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authorStephan Mueller <smueller@chronox.de>2017-07-30 15:32:58 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2017-08-09 15:17:52 +0300
commit72548b093ee38a6d4f2a19e6ef1948ae05c181f7 (patch)
tree630095bdb72ca2c0e616f7accea0f0d826d3f2c0 /crypto/Kconfig
parent5703c826b758e0b33c998739af093879979315b8 (diff)
downloadlinux-72548b093ee38a6d4f2a19e6ef1948ae05c181f7.tar.xz
crypto: algif_aead - copy AAD from src to dst
Use the NULL cipher to copy the AAD and PT/CT from the TX SGL to the RX SGL. This allows an in-place crypto operation on the RX SGL for encryption, because the TX data is always smaller or equal to the RX data (the RX data will hold the tag). For decryption, a per-request TX SGL is created which will only hold the tag value. As the RX SGL will have no space for the tag value and an in-place operation will not write the tag buffer, the TX SGL with the tag value is chained to the RX SGL. This now allows an in-place crypto operation. For example: * without the patch: kcapi -x 2 -e -c "gcm(aes)" -p 89154d0d4129d322e4487bafaa4f6b46 -k c0ece3e63198af382b5603331cc23fa8 -i 7e489b83622e7228314d878d -a afcd7202d621e06ca53b70c2bdff7fb2 -l 16 -u -s 00000000000000000000000000000000f4a3eacfbdadd3b1a17117b1d67ffc1f1e21efbbc6d83724a8c296e3bb8cda0c * with the patch: kcapi -x 2 -e -c "gcm(aes)" -p 89154d0d4129d322e4487bafaa4f6b46 -k c0ece3e63198af382b5603331cc23fa8 -i 7e489b83622e7228314d878d -a afcd7202d621e06ca53b70c2bdff7fb2 -l 16 -u -s afcd7202d621e06ca53b70c2bdff7fb2f4a3eacfbdadd3b1a17117b1d67ffc1f1e21efbbc6d83724a8c296e3bb8cda0c Tests covering this functionality have been added to libkcapi. Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig2
1 files changed, 2 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index caa770e535a2..0a121f9ddf8e 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1753,6 +1753,8 @@ config CRYPTO_USER_API_AEAD
tristate "User-space interface for AEAD cipher algorithms"
depends on NET
select CRYPTO_AEAD
+ select CRYPTO_BLKCIPHER
+ select CRYPTO_NULL
select CRYPTO_USER_API
help
This option enables the user-spaces interface for AEAD