[GIT PULL net-next] crypto: Add Kerberos crypto lib

[David Howells <dhowells@redhat.com>]

Hi,

Could you pull this into the net-next tree please (it has been pulled into
the crypto tree[1])?  This provides the Kerberos-5 crypto parts needed by
the AF_RXRPC RxGK (GSSAPI) security class.  In the future, it could also be
used by NFS and SunRPC as much of the code is abstracted from there.  This
is a prerequisite for the rxrpc patches[2].

It does a couple of things:

 (1) Provide an AEAD crypto driver, krb5enc, that mirrors the authenc
     driver, but that hashes the plaintext, not the ciphertext.  This was
     made a separate module rather than just being a part of the authenc
     driver because it has to do all of the constituent operations in the
     opposite order - which impacts the async op handling.

     Testmgr data is provided for AES+SHA2 and Camellia combinations of
     authenc and krb5enc used by the krb5 library.  AES+SHA1 is not
     provided as the RFCs don't contain usable test vectors.

 (2) Provide a Kerberos 5 crypto library.  This is an extract from the
     sunrpc driver as that code can be shared between sunrpc/nfs and
     rxrpc/afs.  This provides encryption, decryption, get MIC and verify
     MIC routines that use and wrap the crypto functions, along with some
     functions to provide layout management.

     This supports AES+SHA1, AES+SHA2 and Camellia encryption types.

     Self-testing is provided that goes further than is possible with
     testmgr, doing subkey derivation as well.

David

Link: https://lore.kernel.org/linux-crypto/3709378.1740991489@warthog.procyon.org.uk/ [1]
Link: https://web.git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=rxrpc-next [2]

---
The following changes since commit 1e15510b71c99c6e49134d756df91069f7d18141:

  Merge tag 'net-6.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net (2025-02-27 09:32:42 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/crypto-krb5-20250228

for you to fetch changes up to 0dd8f8533a833eeb8e51034072a59930bcbec725:

  crypto/krb5: Implement crypto self-testing (2025-02-28 09:42:42 +0000)

----------------------------------------------------------------
crypto: Add Kerberos crypto lib

----------------------------------------------------------------
David Howells (17):
      crypto/krb5: Add API Documentation
      crypto/krb5: Add some constants out of sunrpc headers
      crypto: Add 'krb5enc' hash and cipher AEAD algorithm
      crypto/krb5: Test manager data
      crypto/krb5: Implement Kerberos crypto core
      crypto/krb5: Add an API to query the layout of the crypto section
      crypto/krb5: Add an API to alloc and prepare a crypto object
      crypto/krb5: Add an API to perform requests
      crypto/krb5: Provide infrastructure and key derivation
      crypto/krb5: Implement the Kerberos5 rfc3961 key derivation
      crypto/krb5: Provide RFC3961 setkey packaging functions
      crypto/krb5: Implement the Kerberos5 rfc3961 encrypt and decrypt functions
      crypto/krb5: Implement the Kerberos5 rfc3961 get_mic and verify_mic
      crypto/krb5: Implement the AES enctypes from rfc3962
      crypto/krb5: Implement the AES enctypes from rfc8009
      crypto/krb5: Implement the Camellia enctypes from rfc6803
      crypto/krb5: Implement crypto self-testing

 Documentation/crypto/index.rst   |   1 +
 Documentation/crypto/krb5.rst    | 262 +++++++++++++
 crypto/Kconfig                   |  13 +
 crypto/Makefile                  |   3 +
 crypto/krb5/Kconfig              |  26 ++
 crypto/krb5/Makefile             |  18 +
 crypto/krb5/internal.h           | 247 ++++++++++++
 crypto/krb5/krb5_api.c           | 452 ++++++++++++++++++++++
 crypto/krb5/krb5_kdf.c           | 145 +++++++
 crypto/krb5/rfc3961_simplified.c | 797 +++++++++++++++++++++++++++++++++++++++
 crypto/krb5/rfc3962_aes.c        | 115 ++++++
 crypto/krb5/rfc6803_camellia.c   | 237 ++++++++++++
 crypto/krb5/rfc8009_aes2.c       | 362 ++++++++++++++++++
 crypto/krb5/selftest.c           | 544 ++++++++++++++++++++++++++
 crypto/krb5/selftest_data.c      | 291 ++++++++++++++
 crypto/krb5enc.c                 | 504 +++++++++++++++++++++++++
 crypto/testmgr.c                 |  16 +
 crypto/testmgr.h                 | 351 +++++++++++++++++
 include/crypto/authenc.h         |   2 +
 include/crypto/krb5.h            | 160 ++++++++
 20 files changed, 4546 insertions(+)
 create mode 100644 Documentation/crypto/krb5.rst
 create mode 100644 crypto/krb5/Kconfig
 create mode 100644 crypto/krb5/Makefile
 create mode 100644 crypto/krb5/internal.h
 create mode 100644 crypto/krb5/krb5_api.c
 create mode 100644 crypto/krb5/krb5_kdf.c
 create mode 100644 crypto/krb5/rfc3961_simplified.c
 create mode 100644 crypto/krb5/rfc3962_aes.c
 create mode 100644 crypto/krb5/rfc6803_camellia.c
 create mode 100644 crypto/krb5/rfc8009_aes2.c
 create mode 100644 crypto/krb5/selftest.c
 create mode 100644 crypto/krb5/selftest_data.c
 create mode 100644 crypto/krb5enc.c
 create mode 100644 include/crypto/krb5.h