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authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-10 14:04:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-10 14:04:16 -0700
commit30066ce675d3af350bc5a53858991c0b518dda00 (patch)
tree75db2274cd0887b11b4e297771287f0fb4c14b81 /Documentation/DocBook
parent6763afe4b9f39142bda2a92d69e62fe85f67251c (diff)
parentc3afafa47898e34eb49828ec4ac92bcdc81c8f0c (diff)
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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu: "Here is the crypto update for 4.9: API: - The crypto engine code now supports hashes. Algorithms: - Allow keys >= 2048 bits in FIPS mode for RSA. Drivers: - Memory overwrite fix for vmx ghash. - Add support for building ARM sha1-neon in Thumb2 mode. - Reenable ARM ghash-ce code by adding import/export. - Reenable img-hash by adding import/export. - Add support for multiple cores in omap-aes. - Add little-endian support for sha1-powerpc. - Add Cavium HWRNG driver for ThunderX SoC" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (137 commits) crypto: caam - treat SGT address pointer as u64 crypto: ccp - Make syslog errors human-readable crypto: ccp - clean up data structure crypto: vmx - Ensure ghash-generic is enabled crypto: testmgr - add guard to dst buffer for ahash_export crypto: caam - Unmap region obtained by of_iomap crypto: sha1-powerpc - little-endian support crypto: gcm - Fix IV buffer size in crypto_gcm_setkey crypto: vmx - Fix memory corruption caused by p8_ghash crypto: ghash-generic - move common definitions to a new header file crypto: caam - fix sg dump hwrng: omap - Only fail if pm_runtime_get_sync returns < 0 crypto: omap-sham - shrink the internal buffer size crypto: omap-sham - add support for export/import crypto: omap-sham - convert driver logic to use sgs for data xmit crypto: omap-sham - change the DMA threshold value to a define crypto: omap-sham - add support functions for sg based data handling crypto: omap-sham - rename sgl to sgl_tmp for deprecation crypto: omap-sham - align algorithms on word offset crypto: omap-sham - add context export/import stubs ...
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/crypto-API.tmpl38
1 files changed, 26 insertions, 12 deletions
diff --git a/Documentation/DocBook/crypto-API.tmpl b/Documentation/DocBook/crypto-API.tmpl
index fb2a1526f6ec..088b79c341ff 100644
--- a/Documentation/DocBook/crypto-API.tmpl
+++ b/Documentation/DocBook/crypto-API.tmpl
@@ -797,7 +797,8 @@ kernel crypto API | Caller
include/linux/crypto.h and their definition can be seen below.
The former function registers a single transformation, while
the latter works on an array of transformation descriptions.
- The latter is useful when registering transformations in bulk.
+ The latter is useful when registering transformations in bulk,
+ for example when a driver implements multiple transformations.
</para>
<programlisting>
@@ -822,18 +823,31 @@ kernel crypto API | Caller
</para>
<para>
- The bulk registration / unregistration functions require
- that struct crypto_alg is an array of count size. These
- functions simply loop over that array and register /
- unregister each individual algorithm. If an error occurs,
- the loop is terminated at the offending algorithm definition.
- That means, the algorithms prior to the offending algorithm
- are successfully registered. Note, the caller has no way of
- knowing which cipher implementations have successfully
- registered. If this is important to know, the caller should
- loop through the different implementations using the single
- instance *_alg functions for each individual implementation.
+ The bulk registration/unregistration functions
+ register/unregister each transformation in the given array of
+ length count. They handle errors as follows:
</para>
+ <itemizedlist>
+ <listitem>
+ <para>
+ crypto_register_algs() succeeds if and only if it
+ successfully registers all the given transformations. If an
+ error occurs partway through, then it rolls back successful
+ registrations before returning the error code. Note that if
+ a driver needs to handle registration errors for individual
+ transformations, then it will need to use the non-bulk
+ function crypto_register_alg() instead.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ crypto_unregister_algs() tries to unregister all the given
+ transformations, continuing on error. It logs errors and
+ always returns zero.
+ </para>
+ </listitem>
+ </itemizedlist>
+
</sect1>
<sect1><title>Single-Block Symmetric Ciphers [CIPHER]</title>