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authorGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>2009-03-04 02:05:33 -0500
committerHerbert Xu <herbert@gondor.apana.org.au>2009-03-04 02:05:33 -0500
commita1d2f09544065b60598b8167d94a6371bff3e892 (patch)
treecd8b88e7ea0cd44e7e369f670f9fdfcba78f4326 /crypto/Kconfig
parente9cc8bddaea3944fabfebb968bc88d603239beed (diff)
crypto: compress - Add pcomp interface
The current "comp" crypto interface supports one-shot (de)compression only, i.e. the whole data buffer to be (de)compressed must be passed at once, and the whole (de)compressed data buffer will be received at once. In several use-cases (e.g. compressed file systems that store files in big compressed blocks), this workflow is not suitable. Furthermore, the "comp" type doesn't provide for the configuration of (de)compression parameters, and always allocates workspace memory for both compression and decompression, which may waste memory. To solve this, add a "pcomp" partial (de)compression interface that provides the following operations: - crypto_compress_{init,update,final}() for compression, - crypto_decompress_{init,update,final}() for decompression, - crypto_{,de}compress_setup(), to configure (de)compression parameters (incl. allocating workspace memory). The (de)compression methods take a struct comp_request, which was mimicked after the z_stream object in zlib, and contains buffer pointer and length pairs for input and output. The setup methods take an opaque parameter pointer and length pair. Parameters are supposed to be encoded using netlink attributes, whose meanings depend on the actual (name of the) (de)compression algorithm. Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 4a3e6b225189..1676f171c54b 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -76,6 +76,10 @@ config CRYPTO_RNG2
76 tristate 76 tristate
77 select CRYPTO_ALGAPI2 77 select CRYPTO_ALGAPI2
78 78
79config CRYPTO_PCOMP
80 tristate
81 select CRYPTO_ALGAPI2
82
79config CRYPTO_MANAGER 83config CRYPTO_MANAGER
80 tristate "Cryptographic algorithm manager" 84 tristate "Cryptographic algorithm manager"
81 select CRYPTO_MANAGER2 85 select CRYPTO_MANAGER2