Test Cert Validity Not Before:
      Aug 22 21:20:07 2019 GMT
      Not After : Aug 21 21:20:07 2020 GMT Subject: C = US,
      ST = Washington, L = Seattle, O = Banana Inc.,
      OU = Fruit Bunch,
      CN = Root Test Cert Subject Public Key Info:
      Public Key Algorithm: rsaEncryption RSA Public-Key:
      (4096 bit)
      Modulus: 00:bd:0c:71:1a:4b:19:86:17:d0:d1:bf:c7:27:83: