Lukas Wunner 1e562deace crypto: rsassa-pkcs1 - Migrate to sig_alg backend ... A sig_alg backend has just been introduced with the intent of moving all asymmetric sign/verify algorithms to it one by one. Migrate the sign/verify operations from rsa-pkcs1pad.c to a separate rsassa-pkcs1.c which uses the new backend. Consequently there are now two templates which build on the "rsa" akcipher_alg: * The existing "pkcs1pad" template, which is instantiated as an akcipher_instance and retains the encrypt/decrypt operations of RSAES-PKCS1-v1_5 (RFC 8017 sec 7.2). * The new "pkcs1" template, which is instantiated as a sig_instance and contains the sign/verify operations of RSASSA-PKCS1-v1_5 (RFC 8017 sec 8.2). In a separate step, rsa-pkcs1pad.c could optionally be renamed to rsaes-pkcs1.c for clarity. Additional "oaep" and "pss" templates could be added for RSAES-OAEP and RSASSA-PSS. Note that it's currently allowed to allocate a "pkcs1pad(rsa)" transform without specifying a hash algorithm. That makes sense if the transform is only used for encrypt/decrypt and continues to be supported. But for sign/verify, such transforms previously did not insert the Full Hash Prefix into the padding. The resulting message encoding was incompliant with EMSA-PKCS1-v1_5 (RFC 8017 sec 9.2) and therefore nonsensical. From here on in, it is no longer allowed to allocate a transform without specifying a hash algorithm if the transform is used for sign/verify operations. This simplifies the code because the insertion of the Full Hash Prefix is no longer optional, so various "if (digest_info)" clauses can be removed. There has been a previous attempt to forbid transform allocation without specifying a hash algorithm, namely by commit c0d20d22e0 ("crypto: rsa-pkcs1pad - Require hash to be present"). It had to be rolled back with commit b3a8c8a5eb ("crypto: rsa-pkcs1pad: Allow hash to be optional [ver #2]"), presumably because it broke allocation of a transform which was solely used for encrypt/decrypt, not sign/verify. Avoid such breakage by allowing transform allocation for encrypt/decrypt with and without specifying a hash algorithm (and simply ignoring the hash algorithm in the former case). So again, specifying a hash algorithm is now mandatory for sign/verify, but optional and ignored for encrypt/decrypt. The new sig_alg API uses kernel buffers instead of sglists, which avoids the overhead of copying signature and digest from sglists back into kernel buffers. rsassa-pkcs1.c is thus simplified quite a bit. sig_alg is always synchronous, whereas the underlying "rsa" akcipher_alg may be asynchronous. So await the result of the akcipher_alg, similar to crypto_akcipher_sync_{en,de}crypt(). As part of the migration, rename "rsa_digest_info" to "hash_prefix" to adhere to the spec language in RFC 9580. Otherwise keep the code unmodified wherever possible to ease reviewing and bisecting. Leave several simplification and hardening opportunities to separate commits. rsassa-pkcs1.c uses modern __free() syntax for allocation of buffers which need to be freed by kfree_sensitive(), hence a DEFINE_FREE() clause for kfree_sensitive() is introduced herein as a byproduct. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>		2024-10-05 13:22:04 +08:00
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apparmor	lsm/stable-6.12 PR 20240911	2024-09-16 18:19:47 +02:00
bpf	bpf: lsm: Set bpf_lsm_blob_sizes.lbs_task to 0	2024-09-11 10:11:36 -07:00
integrity	crypto: rsassa-pkcs1 - Migrate to sig_alg backend	2024-10-05 13:22:04 +08:00
ipe	ipe: Add missing terminator to list of unit tests	2024-09-23 15:53:37 -04:00
keys	KEYS: trusted: dcp: fix leak of blob encryption key	2024-08-15 22:01:14 +03:00
landlock	Landlock updates for v6.12-rc1	2024-09-24 10:40:11 -07:00
loadpin	introduce fd_file(), convert all accessors to it.	2024-08-12 22:00:43 -04:00
lockdown	lockdown: Make lockdown_lsmid static	2024-08-15 12:11:42 -04:00
safesetid
selinux	bpf-next-6.12-struct-fd	2024-09-24 14:54:26 -07:00
smack	lsm/stable-6.12 PR 20240923	2024-09-24 10:18:15 -07:00
tomoyo	tomoyo: fallback to realpath if symlink's pathname does not exist	2024-09-25 22:30:59 +09:00
yama	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
commoncap.c	lsm: Refactor return value of LSM hook vm_enough_memory	2024-07-31 14:46:51 -04:00
device_cgroup.c
inode.c	lsm: Use IS_ERR_OR_NULL() helper function	2024-08-29 11:12:13 -04:00
Kconfig	lsm/stable-6.12 PR 20240911	2024-09-16 18:19:47 +02:00
Kconfig.hardening	Revert "mm: init_mlocked_on_free_v3"	2024-06-15 10:43:05 -07:00
lsm_audit.c
lsm_syscalls.c	lsm: use 32-bit compatible data types in LSM syscalls	2024-03-14 11:31:26 -04:00
Makefile	lsm: add IPE lsm	2024-08-19 22:36:26 -04:00
min_addr.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
security.c	bpf-next-6.12-struct-fd	2024-09-24 14:54:26 -07:00