Crypto library updates for 7.3

The following changes since commit 1590cf0329716306e948a8fc29f1d3ee87d3989f:

Linux 7.2-rc4 (2026-07-19 13:54:41 -0700)

are available in the Git repository at:

https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git tags/libcrypto-updates-for-linus

for you to fetch changes up to ff6ac629076fb3f369c6ad35d6ead1c666469b95:

mac80211: fils_aead: Use __cleanup() instead of memzero_explicit() (2026-08-12 18:50:59 -0700)

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Add library APIs for most AES encryption modes that are used in the kernel (ECB, CBC, CBC-CTS, CTR, XCTR, XTS, GCM, CCM).

These AES modes have many in-kernel users that are currently using the crypto_skcipher or crypto_aead APIs. These existing APIs are difficult to use and inefficient. Until now, the lack of proper library support for these has been the main gap in the crypto library.

This set of changes is the next stage of addressing it:

- Implement the new APIs on top of the existing support for single-block AES in the library.

- Fully document the new APIs.

- Migrate the only user of the old AES-GCM library API to the new, more flexible API; then remove the old API and its implementation.

- Wire up the new APIs to the traditional crypto API by adding crypto_skcipher and crypto_aead algorithms.

This makes the new APIs be covered by the traditional crypto API's self-tests. It also makes them be already used for real on systems that don't have architecture-optimized code for these modes.

But most importantly, this is a prerequisite for migrating the architecture-optimized code for these AES modes (i.e. arch/*/crypto/aes*) into the library, which as usual will eliminate a lot of redundant "glue" code.

Note that unlike some of the other algorithms that have been migrated to the library, e.g. SHA-512, for these AES modes there was too much to get done in one cycle. Nor did it make sense to handle these modes one at a time, because they tend to be coupled together or depend on each other, especially in the architecture-optimized AES code.

Thus, most of the benefits (reductions in lines of code, performance improvements, etc.) will follow in later cycles when architecture-optimized code is migrated into the library and users of crypto_skcipher and crypto_aead are updated to use the new APIs.

The design of the new APIs was informed by writing proof-of-concept patches for many kernel subsystems currently accessing these same algorithms via crypto_skcipher or crypto_aead (patches 18-33 of
https://lore.kernel.org/r/[email protected]/).

While those patches will be resent for real later, the total diffstat for them was negative 1905 lines. So clearly the new APIs are quite a bit easier to use and align better with what users actually need.

Besides the new AES encryption APIs, there are also a few changes for improved AES-CMAC key and context zeroization.

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Eric Biggers (16):
crypto: xts - Split out __xts_verify_key() helper lib/crypto: aes: Add ECB support
lib/crypto: aes: Add CBC and CBC-CTS support lib/crypto: aes: Add CTR and XCTR support lib/crypto: aes: Add XTS support
lib/crypto: aes: Add GCM support
lib/crypto: aes: Add CCM support
crypto: aes - Add ECB support using library
crypto: aes - Add CBC and CBC-CTS support using library
crypto: aes - Add CTR and XCTR support using library
crypto: aes - Add XTS support using library
crypto: aes - Add GCM support using library
crypto: aes - Add CCM support using library x86/sev: Use new AES-GCM library
x86/sev: Remove obsolete virtual address check lib/crypto: aesgcm: Remove old AES-GCM library

Thomas Huth (4):
lib/crypto: aes-cmac: Add zeroization functions
smb: clear the aes_cmac_key and aes_cmac_ctx when done
Bluetooth: SMP: clear the aes_cmac_key when done
mac80211: fils_aead: Use __cleanup() instead of memzero_explicit()

 Documentation/crypto/libcrypto-auth-encryption.rst |   20 +
 .../crypto/libcrypto-unauth-encryption.rst         |   49 +
 Documentation/crypto/libcrypto.rst                 |    2 +
 arch/x86/Kconfig                                   |    2 +-
 arch/x86/coco/sev/core.c                           |   53 +-
 arch/x86/include/asm/sev.h                         |    2 +-
 crypto/Kconfig                                     |   11 +
 crypto/aes.c                                       |  892 ++++++++++++++-
 drivers/virt/coco/sev-guest/sev-guest.c            |    7 +-
 fs/smb/client/smb2transport.c                      |    4 +-
 fs/smb/server/auth.c                               |    2 +-
 include/crypto/aes-cbc-macs.h                      |   34 +
 include/crypto/aes-cbc.h                           |   77 ++
 include/crypto/aes-ccm.h                           |  266 +++++
 include/crypto/aes-ctr.h                           |   65 ++
 include/crypto/aes-ecb.h                           |   49 +
 include/crypto/aes-gcm.h                           |  260 +++++
 include/crypto/aes-xts.h                           |   94 ++
 include/crypto/gcm.h                               |   25 +-
 include/crypto/xts.h                               |   18 +-
 lib/crypto/Kconfig                                 |   41 +-
 lib/crypto/Makefile                                |    3 -
 lib/crypto/aes.c                                   | 1163 ++++++++++++++++++++
 lib/crypto/aesgcm.c                                |  721 ------------
 lib/crypto/tests/Kconfig                           |    6 +
 net/bluetooth/smp.c                                |    3 +-
 net/mac80211/fils_aead.c                           |    3 +-
 27 files changed, 3073 insertions(+), 799 deletions(-)
 create mode 100644 Documentation/crypto/libcrypto-auth-encryption.rst
 create mode 100644 Documentation/crypto/libcrypto-unauth-encryption.rst
 create mode 100644 include/crypto/aes-cbc.h
 create mode 100644 include/crypto/aes-ccm.h
 create mode 100644 include/crypto/aes-ctr.h
 create mode 100644 include/crypto/aes-ecb.h
 create mode 100644 include/crypto/aes-gcm.h
 create mode 100644 include/crypto/aes-xts.h
 delete mode 100644 lib/crypto/aesgcm.c