gopkg.in/ThalesIgnite/crypto11.v0

Crypto11

This is an implementation of the standard Golang hardware crypto interface that uses PKCS#11 as a backend. The supported features are:

• Generation and retrieval of RSA, DSA and ECDSA keys.
• PKCS#1 v1.5 signing.
• PKCS#1 PSS signing.
• PKCS#1 v1.5 decryption
• PKCS#1 OAEP decryption
• ECDSA signing.
• DSA signing.
• Random number generation.
• (Experimental) AES and DES3 encryption and decryption.
• (Experimental) HMAC support.

Signing is done through the crypto.Signer interface and decryption through crypto.Decrypter.

To verify signatures or encrypt messages, retrieve the public key and do it in software.

See the documentation for details of various limitations.

There are some rudimentary tests.

There is a demo web server in the demo directory, which publishes the contents of /usr/share/doc.

Installation

(If you don't have one already) create a standard Go workspace and set the GOPATH environment variable to point to the workspace root.

crypto11 manages it's dependencies via dep. To Install dep run:

go get -u github.com/golang/dep/cmd/dep

Clone, ensure deps, and build:

go get github.com/ThalesIgnite/crypto11
cd $GOPATH/src/github.com/ThalesIgnite/crypto11
dep ensure
go build

Edit config to taste, and then run the test program:

go test  -count=1

Testing Guidance

Testing with nShield

In all cases, it's worth enabling nShield PKCS#11 log output:

export CKNFAST_DEBUG=2

To protect keys with a 1/N operator cardset:

$ cat config
{
  "Path" : "/opt/nfast/toolkits/pkcs11/libcknfast.so",
  "TokenLabel": "rjk",
  "Pin" : "password"
}

You can also identify the token by serial number, which in this case means the first 16 hex digits of the operator cardset's token hash:

$ cat config
{
  "Path" : "/opt/nfast/toolkits/pkcs11/libcknfast.so",
  "TokenSerial": "1d42780caa22efd5",
  "Pin" : "password"
}

A card from the cardset must be in the slot when you run go test.

To protect keys with the module only, use the 'accelerator' token:

$ cat config
{
  "Path" : "/opt/nfast/toolkits/pkcs11/libcknfast.so",
  "TokenLabel": "accelerator",
  "Pin" : "password"
}

(At time of writing) GCM is not implemented, so expect test skips.

Testing with SoftHSM

While the aim of the exercise is to use an HSM, it can be convenient to test with a software-only provider.

To set up a slot:

$ cat softhsm.conf
0:softhsm0.db
$ export SOFTHSM_CONF=`pwd`/softhsm.conf
$ softhsm --init-token --slot 0 --label test
The SO PIN must have a length between 4 and 255 characters.
Enter SO PIN:
The user PIN must have a length between 4 and 255 characters.
Enter user PIN:
The token has been initialized.

Configure as follows:

$ cat config
{
  "Path" : "/usr/lib/softhsm/libsofthsm.so",
  "TokenLabel": "test",
  "Pin" : "password"
}

DSA, ECDSA, PSS and OAEP aren't supported, so expect test failures.

Testing with SoftHSM2

To set up a slot:

$ cat softhsm2.conf
directories.tokendir = /home/rjk/go/src/github.com/ThalesIgnite/crypto11/tokens
objectstore.backend = file
log.level = INFO
$ mkdir tokens
$ export SOFTHSM2_CONF=`pwd`/softhsm2.conf
$ softhsm2-util --init-token --slot 0 --label test
=== SO PIN (4-255 characters) ===
Please enter SO PIN: ********
Please reenter SO PIN: ********
=== User PIN (4-255 characters) ===
Please enter user PIN: ********
Please reenter user PIN: ********
The token has been initialized.

The configuration looks like this:

$ cat config
{
  "Path" : "/usr/lib/softhsm/libsofthsm2.so",
  "TokenLabel": "test",
  "Pin" : "password"
}

(At time of writing) OAEP is only partial and HMAC is unsupported, so expect test skips.

Limitations

• The PKCS1v15DecryptOptions SessionKeyLen field is not implemented and an error is returned if it is nonzero. The reason for this is that it is not possible for crypto11 to guarantee the constant-time behavior in the specification. See issue #5 for further discussion.
• Symmetric crypto support via cipher.Block is very slow. You can use the BlockModeCloser API (over 400 times as fast on my computer) but you must call the Close() interface (not found in cipher.BlockMode). See issue #6 for further discussion.

Wishlist

• Full test instructions for additional PKCS#11 implementations.
• A pony.

Copyright

MIT License.

Copyright 2016-2018 Thales e-Security, Inc

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.