linux-kernel - [PATCH v2 1/2] blk-crypto: export wrapped key functions

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Message-ID: <20250501212320.8281-2-ebiggers@kernel.org>
Date: Thu,  1 May 2025 14:23:19 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: dm-devel@...ts.linux.dev,
	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-fscrypt@...r.kernel.org,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Gaurav Kashyap <quic_gaurkash@...cinc.com>
Subject: [PATCH v2 1/2] blk-crypto: export wrapped key functions

From: Eric Biggers <ebiggers@...gle.com>

Export blk_crypto_derive_sw_secret(), blk_crypto_import_key(),
blk_crypto_generate_key(), and blk_crypto_prepare_key() so that they can
be used by device-mapper when passing through wrapped key support.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 block/blk-crypto-profile.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/blk-crypto-profile.c b/block/blk-crypto-profile.c
index 94a155912bf1c..81918f6e0caea 100644
--- a/block/blk-crypto-profile.c
+++ b/block/blk-crypto-profile.c
@@ -499,10 +499,11 @@ int blk_crypto_derive_sw_secret(struct block_device *bdev,
 	err = profile->ll_ops.derive_sw_secret(profile, eph_key, eph_key_size,
 					       sw_secret);
 	blk_crypto_hw_exit(profile);
 	return err;
 }
+EXPORT_SYMBOL_GPL(blk_crypto_derive_sw_secret);
 
 int blk_crypto_import_key(struct blk_crypto_profile *profile,
 			  const u8 *raw_key, size_t raw_key_size,
 			  u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
 {
@@ -518,10 +519,11 @@ int blk_crypto_import_key(struct blk_crypto_profile *profile,
 	ret = profile->ll_ops.import_key(profile, raw_key, raw_key_size,
 					 lt_key);
 	blk_crypto_hw_exit(profile);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(blk_crypto_import_key);
 
 int blk_crypto_generate_key(struct blk_crypto_profile *profile,
 			    u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
 {
 	int ret;
@@ -535,10 +537,11 @@ int blk_crypto_generate_key(struct blk_crypto_profile *profile,
 	blk_crypto_hw_enter(profile);
 	ret = profile->ll_ops.generate_key(profile, lt_key);
 	blk_crypto_hw_exit(profile);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(blk_crypto_generate_key);
 
 int blk_crypto_prepare_key(struct blk_crypto_profile *profile,
 			   const u8 *lt_key, size_t lt_key_size,
 			   u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
 {
@@ -554,10 +557,11 @@ int blk_crypto_prepare_key(struct blk_crypto_profile *profile,
 	ret = profile->ll_ops.prepare_key(profile, lt_key, lt_key_size,
 					  eph_key);
 	blk_crypto_hw_exit(profile);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(blk_crypto_prepare_key);
 
 /**
  * blk_crypto_intersect_capabilities() - restrict supported crypto capabilities
  *					 by child device
  * @parent: the crypto profile for the parent device
-- 
2.49.0