If You Choose iKGF as Your Issuer

Table of Contents

• Tools for Creating Revocation Requests
  • Requesting Group Revocation
  • Requesting Private Key Revocation
  • Requesting Signature Revocation
• Tools for Extracting Keys from iKGF Files
  • Extracting Group Public Keys
  • Extracting Member Private Keys

To use the Intel® EPID APIs, you need to use the following items that are created by the issuer:

• Group public key, which corresponds to the issuing private key kept by the issuer
• Member private keys
• Signature based revocation list (SigRL)
• Private key based revocation list (PrivRL)
• Group based revocation list (GroupRL)

If you want to use the Intel Key Generation Facility (iKGF) as the issuer, contact info@.nosp@m.digi.nosp@m.tal-c.nosp@m.p.co.nosp@m.m to get started.

If you choose to use iKGF as the issuer, you can take advantage of tools included in the SDK that are designed to make it easier for you to interact with iKGF by creating requests to update revocation lists and by extracting member private keys and group public keys from iKGF files.

Tools for Creating Revocation Requests

The Intel® EPID SDK includes tools to help you request additions to revocation lists managed by iKGF if you are using iKGF as the issuer.

These tools are designed to create a revocation request in the format required by iKGF. In order to update a revocation list, the requests generated by these tools must be submitted to the issuer.

To access the tools, go to _install/epid-sdk/tools in the SDK directory.

You need to build the SDK before you can use these tools. For more information, refer to Building from Source.

The following tools are available:

Tool	Purpose
revokegrp	Create group revocation request
revokekey	Create member private key revocation request
revokesig	Create signature revocation request

Requesting Group Revocation

The revokegrp tool adds a group to the revocation request file.

Usage: revokegrp [OPTION]...
Revoke Intel(R) EPID group

Options:
  --gpubkey=FILE
      load group public key from FILE (default: pubkey.bin)

  --capubkey=FILE
      load IoT Issuing CA public key from FILE

  --reason=NUM
      revocation reason (default: 0)

  --req=FILE
      append group revocation request to FILE (default: grprlreq.dat)

  -h, --help
      display this help and exit

  -v, --verbose
      print status messages to stdout

Requesting Private Key Revocation

The revokekey tool adds a member private key to the revocation request file.

Usage: revokekey [OPTION]
Revoke Intel(R) EPID private key

Options:
    --mprivkey=FILE
        load private key to revoke from FILE (default: mprivkey.dat)

    --req=FILE
        append private key revocation request to FILE (default: privreq.dat)

    -h, --help
        display this help and exit

    -v,--verbose
        print status messages to stdout

The following options are only needed for compressed keys:

    --gpubkey=FILE
        load group public key from FILE (default: pubkey.bin)

    --capubkey=FILE
        load IoT Issuing CA public key from FILE

Requesting Signature Revocation

The revokesig tool creates a request to add a signature to the revocation request file.

revokesig only accepts valid signatures for addition to the revocation request.

Usage: revokesig [OPTION]...
Revoke Intel(R) EPID signature

Options:
  --sig=FILE
      load signature to revoke from FILE (default: sig.dat)

  --msg=MESSAGE
      MESSAGE used to generate signature to revoke

  --msgfile=FILE
      FILE containing message used to generate signature to revoke

  --gpubkey=FILE
      load group public key from FILE (default: pubkey.bin)

  --capubkey=FILE
      load IoT Issuing CA public key from FILE

  --req=FILE
      append signature revocation request to FILE (default: sigrlreq.dat)

  -h, --help
      display this help and exit

  -v, --verbose
      print status messages to stdout

Tools for Extracting Keys from iKGF Files

The Intel® EPID SDK includes tools to help you extract individual keys from files provided by the Intel Key Generation Facility (iKGF) if you are using iKGF as the issuer.

To access the tools, go to _install/epid-sdk/tools in the SDK directory.

You need to build the SDK before you can use these tools. For more information, refer to Building from Source.

The following tools are available:

Tool	Purpose
extractgrps	Extracts group public keys
extractkeys	Extracts member private keys

Extracting Group Public Keys

The extractgrps tool extracts group public keys from the input file to the current directory.

Usage: extractgrps [OPTION]... [FILE] [NUM]
Extract the first NUM group certs from FILE to current directory

Options:
  -h, --help
      display this help and exit

  -v, --verbose
      print status messages to stdout

Extracting Member Private Keys

The extractkeys tool extracts member private keys from the input file to the current directory.

Usage: extractkeys [OPTION]... [FILE] [NUM]
Extract the first NUM private keys from FILE to current directory.

Options:
  -c, --compressed
      extract compressed keys

  -h, --help
      display this help and exit

  -v, --verbose
      print status messages to stdout