[RFC PATCH 8/8] generic: verify ciphertext with hardware-wrapped keys

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Add two tests which verify that encrypted files are encrypted correctly
when a hardware-wrapped inline encryption key is used.  The two tests
are identical except that one uses FSCRYPT_POLICY_FLAG_IV_INO_LBLK_64
and the other uses FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32.  These cover both
of the settings where hardware-wrapped keys currently may be used.

I've verified that these tests run and pass when all prerequisites are
met, namely:

- Hardware supporting the feature must be present.  I tested this on the
  SM8350 HDK (note: this currently requires a custom TrustZone image);
  this hardware is compatible with both of IV_INO_LBLK_{64,32}.
- The kernel patches for hardware-wrapped key support must be applied.
- The filesystem must be ext4 or f2fs.
- The kernel must have CONFIG_FS_ENCRYPTION_INLINE_CRYPT=y.
- The fscryptctl program must be available, and must have patches for
  hardware-wrapped key support applied.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 tests/generic/900     | 30 ++++++++++++++++++++++++++++++
 tests/generic/900.out |  6 ++++++
 tests/generic/901     | 30 ++++++++++++++++++++++++++++++
 tests/generic/901.out |  6 ++++++
 4 files changed, 72 insertions(+)
 create mode 100755 tests/generic/900
 create mode 100644 tests/generic/900.out
 create mode 100755 tests/generic/901
 create mode 100644 tests/generic/901.out

diff --git a/tests/generic/900 b/tests/generic/900
new file mode 100755
index 00000000..a021732e
--- /dev/null
+++ b/tests/generic/900
@@ -0,0 +1,30 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2022 Google LLC
+#
+# FS QA Test No. 900
+#
+# Verify the ciphertext for encryption policies that use the HW_WRAPPED_KEY and
+# IV_INO_LBLK_64 flags and that use AES-256-XTS to encrypt file contents and
+# AES-256-CTS-CBC to encrypt file names.
+#
+. ./common/preamble
+_begin_fstest auto quick encrypt
+
+# Import common functions.
+. ./common/filter
+. ./common/encrypt
+
+# real QA test starts here
+_supported_fs generic
+
+# Hardware-wrapped keys require the inlinecrypt mount option.
+_require_scratch_inlinecrypt
+export MOUNT_OPTIONS="$MOUNT_OPTIONS -o inlinecrypt"
+
+_verify_ciphertext_for_encryption_policy AES-256-XTS AES-256-CTS-CBC \
+	v2 iv_ino_lblk_64 hw_wrapped_key
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/900.out b/tests/generic/900.out
new file mode 100644
index 00000000..9edc012c
--- /dev/null
+++ b/tests/generic/900.out
@@ -0,0 +1,6 @@
+QA output created by 900
+
+Verifying ciphertext with parameters:
+	contents_encryption_mode: AES-256-XTS
+	filenames_encryption_mode: AES-256-CTS-CBC
+	options: v2 iv_ino_lblk_64 hw_wrapped_key
diff --git a/tests/generic/901 b/tests/generic/901
new file mode 100755
index 00000000..dd5c6e5f
--- /dev/null
+++ b/tests/generic/901
@@ -0,0 +1,30 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2022 Google LLC
+#
+# FS QA Test No. 901
+#
+# Verify the ciphertext for encryption policies that use the HW_WRAPPED_KEY and
+# IV_INO_LBLK_32 flags and that use AES-256-XTS to encrypt file contents and
+# AES-256-CTS-CBC to encrypt file names.
+#
+. ./common/preamble
+_begin_fstest auto quick encrypt
+
+# Import common functions.
+. ./common/filter
+. ./common/encrypt
+
+# real QA test starts here
+_supported_fs generic
+
+# Hardware-wrapped keys require the inlinecrypt mount option.
+_require_scratch_inlinecrypt
+export MOUNT_OPTIONS="$MOUNT_OPTIONS -o inlinecrypt"
+
+_verify_ciphertext_for_encryption_policy AES-256-XTS AES-256-CTS-CBC \
+	v2 iv_ino_lblk_32 hw_wrapped_key
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/901.out b/tests/generic/901.out
new file mode 100644
index 00000000..2f928465
--- /dev/null
+++ b/tests/generic/901.out
@@ -0,0 +1,6 @@
+QA output created by 901
+
+Verifying ciphertext with parameters:
+	contents_encryption_mode: AES-256-XTS
+	filenames_encryption_mode: AES-256-CTS-CBC
+	options: v2 iv_ino_lblk_32 hw_wrapped_key
-- 
2.35.1