blk-crypto: export wrapped key functions

JIRA: https://issues.redhat.com/browse/RHEL-119008
Upstream Status: kernel/git/torvalds/linux.git

commit 025e138
Author: Eric Biggers <ebiggers@google.com>
Date:   Thu May 1 14:23:19 2025 -0700

    blk-crypto: export wrapped key functions

    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@google.com>
    Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>

Author: bmarzins

block/blk-crypto-profile.c

@@ -501,6 +501,7 @@ int blk_crypto_derive_sw_secret(struct block_device *bdev,
 	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,
@@ -520,6 +521,7 @@ int blk_crypto_import_key(struct blk_crypto_profile *profile,
 	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])
@@ -537,6 +539,7 @@ int blk_crypto_generate_key(struct blk_crypto_profile *profile,
 	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,
@@ -556,6 +559,7 @@ int blk_crypto_prepare_key(struct blk_crypto_profile *profile,
 	blk_crypto_hw_exit(profile);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(blk_crypto_prepare_key);
 
 /**
  * blk_crypto_intersect_capabilities() - restrict supported crypto capabilities