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libgcrypt-image-minimal

Minimal demo image showcasing libgcrypt with wolfSSL FIPS backend.

Overview

This image demonstrates libgcrypt configured to use wolfSSL's FIPS-validated wolfCrypt as its cryptographic backend. This allows any application using libgcrypt (GnuPG, systemd, etc.) to benefit from FIPS 140-3 validated cryptography.

What's Included

  • Everything from wolfssl-image-minimal
  • wolfSSL FIPS (auto-configured for libgcrypt support)
  • libgcrypt 1.11.0 with wolfSSL backend
  • libgcrypt-ptest (test suite)
  • ptest-runner (test execution tool)

Configuration

In build/conf/local.conf:

# Enable demo images
WOLFSSL_DEMOS = "wolfssl-image-minimal libgcrypt-image-minimal"

# Configure FIPS bundle (use absolute path)
require /path/to/meta-wolfssl/conf/wolfssl-fips.conf

Build:

bitbake libgcrypt-image-minimal

Run in QEMU:

runqemu libgcrypt-image-minimal nographic

Testing

Inside QEMU, run the libgcrypt test suite:

# Run all ptests
ptest-runner

# Run only libgcrypt tests
ptest-runner libgcrypt

Expected Output

The libgcrypt test suite should pass with the wolfSSL backend:

START: ptest-runner
BEGIN: /usr/lib/libgcrypt/ptest
PASS: basic
PASS: mpitests
PASS: t-mpi-bit
PASS: curves
PASS: fips186-dsa
...
END: /usr/lib/libgcrypt/ptest
STOP: ptest-runner

How It Works

wolfssl-fips Configuration

The wolfssl-fips.bbappend in this directory automatically configures wolfssl-fips with features needed by libgcrypt:

require ${WOLFSSL_LAYERDIR}/inc/wolfssl-fips/wolfssl-enable-libgcrypt.inc

This adds:

  • --enable-fips=v5
  • --enable-keygen
  • Required compile flags (HAVE_AES_ECB, WC_RSA_DIRECT, etc.)

libgcrypt Configuration

The libgcrypt_%.bbappend conditionally switches libgcrypt to the wolfSSL backend when wolfssl-fips is the provider:

inherit wolfssl-osp-support

python __anonymous() {
    wolfssl_osp_include_if_provider(
        d,
        inc_file='inc/libgcrypt/libgcrypt-enable-wolfssl.inc',
        allowed_providers=['wolfssl-fips']
    )
}

This:

  • Switches to github.com/wolfSSL/libgcrypt-wolfssl source
  • Configures with --enable-wolfssl-fips
  • Adds wolfSSL dependencies

Applications

With this image, any application using libgcrypt will automatically use FIPS-validated cryptography:

  • GnuPG: Encryption, signing, key management
  • systemd: System services encryption
  • NetworkManager: WPA/WPA2 authentication
  • cryptsetup: Disk encryption (LUKS)

Requirements

  • Valid wolfSSL FIPS commercial bundle
  • wolfssl-fips configured as provider
  • libgcrypt 1.11.0+ (provided by wolfSSL fork)

Troubleshooting

Test Failures

If ptests fail, check:

  1. FIPS hash is correct: wolfSSL FIPS auto-hash should have generated the correct hash
  2. All features enabled: Verify wolfssl-fips has all required flags (see inc/wolfssl-fips/wolfssl-enable-libgcrypt.inc)
  3. Dependencies: Ensure wolfssl-fips is properly built and installed

Build Errors

If build fails, ensure:

  1. FIPS bundle is accessible: Check WOLFSSL_SRC_DIR in conf/wolfssl-fips.conf
  2. FIPS config is included: require conf/wolfssl-fips.conf in local.conf
  3. Demo is enabled: WOLFSSL_DEMOS includes both base and libgcrypt images

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